Air conditioning system

Abstract

We will realize an air conditioning system using latent heat storage material to meet the demand for increased demand response. [Solution] The system comprises a radiant panel 10 containing a latent heat storage material, a housing 20 housing a heat transfer medium for heat exchange with the latent heat storage material, a circulation device 30 for circulating the heat transfer medium, and a control device 40 for controlling the set temperature of the heat transfer medium. The control device 40 changes the set temperature of the heat transfer medium from the normal set temperature when a request for increased demand response is received, and returns the set temperature of the heat transfer medium to the normal set temperature when the request for increased demand response is canceled.

Description

Technical Field

[0001] The present invention relates to an air conditioning system, and more particularly to an air conditioning system that performs radiant air conditioning and includes a radiant panel that houses a latent heat storage material therein.

Background Art

[0002] In recent years, from the viewpoint of energy conservation and the like, an air conditioning system that combines radiant air conditioning and heat storage technology has attracted attention. Among heat storage technologies, an air conditioning system using a latent heat storage material can store and cool a large amount of heat in a small volume. Further, by combining radiant air conditioning and a latent heat storage material, it becomes easy to maintain the surface temperature of the cooling surface of the radiant air conditioning system in the temperature range in which the latent heat storage material undergoes a phase change, and a stable indoor environment can be constructed.

[0003] As a method of storing and cooling a latent heat storage material, for example, a method of utilizing a mechanical heat source such as a heat pump or natural energy can be mentioned. By storing and cooling the latent heat storage material mainly in a time zone when the power demand is small and a time zone when the heat demand is small, it can be utilized for peak shifting of power consumption and heat load.

[0004] As an example of combining radiant air conditioning and latent heat technology, Patent Document 1 discloses an air conditioning system that performs radiant air conditioning by disposing a heat storage medium that combines a latent heat storage material and a sensible heat storage material in a ceiling cavity space on the back side of a radiant panel that forms a ceiling surface. By using both a sensible heat storage material having excellent heat absorption characteristics and a latent heat storage material having excellent heat dissipation characteristics, unstable natural energy can be effectively utilized.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In recent years, a mechanism called "upward demand response" (hereinafter referred to as "upward DR (Demand Response)") has become known, in which power companies request power consumers (hereinafter referred to as "users") to increase their power consumption during periods when the supply of electricity exceeds the demand for electricity. Furthermore, from the perspective of efficiently utilizing energy, air conditioning systems using latent heat storage materials are also required to respond to upward DR requests. [Means for solving the problem]

[0007] An air conditioning system according to one aspect of the present invention comprises a radiant panel containing a latent heat storage material, a housing for a heat transfer medium that exchanges heat with the latent heat storage material, a circulation device for circulating the heat transfer medium, and a control device for controlling the set temperature of the heat transfer medium, wherein the control device changes the set temperature of the heat transfer medium from the normal set temperature when a request for increased demand response is received, and returns the set temperature of the heat transfer medium to the normal set temperature when the request for increased demand response is canceled. [Effects of the Invention]

[0008] According to one aspect of the present invention, an air conditioning system using a latent heat storage material that responds to the demand for increased demand response (DR) can be realized. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram showing the configuration of an air conditioning system, which is an example of an embodiment. [Figure 2] This is a block diagram showing the configuration of an air conditioning system, which is an example of an embodiment. [Figure 3] This is a diagram illustrating a method for adjusting the temperature of a circulating heat transfer medium. [Figure 4] This is a diagram illustrating a method for adjusting the temperature of a circulating heat transfer medium. [Figure 5] This is a diagram illustrating a method for adjusting the temperature of a circulating heat transfer medium. [Figure 6]This is a diagram illustrating a method for adjusting the temperature of a circulating heat transfer medium. [Figure 7] This flowchart shows the processing procedure in an air conditioning system, which is an example of an embodiment. [Modes for carrying out the invention]

[0010] Hereinafter, an example of an embodiment of the air conditioning system according to this disclosure will be described in detail with reference to the drawings. The embodiment described below is merely an example, and this disclosure is not limited to the embodiments described below. Furthermore, selectively combining the components of the multiple embodiments and modifications described below is within the scope of this disclosure.

[0011] Figure 1 is a schematic diagram showing the configuration of the air conditioning system 1 of this embodiment, and is a cross-sectional view of one floor of a building M in which the air conditioning system 1 is installed, viewed from the side. Figure 2 is a block diagram showing the configuration of the air conditioning system 1. The building M is, for example, a large store or office building, and has one or more floors. The number of floors of the building M is not particularly limited.

[0012] As shown in Figures 1 and 2, the air conditioning system 1 is a radiant air conditioning system having a radiant panel 10 that houses a latent heat storage material. In addition to the radiant panel 10, the air conditioning system 1 includes a temperature sensing unit 11 that measures the surface temperature of the radiant panel 10, piping 20 that serves as a housing for a heat transfer medium that exchanges heat with the latent heat storage material, a circulation device 30 that circulates the heat transfer medium, and a control device 40 that controls the air conditioning system 1 overall. The radiant panel 10 is located on the ceiling of a living room 2 in building M.

[0013] The air conditioning system 1, for example, has a heating and cooling function and automatically executes either a cooling mode or a heating mode based on user operation or the temperature of the living room 2. In the cooling mode, the air conditioning system 1 circulates a heat transfer medium (e.g., chilled water) through the piping 20 using a circulation device 30, for example, during nighttime hours when electricity demand is low. Then, heat exchange occurs between the heat transfer medium and the latent heat storage material inside the radiant panel 10 via the piping 20. As a result, the latent heat storage material is cooled and enters a solid phase state. During daytime hours when the temperature rises, the temperature of the latent heat storage material rises, and the latent heat storage material undergoes a phase change from solid to liquid phase. At this time, the latent heat storage material absorbs heat from the air in the living room 2, the occupants W in the living room 2, equipment (not shown), the walls of the living room 2, and the floor of the living room 2. This lowers the room temperature of the living room 2.

[0014] The air conditioning system 1 is a system that controls the temperature of the heat medium in accordance with a demand response (DR) request from the power company. Specifically, in cooling operation mode, when the system receives a demand response request asking the user to increase their power consumption, it lowers the set temperature of the heat medium to below the normal set temperature, increasing power consumption while cooling the latent heat storage material contained in the radiant panel 10 and causing the latent heat storage material to undergo a phase change to a solid phase. When the demand response request is canceled, the set temperature of the heat medium is returned to the normal set temperature, and power consumption is reduced. As a result, after the demand response request is canceled, when the latent heat storage material undergoes a phase change from solid to liquid phase, the latent heat storage material absorbs heat from the room 2, thereby lowering the room temperature of the room 2. In other words, the energy consumed during the demand response request can be used to lower the room temperature of the room 2 after the demand response request is canceled.

[0015] The radiant panel 10 has, for example, a roughly rectangular parallelepiped shape and is positioned between the ceiling boards 3 that form the ceiling surface of the living room 2. That is, the lower surface of the radiant panel 10 is exposed to the interior from the ceiling boards 3 and forms part of the ceiling surface of the living room 2. Because the lower surface of the radiant panel 10 forms the ceiling surface, heat exchange between the air inside the living room 2 and the latent heat storage material inside the radiant panel 10 is facilitated.

[0016] The radiant panel 10 is inserted, for example, between the ceiling boards 3 from the outside and fixed to the ceiling boards 3 via bolts (not shown) or the like. The material of the ceiling boards 3 is not particularly limited and may be, for example, rock wool sound-absorbing board.

[0017] It is preferable that the radiant panel 10 is positioned so as not to come into contact with the underside of the upper structural frame 4 on the ceiling side of a predetermined floor of the building M, and furthermore, so as not to come into contact with the exterior walls or side walls of the building M. This reduces the amount of heat that escapes from the radiant panel 10 to the underside of the upper structural frame 4 and the aforementioned walls through heat conduction, making it possible to easily adjust the temperature of the air in the living space 2.

[0018] Preferably, the radiant panel 10 is sized to match the size of, for example, the ceiling board 3 used in a system ceiling (e.g., 600mm x 600mm), or to be sized such that multiple radiant panels 10 can be combined to achieve that size. In this case, it becomes possible to replace the existing ceiling board 3 with the radiant panel 10, and the air conditioning system 1 can be easily installed.

[0019] The radiation panel 10 may be made of a metal mainly composed of iron, but it is preferable that it be made of resin. In this case, the manufacturing cost of the radiation panel 10 can be reduced.

[0020] Examples of resins that can be used to make up the radiant panel 10 include high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP). When the radiant panel 10 is made of a resin material, it can be manufactured by blow molding. This method is effective when molding a shape having a hollow structure, as in this embodiment. The manufacturing method of the radiant panel 10 is not limited to blow molding; for example, it may also be manufactured by injection molding.

[0021] A continuous space is formed inside the radiant panel 10, and a latent heat storage material is housed inside. In other words, the outer wall of the container housing the latent heat storage material constitutes the outer wall of the radiant panel 10, and at least a portion of the outer wall of the container forms the ceiling surface.

[0022] The latent heat storage material housed in the radiant panel 10 is a heat storage material capable of phase change between a solid phase and a liquid phase. The latent heat storage material releases stored latent heat by phase changing from the liquid phase to the solid phase, and stores heat as latent heat by phase changing from the solid phase to the liquid phase.

[0023] When the air conditioning system 1 is used for cooling, a latent heat storage material is used that undergoes a phase change at approximately 16-22°C or below. Furthermore, it is preferable that the latent heat storage material is non-combustible. Examples of latent heat storage materials include sodium sulfate decahydrate (Na2SO4·10H2O), sodium acetate trihydrate (CH3COONa·3H2O), disodium hydrogen phosphate dodecahydrate (Na2HPO4·12H2O), sodium carbonate decahydrate (Na2CO3·10H2O), and sodium thiosulfate pentahydrate (Na2S2O3·5H2O), with sodium sulfate decahydrate being the most preferred.

[0024] In addition, an insulating material may be provided on the upper surface of the radiant panel 10. By providing an insulating material, the heat from the radiant panel 10 is prevented from escaping into the space above the ceiling. Examples of insulating materials include urethane, phenolic foam, and expanded polystyrene.

[0025] Furthermore, a film material containing aluminum foil or the like may be provided on the lower surface of the radiant panel 10. The film material may be provided, for example, to improve the aesthetic appearance or fire resistance of the radiant panel 10.

[0026] The temperature sensing unit 11 measures the surface temperature of the radiant panel 10. In the example shown in Figure 1, the temperature sensing unit 11 is located on the underside of the radiant panel 10 and is configured to measure the temperature of the underside of the radiant panel 10. The temperature sensing unit 11 may also be configured to measure the temperature of the upper surface of the radiant panel 10, in addition to or instead of the temperature of the underside of the radiant panel 10. The temperature sensing unit 11 can be any device capable of detecting temperature, and known devices such as thermocouples, resistance thermometers, or radiation temperature sensors can be used.

[0027] The piping 20 houses a heat transfer medium that exchanges heat with the latent heat storage material inside the radiant panel 10. The heat transfer medium inside the piping 20 is circulated by the circulation device 30. The piping 20 may be made of resin, but it is preferable that it be made of a metal with thermal conductivity, such as copper or stainless steel. Furthermore, from the viewpoint of suppressing metal deterioration, it is even more preferable to use a three-layer pipe (for example, an aluminum three-layer pipe) in which a metal film is sandwiched between layers of resin. In this embodiment, the heat transfer medium flowing through the piping 20 is chilled water. The configuration of the housing of the present invention is not particularly limited as long as it is possible to house a heat transfer medium that exchanges heat with the latent heat storage material inside the radiant panel 10.

[0028] The pipe 20 is fitted and fixed, for example, into a groove (not shown) provided in the radiant panel 10. This strengthens the connection between the radiant panel 10 and the pipe 20. As a result, the pipe 20 is less likely to shift, and heat exchange between the latent heat storage material inside the radiant panel 10 and the heat transfer medium inside the pipe 20 is facilitated.

[0029] The circulation device 30 is connected to the piping 20 and circulates the heat transfer medium flowing through the piping 20. The circulation device 30 is composed of, for example, a chiller, a cooling tower, etc. The location of the circulation device 30 is not particularly limited, but in this embodiment, the circulation device 30 is located on the roof of the building M. At least a part of the devices that make up the circulation device 30 may be installed indoors or underground.

[0030] The circulation device 30 has the function of adjusting the temperature of the heat medium flowing through the piping 20 based on a signal from the control device 40. The method for adjusting the temperature of the heat medium flowing through the piping 20 will be described later.

[0031] The control device 40 controls the entire air conditioning system 1, including the control of the set temperature of the heat transfer medium. In the example shown in Figure 1, the control device 40 is installed inside the building M. However, the control device 40 may reside on a server outside the building M, such as a cloud server. The control device 40 has a memory that stores various setting information, control programs, etc., and a processor that realizes its functions by reading and executing the control programs.

[0032] As shown in Figure 2, the control device 40 is connected to the temperature detection unit 11 and the circulation device 30, and acquires information necessary for control from the temperature detection unit 11 and the circulation device 30. The control device 40 is also configured to transmit control signals to the circulation device 30.

[0033] Furthermore, the control device 40 is connected to an external server 50, for example, via a wide-area communication network. The control device 40 receives information regarding DR requests from the external server 50. The external server 50 is, for example, a server of a power company or a server of the administrator of the air conditioning system 1. The configuration of the external server 50 is not particularly limited.

[0034] Next, a method for adjusting the temperature of the heat medium flowing through the piping 20 using the circulation device 30 will be described with reference to Figures 3 to 6. Note that the method for adjusting the temperature of the heat medium flowing through the piping 20 using the circulation device 30 is not limited to the methods shown in Figures 3 to 6.

[0035] In the example shown in Figure 3, the system includes a first flow path 101 through which a heat transfer medium (first heat transfer medium) circulates via a pipe 20 fixed to the radiant panel 10, and a second flow path 102 through which a second heat transfer medium, having a different temperature from the first heat transfer medium, circulates. A heat exchanger 103 is provided between the first flow path 101 and the second flow path 102 to exchange heat between the first and second heat transfer mediums. A constant flow pump 104 is provided in the first flow path 101, and a variable flow pump 105 is provided in the second flow path 102.

[0036] Furthermore, the second flow path 102 is further provided with a heat source device 106 for adjusting the temperature of the second heat medium and a water thermal storage tank 107 in which a portion of the second heat medium is stored. The water thermal storage tank 107 may be formed as one large tank (single-type thermal storage tank, single-use thermal storage tank) or as a plurality of small tanks connected via connecting pipes.

[0037] According to the method shown in Figure 3, the temperature of the heat medium (first heat medium) flowing through the piping 20 can be adjusted by adjusting the flow rate of the second heat medium sent to the heat exchanger 103. For example, if the temperature of the second heat medium is lower than the temperature of the first heat medium, the temperature of the first heat medium can be lowered by increasing the flow rate of the second heat medium. In other words, when a signal to lower the temperature of the heat medium flowing through the piping 20 is received from the control device 40, the flow rate of the second heat medium is increased. Conversely, when a signal to raise the temperature of the heat medium flowing through the piping 20 is received from the control device 40, the flow rate of the second heat medium is decreased.

[0038] The example shown in Figure 4 differs from the case shown in Figure 3 in that a water thermal storage tank 107 is not provided in the second flow path 102. In the case shown in Figure 4, as in the case shown in Figure 3, the temperature of the heat medium (first heat medium) flowing through the piping 20 can be adjusted by adjusting the flow rate of the second heat medium sent to the heat exchanger 103. For example, if the temperature of the second heat medium is lower than the temperature of the first heat medium, the temperature of the first heat medium can be lowered by increasing the flow rate of the second heat medium.

[0039] The example shown in Figure 5 differs from the cases shown in Figures 3 and 4 in that it does not have a second flow path 102. In addition, the first flow path 101 is provided with a heat source device 108 that adjusts the temperature of the heat transfer medium. Therefore, in the example shown in Figure 5, the temperature of the heat transfer medium at the outlet of the heat source device 108 becomes the temperature of the heat transfer medium flowing through the piping 20.

[0040] In the example shown in Figure 6, a three-way valve 110 is provided in the flow path through which the heat transfer medium flows. The three-way valve 110 has a first port 110A and a second port 110B. The first port 110A is connected to a first pipe 21 which is connected to a first heat source device 111. The second port 110B is connected to a second pipe 22 which branches off from the first pipe 21. A second heat source device 112 is provided on the second pipe 22.

[0041] According to the method shown in Figure 6, the temperature of the heat transfer medium flowing through the piping 20 fixed to the radiant panel 10 can be adjusted by controlling the opening and closing of the three-way valve 110. Specifically, when the first port 110A is opened and the second port 110B is closed, the heat transfer medium, which has been temperature-controlled by the first heat source device 111, is supplied. Conversely, when the first port 110A is closed and the second port 110B is opened, the heat transfer medium, which has been temperature-controlled by the second heat source device 112, is supplied.

[0042] The following describes the processing procedure in the air conditioning system 1 of this embodiment with reference to Figure 7. Figure 7 is a diagram showing the processing procedure of the control device 40.

[0043] As shown in Figure 7, when the control device 40 receives a DR request from the external server 50 (Step S1: Yes), the control device 40 sets the heat transfer medium set temperature (θ set_sp ) and surface set temperature (θ set_surf Check the current settings (Step S2).

[0044] And the heat transfer medium set temperature (θ set_sp ) and surface set temperature (θ set_surf The current setting of ) is the setting when DR is raised, i.e., θ set_sp =θ set_sp_DR And θset_surf = θ set_surf_DR When it is (Step S3: Yes), proceed to Step S5, and obtain the surface temperature (θ surf ) of the radiation panel 10 from the temperature detection unit 11.

[0045] On the other hand, when the current settings of the heat medium set temperature (θ set_sp ) and the surface set temperature (θ set_surf ) are not the settings during the up DR but the normal settings (Step S3: No), proceed to Step S4, and change the settings of the heat medium set temperature (θ set_sp ) and the surface set temperature (θ set_surf ) to the settings during the up DR.

[0046] Here, when the representative transition temperature from the liquid phase to the solid phase of the latent heat storage material inside the radiation panel 10 is θ trans , the heat medium set temperature (θ set_sp_DR ) during the up DR is a temperature lower than the representative transition temperature (θ trans ). Thereby, during the up DR, the latent heat storage material can be phase-changed to the solid phase. The heat medium set temperature (θ set_sp_DR ) during the up DR is, for example, 0.5 to 2.0 °C lower than the representative transition temperature (θ trans ).

[0047] Also, the surface set temperature (θ set_surf_DR ) during the up DR is a temperature lower than the normal surface set temperature (θ set_surf_normal ). Note that the surface set temperature (θ set_surf_DR ) during the up DR may be lower or higher than the representative transition temperature (θ trans ). Also, the surface set temperature (θ set_surf_DR ) during the up DR is, for example, 15 to 17 °C from the viewpoint of the comfort of the living room 2 and suppressing dew condensation on the radiation panel 10.

[0048] And after setting the heat medium set temperature (θ set_sp ) and the surface set temperature (θ set_surf ) to the settings during the up DR, in Step S5, obtain the surface temperature (θ surf ) of the radiation panel 10 from the temperature detection unit 11.

[0049] Subsequently, the acquired surface temperature (θ) surf ) is the surface set temperature (θ set_surf ) within a range (θ) that has changed by a predetermined temperature (δ1, δ2). set_surf -δ1~θ set_surf Determine whether or not it is within +δ2) (Step S6).

[0050] The acquired surface temperature (θ surf If the above range is true (Step S6: Yes), then the surface temperature (θ surf Since this is within the intended range, the current state of the heat transfer fluid supply is maintained (step S7). In other words, if the heat transfer fluid was being supplied up to that point, the heat transfer fluid supply is continued, and if the heat transfer fluid supply was stopped up to that point, the heat transfer fluid supply is kept stopped.

[0051] Thus, the surface temperature (θ surf By changing the heat transfer medium supply only when the temperature falls outside the above range, the frequency of changing the equipment settings can be reduced. As a result, equipment degradation can be reduced. The predetermined temperatures (δ1, δ2) are not particularly limited, but for example, they are 0.5 to 2°C. Also, δ1 and δ2 may be the same or different from each other. Furthermore, the predetermined temperatures (δ1, δ2) may be configured to be changeable depending on the content of the DR request, etc.

[0052] On the other hand, the acquired surface temperature (θ surf ) is the surface set temperature (θ set_surf ) within a range (θ) that has changed by a predetermined temperature (δ1, δ2). set_surf -δ1~θ set_surf If outside of (Step S6: No), adjust the temperature of the latent heat storage material and the surface temperature (θ surf ) must be kept within the above range.

[0053] Therefore, in step S8, for example, the surface temperature (θ surf ) is the surface set temperature (θ set_surfIt is determined whether the temperature has increased beyond a predetermined temperature (δ2) from ). Then, the surface temperature (θ surf ) is the surface set temperature (θ set_surf If the temperature has increased from (θ) to a predetermined temperature (δ2) (Step S8: Yes), the supply of the heat transfer medium is started to cool the latent heat storage material inside the radiant panel 10 (Step S9). This cools the surface temperature (θ) surf ) can be adjusted within the above range.

[0054] Also, the surface temperature (θ surf ) is the surface set temperature (θ set_surf If the temperature has dropped below a predetermined temperature (δ1) (Step S8: No), the supply of the heat transfer medium is stopped, and the cooling of the latent heat storage material inside the radiant panel 10 is stopped (Step S10).

[0055] Typically, upon receiving a request to raise the DR, the surface set temperature (θ set_surf ) is the normal surface setting temperature (θ set_sp_normal ) from the surface set temperature (θ) during DR. set_sp_DR When changed to ), the surface temperature immediately afterwards (θ surf ) is the surface set temperature (θ set_surf The temperature is higher than ). Therefore, the process proceeds to step S9, where a heat transfer medium is supplied to cool the latent heat storage material inside the radiant panel 10.

[0056] In the example shown in Figure 7, the amount of heat medium supplied is increased or decreased by starting or stopping the supply of the heat medium in steps S9 and S10, but the method of controlling the amount of heat medium supplied is not limited to this. For example, in steps S9 and S10, the amount of heat medium supplied may be continuously increased or decreased by P control, PI control, or PID control, etc. Furthermore, the control method and the parameter values ​​used for control may be set according to the content of the DR request, etc.

[0057] Next, we will explain what happens when the DR request to raise the temperature is canceled. When the control device 40 receives, for example, the cancellation of the DR request to raise the temperature from the external server 50 and the DR request to raise the temperature is no longer needed (step S1: No), the control device 40 sets the heat transfer medium set temperature (θ set_sp ) and surface set temperature (θ set_surf Check the current settings of (Step S11).

[0058] And the heat transfer medium set temperature (θ set_sp ) and surface set temperature (θ set_surf The current setting of ) is the setting when DR is raised, i.e., θ set_sp =θ set_sp_DR And θ set_surf =θ set_sp_DR If this is the case (Step S3: Yes), the heat transfer medium set temperature (θ set_sp ) and surface set temperature (θ set_surf Change the setting of ) back to the normal setting.

[0059] Here, the representative transition temperature from the liquid phase to the solid phase of the latent heat storage material inside the radiant panel 10 is θ. trans In this case, the normal setting temperature of the heat transfer medium (θ set_sp_normal ) is the representative transition temperature (θ trans The temperature is higher than (θ). As a result, under normal conditions, the latent heat storage material does not undergo a phase change from liquid to solid. Normal heat transfer medium set temperature (θ set_sp_normal ) is, for example, the representative transition temperature (θ trans This temperature is 0.5 to 2.0°C higher than [the specified temperature].

[0060] Also, the normal surface setting temperature (θ set_surf_normal ) is, as described above, the surface set temperature (θ) during the DR. set_surf_DR The temperature is higher than the normal surface setting temperature (θ). set_surf_normal From the perspective of comfort in living room 2, the temperature should be, for example, 18-21°C.

[0061] On the other hand, in step S11, the heat transfer medium set temperature (θ set_sp ) and surface set temperature (θ set_surfIf the current setting is the normal setting and not the setting for increased DR (Step 11: No), proceed to step S5 and check the surface temperature (θ) of the radiant panel 10. surf The temperature is obtained from the temperature detection unit 11.

[0062] Heat medium set temperature (θ set_sp ) and surface set temperature (θ set_surf After setting the ) to the normal setting, the amount of heat transfer fluid supplied is controlled in the processing procedure shown in steps S5 to S10, as in the case described above, and the surface temperature (θ surf Adjust the following. Note that the predetermined temperatures (δ1, δ2) in steps S6 and S8 may be the same as or different from the values ​​during the rise DR.

[0063] As described above, when the air conditioning system 1 of this embodiment receives a request for increased demand response (DR), it lowers the set temperature of the heat medium to a lower temperature than the normal set temperature, cooling the latent heat storage material contained in the radiant panel 10 and changing it to a solid phase. This allows the power consumption on the heat source side to be increased when an increased demand response (DR) request is made. When the increased demand response (DR) request is canceled, the set temperature of the heat medium is returned to the normal set temperature, reducing the power consumption. This allows the latent heat storage material to absorb heat from the air in the living room 2 and change to a liquid phase, thereby lowering the room temperature in the living room 2. Furthermore, since the air conditioning system 1 of this embodiment can respond to an increased demand response (DR) request simply by changing the set temperature of the heat medium, it does not require the introduction of additional equipment such as a heat storage tank or battery.

[0064] Furthermore, in this embodiment, the air conditioning system 1 reduces the amount of heat medium supplied when the temperature measured by the temperature detection unit 11 falls below a predetermined temperature from a preset surface temperature, and increases the amount of heat medium supplied when the temperature measured by the temperature detection unit 11 rises above a predetermined temperature from a preset surface temperature. This reduces the frequency of changing the settings of the equipment. As a result, it is possible to reduce the deterioration of the equipment associated with changes in the settings of the equipment.

[0065] Furthermore, the air conditioning system 1 of this embodiment lowers the surface set temperature to a lower temperature than the normal surface set temperature when a request for increased DR is received. This makes it easier to cool the latent heat storage material more and convert it to a solid phase when a request for increased DR is received. Also, the air conditioning system 1 of this embodiment returns the surface set temperature to the normal surface set temperature when the request for increased DR is canceled. Generally, the temperature measured by the temperature detection unit 11 immediately after the request for increased DR is canceled will be lower than the normal surface set temperature. Therefore, immediately after the request for increased DR is canceled, the amount of heat transfer medium supplied is reduced or the supply of heat transfer medium is stopped. As a result, it is possible to suppress the heating of the latent heat storage material by the heat transfer medium immediately after the request for increased DR is canceled.

[0066] In the above embodiment, the flow when a request for increased DR is received during cooling operation was described, but the air conditioning system 1 of the present invention can also be applied to heating operation.

[0067] During heating operation, when the air conditioning system 1 receives a request for increased DR (Demand Response), it increases the set temperature of the heat transfer medium above the normal set temperature, heating the latent heat storage material contained in the radiant panel 10 and changing it to the liquid phase. This allows the power consumption on the heat source side to be increased when an increased DR request is made. When the increased DR request is canceled, the set temperature of the heat transfer medium is returned to the normal set temperature, reducing power consumption. This allows the latent heat storage material to release heat as it changes phase to the solid phase, thereby raising the room temperature in the living room 2.

[0068] Furthermore, during heating operation, the air conditioning system 1 may reduce the amount of heat medium supplied when the temperature measured by the temperature sensing unit 11 rises above a predetermined temperature from a preset surface temperature, and increase the amount of heat medium supplied when the temperature measured by the temperature sensing unit 11 falls below a predetermined temperature from a preset surface temperature. This reduces the frequency of changing the settings of the equipment. As a result, equipment deterioration associated with changes in equipment settings can be reduced.

[0069] Furthermore, during heating operation, the air conditioning system 1 may increase the surface set temperature above the normal surface set temperature when it receives a request for increased DR. This makes it easier to heat the latent heat storage material and change it to the liquid phase when an increased DR request is made. Alternatively, the surface set temperature may be returned to the normal surface set temperature when the increased DR request is canceled. Generally, the temperature measured by the temperature sensing unit 11 immediately after the increased DR request is canceled will be higher than the normal surface set temperature. Therefore, immediately after the increased DR request is canceled, the amount of heat transfer medium supplied is reduced or the supply of heat transfer medium is stopped. As a result, it is possible to suppress the cooling of the latent heat storage material by the heat transfer medium immediately after the increased DR request is canceled. [Explanation of Symbols]

[0070] 1 Air conditioning system, 2 Living room, 3 Ceiling board, 4 Upper structure, 10 Radiant panel, 11 Temperature sensing unit, 20 Piping (storage), 21 First piping, 22 Second piping, 30 Circulation device, 40 Control device, 50 External server, 101 First flow path, 102 Second flow path, 103 Heat exchanger, 104 Metering pump, 105 Variable flow pump, 106 Heat source device, 107 Water thermal storage tank, 108 Heat source device, 110 Three-way valve, 110A First port, 110B Second port, 111 First heat source device, 112 Second heat source device, W Occupants.

Claims

1. A radiant panel containing a latent heat storage material inside, A housing for housing a heat transfer medium that exchanges heat with the latent heat storage material, A control device for controlling the set temperature of the heat transfer medium, Equipped with, The control device is an air conditioning system that, when it receives a request for increased demand response, changes the set temperature of the heat medium from the normal set temperature, and returns the set temperature of the heat medium to the normal set temperature when the request for increased demand response is canceled.

2. The air conditioning system according to claim 1, wherein the control device, upon receiving a request for increased demand response, lowers the set temperature of the heat medium to a lower temperature than the normal set temperature, and returns the set temperature of the heat medium to the normal set temperature when the request for increased demand response is canceled.

3. The system further includes a temperature detection unit for measuring the surface temperature of the radiant panel, The control device is When the temperature measured by the temperature sensing unit falls below a predetermined temperature from a preset surface temperature, the amount of heat transfer fluid supplied is reduced. The air conditioning system according to claim 2, wherein the amount of heat transfer medium supplied is increased when the temperature measured by the temperature sensing unit rises above a predetermined temperature from a preset surface temperature.

4. The air conditioning system according to claim 3, wherein the control device, upon receiving a request for increased demand response, lowers the surface set temperature to a lower temperature than the normal surface set temperature, and returns the surface set temperature to the normal surface set temperature when the request for increased demand response is canceled.

5. The air conditioning system according to claim 1, wherein the control device increases the set temperature of the heat medium above the normal set temperature when it receives a request for increased demand response, and returns the set temperature of the heat medium to the normal set temperature when the request for increased demand response is canceled.

6. The system further includes a temperature detection unit for measuring the surface temperature of the radiant panel, The control device is When the temperature measured by the temperature sensing unit increases beyond a predetermined temperature from a preset surface temperature, the amount of heat transfer fluid supplied is reduced. The air conditioning system according to claim 5, wherein the amount of heat transfer medium supplied is increased when the temperature measured by the temperature sensing unit falls below a predetermined temperature from a preset surface temperature.

7. The air conditioning system according to claim 6, wherein the control device increases the surface set temperature above the normal surface set temperature when it receives a request for increased demand response, and returns the surface set temperature to the normal surface set temperature when the request for increased demand response is canceled.

8. The air conditioning system according to claim 1, wherein the radiant panel constitutes the ceiling surface in the interior of a building.

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