Fan coil units and air conditioning systems

Abstract

To provide an air conditioning technology capable of effectively utilizing well water even during a time zone when operation of an air conditioning system decreases, to realize further energy saving.SOLUTION: The present invention is an air conditioning system that uses well water, the air conditioning system comprising: a first water pump that sends well water from a well; first air conditioning means that air-conditions a space to be air-conditioned by exchanging heat with well water sent by the first water pump; a heat storage tank that stores well water sent by the first water pump; a second water pump that sends well water stored in the heat storage tank; and second air conditioning means that air-conditions a space to be air-conditioned by exchanging heat with well water sent by the second water pump.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an air conditioning system. [Background technology]

[0002] Techniques for utilizing well water in air conditioning systems have been disclosed (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-80252 [Patent Document 2] Patent No. 6444747 Summary of the Invention [Problem to be solved by the invention]

[0004] When an air conditioning system uses the heat of well water to adjust the temperature of the air supplied to the space to be air-conditioned, it is thought that energy savings can be realized because the amount of heat produced is reduced. However, when using well water in an air conditioning system to save energy in this way, it is thought that the benefits of using well water will decrease during times when the operation of the air conditioning system is reduced.

[0005] Therefore, an object of the present application is to provide an air conditioning technology that effectively utilizes well water even during times when the operation of the air conditioning system is reduced, thereby achieving further energy savings. [Means for solving the problem]

[0006] In order to solve the above problem, the present invention utilizes well water pumped up from a well and well water pumped up from a well and temporarily stored in an air conditioning system.

[0007] In detail, the present invention is an air conditioning system that uses well water, and includes a first water supply pump that supplies well water from a well, a first air conditioning means that conditions the space to be air-conditioned by exchanging heat with the well water supplied by the first water supply pump, a heat storage tank that stores the well water supplied by the first water supply pump, a second water supply pump that supplies the well water stored in the heat storage tank, and a second air conditioning means that conditions the space to be air-conditioned by exchanging heat with the well water supplied by the second water supply pump.

[0008] In such an air conditioning system, well water is used as the heat medium for heat exchange with the first air conditioning means and the second air conditioning means, thereby reducing the amount of heat produced for heat exchange with the first air conditioning means and the second air conditioning means, thereby realizing energy savings.

[0009] Furthermore, when well water is stored in the heat storage tank during times when the air conditioning system is operating slowly, the well water stored in the heat storage tank absorbs cold or hot heat from the surrounding air. Therefore, if the air-conditioned space is located close to the heat storage tank, the temperature of the air-conditioned space can be adjusted. Therefore, well water can be effectively used even during times when the air-conditioning system is operating slowly.

[0010] The well water stored in the heat storage tank is heat exchanged with the second air conditioning means, which then uses the water to condition the space to be air-conditioned. This air conditioning system is an efficient system that achieves energy savings and makes full use of the well water without waste.

[0011] In addition, the amount of well water pumped is thought to be regulated to prevent land subsidence. Therefore, the amount of well water pumped from the well may be limited. Therefore, in an air conditioning system that does not have a thermal storage tank and uses well water directly pumped from the well to absorb the heat emitted from the air-conditioned space, it is possible that the well water may not be able to absorb the heat as desired. However, in the case of an air conditioning system such as the one described above, the well water stored in the thermal storage tank at night can be used to absorb the heat emitted from the air-conditioned space during the day. In other words, even if the amount of well water pumped is restricted and a large amount of heat is generated from the air-conditioned space during the day, the air conditioning system described above is a system that can respond to such situations and air-condition the air-conditioned space as desired.

[0012] The first air conditioning means may also include a first heat exchanger that exchanges heat between at least a portion of the well water supplied by the first water supply pump and a first heat medium, a first air supply means that supplies air that has exchanged heat with the first heat medium to the space to be air-conditioned, and a first circulation pump that pressurizes and circulates the first heat medium between the first heat exchanger and the first air supply means.

[0013] According to such an air conditioning system, well water is used to supply temperature-controlled air to a space to be air-conditioned.

[0014] In addition, the first water supply pump may operate in two water supply modes, a first water supply mode and a second water supply mode, and in the first water supply mode, the amount of well water supplied may be adjusted so that the outlet temperature of the first heat medium in the first heat exchanger becomes a predetermined temperature, and in the second water supply mode, the amount of well water supplied may be adjusted so that the amount of water stored in the heat storage tank becomes a predetermined amount.

[0015] According to this air conditioning system, in the first water supply mode, well water is used to supply temperature-controlled air to the space to be air-conditioned. In the second water supply mode, the degree to which the well water stored in the heat storage tank absorbs cold or hot air from the atmosphere surrounding the heat storage tank can be adjusted according to the environment.

[0016] The first air supply means may also include an outdoor air treatment machine that dehumidifies the outdoor air by exchanging heat between the first heat medium and the outdoor air and then supplies the dehumidified air to the space to be air-conditioned, and the first circulation pump may adjust the amount of the first heat medium circulated to the outdoor air treatment machine based on the enthalpy of the outdoor air drawn in by the outdoor air treatment machine and the state of the exhaust air discharged from the outdoor air treatment machine after heat exchange with the drawn in outdoor air.

[0017] In this air conditioning system, when the first circulation pump adjusts the amount of the first heat medium so that the outdoor air treatment unit can remove the latent heat from the outdoor air, the outdoor air treatment unit supplies dehumidified cool air. Furthermore, if the second air conditioning unit is an air supply unit other than the outdoor air treatment unit and includes an air supply unit that generates cool air by removing sensible heat from the air, the sensible heat treatment and latent heat treatment can be performed separately when generating cool air. In this case, it is not a problem if the temperature of the heat medium used in the air supply unit that performs sensible heat treatment is higher than the temperature of the heat medium used in the air supply unit that performs latent heat treatment. In other words, well water pumped directly from a well can be used as the cold water that exchanges heat with the heat medium of the air supply unit that performs latent heat treatment, and high-temperature well water that has stored warm water can be used as the cold water that exchanges heat with the heat medium of the air supply unit that performs sensible heat treatment. This air conditioning system is an efficient system that utilizes well water without waste.

[0018] Furthermore, as mentioned above, there is a possibility that the amount of well water pumped from a well may be limited. The temperature of such well water pumped from a well and delivered as is is lower than the temperature of well water stored in storage and storing heat. However, with the air conditioning system described above, such low-temperature well water with limited volume is preferentially used for the outdoor air treatment unit that performs latent heat treatment. In other words, even if the amount of well water pumped from a well is restricted, latent heat treatment can be performed as desired. Therefore, the space to be air-conditioned can be air-conditioned as desired.

[0019] The first air supply means may include a plurality of loads that individually supply air to respective locations within the space to be air-conditioned, and the second air conditioning means may have means for uniformly adjusting the temperature throughout the space to be air-conditioned.

[0020] Such an air conditioning system not only uniformly adjusts the temperature of the air-conditioned space, but also individually adjusts the temperature of each location within the air-conditioned space. Furthermore, such an air conditioning system utilizes well water pumped from a well and directly delivered to the first air supply means, which allows for individual temperature adjustment. Meanwhile, the second air conditioning means, which has a means for uniformly adjusting the temperature throughout the air-conditioned space, utilizes well water stored in a heat storage tank. In other words, such an air conditioning system can uniformly adjust the temperature throughout the air-conditioned space by exchanging heat with the air-conditioned space at night and then reusing the well water during the day. Furthermore, it is possible to adjust the temperature in each location within the air-conditioned space to meet the individual needs of users in each location. In other words, such an air conditioning system can meet the needs of each individual user while being economical.

[0021] Furthermore, as mentioned above, there is a possibility that the amount of well water pumped from a well may be limited. The temperature of such well water pumped from a well and delivered as is is lower than the temperature of well water stored in storage and storing heat. However, with the air conditioning system described above, such low-temperature, limited-volume well water is preferentially used for the first air supply means, which can individually adjust the temperature of the air-conditioned space. In other words, even if the amount of well water pumped from a well is restricted, individual user demand can be met.

[0022] The first circulation pump may adjust the amount of the first heat medium circulated to the plurality of loads based on the number of operating loads.

[0023] According to such an air conditioning system, the amount of the circulating first heat medium that is wasted is reduced.

[0024] Furthermore, at least some of the multiple loads may be installed in the ceiling of the air-conditioned space or on a desk placed in the air-conditioned space, and air may be supplied toward the air-conditioned space.

[0025] With such an air conditioning system, temperature-controlled air is supplied to a user using a desk on which a load is installed. Furthermore, if a user is located under the ceiling on which the load is installed, temperature-controlled air is supplied toward the user. Furthermore, if there are multiple desks on which loads are installed, or if there are multiple loads installed in the ceiling, the temperature of each location in the air-conditioned space located in the air supply direction of each load is suitably controlled. Therefore, if there are users in each location and the users themselves can adjust the supply air temperature, user comfort is improved compared to when the air-conditioned space is uniformly air-conditioned by a single air supply means.

[0026] In addition, at least some of the multiple loads installed in the ceiling of the space to be air-conditioned may include a fan coil unit, and the fan coil unit may have a fan that blows air toward the space to be air-conditioned, a coil that is positioned on the side of the fan toward the space to be air-conditioned and through which passes a first heat medium that exchanges heat with the air blown out from the fan, and a plate-like member that is positioned between the fan and the coil and has a plate surface that is positioned so as to block the air blown out from the fan.

[0027] In this type of air conditioning system, the plate-like member can absorb the operating noise of the fan. This improves the comfort felt by users in the air-conditioned space. Furthermore, the air blown out from the fan strikes the plate surface of the plate-like member, passes laterally through the plate surface, and heads toward the coil. This means that the air flowing toward the coil is rectified, allowing the air to exchange heat uniformly in the coil. This improves the efficiency of heat exchange in the coil.

[0028] The second air conditioning means also has a second heat exchanger that exchanges heat between the well water supplied by the second water supply pump and the second heat medium, and a second circulation pump that pressurizes and circulates the second heat medium between the second heat exchanger and the second air conditioning means, and the second water supply pump may adjust the amount of well water supplied so that the outlet temperature of the second heat medium in the second heat exchanger becomes a predetermined temperature.

[0029] According to this type of air conditioning system, when the heat storage tank is installed in a location close to the space to be air-conditioned, the hot or cold heat emitted from the space to be air-conditioned can be stored and the temperature of the space to be air-conditioned can be adjusted. Also, the well water stored in the heat storage tank can be reused for the second air-conditioning means. In other words, this type of air conditioning system is an efficient system that uses well water without waste.

[0030] The second air conditioning means may also include a heat radiating means for exchanging heat with the second heat medium and radiating heat to the air-conditioned space. In this air conditioning system, when well water stores heat in the heat storage tank, the heated well water exchanges heat with the second heat medium in the second heat exchanger. Therefore, the temperature of the second heat medium flowing into the heat radiating means is higher than the temperature of the first heat medium flowing into the first air conditioning means. However, since the heat radiating means removes sensible heat from the air-conditioned space by radiating heat, the air-conditioned space can be cooled using the second heat medium with a higher temperature. In other words, this air conditioning system is an efficient system that utilizes well water without waste. Furthermore, this air conditioning system adjusts the temperature of the air-conditioned space using the heat radiating means in addition to the first air supply means, thereby increasing the air-conditioning effect.

[0031] The heat storage tank may also be installed under the floor of the space to be air-conditioned. According to such an air conditioning system, the well water stored in the heat storage tank absorbs heat or cold from the space to be air-conditioned and stores it. This makes it possible to regulate the temperature of the space to be air-conditioned. Furthermore, the well water stored in the heat storage tank is used for the second air conditioning means. In other words, such an air conditioning system has a large air conditioning effect and is an efficient system that uses well water without waste. [Effects of the Invention]

[0032] According to the present invention, it is possible to provide an air conditioning technology that effectively utilizes well water even during times when the operation of the air conditioning system is reduced, thereby achieving further energy savings. [Brief explanation of the drawings]

[0033] [Figure 1] FIG. 1 shows an example of an outline of the configuration of an air conditioning system according to an embodiment. [Figure 2] FIG. 2 shows an example of an outline of the configuration of an air conditioning system according to an embodiment. [Figure 3] FIG. 3 shows an example of an outline of the configuration of an air conditioning system according to an embodiment. [Figure 4] 4A and 4B are schematic diagrams illustrating an example of an outline of a DCFCU. (A) shows an example of a longitudinal cross-section of the outline of a DCFCU. (B) shows an example of a transverse cross-section of the outline of a DCFCU. [Figure 5] Figure 5 shows examples of variations in the shape of holes provided in the face panel. (A) shows an example in which a swirler-shaped member is placed in the hole. (B) shows an example in which the face panel is made of punched metal. (C) shows an example in which multiple circular holes are provided in the face panel. [Figure 6] Figure 6 shows an example of a desk with a DCFCU retrofitted. (A) shows an example of a top view of the desk. (B) shows an example of a cross-sectional view of the desk. [Figure 7] FIG. 7 shows an overview of a DCFCU according to a first modified example. [Figure 8] FIG. 8 shows an overview of a DCFCU according to a second modification. [Figure 9] FIG. 9 shows an example of an outline of an outside air processing machine. [Figure 10] FIG. 10 shows an example of a schematic diagram of a radiating panel unit. [Figure 11] FIG. 11 shows an example of an outline of an outside air processing machine. [Figure 12] FIG. 12 shows an example of an outline of the arrangement of the air supply means in the space to be air conditioned. [Figure 13] FIG. 13 shows an example of an outline of the arrangement of the air supply means in the space to be air conditioned. [Figure 14]FIG. 14 shows an example of an outline of the arrangement of the air supply means in the space to be air conditioned. [Figure 15] FIG. 15 shows an example of an outline of how the air supply means is arranged in the space to be air conditioned. [Figure 16] FIG. 16 shows an example of a flowchart of the operation of the DCFCU. [Figure 17] FIG. 17 shows an example of the intake air flow overview when the DCFCU is operating. DETAILED DESCRIPTION OF THE INVENTION

[0034] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes embodiments of the present invention. The embodiments described below are merely examples of the present invention, and the technical scope of the present invention is not limited to the following aspects.

[0035] (System Overview) 1 to 3 show an example of the outline of the configuration of an air conditioning system 1 according to this embodiment. In the following description, the air conditioning system 1 is assumed to supply, for example, cold air to a plurality of spaces to be air-conditioned. The air conditioning system 1 is equipped with a plurality of air supply means for supplying cold air to the spaces to be air-conditioned. As shown in FIG. 1, the air conditioning system 1 is equipped with a well water pump 2 that pumps up well water from a well, and uses the well water as a heat medium for heat exchange with the cold water used to generate cold air in each air supply means.

[0036] Here, the air conditioning system 1 includes, as an example of a plurality of air supply devices, a DC fan coil unit (hereinafter referred to as DCFCU) 20 that is installed in the ceiling of the air-conditioned space and supplies cool air toward the air-conditioned space. Here, the DCFCU 20 conditions the entire air-conditioned space to a uniform temperature. The air conditioning system 1 also includes, as an example of a plurality of air supply devices, a desk 30 that is placed in the air-conditioned space and to which a DCFCU 20A of the same type as the DCFCU 20 is attached. The air conditioning system 1 also includes, as an example of a plurality of air supply devices, a DCFCU 20B (of the same type as the DCFCU 20) that is installed in the ceiling of the air-conditioned space and supplies cool air individually to each location in the air-conditioned space and adjusts the temperature of each location in the air-conditioned space. The air conditioning system 1 also includes, as an example of a plurality of air supply devices, a radiant panel unit 40 that is installed in the ceiling of the air-conditioned space and radiates heat toward the air-conditioned space. The air conditioning system 1 also includes, as an example of a plurality of air supply means, an outside air processing machine 60 and an outside air processing machine 80 that draw in outside air and supply cool air to the space to be air-conditioned.

[0037] (Explanation of each air supply method) <dcfcu20> FIG. 4 schematically illustrates an example of the outline of the DCFCU 20. FIG. 4(A) shows an example of a longitudinal cross-section of the outline of the DCFCU 20. FIG. 4(B) shows an example of a lateral cross-section of the outline of the DCFCU 20. As shown in FIG. 4, the DCFCU 20 includes a fan 201 that draws in and blows out air. Here, the fan 201 is a DC fan whose blades are driven by a direct current. The fan 201 blows out air in a direction laterally relative to the direction toward the space to be air-conditioned. Two fans 201 are provided side by side in the longitudinal direction.

[0038] The DCFCU 20 also includes a coil 203 on the side of the fan 201 facing the space to be air-conditioned, with a predetermined space between the fan 201 and the coil 203. The coil 203 includes a coil 203a, as shown in FIG. The well water passes through the coil 203 so that the well water flows through the coil 203. The coil 203 exchanges heat with the air blown out from the fan, and removes the sensible heat contained in the blown air. In other words, the coil 203 is a dry coil. The predetermined space between the fan 201 and the coil 203 is called an upper chamber 209.

[0039] The DCFCU 20 also includes a baffle plate 202 in the upper chamber 209. The baffle plate 202 is installed at the outlet of each fan 201 so that its plate surface faces the fan 201. In other words, the air blown out from the fan 201 is rectified by the baffle plate 202 and directed toward the coil 203.

[0040] The DCFCU 20 also includes a face panel 204 with a predetermined space between it and the coil 203, on the side of the space to be air-conditioned. The face panel 204 also includes holes 205 through which the cool air that exchanges heat with the coil 203 and passes through gaps between the members that form the coil 203 passes toward the space to be air-conditioned. The predetermined space between the coil 203 and the face panel 204 is defined as a lower chamber 213.

[0041] FIG. 5 shows an example of variations in the shape of the holes 205 provided in the face panel 204. FIG. 5(A) shows an example in which multiple wing-shaped members 214 are arranged in a swirling manner in the holes 205, and cool air is blown out from the gaps between the swirling wing-shaped members 214. FIG. 5(B) shows an example in which the face panel 204 is made of punched metal. FIG. 5(C) shows an example in which multiple circular holes are provided in the face panel 204. When the holes 205 are shaped as shown in FIG. 5(A), the air blown out from the holes 205 is sent to the air-conditioned space in a swirling manner, thereby suppressing the draft felt by people in the air-conditioned space. This improves the comfort felt by people in the air-conditioned space. Furthermore, when the holes 205 are shaped as shown in FIG. 5(B), cool air is supplied uniformly from the entire surface of the face panel 204. Furthermore, when the holes 205 have the shape shown in FIG. 5(C), a large amount of cool air can be supplied to the space to be air-conditioned.

[0042] 4, the DCFCU 20 also includes a hook 206 that hooks the face panel 204 onto the main body of the DCFCU 20. The DCFCU 20 also includes an open catch 207 that is installed on the main body of the DCFCU 20 and secures the face panel 204 to the main body of the DCFCU 20. The open catch 207 includes a magnet that attaches and secures the face panel 204, and has a mechanism that causes the part where the magnet is attached to pop out toward the target air-conditioned space when the user pushes the part where the open catch 207 is attached toward the ceiling from the target air-conditioned space side and then releases the hand. In other words, a user can push the part of the face panel 204 where the open catch 207 is attached toward the ceiling from the target air-conditioned space side and then release the hand, causing the part to open slightly toward the target air-conditioned space from the ceiling. The user can then insert their hand into the open gap and pull the face panel 204 toward the target air-conditioned space side to separate it from the open catch 207. Thereafter, the user can easily remove the face panel 204 from the installation location by removing the claws 206 from the main body of the DCFCU 20. The DCFCU 20 also includes a fall prevention wire 208 that connects the ceiling space to the face panel 204 and prevents the face panel 204 from falling into the space to be air-conditioned. In other words, the face panel 204 can be easily replaced.

[0043] The DCFCU 20 also includes a substrate 210. A control chip 211 is mounted on the mounting surface of the substrate 210. The control chip 211 is electrically connected to the fan 201 and controls the operation of the fan 201. The mounting surface of the substrate 210 also includes a wireless module 212 that can communicate wirelessly with an external terminal.

[0044] <Desk 30> FIG. 6 shows an example of an outline of a desk 30 to which a DCFCU 20A has been retrofitted. 6(A) shows an example of a schematic top view of the desk 30. FIG. 6(B) shows an example of a schematic cross-sectional view of the desk 30.

[0045] 6, the DCFCU 20A is attached to the underside of the top board 31 of the desk 30. The DCFCU 20A includes a duct 302. The duct 302 is provided with holes through which screws pass, and the duct 302 is fixed by engaging the screws that pass through the holes with holes provided at predetermined positions on the underside of the top board 31 of the desk 30.

[0046] The DCFCU 20A also includes two fans 303. As shown in Fig. 6, the duct 302 includes a housing portion 304 that houses the fans 303. The fans 303 are installed side by side in the horizontal direction of the desk 30 so that air is blown out toward the rear surface of the top board 31. The fans 303 may also be so-called DC fans in which blades provided on the fans 303 rotate when a direct current is applied to a motor provided inside the fans 303.

[0047] The DCFCU 20A also has an intake port 341 in the housing 304 that draws in air from the outside when the fan 303 operates. The intake port 341 is provided in the housing 304 below the fan 303. When the DCFCU 20A is later attached to the underside of the top panel 31 of the desk 30, the intake port 341 is located on the back panel 32 side of the desk 30. By providing the intake port 341 and the fan 303 in this manner, the housing 304 can be made thin while having a simple structure. Furthermore, by installing the fans 303 side by side in the horizontal direction, the thickness of the housing 304 can be made thin while increasing the amount of air blown out.

[0048] The DCFCU 20A also includes a coil 307. The coil 307 is plate-shaped and formed from a flow tube member 371 that meanders in a plane. An inlet 373 through which cold water flows is provided at the end of the flow tube member 371 that forms the lower part of the coil 307 (the part located near the bottom surface of the accommodation section 304 in FIG. 6(B)). An outlet 374 through which cold water flows out after passing through the flow tube member 371 is provided at the end of the flow tube member 371 that forms the upper part of the coil 307. In other words, the cold water exchanges heat with the air blown out from the fan 303 via the flow tube member 371. The coil 307 is installed facing up so that an outer surface 372 of the flow tube member 371 that meanders in a plane faces the direction in which the fan 303 is installed. In other words, the coil 307 is not installed upright relative to a horizontal surface to exchange heat with the air blown out from the fan 303. This allows the accommodation section 304 to be made thinner.

[0049] Duct 302 of DCFCU 20A also includes rectangular duct 305 through which air blown from fan 303 and passing through gaps between flow tube members 371 of coil 307 passes on its way toward a seated person. Housing 304 and duct 305 are in communication. Conduit 305 has a bottom that is stepped relative to the bottom surface of housing 304 toward the back surface of top board 31 of desk 30. Duct 302 also includes inclined surface 306 at the stepped portion.

[0050] DCFCU20A also has a blowout face 319 at the bottom of the end of desk 30 on the side of duct 305 where the seated person sits. Blowing face 319 has air inlet 320 with multiple small holes arranged horizontally. The blown air that has passed through duct 305 is supplied to the seated person through air inlet 320. Here, blowout face 319 is installed at an angle with respect to the horizontal plane, and the air blown out from air inlet 320 travels diagonally upward toward the upper body of the seated person.

[0051] The DCFCU 20A also includes a circuit board 310. The circuit board 310 has a mounting surface on which the fan 3 03 and is mounted with a control chip 311 that controls the operation of the fan 303. The mounting surface of the substrate 310 is also provided with a wireless module 312 that can communicate wirelessly with an external terminal.

[0052] Regarding the dimensions of each part of duct 302, the length of duct 305 in the depth direction as seen from a seated occupant is, for example, about 380 mm. The thickness of duct 305 is, for example, about 20 mm. The total length of accommodation section 304 and the step portion where accommodation section 304 and duct 305 communicate with each other in the depth direction as seen from a seated occupant is, for example, about 270 mm. The thickness of accommodation section 304 is, for example, about 80 mm. The vertical length of air intake port 320 provided in blow-out face 319 is, for example, about 5 mm.

[0053] 7 shows a modified DCFCU20AA. As shown in FIG. 7, the DCFCU20AA is a device that does not include a conduit 305 and has a reduced depth of, for example, about 300 mm (its thickness is, for example, about 80 mm, similar to the DCFCU20A). When such a DCFCU20AA is retrofitted to a desk 30A that has a reinforcing member 33 on the underside of the top panel 31, the DCFCU20AA can avoid the reinforcing member 33.

[0054] DCFCU20AA also has air intake port 320A, which has multiple small holes arranged horizontally, at the top of the seating-side side of accommodation section 304A, similar to air intake port 320. That is, air that passes through the gaps between flow tube members 371A of coil 307A is supplied to the seated occupant through air intake port 320A (details will be described later). Furthermore, the air blown out from air intake port 320A travels diagonally upward toward the upper body of the seated occupant.

[0055] The DCFCU 20AA also includes a guide 321 inside the housing 304A near the air inlet 320A. The guide 321 guides air that has passed through the gaps between the flow tube members 371A of the coil 307A to the air inlet 320A. Although not shown, the guide 321 includes a pivoting portion at the connection point with the housing 304A, allowing it to rotate around the horizontal direction of the desk 30A as the axis of rotation. In other words, by changing the orientation of the guide 321, the DCFCU 20AA adjusts the direction and amount of air that has passed through the gaps between the flow tube members 371A of the coil 307A and flows into the air inlet 320A. This also adjusts the direction and amount of air blown out from the air inlet 320A. The DCFCU 20AA also includes an inclined surface 306A on the seating side of the housing 304A.

[0056] Such a DCFCU20AA can achieve the same effects as those of the DCFCU20A shown in Fig. 6 (described later). In addition, even for a desk 30A equipped with a reinforcing member 33, the DCFCU20AA can be easily installed on the desk 30A without changing the dimensions of the conduit 305 to avoid the reinforcing member 33. Furthermore, according to such a DCFCU20AA, the side surface on the seating side of the accommodation portion 304A is provided with an inclined surface 306A, which prevents a part of the seated person's body from coming into contact with the accommodation portion 304A of the DCFCU20AA when the seated person sits down. In other words, such a DCFCU20AA can provide comfort to the seated person.

[0057] Furthermore, with such a DCFCU 20AA, the direction and amount of air blown out from the air supply port 320A can be adjusted by rotating the guide 321. In other words, such a DCFCU 20AA is a device that can flexibly respond to the needs of a seated occupant, such as the direction of the supply air, the amount of supply air, and the parts of the body that the supply air hits.

[0058] 8A and 8B show an example of the outline of a DCFCU 20AB according to another modification. FIG. 8A shows an example of the outline of a cross-sectional view of the DCFCU 20AB. FIG. 8B shows an example of a perspective view of the DCFCU 20AB. As shown in FIG. 8, the DCFCU 20A B is retrofitted to the desk 30A. That is, the reinforcing material 33 is positioned midway through the conduit 305B of the DCFCU 20AB. In the conduit 305B of the DCFCU 20AB retrofitted to such a desk 30A, the portion covering the reinforcing material 33 is formed by a flexible joint 308 made of fabric.

[0059] The DCFCU 20AB described above can achieve the same effects as those of the DCFCU 20A shown in FIG. 6 (described later). In addition, while maintaining the thinness of the duct 305B, the air vibrations that cause noise when the blades of the fan 303B rotate are absorbed by the flexible joint. This reduces leakage of the noise to the outside. Therefore, when a seated person sits, the degree to which the seated person perceives the noise of the fan 303B is reduced. This reduces the discomfort felt by the seated person due to the noise. Furthermore, because the flexible joint has cushioning properties, even if a part of the seated person's body comes into contact with the flexible joint, the discomfort felt by the seated person is reduced. In other words, the DCFCU 20AB described above can provide comfort to the seated person.

[0060] <Outside air processor 60> FIG. 9 shows an example of the outline of the outdoor air processor 60. As shown in FIG. 9, the outdoor air processor 60 includes a total heat exchanger 601 that exchanges heat between outdoor air and exhaust air from the space to be air-conditioned and dehumidifies the outdoor air. The outdoor air processor 60 also includes a heat exchanger 603 that exchanges heat with outdoor air that has passed through the total heat exchanger 601 and heats the outdoor air. Here, hot water is supplied to the inside of a coil forming the heat exchanger 603. The outdoor air processor 60 also includes a heat exchanger 604 that exchanges heat with indoor air drawn in from the space to be air-conditioned and cools the indoor air. Here, cold water that has exchanged heat with well water is supplied to the inside of a coil forming the heat exchanger 604. The outdoor air processor 60 also includes a rotor 602 that exchanges heat between the outdoor air that has passed through the heat exchanger 603 and been heated and the indoor air that has passed through the heat exchanger 604 and been cooled. As the outside air passes through the rotor 602, sensible heat is removed and the air is cooled. The portion of the rotor 602 that has had sensible heat removed from the outside air and that has been heated is rotated into a flow path through which indoor air passes. The heated portion then passes through the heat exchanger 604 and is cooled by the cooled indoor air. The heated portion is then rotated again into the flow path through which outside air passes, and sensible heat is removed from the outside air. The outside air processing unit 60 as described above is a device that removes sensible heat and latent heat from outside air.

[0061] The outdoor air processor 60 also includes a total heat exchanger 606 that exchanges heat between the outdoor air that has passed through the rotor 602 and cooled and the indoor air that has not yet passed through the heat exchanger 604. The outdoor air processor 60 also includes a fan 605 that blows the outdoor air that has passed through the total heat exchanger 606 into the space to be air-conditioned. In other words, the outdoor air is supplied to the space to be air-conditioned after being dehumidified and cooled by the outdoor air processor 60. The outdoor air processor 60 also includes a heat exchanger 608 that cools the heated indoor air that has passed through the rotor 602. Here, the coil that forms the heat exchanger 608 is supplied with cold water that has exchanged heat with well water. The outdoor air processor 60 also includes a fan 607 that discharges the indoor air that has passed through the heat exchanger 608 toward the total heat exchanger 601. In other words, the cooled indoor air flows into the total heat exchanger 601.

[0062] <Radiation Panel Unit 40> FIG. 10 shows an example of the outline of a radiant panel unit 40. The radiant panel unit 40 is installed above the ceiling of the space to be air-conditioned. The radiant panel unit 40 includes a flat coil 401 and a main pipe 402 through which cold water that has exchanged heat with well water passes. Three flat coils 401 are arranged in series in the plate surface direction. The radiant panel unit 40 also includes pipes 403 that branch off from the main pipe 402 and supply cold water to the three flat coils 401. The pipes 403 also connect the end of the flow tube that forms one coil 401 to the end of the flow tube that forms another coil 401 so that the flow tubes that form each coil 401 are arranged in series. Although not shown, the pipes 403 also include a flow control valve that adjusts the amount of cold water flowing inside the pipes 403. The flat coils 401 are provided with heat-radiating radiant panels 404 attached to the respective coils 401. That is, the radiant panels 404 exchange heat with the coils 401, and radiate cold heat in a cooled state. The radiant panel unit 40 is an example of the "heat radiating means" of the present invention.

[0063] <Outside air processing machine 80> FIG. 11 shows an example of the outline of the outdoor air processor 80. As shown in FIG. 11, the outdoor air processor 80 includes a total heat exchanger 801 that exchanges heat between outdoor air and exhaust air from the space to be air-conditioned and dehumidifies the outdoor air. The outdoor air processor 80 also includes a heat exchanger 802 that exchanges heat with outdoor air that has passed through the total heat exchanger 801 and cools the outdoor air. Here, cold water is supplied to the inside of a coil forming the heat exchanger 802. The outdoor air processor 80 also includes a heat exchanger 803 that exchanges heat with outdoor air that has passed through the heat exchanger 802 and reheats the outdoor air. Here, hot water is supplied to the inside of a coil forming the heat exchanger 803. The outdoor air processor 80 also includes a fan 804 that blows the outdoor air that has passed through the heat exchanger 803 into the space to be air-conditioned. The outdoor air processor 80 also includes a fan 805 that exhausts the indoor air that has passed through the total heat exchanger 801. That is, the outside air processing device 80 removes sensible heat and latent heat from the outside air.

[0064] (Overall system configuration) <Air supply method using well water directly> Next, an example of the overall configuration of the air conditioning system 1 formed from the above air supply means is shown. The air conditioning system 1 includes a pumping water tank 3. The pumping water tank 3 temporarily stores well water pumped up by a well water pumping pump 2. The well water pumping pump 2 also adjusts the amount of well water pumped up from the well depending on the water level in the pumping water tank 3.

[0065] The air conditioning system 1 also includes a well water supply pump 4. The well water supply pump 4 pumps well water stored in the pumped water tank 3. Here, the well water supply pump 4 adjusts the amount of well water to be pumped depending on the set mode.

[0066] The air conditioning system 1 also includes a heat exchanger 5. At least a portion of the well water sent from the well water supply pump 4 flows into the primary side of the heat exchanger 5. The air conditioning system 1 also includes a valve 6 that adjusts the amount of well water sent from the well water supply pump 4 to the heat exchanger 5. Here, the heat exchanger 5 is an example of the "first heat exchanger" of the present invention.

[0067] Meanwhile, on the secondary side of the heat exchanger 5, a circulation pipe is provided through which chilled water circulates between the heat exchanger 5 and a coil 203B of a DCFCU20B, which is a fan coil unit of the same type as the DCFCU20 and is installed above the ceiling of the space to be air-conditioned. That is, in the heat exchanger 5, heat is exchanged between well water supplied directly from a well and chilled water that exchanges heat with air to generate chilled air in the DCFCU20B. Here, the chilled water flowing in the circulation pipe on the secondary side of the heat exchanger 5 is an example of the "first heat medium" of the present invention.

[0068] Furthermore, on the secondary side of the heat exchanger 5, a circulation pipe is provided through which chilled water circulates between the heat exchanger 5 and a flow pipe member 371 that forms the coil 307 of the DCFCU 20A that is retrofitted to the desk 30. In other words, in the heat exchanger 5, well water supplied directly from the well exchanges heat with chilled water that exchanges heat with air to generate chilled air in the DCFCU 20A.

[0069] Furthermore, on the secondary side of the heat exchanger 5, a circulation pipe is provided through which cold water circulates between the heat exchangers 604, 608 provided in the outdoor air processor 60 and the heat exchanger 5. In other words, in the heat exchanger 5, well water supplied directly from the well exchanges heat with the cold water flowing through the heat exchangers 604, 608 of the outdoor air processor 60.

[0070] The air conditioning system 1 also includes a direct supply system secondary pump 21 that supplies the chilled water flowing through the coil 203B of the DCFCU20B, the chilled water flowing through the coil 307 of the DCFCU20A retrofitted to the desk 30, and the chilled water flowing through the heat exchangers 604 and 608 provided in the outdoor air treatment unit 60 to the secondary side of the heat exchanger 5.

[0071] The air conditioning system 1 also includes air-cooled chillers 70A and 70B and a heat exchanger 22. The heat exchanger 22 further exchanges heat in the water that has been sent from the direct supply secondary pump 21 to the heat exchanger 5 and has been heat exchanged in the heat exchanger 5. The cold water supplied to the primary side of the heat exchanger 5 is generated by the air-cooled chillers 70A and 70B. The air conditioning system 1 also includes a pump 23 that returns the secondary-side water that has been heat exchanged in the heat exchanger 22 to the coil 203B of the DCFCU 20B, the coil 307 of the DCFCU 20A that is retrofitted to the desk 30, and the heat exchangers 604 and 608 that are provided in the outdoor air processor 60. The DCFCU 20B, the desk 30 (DCFCU 20A), the outdoor air processor 60, the direct supply secondary pump 21, and the pump 23 are examples of the "first air conditioning means" of the present invention. The DCFCU 20B, the desk 30 (DCFCU 20A), and the outside air processing machine 60 are an example of the "first air supply means" of the present invention. The air-cooled chillers 70A and 70B are an example of the "chilled or hot water supply device" of the present invention.

[0072] <Air supply method using stored and heat-accumulated well water> The air conditioning system 1 also includes a water tank 10. The water tank 10 is installed, for example, under the floor of the space to be air-conditioned. At least a portion of the well water delivered from the well water supply pump 4 flows into the water tank 10 and is stored therein. The water tank 10 also includes a heat storage tank 11 that stores the well water for a predetermined period of time to store heat, and a return water tank 12 that stores the well water for return to the return well. The well water delivered from the well water supply pump 4 flows into the heat storage tank 11. The well water stored in the heat storage tank 11 absorbs heat from the surrounding atmosphere and the return water tank 12 and stores it. The air conditioning system 1 also includes a valve 8 for adjusting the amount of inflow. The well water flowing into the return water tank 12 is delivered from the well water supply pump 4 to a heat exchanger 5, where the well water exchanges heat with secondary water and then flows into the return water tank 12. Here, the air conditioning system 1 includes a valve 7 that adjusts the amount of well water that flows from the heat exchanger 5 into the return water tank 12.

[0073] The air conditioning system 1 also includes a well water heat storage pump 13 that pumps up and delivers well water that has been stored and has stored heat in the heat storage tank 11. The air conditioning system 1 also includes a heat exchanger 14 into which the well water delivered from the well water heat storage pump 13 flows. Here, the well water delivered from the well water heat storage pump 13 flows into the primary side of the heat exchanger 14. Here, the heat exchanger 14 is an example of the "second heat exchanger" of the present invention.

[0074] The air conditioning system 1 also includes a valve 15 on the primary side of the heat exchanger 14 that adjusts the amount of well water returning from the heat exchanger 14 to the return water tank 12. The air conditioning system 1 also includes a valve 16 that adjusts the amount of well water returning to the return water tank 12 that is pumped up by the well water heat storage pumping pump 13 and mixed with the well water flowing from the heat storage tank 11 to the primary side of the heat exchanger 14.

[0075] Meanwhile, on the secondary side of the heat exchanger 14, a circulation pipe is provided through which cold water circulates between the heat exchanger 14 and the main pipe 402 of the radiant panel unit 40, which is installed above the ceiling of the space to be air-conditioned. In other words, in the heat exchanger 14, heat is exchanged between the well water that has been stored and heat-stored in the heat storage tank 11 and the cold water that cools the radiant panel 404 of the radiant panel unit 40. Here, the cold water flowing in the circulation pipe on the secondary side of the heat exchanger 14 is an example of the "second heat medium" of the present invention.

[0076] Furthermore, on the secondary side of the heat exchanger 14, a circulation pipe is provided through which cold water circulates between the coil 203 of the DCFCU 20, which is provided above the ceiling of the space to be air-conditioned, and the heat exchanger 14. That is, in the heat exchanger 14, well water that has been stored and heat-stored in the heat storage tank 11 and the The cold water exchanges heat with the air to generate cold air.

[0077] Furthermore, on the secondary side of the heat exchanger 14, a circulation pipe is provided for circulating cold water between the heat exchanger 802 of the outdoor air processor 80 that supplies air to the space to be air-conditioned and the heat exchanger 14. That is, in the heat exchanger 14, heat is exchanged between the well water that has been stored in the heat storage tank 11 and has stored heat, and the cold water that exchanges heat with the outdoor air to generate cold air in the heat exchanger 802 of the outdoor air processor 80.

[0078] The air conditioning system 1 also has the radiation panel unit 40, DCFCU 20, and outdoor air processor 80 arranged in parallel, with the chilled water flowing out from the secondary side of the heat exchanger 14 supplied to each device. The air conditioning system 1 also has an outdoor air processor 50 downstream of the radiation panel unit 40, DCFCU 20, and outdoor air processor 80. The outdoor air processor 50 may be, for example, an outdoor air processor manufactured by PMAC. The outdoor air processor 50 includes a heat exchanger (not shown), and chilled water flows into the coil of the heat exchanger. The chilled water then exchanges heat with the outdoor air in the heat exchanger, thereby cooling the outdoor air. The outdoor air processor 50 removes sensible heat from the outdoor air. The cooled outdoor air is then supplied to the space to be air-conditioned. The outdoor air processor 50 is an example of a "load that further exchanges heat with the second heat medium that has exchanged heat with the thermal radiation means" in the present invention.

[0079] The air conditioning system 1 also includes a heat storage secondary pump 41. The heat storage secondary pump 41 exchanges heat with air on the secondary side of the heat exchanger 14 to generate cold air in the radiant panel unit 40, the DCFCU 20, or the outdoor air processor 80, and sends the cold water that has exchanged heat with the air to generate cold air in the outdoor air processor 50 to the secondary side of the heat exchanger 14.

[0080] The air conditioning system 1 also includes a heat exchanger 42. The heat exchanger 42 further exchanges heat in the water that has been sent from the heat storage secondary pump 41 to the heat exchanger 14 and has been heat exchanged in the heat exchanger 14. The cold water supplied to the primary side of the heat exchanger 42 is generated by air-cooled chillers 70A and 70B. The air conditioning system 1 also includes a pump 43 that returns the secondary side water that has been heat exchanged in the heat exchanger 42 to the radiant panel unit 40, the DCFCU 20, and the outdoor air processor 80. The DCFCU 20, the radiant panel unit 40, the outdoor air processor 50, the outdoor air processor 80, the heat storage secondary pump 41, and the pump 43 are examples of the "second air conditioning means" of the present invention.

[0081] The air conditioning system 1 also includes a well water return pump 17. The well water return pump 17 sends well water stored in the heat storage tank 11 to the return well, thereby adjusting the starting water level of the water tank 10 so that drainage of the water tank 10 is completed by the time the well water is stored in the heat storage tank 11 and heat storage begins.

[0082] <Other components> The air conditioning system 1 also includes outdoor air processing units 80A and 80B of the same type as the outdoor air processing unit 80. The outdoor air processing unit 80A is installed in an air-conditioned space different from the air-conditioned space in which the above-mentioned air supply means is installed, for example. The different air-conditioned space may be, for example, a kitchen. The outdoor air processing unit 80A supplies air at a desired temperature and humidity to the kitchen. The outdoor air processing unit 80B is installed in another air-conditioned space, for example, on a different floor from the above-mentioned air-conditioned space, and supplies air at a desired temperature and humidity. Chilled water generated in air-cooled chillers 70A and 70B is supplied to heat exchangers 802A and 802B provided in the outdoor air processing units 80A and 80B, respectively.

[0083] The air conditioning system 1 also includes a hot water tank 90 and a heat exchanger 91. Hot water is stored in the hot water tank 90, and the stored hot water is supplied to the primary side of the heat exchanger 91. On the other hand, the secondary side of the heat exchanger 91 is connected to heat exchangers 803A and 803B provided in the outside air processing units 80A and 80B, respectively. A circulation pipe is provided between the hot water storage tank 90 and the heat exchanger 91. That is, in the heat exchanger 91, heat is exchanged between the hot water stored in the hot water storage tank 90 and the hot water that exchanges heat with the outside air to generate warm air in the heat exchangers 803A and 803B of the outside air processing machines 80A and 80B.

[0084] Furthermore, a circulation pipe is provided on the secondary side of the heat exchanger 91, through which hot water circulates between the heat exchanger 91 and a heat exchanger 603 provided in the outdoor air processing unit 60. That is, in the heat exchanger 91, heat exchange occurs between the hot water stored in the hot water storage tank 90 and the hot water that exchanges heat with the outdoor air in the heat exchanger 603 of the outdoor air processing unit 60 to heat the outdoor air.

[0085] The air conditioning system 1 also includes a hot water secondary pump 94. The hot water secondary pump 94 sends, on the secondary side of the heat exchanger 91, hot water that has been heat exchanged in the heat exchangers 803A and 803B provided in the outdoor air processors 80A and 80B, respectively, and in the heat exchanger 603 provided in the outdoor air processor 60.

[0086] The air conditioning system 1 also includes a pump 95 that returns the secondary water that has been heat exchanged in the heat exchanger 91 to the heat exchangers 803A and 803B provided in the outdoor air treatment units 80A and 80B, respectively, and to the heat exchanger 603 provided in the outdoor air treatment unit 60.

[0087] The air conditioning system 1 also includes generators 92A and 92B. Primary-side water that has undergone heat exchange in the heat exchanger 91 flows into the generators 92A and 92B. The air conditioning system 1 also includes generator exhaust heat circulation pumps 93A and 93B that send the primary-side water that has undergone heat exchange in the heat exchanger 91 to the generators 92A and 92B. The water that flows into the generators 92A and 92B absorbs the exhaust heat from the generators and is heated. The heated water is then sent to the hot water storage tank 90. ​​The air conditioning system 1 also includes a primary dryer 100. The generator exhaust heat circulation pumps 93A and 93B can be adjusted to send at least a portion of the primary-side water that has undergone heat exchange in the heat exchanger 91 to the primary dryer 100.

[0088] The air conditioning system 1 also includes a steam boiler 96, a heat exchanger 97, and a return water tank 98. Steam generated in the steam boiler 96 is supplied to the primary side of the heat exchanger 97. The steam that has undergone heat exchange in the heat exchanger 97 becomes water, which is stored in the return water tank 98 and then returned to the steam boiler 96. The air conditioning system 1 also includes a secondary pump 99 on the secondary side of the heat exchanger 97 that causes the water on the primary side that has undergone heat exchange in the heat exchanger 91 to flow into the heat exchanger 97.

[0089] (Example of arrangement of each air supply means) 12 to 15 show an example of the layout of the above air supply means in the space to be air-conditioned. In the air-conditioned space shown in FIG. 12, an outdoor air processing unit 60 is placed near the air-conditioned space. Cool air generated in the outdoor air processing unit 60 is supplied from the side of the air-conditioned space toward the air-conditioned space. In the air-conditioned space shown in FIG. 12, two DCFCUs 20 are placed in corners of the ceiling. Cool air generated in the DCFCUs 20 is supplied to the air-conditioned space. The air supply from the DCFCUs 20 has its direction, volume, and other factors adjusted so that the temperature throughout the air-conditioned space is uniform. In addition, an aquarium 10 is installed under the floor of the air-conditioned space shown in FIG. 12.

[0090] In the air-conditioned space shown in FIG. 13, multiple DCFCUs 20B are placed above the ceiling. Then, the cool air generated in the DCFCUs 20B is supplied separately from the ceiling of the air-conditioned space to each location in the air-conditioned space. Also, in the air-conditioned space shown in FIG. 13, multiple desks 30 are placed. Then, the cool air generated in the DCFCUs 20A attached to the desks 30 is supplied toward each seated person. Also, in the air-conditioned space shown in FIG. In the air-conditioned space, an outside air processor 80 is disposed near the air-conditioned space. Cool air generated in the outside air processor 80 is supplied from the ceiling of the air-conditioned space toward the air-conditioned space.

[0091] In the air-conditioned space shown in Fig. 14, a radiant panel unit 40 is placed on the ceiling. The cooled radiant panel 404 radiates heat toward the air-conditioned space. In the air-conditioned space shown in Fig. 14, a plurality of desks 30 are placed. Cool air generated in a DCFCU 20A attached to the desks 30 is supplied toward each seated occupant. In the air-conditioned space shown in Fig. 14, an outdoor air processor 80 is placed near the air-conditioned space. Cool air generated in the outdoor air processor 80 is supplied from the ceiling of the air-conditioned space toward the air-conditioned space.

[0092] In the air-conditioned space shown in Fig. 15, multiple desks 30 are placed. Cool air generated in a DCFCU 20A attached to the desks 30 is supplied toward each seated occupant. In the air-conditioned space shown in Fig. 15, an outdoor air processor 80 is placed near the air-conditioned space. The cool air generated in the outdoor air processor 80 is supplied from the ceiling of the air-conditioned space toward the air-conditioned space. In the air-conditioned space shown in Fig. 15, an outdoor air processor 50 is placed near the air-conditioned space. The cool air generated in the outdoor air processor 50 is supplied from the ceiling of the air-conditioned space toward the air-conditioned space.

[0093] (Example of daytime operation) <Well water supply pump 4> Next, an example of the operation of the air conditioning system 1 will be described. The air conditioning system 1 has two operating modes, for example, a daytime mode and a nighttime mode. In the daytime mode, the flow rate of well water pumped from a well and sent from the well water supply pump 4 to the primary side of the heat exchanger 5 is adjusted so that the secondary side outlet temperature A (FIG. 1) of the heat exchanger 5 reaches a set value (for example, approximately 17°C). Therefore, the well water sent from the well water supply pump 4 to the primary side of the heat exchanger 5 is, for example, 500 L / min. The primary side inlet temperature of the sent well water is, for example, approximately 16°C, and the primary side outlet temperature of the heat exchanger 5 is, for example, approximately 23°C. In addition, during the day, a valve 6 installed in the piping through which the well water supplied from the well water supply pump 4 to the heat exchanger 5 passes is opened. On the other hand, the valve 8 provided in the pipe through which well water passes from the well water supply pump 4 to the heat storage tank 11 is closed. The well water supply pump 4 is an example of the "first water supply pump" of the present invention. The daytime mode is an example of the "first water supply mode" of the present invention.

[0094] <Direct supply system secondary pump 21> In the daytime mode, the amount of chilled water circulated between the heat exchanger 5 and the air supply means on the secondary side of the heat exchanger 5 by the direct supply system secondary pump 21 arranged on the secondary side of the heat exchanger is set as follows. That is, for example, the amount of chilled water circulated between the heat exchanger 5 and the heat exchangers 604 and 608 of the outdoor air processor 60 is set based on the outdoor air enthalpy and the state of the outlet air C (FIG. 9) of the total heat exchanger 601. The amount of chilled water circulated between the heat exchanger 5 and each coil 203B forming the DCFCU 20B is set based on the number of operating DCFCUs 20B. The amount of chilled water circulated between the heat exchanger 5 and the coil 307 of the DCFCU 20A retrofitted to the desk 30 is set based on the number of desks 30. The total amount of chilled water set in this way is, for example, 500 L / min. The secondary-side inlet temperature of the chilled water of the heat exchanger 5 is, for example, about 24°C. The direct supply system secondary pump 21 is an example of the "first circulation pump" of the present invention.

[0095] <Outside air processor 60> The chilled water cooled in heat exchanger 5 is further cooled by heat exchange with chilled water produced in chillers 70A and 70B in heat exchanger 22. Then, at a temperature of, for example, about 17°C, it is supplied to heat exchangers 604 and 608 of the outside air processor 60. Then, in the outside air processor 60, latent heat is removed from the outside air. The dehumidified and cooled outside air is then supplied to the air-conditioned space shown in FIG.

[0096] The outdoor air treatment unit 60 can also supply a constant volume of cool air to the space to be air-conditioned. The outdoor air treatment unit 60 can also change the volume of air in stages depending on the usage status of the space to be air-conditioned. The supply air temperature can also be adjusted by adjusting the amount of cold water flowing through the heat exchangers 604 and 608 and the amount of hot water flowing through the heat exchanger 603. The outdoor air treatment unit 60 can also reset its settings depending on the indoor temperature of the space to be air-conditioned. The outdoor air treatment unit 60 can also adjust the supply air dew point temperature by adjusting the amount of cold water flowing through the heat exchangers 604 and 608 and the amount of hot water flowing through the heat exchanger 603.

[0097] <dcfcu20b> Furthermore, the chilled water cooled on the secondary side of heat exchanger 5 and further cooled by heat exchange with the chilled water produced in chillers 70A and 70B in heat exchanger 22 is also supplied to coil 203B forming DCFCU 20B. Here, DCFCU 20B is a fan coil unit of the same type as DCFCU 20 shown in FIG. 4. That is, air blown out from fan 201 is rectified by baffle plate 202 and directed toward coil 203 through which chilled water passes. The blown air is cooled as it passes over the surface of coil 203. The cooled air then passes through gaps between the members forming coil 203 and is supplied to the air-conditioned space through holes 205 provided in face panel 204. Here, DCFCU 20B individually supplies cooled air to each space in the air-conditioned space (FIG. 13).

[0098] <DCFCU20A retrofitted to desk 30> The chilled water cooled on the secondary side of heat exchanger 5 and further cooled by heat exchange with chilled water produced in chillers 70A and 70B in heat exchanger 22 is also supplied to coil 307 forming DCFCU 20A that is retrofitted to desk 30. Here, Fig. 16 shows an example of a flowchart of the operation of DCFCU 20A. Fig. 17 shows an example of an outline of the flow of supply air when DCFCU 20A is operating.

[0099] 16, in step S101, the wireless module 312 receives an operation request signal requesting operation of the DCFCU 20A from a terminal such as a smartphone owned by the seat occupant (S101). Then, in step S102, the wireless module 312 transfers the operation request signal to the control chip 311 (S102).

[0100] In step S103, the control chip 311 generates a control signal to rotate the blades of the fan 303 in accordance with the operation request signal. This causes the blades of the fan 303 to rotate. As the blades of the fan 303 rotate, air is drawn into the fan 303 from the space under the seated occupant's legs through the air inlet 341. As shown in FIG. 17 , the air is blown out from the air outlet 309 of the fan 303 in the direction of the seated occupant (S103). Here, cold water cooled on the secondary side of the heat exchanger 5 passes through the inside of the flow tube member 371 of the coil 307. The cold water flows into the flow tube member 371 from an inlet 373 provided at the end of the flow tube member 371, which forms the lower part of the coil 307. The cold water exchanges heat with the air blown out from the fan 303 and flows into the flow tube member 371, which forms the upper part of the coil 307. The cold water then flows out from outlet 374 provided at the end of flow tube member 371 that forms the upper part of coil 307. In other words, the temperature of the cold water flowing inside flow tube member 371 that forms the lower part of coil 307 is low, and the temperature of the cold water increases as it moves upward in coil 307.

[0101] Here, at least a portion of the air blown out from the fan 303 strikes the back surface of the top plate 31 and then travels along the outer surface 372 of the coil 307. Therefore, the blown air exchanges heat uniformly with the coil 307 and is cooled. In addition, the space in the direction of travel of the blown air is gradually blocked by the outer surface 372, so the flow of the blown air is smooth. Therefore, pressure loss of the blown air is suppressed. In addition, the cooled blown air passes through the gaps between the flow tube members 371.

[0102] The blown air that passes through the gaps between the flow pipe members 371 reaches a step portion where the accommodation section 304 and the duct 305 communicate with each other. Here, an inclined surface 306 is provided at the step portion. Therefore, the blown air that has reached the step portion flows naturally and efficiently along the inclined surface 306 into the inside of the duct 305. The blown air then passes through the duct 305 and is supplied to the seated occupant in the air-conditioned space shown in FIGS. 13 to 15 via the air supply port 320. Here, the DCFCU 20A may be provided with a rectifying member such as a louver at the air supply port 320, and the air supplied from the air supply port 320 may be adjusted so as to be concentrated on a specific part of the occupant's body, such as the neck.

[0103] Here, DCFCU20A is remotely controlled from a terminal such as a smartphone owned by the seat occupant, but DCFCU20B, which is installed in the ceiling, may also be remotely controlled from a terminal such as a smartphone owned by the seat occupant, just like DCFCU20A.

[0104] <Well water heat storage pump 13> The air conditioning system 1 not only uses well water by sending it directly to the heat exchanger 5 using the well water supply pump 4, but also uses well water that has been temporarily stored in the water tank 10 and has its temperature increased by heat storage. The amount of well water pumped from the heat storage tank 11 by the well water heat storage pump 13 and sent to the primary side of the heat exchanger 14 is adjusted so that the secondary side outlet temperature B (FIG. 1) of the heat exchanger 14 is a set value (e.g., approximately 19°C). When the secondary side outlet temperature of the heat exchanger 14 is set to this set value, the well water sent from the well water heat storage pump 13 to the primary side of the heat exchanger 14 is, for example, 330 L / min. In this case, the primary side inlet temperature of the sent well water is, for example, approximately 18°C, and the primary side outlet temperature of the well water is, for example, approximately 21°C. Here, the well water thermal storage pump 13 is an example of the "second water pump" of the present invention.

[0105] <Heat storage secondary pump 41> The amount of chilled water circulated by the thermal storage secondary pump 41 between the heat exchanger 14 and the secondary air supply means of the heat exchanger 14 is set as follows: That is, for example, the minimum flow rate of chilled water circulated between the heat exchanger 14 and the secondary air supply means of the heat exchanger 14 is set to the sum of a flow rate (e.g., 108 L / min) that is 60% of the minimum flow rate of chilled water (e.g., 180 L / min) required for the outdoor air processor 50 to operate and the minimum flow rate of chilled water required for the outdoor air processor 80 to operate. Then, variable flow rate control of the circulation flow rate is performed based on the control valve of the main piping 402 of the radiant panel unit 40 and the number of DCFCUs 20 in operation. Therefore, the amount of chilled water circulated by the thermal storage secondary pump 41 between the heat exchanger 14 and the secondary air supply means of the heat exchanger 14 is, for example, 380 L / min. The secondary side inlet temperature of the chilled water of the heat exchanger 14 is, for example, about 22°C. Here, the heat storage system secondary pump 41 is an example of the "second circulation pump" of the present invention.

[0106] <Radiation Panel Unit 40> At least a portion of the chilled water cooled on the secondary side of the heat exchanger 14 is further cooled by heat exchange with the chilled water generated in the chillers 70A and 70B in the heat exchanger 42. Then, the chilled water is supplied to the main pipe 402 provided in the radiant panel unit 40 at a temperature of, for example, about 19 degrees. Then, the chilled water is supplied to the pipe 403 branched from the main pipe 402. The air flows into the inside of the coil 401 via the radiant panel 404. Therefore, the radiant panel 404 attached to the coil 401 is cooled by exchanging heat with the coil 401. The cooled radiant panel 404 then radiates cold to the space to be air-conditioned. Here, the radiant panel unit 40 controls the opening of a valve provided in the piping 403 at intervals, thereby adjusting the temperature of the radiant panel 404 to between 19 degrees and 24 degrees, for example.

[0107] <dcfcu20> The chilled water cooled on the secondary side of heat exchanger 14 is further cooled by heat exchange with chilled water produced in chillers 70A and 70B in heat exchanger 42. The chilled water is then supplied to coil 203 forming DCFCU 20 when its temperature is, for example, about 19 degrees. Cool air is then supplied to the space to be air-conditioned shown in FIG.

[0108] <Outside air processing machine 80> The chilled water cooled on the secondary side of heat exchanger 14 is further cooled by heat exchange with chilled water produced in chillers 70A and 70B in heat exchanger 42. The chilled water is then supplied, for example at a temperature of about 19°C, to the inside of the coil of heat exchanger 802 provided in outside air processing unit 80. In other words, outside air passing through heat exchanger 802 is cooled and supplied to the space to be air-conditioned (FIGS. 13 to 15) by fan 804.

[0109] The outdoor air processor 80 can also supply a constant volume of cold air to the space to be air-conditioned. The supply air temperature can be adjusted by adjusting the amount of cold water flowing through the heat exchanger 802 and the amount of hot water flowing through the heat exchanger 803. The outdoor air processor 80 can also reset its settings according to the indoor temperature of the space to be air-conditioned. The outdoor air processor 80 can also adjust the supply air dew point temperature by adjusting the amount of cold water flowing through the heat exchanger 802 and the amount of hot water flowing through the heat exchanger 803.

[0110] <Outside air processor 50> In the above-described radiation panel unit 40, the cold water flowing inside the coil 401 that has exchanged heat with the radiation panel 404 reaches a temperature of, for example, about 22-23°C and flows out of the coil 401. The cold water that flows out of the radiation panel unit 40 is then supplied to the inside of the coil of the heat exchanger provided in the outdoor air processing unit 50. Therefore, the outdoor air drawn into the outdoor air processing unit 50 is cooled as it passes through the heat exchanger, and is supplied to the space to be air-conditioned shown in FIG.

[0111] <Other devices> The air-cooled chillers 70A, 70B also supply the chilled water they generate to heat exchangers 802A, 802B of the outdoor air processors 80A, 80B. The amount of chilled water supplied from the air-cooled chillers 70A, 70B to the heat exchangers 802A, 802B is determined based on the enthalpy of the outdoor air drawn into the outdoor air processors 80A, 80B. An outdoor air processor 80B may be disposed in each of a plurality of air-conditioned spaces. In this case, while the overall air supply volume of the outdoor air processor 80B is kept constant, the air supply volume may be varied for each air-conditioned space depending on the usage status of each air-conditioned space.

[0112] Furthermore, the generator exhaust heat circulation pumps 93A, 93B are operated to exchange heat on the primary side of the heat exchanger 91 and to keep the temperature D (FIG. 3) of the water returning to the generators 92A, 92B at 55° C. or lower. When the outlet temperature E (FIG. 2) on the primary side of the heat exchanger 91 is on the rise, part of the water returning to the generators 92A, 92B is sent to the primary dryer 100.

[0113] Furthermore, the steam boiler 96 is operated when the generators 92A and 92B are out of operation, for example, during maintenance or due to a malfunction. The steam generated in the steam boiler 96 is supplied to the primary side of the heat exchanger 97 via a pressure reducing device (a pressure reducing valve or a steam power generator). The steam then undergoes heat exchange in the heat exchanger 97 to become water, which flows out from an outlet on the primary side. The outflowing water is then returned to the return water tank 98. The amount of steam output from the steam boiler 96 is changed depending on the number of operating generators 92A, 92B. The secondary pump 99 may be controlled to a constant flow rate, and part of the returning water may be sent to the primary dryer 100 so that the return temperature F (FIG. 3) of the primary-side water that has been heat exchanged in the heat exchanger 91 when it returns to the heat exchanger 97 is 55°C or lower.

[0114] In addition, a starting water level is set in the water tank 10 at which the well water return pump 17 is started. The starting water level is set to a water level at which the drainage of the well water stored in the water tank 10 is completed by the time the well water is stored in the heat storage tank 11 and heat storage is started, for example.

[0115] The air conditioning system 1 may also include a VAV (Variable Air Volume) unit (not shown). The VAV unit may calculate the number of people in each air-conditioned space by collecting location information from smartphones carried by the people in each air-conditioned space. The VAV setting value may then be changed depending on the number of people in each room. The total amount of air supplied to the air-conditioned space in which the outdoor air processing unit 60 and the DCFCU 20 are installed may also be changed depending on an event being held in the space.

[0116] (Example of nighttime operation) <Well water supply pump 4> In the night mode, a valve 6 provided in a pipe through which well water passes when it is supplied from the well water supply pump 4 to the heat exchanger 5 is closed. On the other hand, a valve 8 provided in a pipe through which well water passes from the well water supply pump 4 toward the heat storage tank 11 is opened. The well water supply pump 4 then sends well water to the heat storage tank 11 until a set amount of well water is stored in the heat storage tank 11. The amount of well water stored in the heat storage tank 11 may be determined, for example, based on the weather (temperature, humidity forecast, etc.) for the next day. The heat storage tank 11 is installed under the floor of the air-conditioned space as shown in FIG. 12. Therefore, the well water stored in the heat storage tank 11 absorbs heat from the air-conditioned space during the night. In other words, the air-conditioned space shown in FIG. 12 is cooled by the well water stored in the heat storage tank 11 at least during the night. The night mode is an example of a "second water supply mode" of the present invention.

[0117] <Action and effect> According to the air conditioning system 1 described above, well water is supplied to the primary side of the heat exchanger 5 by the well water supply pump 4, and the well water is used to cool the water flowing into the secondary side of the heat exchanger 5. In other words, the water flowing into the secondary side of the heat exchanger 5 is used as a heat medium to generate cold air. Therefore, according to the air conditioning system 1 described above, the amount of heat produced for heat exchange with the cold water used by the DCFCU 20B, desk 30 (DCFCU 20A), and outdoor air processor 60 arranged on the secondary side of the heat exchanger 5 to generate cold air is reduced. This achieves energy savings.

[0118] Furthermore, according to the above-described air conditioning system 1, well water is stored in the water tank 10 at night when the operation of the air conditioning system 1 is reduced. The water tank 10 is installed under the floor of the space to be air-conditioned, as shown in FIG. 12. Therefore, the well water stored in the water tank 10 can absorb and store heat contained in the space to be air-conditioned. This makes it possible to regulate the temperature of the space to be air-conditioned. Therefore, the well water can be effectively used even at night when the operation of the air conditioning system is reduced.

[0119] The well water stored in the water tank 10 is supplied to the primary side of the heat exchanger 14 and is used to cool the water flowing into the secondary side of the heat exchanger 14. In other words, the water flowing into the secondary side of the heat exchanger 14 is used as a heat medium, and the well water is used to generate cool air. This type of air conditioning system is an efficient system that saves energy and uses well water without waste.

[0120] Furthermore, the amount of well water pumped may be restricted to prevent ground subsidence. In such cases, the amount of well water pumped by the well water pumping pump 2 is limited. Therefore, in an air conditioning system that does not include a water tank 10 and instead uses well water pumped directly from a well to absorb heat generated in the air-conditioned space, the well water may not be able to absorb the heat as desired. However, according to the air-conditioning system 1 described above, the well water stored in the water tank 10 at night is supplied to the primary side of the heat exchanger 14 during the day and used to cool the water flowing into the secondary side of the heat exchanger 14. In other words, according to the air-conditioning system 1 described above, even if the amount of well water pumped is restricted and a large amount of heat is generated in the air-conditioned space during the day, the system can respond to such a situation and air-condition the air-conditioned space as desired.

[0121] Furthermore, as mentioned above, there is a possibility that the amount of well water pumped by the well water pumping pump 2 may be limited. The temperature of well water pumped from such a well and delivered as is is lower than the temperature of well water stored in the thermal storage tank 11 and storing heat. However, with the air conditioning system 1 described above, such low-temperature, limited-volume well water is used preferentially for the outdoor air processing unit 60 that performs latent heat treatment, and the DCFCU 20B and desk 30 (DCFCU 20A) that individually supply cool air to the air-conditioned space, rather than for the DCFCU 20, radiant panel unit 40, and outdoor air processing unit 80 that uniformly adjust the temperature of the air-conditioned space. In other words, with the air conditioning system 1 described above, even when the amount of well water pumped from the well is restricted, latent heat treatment can be performed as desired, and the air-conditioned space can be air-conditioned as desired. Furthermore, the demands of individual users can be met.

[0122] Furthermore, the well water supplied to the primary side of the heat exchanger 14 is water that has stored heat in the water tank 10. Therefore, the heated well water exchanges heat with the water flowing into the secondary side in the heat exchanger 14. Therefore, the water flowing into the secondary side exchanges heat with the well water in the heat exchanger 14, and the temperature (approximately 19°C) flowing into the radiant panel unit 40, DCFCU 20, outdoor air processor 50, and outdoor air processor 80 becomes higher than the temperature (approximately 17°C) of the water that has exchanged heat with the well water in the heat exchanger 5 and flows into the DCFCU 20B, desk 30 (DCFCU 20A), and outdoor air processor 60. However, the radiant panel unit 40 removes sensible heat from the air-conditioned space by radiating heat, so this high-temperature water can be used to cool the air-conditioned space. Similarly, the DCFCU 20 can use this high-temperature water to remove sensible heat from the air-conditioned space. In other words, this air conditioning system is an efficient system that uses well water without waste.Furthermore, this air conditioning system can increase the air conditioning effect because it adjusts the temperature of the space to be air-conditioned not only by DCFCU20B, desk 30 (DCFCU20A), and outdoor air processor 60, which directly use well water, but also by radiant panel unit 40, DCFCU20, outdoor air processor 50, and outdoor air processor 80, which use heat-stored well water.

[0123] Furthermore, according to the above-described air conditioning system 1, the well water supply pump 4 adjusts the amount of well water supplied to the heat exchanger 5 in daytime mode so that the outlet temperature A on the secondary side of the heat exchanger 5 becomes a set value (for example, about 17 degrees). Therefore, the DCFCU 20B, desk 30 (DCFCU 20A), and outdoor air processor 60 arranged on the secondary side of the heat exchanger 5 can obtain chilled water of about 17 degrees by circulating water used to generate chilled air through the heat exchanger 5. Therefore, the DCFCU 20B, desk 30 (DCFCU 20A), and outdoor air processor 60 arranged on the secondary side of the heat exchanger 5 can generate chilled air to be supplied to the space to be air-conditioned.

[0124] Further, according to the air conditioning system 1, the direct supply system secondary pump 21 is connected to the heat exchanger 5, The amount of chilled water circulated between the outdoor air processor 60 and the direct supply secondary pump 21 is set based on the outdoor air enthalpy and the state of the outlet air C (FIG. 9) of the total heat exchanger 601. Therefore, the direct supply secondary pump 21 can supply chilled water at a temperature that allows latent heat to be removed from the outdoor air in the outdoor air processor 60. Therefore, in the air-conditioned space shown in FIG. 12, the DCFCU 20 removes sensible heat from the air-conditioned space, and the outdoor air processor 60 removes latent heat from the air-conditioned space.

[0125] Furthermore, according to the above air conditioning system 1, well water pumped directly from a well is used as the cold water that exchanges heat with the heat medium of the air supply means that performs latent heat treatment, such as the outside air treatment unit 60, and high-temperature well water that has been stored in the water tank 10 and has accumulated heat is used as the cold water that exchanges heat with the heat medium of the air supply means that performs sensible heat treatment, such as the radiant panel unit 40, separately from the latent heat treatment. Such an air conditioning system 1 is an efficient system that uses well water without waste.

[0126] Furthermore, according to the above-described air conditioning system 1, well water pumped directly from a well is used for the DCFCU 20B and desk 30 (DCFCU 20A), which individually supply cool air to each location and seated person in the air-conditioned space. Meanwhile, well water pumped from a well and temporarily stored in the heat storage tank 11 is used for the DCFCU 20 and radiant panel unit 40, which uniformly adjust the temperature in the air-conditioned space. In other words, according to the above-described air conditioning system 1, well water that stores heat by exchanging heat with the air-conditioned space at night is reused during the day to uniformly adjust the temperature in the air-conditioned space. Furthermore, well water pumped from a well and directly delivered to each location in the air-conditioned space can be used to adjust the temperature in each location according to the individual needs of users. In other words, the above-described air conditioning system 1 is an economical air conditioning system that can meet the needs of individual users.

[0127] Furthermore, in the air conditioning system described above, the chilled water flowing into the outdoor air processor 50 is chilled water that has passed through the radiant panel unit 40, the DCFCU 20, or the outdoor air processor 80. In other words, the outdoor air processor 50 reuses chilled water that has been used to generate chilled air in other devices to generate chilled air. Therefore, this air conditioning system is an efficient system that uses chilled water without waste. Furthermore, the outdoor air processor 50 increases the air conditioning effect of the space to be air-conditioned.

[0128] Furthermore, according to the above-described air conditioning system 1, four DCFCUs 20B are provided in the air-conditioned space in Fig. 13. The direct supply system secondary pump 21 sets the amount of chilled water circulated between the heat exchanger 5 and the DCFCUs 20B based on the number of operating DCFCUs 20B. Therefore, according to the above-described air conditioning system 1, air can be supplied from the DCFCUs 20B to each location in the air-conditioned space, and the amount of chilled water that is wasted is reduced.

[0129] Furthermore, according to the above-described air conditioning system 1, as shown in FIGS. 13 to 15, temperature-adjusted cool air is supplied to a user using a desk 30 on which a DCFCU 20A is installed. Furthermore, as shown in FIG. 13, multiple DCFCUs 20B are installed above the ceiling in the air-conditioned space, and thus suitable temperature-adjusted cool air is supplied to each user in the air-conditioned space. In other words, the temperature is adjusted appropriately for each location in the air-conditioned space. Furthermore, when multiple users are present in the air-conditioned space and each user can adjust the supply air temperature, user comfort is improved compared to when the air-conditioned space is uniformly air-conditioned by a single air supply unit.

[0130] Furthermore, in the DCFCU 20 forming the air conditioning system 1, the baffle plate 202 absorbs the operating noise of the fan 201. Therefore, the comfort felt by the user in the air-conditioned space is improved. Furthermore, the air blown out from the fan 201 hits the plate surface of the baffle plate 202, passes through the side of the plate surface, and heads toward the coil 203. In other words, the air heading toward the coil 203 is rectified, and heat is exchanged with the air uniformly in the coil 203. In other words, the efficiency of heat exchange in the coil 203 is improved.

[0131] Furthermore, according to the above-described air conditioning system 1, even if the secondary-side water that exchanges heat with well water in heat exchanger 5 or heat exchanger 14 is not adjusted to the desired temperature, the water can be adjusted to the desired temperature because it exchanges heat with chilled or hot water supplied from chillers 70A and 70B. Therefore, such air conditioning system 1 can suppress fluctuations in the temperature of the chilled water that flows out from the secondary side of heat exchanger 5 or the secondary side of heat exchanger 14 and is supplied to each air supply means that constitutes air conditioning system 1. Therefore, fluctuations in the temperature of the chilled air generated by each air supply means are suppressed. Therefore, chilled air with suppressed temperature fluctuations is supplied to the air-conditioned space, maintaining the comfort felt by the user in the air-conditioned space.

[0132] Furthermore, according to the above-described air conditioning system 1, the well water supply pump 4 adjusts the amount of well water sent to the water tank 10. Therefore, the well water stored in the water tank 10 absorbs heat from the surroundings of the water tank 10 (for example, the space to be air-conditioned shown in FIG. 12), and the degree of heat storage can be adjusted according to the environment.

[0133] Furthermore, the fan 201 used in the DCFCU 20 that constitutes the air conditioning system 1 described above is a fan that operates on direct current, thereby achieving energy savings. The coil 203 used in the DCFCU 20 is a dry coil that removes sensible heat from the air being blown out. Therefore, the surface of the coil 203 is dry, which prevents dust and other particles from adhering to the surface. Therefore, the DCFCU 20 does not need to include a filter on the side of the coil 203 that is closer to the space to be air-conditioned. In other words, the DCFCU 20 has a structure in which the face panel 204 can be opened and each component can be easily replaced from the side of the space to be air-conditioned.

[0134] Furthermore, with the DCFCU20A that is retrofitted to the desk 30 as described above, even if the specifications of the DCFCU20A or the desk 30 are changed after the DCFCU20A has been retrofitted to the desk 30, the DCFCU20A can be removed from the desk 30 by removing the screws that fasten the DCFCU20A to the desk 30. Then, the DCFCU20A whose specifications have been changed can be easily re-fixed to the desk 30. In other words, with the DCFCU20A as described above, changes in specifications can be easily accommodated.

[0135] Furthermore, the DCFCU 20A as described above has a simple structure because it is formed from the fan 303 and the coil 307. This reduces the weight of the DCFCU 20A, making it easy to change the layout of the DCFCU 20A. Furthermore, the DCFCU 20A as described above can be removed from the desk 30 for easy maintenance. In other words, the DCFCU 20A as described above is easy to handle.

[0136] Furthermore, since the DCFCU 20A as described above is attached to the underside of the top panel 31 of the desk 30, the desk 30 does not need to have space to accommodate the DCFCU 20A, improving the freedom of selection of the desk 30. Furthermore, since the DCFCU 20A as described above is attached to the underside of the top panel 31 of the desk 30, there is no need to customize the components that form the DCFCU 20A to fit the desk 30. This reduces the initial cost.

[0137] Furthermore, according to the DCFCU 20A described above, the fan 303 is installed on the far side as seen from the seated person. Therefore, the degree to which the seated person perceives the operating noise of the fan 303 is reduced. Furthermore, the far side as seen from the seated person is a place that the legs of the seated person are less likely to come into contact with when the seated person sits down, compared to a place in front of the seated person. Therefore, the size of the fan 303 installed in this place Even if the fan size is large, when a seated person sits down, the legs of the seated person are prevented from hitting the underside of the housing portion 304 that houses the fan 303. In other words, by installing a large-sized fan 303, the output of the fan 303 is suppressed, and the operating noise of the fan 303 is reduced.

[0138] Furthermore, with the DCFCU 20A described above, the space through which the air blown out from the fan 303 travels toward the seated side of the seated occupant is narrowed in the direction of travel by the outer surface 372 of the coil 307. Therefore, the blown air flows smoothly through the space and uniformly exchanges heat with the coil 307. This prevents a decrease in the efficiency of heat exchange between the blown air and the coil 307, and also reduces pressure loss of the blown air.

[0139] Furthermore, according to the DCFCU 20A described above, the outer surface 372 of the coil 307 is disposed upright so as to face the direction in which the fan 303 is installed, thereby reducing the height dimension of the coil 307. This allows the housing 304 of the DCFCU 20A to be made thinner.

[0140] Furthermore, in the DCFCU 20A described above, the rectangular duct 305 ensures a sufficient area for the blown-out air to pass through while being thin. Therefore, while cool air is appropriately supplied to the seated occupant, the occupant's legs are prevented from coming into contact with the duct 305, causing discomfort to the occupant. Furthermore, the step at the communicating portion between the accommodation section 304 and the duct 305 is provided with an inclined surface 306, so that the blown-out air that passes through the gaps between the flow tube members 371 of the coil 307 naturally and efficiently moves along the inclined surface 306 toward the seated side of the occupant. Therefore, when the blown-out air enters the duct 305 from the accommodation section 304, pressure loss due to the blown-out air hitting the step is prevented.

[0141] Furthermore, the cross-sectional size of duct 305 in the direction from the location where fan 303 is installed toward the seated side of the seated person is smaller than the cross-sectional size of accommodation section 304. Therefore, the flow velocity of the air blown out from outlet 309 of fan 303 increases when it enters duct 305. Therefore, air with an appropriate force is supplied toward the seated person from air inlet 320 at the end of duct 305 on the seated side of the seated person.

[0142] Furthermore, with the desk 30 equipped with the DCFCU 20A as described above, air is drawn into the fan 303 from the space under the legs of the seated person (the space below the tabletop), and temperature-adjusted air is blown out to the seated person. Therefore, if warm air accumulates in the space under the legs of the seated person, the warm air can be removed and cool air can be supplied to the seated person. In other words, the desk 30 equipped with the DCFCU 20A as described above can provide comfort to the seated person.

[0143] <Other variations> In the above embodiment, the first air conditioning means is formed by the DCFCU 20B, the desk 30 (DCFCU 20A), the outdoor air processing machine 60, the direct supply system secondary pump 21, and the pump 23, but the first air conditioning means is not limited to this configuration and may be formed to condition the space to be air-conditioned by exchanging heat with at least a portion of the well water delivered by the well water supply pump 4. Also, in the above embodiment, the second air conditioning means is described as being formed by the DCFCU 20, the radiant panel unit 40, the outdoor air processing machine 50, the outdoor air processing machine 80, the heat storage system secondary pump 41, and the pump 43, but is not limited to this configuration example and may be formed to condition the space to be air-conditioned by exchanging heat with well water stored in the water tank 10 and delivered by the well water heat storage pump-up pump 13.

[0144] In addition, the water flowing inside the flow pipe member 371 of the DCFCU 20A provided on the desk 30 placed in the space to be air-conditioned as shown in FIG. 14 is made to flow into the secondary side of the heat exchanger 14, and heat is stored. The heat may be exchanged with high-temperature well water stored in the tank 11 and storing heat. This is because a radiation panel unit 40 is installed in the air-conditioned space as shown in Fig. 14, and the air-conditioned space is uniformly cooled by the radiation panel unit 40. Therefore, the air-conditioning effect can be maintained even if well water stored in the heat storage tank 11, which has a higher temperature than well water directly delivered from the well, is used for the DCFCU 20A.

[0145] In the above embodiment, the well water supply pump 4 operates in two modes, but the number of operating modes is not limited to two. In the above embodiment, the amount of well water flowing into the primary side of the heat exchanger 5 is adjusted so that the outlet temperature of the chilled water on the secondary side of the heat exchanger 5 is a predetermined temperature in the daytime mode. However, the adjustment of the amount of well water flowing into the primary side of the heat exchanger 5 is not limited to this example. Similarly, the well water thermal storage pump 13 adjusts the amount of well water flowing into the primary side of the heat exchanger 14 so that the outlet temperature of the chilled water on the secondary side of the heat exchanger 14 is a predetermined temperature. However, the adjustment of the amount of well water flowing into the primary side of the heat exchanger 14 is not limited to this example. In the above embodiment, the outside air dehumidified and cooled by the outside air processor 60 is supplied as chilled air to the air-conditioned space. However, the air-conditioning system 1 does not have to include the outside air processor 60.

[0146] In the above embodiment, a plurality of DCFCUs 20B and desks 30 (DCFCUs 20A) are provided in the air-conditioned space, but there is no limit to the number of units that can be provided. Furthermore, the DCFCUs 20B and desks 30 (DCFCUs 20A) do not necessarily have to be provided. Furthermore, the direct supply system secondary pump 21 sets the amount of chilled water circulated between the heat exchanger 5 and the DCFCUs 20B based on the number of DCFCUs 20B in operation, but the amount of chilled water does not have to be based on the number of operating DCFCUs 20B. Furthermore, while the DCFCUs 20, radiant panel units 40, outdoor air processors 50, and outdoor air processors 80 have been cited as examples of the second air-conditioning means of the present invention, the second air-conditioning means may not uniformly adjust the temperature of the entire air-conditioned space, but may instead adjust the temperature of each location in the air-conditioned space individually.

[0147] Furthermore, the locations where the devices that supply cool air to the air-conditioned spaces are placed are not limited to the ceiling of the air-conditioned spaces, a desk placed in the air-conditioned spaces, etc. The radiant panel unit may be installed in multiple air-conditioned spaces, or the radiant panel unit itself may not be installed.

[0148] Furthermore, the outdoor air processor 50 does not have to be provided downstream of the radiant panel unit 40, the DCFCU 20, and the outdoor air processor 80. Furthermore, the chillers 70A and 70B do not have to be provided. That is, heat exchange with the cold water used in each air supply means does not have to be performed in the heat exchangers 22 and 42 to which the cold and hot water is supplied from the chillers. Furthermore, the location where the water tank 10 is installed is not limited to under the floor of the space to be air-conditioned.

[0149] In the above embodiment, each air supply means supplies cold air to the space to be air-conditioned, but each air supply means may supply warm air to the space to be air-conditioned. The heat medium flowing into the heat exchanger that generates the warm air in each air supply means may be heated by heat exchange between the heat medium and well water. The well water in the water tank 10 may also absorb cold heat from the space to be air-conditioned and store it.

[0150] In the above embodiment, the fan 303 is installed so that the air it blows out faces the back surface of the tabletop 31. The airflow pipe member 371 is installed facing up so that the outer surface 372 faces the direction in which the fan 303 is installed. However, the air outlet 309 of the fan 303 does not have to face the back surface of the tabletop 31. The outer surface 372 does not have to be installed facing up so that it faces the direction in which the fan 303 is installed. For example, the air outlet 309 of the fan 303 is installed facing the side of the tabletop 31, and the outer surface 372 of the coil 307 may be provided at a predetermined angle so as to narrow the space in the direction of travel of the air blown out from the fan 303 when viewed from the fan 303.

[0151] In the above embodiment, the bottom of the conduit 305 is provided in a stepped shape toward the back surface of the top board 31 of the desk 30 relative to the bottom surface of the storage section 304, but this stepped portion does not have to be provided. Moreover, when the stepped portion is provided, the inclined surface 306 does not have to be provided at the stepped portion.

[0152] Furthermore, in the above embodiment, an example was shown in which DCFCU20A is retrofitted to a desk 30 used by a seated person, but DCFCU20A may also be retrofitted to a desk used by a user in a standing position.

[0153] Although one example of a preferred embodiment of the present invention has been described above, the present invention is not limited to the illustrated embodiment. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the ideas described in the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the embodiments and modifications disclosed above can be combined with each other. [Explanation of symbols]

[0154] 1··Air conditioning system:2··Well water pump:3··Pump tank:4··Well water supply pump:5··Heat exchanger:6··Valve:7··Valve:8··Valve:10··Water tank:11··Thermal storage tank:12··Return tank:13··Well water thermal storage pump:14··Heat exchanger:15··Valve:16··Valve:17··Well water return pump:21··Secondary supply pump:22··Heat exchanger:23··Pump:30··Desk:31··Tabletop:32··Back panel:40··Radiant panel unit:41··Secondary thermal storage pump:42··Heat exchanger:43· Pump: 50 Outdoor air treatment unit: 60 Outdoor air treatment unit: 70A, 70B Chiller: 80, 80A, 80B Outdoor air treatment unit: 90 Hot water storage tank: 91 Heat exchanger: 92A, 92B Generator: 93A, 93B Generator exhaust heat circulation pump: 94 Secondary hot water pump: 95 Pump: 96 Steam boiler: 97 Heat exchanger: 98 Water return tank: 99 Secondary pump: 100 Primary dryer: 201 Fan: 202 Baffle plate: 203, 203B Coil: 204 Face panel: 205 Hole :206··Claw:207··Open catch:208··Fall prevention wire:209··Upper chamber:210··Substrate:211··Control chip:212··Wireless module:213··Lower chamber:214··Swirl vane-shaped member:302··Duct:303··Fan:304··Accommodation section:305··Pipe line:306··Inclined surface:307··Coil:309··Outlet:310··Substrate:311··Control chip:312··Wireless module:319··Outlet face:320··Air intake port:341··Intake Inlet: 371 ·· Flow tubing: 372 ·· Outer surface: 373 ·· Inlet: 374 ·· Outlet: 401 ·· Coil: 402 ·· Main piping: 403 ·· Piping: 404 ·· Radiant panel: 601 ·· Total heat exchanger: 602 ·· Rotor: 603 ·· Heat exchanger: 604 ·· Heat exchanger: 605 ·· Fan: 606 ·· Total heat exchanger: 607 ·· Fan: 608 ·· Heat exchanger: 801 ·· Total heat exchanger: 802, 802A, 802B ·· Heat exchanger: 803, 803A, 803B ·· Heat exchanger: 804 ·· Fan: 805 ·· Fan:

Claims

1. A fan coil unit installed on the ceiling of a space to be air-conditioned, a main body incorporating a fan that blows air toward the space to be air-conditioned and a coil through which a heat medium passes that exchanges heat with the air blown out from the fan; a face panel disposed on a surface of the main body facing the target space, The face panel includes: a first portion on one end side of the face panel, the first portion being detachably hooked onto the main body by inserting an end portion thereof; a second portion detachably attached to the main body at the other end of the face panel; fixed to the body by the first portion and the second portion; When the second portion is released from the pressure after being pressed toward the main body, the second portion forms a gap between the face panel and the main body while being attached to the main body. Fan coil unit.

2. A fan coil unit installed on the ceiling of a space to be air-conditioned, a main body incorporating a fan that blows air toward the space to be air-conditioned, a coil through which a heat medium that exchanges heat with the air blown out from the fan passes, and a plate-like member that is disposed between the fan and the coil and has a plate surface that is disposed so as to block the air blown out from the fan; a face panel disposed on a surface of the main body facing the target space, The face panel includes: an array of holes for passing air from the fan that has passed through the coil; a first portion on one end side of the face panel that is engaged with the main body; a second portion attached to the main body at the other end of the face panel; fixed to the body by the first portion and the second portion; When the second portion is released from the pressure after being pressed toward the main body, the second portion forms a gap between the face panel and the main body while being attached to the main body. Fan coil unit.

3. When the second portion is pressed toward the main body and then released from the pressure, the second portion forms a gap between the face panel and the main body in a state of being attached to the main body, into which a finger can be inserted, and the finger When the air conditioner is pulled toward the target space by the air conditioner, it separates from the main body.

3. The fan coil unit according to claim 1 or 2.

4. The second part is attached to the main body by the magnetic force of a magnet. The fan coil unit according to any one of claims 1 to 3.

5. The first portion further includes a wire for preventing the body from falling and connecting the body and the face panel. The fan coil unit according to any one of claims 1 to 4.

6. a plate-like member provided downstream of the fan and having a plate surface arranged to block the air blown out from the fan; The fan coil unit according to any one of claims 1 to 5.

7. The coil is a dry coil that removes sensible heat from the air being blown out. The fan coil unit according to any one of claims 1 to 6.

8. By arranging a plurality of the fan coil units, each fan coil unit individually supplies conditioned air to a respective location in the air-conditioned space, thereby adjusting the temperature of each location in the air-conditioned space. The fan coil unit according to any one of claims 1 to 7.

9. A fan coil unit according to any one of claims 1 to 8, Air conditioning system.

10. Further provided is a water pump for pumping well water, The heat medium passing through the coil is the well water.

10. The air conditioning system of claim 9.

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