Air conditioning system

Abstract

To curb increases in conveying power of an air conditioner and a duct size.SOLUTION: An air-conditioning system (10) adjusts an indoor temperature to a set temperature. The air-conditioning system comprises: an air conditioner (11) which produces air-conditioned air with a temperature thereof adjusted to a temporary air supply temperature; a duct (31) which guides the air-conditioned air from the air conditioner to a room interior (5); a chamber (35) which is installed at a downstream side of the duct; and a blower (38) which sends air in the room interior to the chamber. In the chamber, the air-conditioned air guided through the duct is mixed with the air sent from the room interior. The air-conditioned air with a temperature thereof adjusted to a target air supply temperature is then supplied to the room interior from the chamber.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, air conditioning systems that circulate air within a building to perform air conditioning and ventilation are known (see, for example, Patent Document 1). In the air conditioning system described in Patent Document 1, outside air is introduced into an air conditioner from outdoors, and return air is drawn into the air conditioner from the room to be air-conditioned. The return air from the room is mixed with outside air in the air conditioner and reused, and some of the return air is discharged from the air conditioner to the outdoors. Furthermore, the air conditioner performs air conditioning processes such as adjusting the temperature and humidity of the mixed air of the return air, and the conditioned air is supplied from the air conditioner to the room through a duct. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-18000 Summary of the Invention [Problem to be solved by the invention]

[0004] To handle the indoor air conditioning load, the airflow rate of the air conditioner is adjusted according to the supply air temperature, but the smaller the temperature difference between the indoor set temperature and the supply air temperature, the more the airflow rate of the air conditioner must be increased, which creates problems such as increased air conditioning power and duct size.

[0005] The present invention has been made in view of the above points, and has an object to provide an air conditioning system that can suppress increases in the conveying power of the air conditioner and the duct size. [Means for solving the problem]

[0006] An air conditioning system according to one aspect of the present invention is an air conditioning system that adjusts the temperature of a room to a set temperature, and includes an air conditioner that produces conditioned air adjusted to a provisional supply air temperature, a duct that guides the conditioned air from the air conditioner toward the room, a chamber installed downstream of the duct, and a blower that sends indoor air into the chamber, wherein the conditioned air from the duct and the indoor air are mixed in the chamber, and conditioned air at a target supply air temperature is supplied from the chamber to the room. The air conditioner resets the provisional supply air temperature in accordance with the room temperature, and when the provisional supply air temperature is reset in a direction that reduces the processing capacity of the air conditioning load, the blower reduces the blowing amount. . [Effects of the Invention]

[0007] In one embodiment of the air conditioning system of the present invention, conditioned air at a provisional supply temperature is mixed with room air in a chamber downstream of a duct to produce conditioned air at a target supply temperature. Conditioned air is supplied from the chamber to the room using the airflow volume of the air conditioner and the airflow volume of the blower, adjusting the room temperature to the set temperature. The airflow volume of the air conditioner can be reduced by the amount of air sent from the room to the chamber by the blower, thereby minimizing the air conditioning unit's transport power and duct size. Furthermore, reducing the amount of conditioned air passing through the duct reduces pressure loss in the duct, reducing the transport power required for the entire system. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an air conditioning system according to a first embodiment. [Figure 2] FIG. 2 is a diagram schematically showing a psychrometric chart of changes in the state of air in the air conditioning system of the first embodiment. [Figure 3] FIG. 10 is a schematic diagram of an air conditioning system according to a second embodiment. [Figure 4] FIG. 1 is a schematic diagram of a ceiling-air-conditioning system according to Comparative Example 1. [Figure 5] FIG. 10 is a schematic diagram of a floor-air-discharge air-conditioning system according to Comparative Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0009] First, before describing the air conditioning system of this embodiment, a ceiling-air-conditioning system and a floor-air-conditioning system of comparative examples will be described. Fig. 4 is a schematic diagram of a ceiling-air-conditioning system of comparative example 1. Fig. 5 is a schematic diagram of a floor-air-conditioning system of comparative example 2.

[0010] As shown in Figure 4, in a ceiling-discharge air conditioning system 100 of Comparative Example 1, an air supply duct 103 extends from an air conditioner 101 to a ceiling air outlet 102, and a return air duct 106 extends from an indoor air inlet 104 to the air conditioner 101. The air conditioner 101 adjusts the supply air temperature (discharge temperature) and airflow rate of the conditioned air according to the temperature of the room 107, and the conditioned air is blown out from the ceiling air outlet 102 to maintain the temperature of the room 107 at a set temperature. In ceiling-discharge air conditioning, for example, when the set temperature of the room 107 during cooling is set to 26°C, the supply air temperature of the conditioned air is adjusted to 16°C.

[0011] 5, in the underfloor air conditioning system 110 of Comparative Example 2, an air supply duct 113 extends from the air conditioner 111 to the underfloor chamber 112, and a return air duct 116 extends from the indoor air inlet 114 to the air conditioner 111. In underfloor air conditioning, the air conditioner 111 also adjusts the supply air temperature and blowing volume of the conditioned air according to the temperature of the room 117, but the supply air temperature is set so that the temperature difference with the set temperature of the room 117 is smaller than in ceiling air conditioning, taking into consideration the discomfort (cold feeling) of people in the room close to the floor. For example, when the set temperature of the room 117 during cooling is set to 26°C, the supply air temperature of the conditioned air is adjusted to 19°C.

[0012] In ceiling-air-discharge air conditioning, the temperature difference between the set temperature (26°C) of the room 107 and the supply air temperature (16°C) is 10°C. On the other hand, in floor-air-discharge air conditioning, the temperature difference between the set temperature (26°C) of the room 117 and the supply air temperature (19°C) is 7°C. For this reason, floor-air-discharge air conditioning cannot handle the air conditioning load (cooling load) of the room 117 unless the volume of conditioned air sent out is increased by about 40%. In order to increase the volume of conditioned air sent out, the transport power of the air conditioner 111 and the duct size of the supply air duct 113 must be increased. Therefore, in the floor-air-discharge air conditioning system of this embodiment, indoor air is drawn in downstream of the duct to ensure the volume of conditioned air sent out, thereby reducing the volume of air sent out by the air conditioner and suppressing increases in transport power and duct size.

[0013] First Embodiment The air conditioning system of the first embodiment will be described in detail below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of the air conditioning system of the first embodiment. Note that the following description will focus on air conditioning during cooling, but the same applies to air conditioning during heating.

[0014] As shown in Figure 1, room 1 in the first embodiment has a double floor structure, with an underfloor space formed between floor slab 2 and floor surface 3. An interior zone and a perimeter zone are defined within interior space 5 of room 1. An airflow stopper 7 is installed in the underfloor space to separate the interior zone from the perimeter zone, forming an underfloor chamber 35 for the interior zone and an underfloor chamber 45 for the perimeter zone. An air conditioner 11 is connected to underfloor chamber 35, and a perimeter air conditioner 41 is connected to underfloor chamber 45.

[0015] In the air conditioning system 10 for the interior zone, the air conditioner 11 and the underfloor chamber 35 are connected by an air supply duct (duct) 31, and the side wall 4 of the room 1 and the air conditioner 11 are connected by a return air duct 32. Fresh air is introduced into the air conditioner 11 from outside, and return air is drawn in from the interior zone. The return air circulates within the air conditioning system 10, and some of the return air is exhausted outdoors from the air conditioner 11. The return air and fresh air are mixed in the air conditioner 11, and temperature adjustments and other processes are performed on the mixed air to create conditioned air, which is then sent from the air conditioner 11 toward the underfloor chamber 35.

[0016] The inside of a case 12 of the air conditioner 11 is divided by a partition wall 13 into an air supply passage 14 and an exhaust passage 15. An outside air intake port 16 connected to the air supply passage 14 and a return air exhaust port 17 connected to the exhaust passage 15 are formed in the case 12. A total heat exchanger 18 is installed inside the case 12 downstream of the outside air intake port 16 and upstream of the return air exhaust port 17, straddling the air supply passage 14 and the exhaust passage 15. Heat is exchanged between the return air in the exhaust passage 15 and the outside air in the air supply passage 14 by the total heat exchanger 18. A first filter 19 that purifies the outside air taken in from the outside air intake port 16 is installed in the air supply passage 14 upstream of the total heat exchanger 18.

[0017] A damper 21 is installed in the partition wall 13 of the case 12 downstream of the total heat exchanger 18 in the supply air passage 14 and upstream of the total heat exchanger 18 in the exhaust air passage 15. The damper 21 allows return air from the exhaust air passage 15 to enter the supply air passage 14, where it is mixed with outside air and reused for adjusting the temperature of the outside air. A chilled / hot water coil 22 is installed downstream of the damper 21 in the supply air passage 14, and the chilled / hot water coil 22 adjusts the mixed air to a provisional supply air temperature to produce conditioned air. The provisional supply air temperature is a provisional supply air temperature that is temporarily adjusted to be closer to the set temperature of the room 5 than the target supply air temperature before being adjusted to the final target supply air temperature. A humidifier 23 that humidifies the conditioned air is installed downstream of the chilled / hot water coil 22 in the supply air passage 14, and a second filter 24 that purifies the conditioned air is installed downstream of the humidifier 23.

[0018] An intake air fan 25 is installed at the most downstream of the intake air passage 14, and a return air fan 26 is installed at the most upstream of the exhaust air passage 15. Inverter fans that can change the airflow rate are used as the intake air fan 25 and the return air fan 26. An intake air duct 31 is connected to the air outlet of the intake air fan 25, and a return air duct 32 is connected to the air inlet of the return air fan 26. The intake air duct 31 extends from the intake air fan 25 to the underfloor chamber 35, and the intake air duct 31 guides conditioned air from the air conditioner 11 toward the room 5. The return air duct 32 extends from the room inlet 6 of the side wall 4 to the return air fan 26, and the return air duct 32 guides return air from the room 5 toward the air conditioner 11.

[0019] A variable air volume device 33 that changes the volume of conditioned air sent out is installed midway through the supply air duct 31. The volume of conditioned air sent out from the air conditioner 11 to the interior zone is adjusted by the supply air fan 25 and the variable air volume device 33. The volume of return air sent out from the interior zone to the air conditioner 11 is adjusted by the return air fan 26. An underfloor chamber 35 for the interior zone (for indoor use) is installed downstream of the supply air duct 31. A mixing fan (blower) 38 that sends air from the interior zone into the underfloor chamber 35 is installed in the underfloor chamber 35. The intake port of the mixing fan 38 is exposed to the floor surface 3.

[0020] In the underfloor chamber 35, conditioned air at the provisional supply air temperature is mixed with air from the interior zone to produce conditioned air at the target supply air temperature. The target supply air temperature is the supply air temperature that is ultimately supplied to the interior zone (room 5). For example, conditioned air with a provisional supply air temperature of 16°C is mixed with air from the interior zone to produce conditioned air at the target supply air temperature of 19°C. At this time, the airflow rate of the supply air fan 25 can be reduced by the amount of air sent from the mixing fan 38 to the underfloor chamber 35. In this way, after the conditioned air is adjusted to the provisional supply air temperature by the air conditioner 11, the conditioned air is adjusted to the target supply air temperature in the underfloor chamber 35 using air from the interior zone, thereby reducing the amount of conditioned air sent by the air conditioner 11.

[0021] A mixer 36 is provided downstream of the mixing fan 38 in the underfloor chamber 35 to promote mixing of the conditioned air from the air conditioner 11 and the air in the interior zone. The mixer 36 makes it easier for the conditioned air from the air conditioner 11 and the air in the interior zone to stagnate, resulting in effective mixing. A perforated panel, for example, is used as the mixer 36. A floor outlet 37 is installed on the floor surface 3 downstream of the mixer 36, and blows conditioned air at a target supply temperature into the interior zone. The floor outlet 37 on the floor surface 3 is separated from the intake port of the mixing fan 38 to an extent that a short circuit from the floor outlet 37 to the mixing fan 38 does not occur. The interior zone is adjusted to the set temperature by the supply of conditioned air.

[0022] As described above, a portion of the air in the interior zone is sent to the underfloor chamber 35 through the mixing fan 38, and a portion of the air circulates between the interior zone and the underfloor chamber 35. The mixing fan 38 is provided with a third filter (filter) 39 that purifies the air circulating between the interior zone and the underfloor chamber 35. This allows clean air that has passed through the third filter 39 to circulate between the interior zone and the underfloor chamber 35. Furthermore, providing the mixing fan 38 in the underfloor chamber 35 makes maintenance of the mixing fan 38 and replacement of the third filter 39 easier.

[0023] In this way, the air conditioning system 10 for the interior zone reduces an increase in the airflow volume of the air conditioner 11 by reusing the air circulating between the interior zone and the underfloor chamber 35 to adjust the air conditioning temperature. This makes it possible to increase the volume of conditioned air sent from the floor outlet 37 to the interior zone without increasing the volume of air sent by the air conditioner 11. This reduces the need for an increase in the transport power of the air conditioner 11 and the duct size of the supply air duct 31. Air is sent directly to the underfloor chamber 35 by the mixing fan 38, minimizing air path resistance. This reduces pressure loss throughout the entire air supply system compared to a configuration in which the airflow volume is secured only by the supply air fan 25.

[0024] For example, in the air conditioning system 10, the amount of conditioned air sent from the air conditioner 11 to the underfloor chamber 35 is 10,000 m 3 / h], and the return air volume from the interior zone to air conditioner 11 is 10,000 [m 3 / h], and the air flow rate from the interior zone to the underfloor chamber 35 is 4000 [m 3 / h]. This allows the volume of conditioned air sent from the underfloor chamber 35 to the interior zone to be 14,000 [m 3 / h], which is a 40% increase in the volume of conditioned air compared to a configuration in which conditioned air is blown to the interior zone by only air conditioner 11. The increased volume of conditioned air ensures the capacity to handle the air conditioning load.

[0025] The supply air fan 25 is variable air volume controlled, while the mixing fan 38 is controlled to a constant air volume. When the indoor air conditioning load decreases, the variable air volume control is activated. However, when the limit of the variable air volume control is reached, the supply air temperature reset control is implemented. When this supply air temperature reset control shifts to a direction that reduces the air conditioning load processing capacity, the airflow volume of the mixing fan 38 is reduced. That is, the air conditioner 11 resets the provisional supply air temperature according to the temperature of the interior zone. When the provisional supply air temperature is reset to a direction that reduces the air conditioning load processing capacity, the airflow volume of the mixing fan 38 is reduced. For example, if the interior zone is overcooled by the conditioned air being blown, the supply air temperature reset control reduces the airflow volume of the mixing fan 38 when the air conditioner 11 resets the provisional supply air temperature to a direction that increases the temperature. Note that while only one mixing fan 38 is shown in FIG. 1 , multiple mixing fans 38 can be installed in the underfloor chamber 35 as needed, and the airflow volume is adjusted by controlling the number of mixing fans 38 that are stopped.

[0026] When the air conditioning load processing capacity of air conditioning system 10 is excessive compared to the air conditioning load, the airflow rate of mixing fan 38 is reduced to adjust the air conditioning load processing capacity. Although not shown, in order to perform supply air temperature reset control, air conditioning system 10 is provided with various sensors such as an indoor temperature sensor and a supply air temperature sensor, as well as a control unit that controls air conditioner 11. In air conditioning system 10, the airflow rate of mixing fan 38 may be reduced when the value of the temporary supply air temperature of air conditioner 11 is reset to the same value as the target supply air temperature. As with supply air fan 25, an inverter fan may be used as mixing fan 38.

[0027] The perimeter zone air conditioning system 40 differs from the interior zone air conditioning system 10 in that it can take in outside air from outside into an underfloor chamber 45. Because the air conditioning systems 40 and 10 have substantially the same configuration, only the differences will be mainly described here. An intake air duct 42 is connected to the perimeter air conditioner 41, and a variable air volume device 43 is installed midway through the intake air duct 42. An underfloor chamber 45 for the perimeter zone (indoor use) is installed downstream of the intake air duct 42. A circulation unit 51 including a circulation fan (blower) 52, a fourth filter (filter) 53, and a damper 54 is installed on floor surface 3.

[0028] The air outlet of the circulation fan 52 is connected to the underfloor chamber 45, and a damper 54 is installed at the air intake of the circulation fan 52 via a fourth filter 53. The damper 54 is configured so that the circulation fan 52 can be switched between communicating with the perimeter zone and the outdoors. When the circulation fan 52 is switched to communicating with the perimeter zone, the circulation fan 52 sends air from the perimeter zone into the underfloor chamber 45. When the circulation fan 52 is switched to communicating with the outdoors, the circulation fan 52 sends outside air into the underfloor chamber 45. The air from the perimeter zone and the outside air are purified by passing through the fourth filter 53.

[0029] In the underfloor chamber 45, conditioned air at the provisional supply temperature is mixed with perimeter zone air or outside air to create conditioned air at the target supply temperature. A mixer 46 is provided downstream of the circulation fan 52 in the underfloor chamber 45 to promote mixing of the conditioned air from the perimeter air conditioner 41 with the perimeter zone air or outside air. A floor outlet 47 is provided on the floor surface 3 downstream of the mixer 46, blowing conditioned air at the target supply temperature into the perimeter zone. The floor outlet 47 on the floor surface 3 is separated from the intake port of the circulation fan 52 to an extent that a short circuit from the floor outlet 47 to the circulation fan 52 does not occur. The perimeter zone is adjusted to the set temperature by the supply of conditioned air.

[0030] In this way, the perimeter zone air conditioning system 40 reduces the increase in the airflow volume of the perimeter air conditioner 41 by reusing the air circulating between the perimeter zone and the underfloor chamber 45 to adjust the conditioned air temperature. Furthermore, during intermittent periods, the damper 54 can be used to switch the circulation fan 52 to the outdoor side, allowing outside air to be mixed with the conditioned air instead of the perimeter zone air to produce conditioned air at the target supply temperature. This reduces the need for power for transporting air from the perimeter air conditioner 41 and the duct size of the supply air duct 42. Although not shown, the perimeter zone air conditioning system 40 is also provided with an exhaust system for exhausting indoor air.

[0031] Changes in the state of air in an air conditioning system will be described with reference to Figures 1 and 2. Figure 2 is a diagram schematically showing a psychrometric chart of changes in the state of air in the air conditioning system of the first embodiment. Note that while the state of air at each point in the air conditioning system for the interior zone will be described here, the state of air at each point in the air conditioning system for the perimeter zone is similar. In addition, the vertical axis of Figure 2 represents absolute humidity, and the horizontal axis represents dry-bulb temperature.

[0032] As shown in Figures 1 and 2, the temperature of the outdoor air at outdoor point P1 is the highest. When the outdoor air at outdoor point P1 is taken into air conditioner 11, heat is exchanged between the outdoor air and return air in total heat exchanger 18, lowering the temperature of the outdoor air. At mixing point P2 of air conditioner 11, outdoor air from the outdoors and return air from the interior zone (room 5) are mixed, and the temperature of the mixed air is brought closer to the temperature of indoor point P5. The mixed air passes through chilled / hot water coil 22 to create conditioned air, and at outlet point P3 of air conditioner 11, the conditioned air is cooled to a provisional supply air temperature (e.g., 16°C) and sent out from air conditioner 11 to supply air duct 31.

[0033] Conditioned air is sent from the air conditioner 11 to the underfloor chamber 35 via the supply air duct 31. In the underfloor chamber 35, the conditioned air is mixed with air from the interior zone by the mixing fan 38, and the conditioned air is raised to a target supply air temperature (e.g., 19°C) at the outlet point P4 of the floor outlet 37. The conditioned air at the target supply air temperature is diffused from the floor outlet 37 at a predetermined airflow rate, and the temperature at the indoor point P5 in the interior zone is adjusted to a set temperature (e.g., 26°C). Return air is then returned from the interior zone to the air conditioner 11.

[0034] As described above, according to the first embodiment of the air conditioning system 10 for the interior zone, conditioned air at the provisional supply temperature is mixed with air from the interior zone in the underfloor chamber 35 downstream of the supply air duct 31 to produce conditioned air at the target supply temperature. Conditioned air at the target supply temperature is supplied from the underfloor chamber 35 to the interior zone using the airflow rates of the air conditioner 11 and the mixing fan 38, adjusting the interior zone to the set temperature. This reduces the airflow rate of the air conditioner 11 by the amount of air sent from the interior zone to the underfloor chamber 35 by the mixing fan 38, thereby minimizing the airflow power required by the air conditioner 11 and the duct size. Furthermore, reducing the amount of conditioned air passing through the supply air duct 31 reduces pressure loss in the supply air duct 31, thereby reducing the airflow power required for the entire system. Similar effects can be achieved in the air conditioning system 40 for the perimeter zone.

[0035] In particular, with floor-air-supply air conditioning, the temperature difference between the set temperature and the target supply air temperature is smaller than with ceiling-air-supply air conditioning, so the amount of air sent into room 5 required to process the air conditioning load of room 5 must be increased. Even with this type of floor-air-supply air conditioning, the air supply volumes of air conditioner 11 and perimeter air conditioner 41 can be reduced by the amount of air supply volumes of mixing fan 38 and circulation fan 52, thereby preventing an increase in duct size.

[0036] <Second embodiment> The air conditioning system of the second embodiment will be described in detail below with reference to the accompanying drawings. Fig. 3 is a schematic diagram of the air conditioning system of the second embodiment. The air conditioning system of the second embodiment differs from the floor-air conditioning system of the first embodiment in that it is a ceiling-air conditioning system. Therefore, in the second embodiment, explanations of the same configuration as in the first embodiment will be omitted as much as possible.

[0037] As shown in Figure 3, a room 61 in the second embodiment has a double ceiling structure, and an intra-ceiling space is formed between a ceiling slab 62 and a ceiling 63. A chamber box (chamber) 85 and various ducts are installed in the ceiling. The air conditioner 71 and the chamber box 85 in the ceiling are connected by a supply air duct (duct) 81, and the side wall 64 of the room 61 and the air conditioner 71 are connected by a return air duct 82. The air conditioner 71 is configured in the same way as the air conditioner 11 in the first embodiment, and has a first filter 72, a total heat exchanger 73, a hot / cold water coil 74, a humidifier 75, a second filter 76, a supply air fan 77, a return air fan 78, and a damper 79.

[0038] The supply air fan 77 and chamber box 85 are connected by a supply air duct 81, and conditioned air is sent from the air conditioner 71 to the chamber box 85 through the supply air duct 81. The indoor air inlet 66 in the side wall 64 and the return air fan 78 are connected by a return air duct 82, and return air is drawn from the room 65 to the air conditioner 71 through the return air duct 82. A variable air volume device 83 that changes the amount of conditioned air sent out is installed midway through the supply air duct 81. A chamber box 85 is installed downstream of the supply air duct 81, and the underside of the chamber box 85 forms a ceiling outlet 86 that blows conditioned air into the room 65.

[0039] A ceiling inlet 88 that draws air from inside the room 65 is installed in the ceiling 63. The ceiling inlet 88 in the ceiling 63 is separated from the ceiling outlet 86 so that a short circuit does not occur from the ceiling outlet 86 to the ceiling inlet 88. An outside air intake 89 is installed in a side wall 64 inside the ceiling. The ceiling inlet 88 and the outside air intake 89 are connected to the chamber box 85 via a ceiling duct 91 installed inside the ceiling. The upstream side of the ceiling duct 91 is divided into a branch duct on the ceiling inlet 88 side and a branch duct on the outside air intake 89 side, and dampers 92, 93 are installed midway along each branch duct.

[0040] A fifth filter (filter) 94 and a circulation fan (blower) 95 are installed downstream of the branching point of the ceiling duct 91. Dampers 92 and 93 are formed so that the circulation fan 95 can be switched between communicating with the indoors 65 and the outdoors. When damper 92 opens and damper 93 closes, the circulation fan 95 switches its communication destination to the indoors 65 side, and air from the indoors 65 is sent to the chamber box 85. When damper 92 closes and damper 93 opens, the circulation fan 95 switches its communication destination to the outdoors side, and outside air is sent to the chamber box 85. The air from the indoors 65 and the outside air are purified by passing through the fifth filter 94.

[0041] In the chamber box 85, the air in the room 65 or the outside air is mixed with the conditioned air at the provisional supply air temperature to create conditioned air at the target supply air temperature. A mixer 87 that promotes mixing of the conditioned air from the air conditioner 71 with the air in the room 65 or the outside air is provided inside the chamber box 85, so that the air in the room 65 or the outside air is effectively mixed with the conditioned air from the air conditioner 71 in the chamber box 85. The conditioned air is supplied to the room 65 from a ceiling air outlet 86 of the chamber box 85, and the room 65 is adjusted to a set temperature. Also, as in the first embodiment, the circulation fan 95 may reduce the airflow when the provisional supply air temperature is reset by the air conditioner 71 in a direction that reduces the processing capacity of the air conditioning load.

[0042] In this way, air conditioning system 70 reduces the airflow volume of air conditioner 71 by reusing the air circulating between room 65 and chamber box 85 in the ceiling to adjust the temperature of the air conditioning. Furthermore, during intermittent periods, dampers 92 and 93 can be used to switch circulation fan 95 to the outdoors, mixing outside air with the conditioned air instead of the air from room 65 to create conditioned air at the target supply temperature. Compared to floor-air conditioning, ceiling-air-supply air conditioning has a larger temperature difference between the set temperature and the target supply air temperature, and the airflow volume is set lower. This allows for smaller power consumption for air conditioner 71 and a smaller duct size for supply air duct 81.

[0043] As described above, ceiling-discharge air conditioning is performed in the air conditioning system 70 of the second embodiment. Compared to floor-discharge air conditioning, ceiling-discharge air conditioning has a larger temperature difference between the set temperature and the target supply air temperature, so the amount of air sent to the room 65 required to process the air conditioning load of the room 65 can be reduced. Therefore, with ceiling-discharge air conditioning, the air flow rate of the air conditioner 71 can be reduced by the amount of air flow rate of the circulation fan 95, making it possible to further reduce the duct size.

[0044] In the first embodiment, air is sent directly from the room to the underfloor chamber, but room air may also be sent from the return air duct to the underfloor chamber, or from the return air duct to the supply air duct.

[0045] In the first embodiment, an underfloor chamber that utilizes the space under the floor is used as the chamber, but the shape and size of the chamber are not particularly limited. For example, the chamber may be a chamber box installed under the floor.

[0046] In the first embodiment, a filter is provided in the mixing fan serving as a blower, but the filter may be provided in any location that can purify the air circulating in the room and underfloor chamber. For example, the filter may be provided in the floor air outlet.

[0047] In addition, in the second embodiment, air is sent from inside the room to a chamber box in the ceiling, but indoor air may also be sent from the return air duct to the chamber box, or indoor air may be sent from the return air duct to the supply air duct.

[0048] In the second embodiment, a chamber box installed in the ceiling is used as the chamber, but the shape and size of the chamber are not particularly limited. For example, the chamber may be a ceiling chamber that utilizes the space in the ceiling.

[0049] In the second embodiment, a filter is provided in the ceiling duct, but the filter may be provided in any location that can purify the air circulating between the room and the chamber box. For example, the filter may be provided in the chamber box.

[0050] In addition, in the second embodiment, a ceiling inlet is formed in the chamber box, but a ceiling outlet may be installed on the ceiling and the chamber box may be connected to the ceiling outlet via a duct.

[0051] In the first and second embodiments, the conditioned air is produced from a mixture of outdoor air and indoor return air, but the conditioned air may be produced from indoor return air. In this case, a ventilation system is provided separately from the air conditioning system to exhaust indoor air from the room.

[0052] As described above, the air conditioning system (10, 40, 70) of this embodiment is an air conditioning system that adjusts the temperature of a room to a set temperature and includes an air conditioner (11, 71, perimeter air conditioner 41) that produces conditioned air conditioned to a provisional supply air temperature, a duct (air supply duct 31, 42, 81) that guides the conditioned air from the air conditioner toward the room (5, 65), a chamber (underfloor chamber 35, 45, chamber box 85) installed downstream of the duct, and a blower (mixing fan 38, circulation fan 52, 95) that sends room air to the chamber, where the conditioned air from the duct is mixed with the room air, and conditioned air at a target supply air temperature is supplied from the chamber to the room. With this configuration, the conditioned air at the provisional supply air temperature is mixed with the room air in the chamber downstream of the duct to produce conditioned air at the target supply air temperature. The air conditioning air is supplied from the chamber to the room by adjusting the airflow volume of the air conditioner and the blower, and the room temperature is adjusted to the set temperature. At this time, the airflow volume of the air conditioner can be reduced by the amount of air sent from the room to the chamber by the blower, which reduces the air conditioning airflow power and duct size. Furthermore, by reducing the amount of conditioned air passing through the duct, pressure loss in the duct is reduced, and the airflow power required for the entire system can be reduced.

[0053] In the air conditioning system of this embodiment, the chamber is provided with a mixing member (36, 46, 87) that promotes mixing of the conditioned air from the duct with the room air. With this configuration, the conditioned air from the air conditioner and the room air can be retained and mixed effectively.

[0054] The air conditioning system of this embodiment is equipped with filters (third filter 39, fourth filter 53, fifth filter 94) that purify the air circulating between the room and the chamber. With this configuration, clean air can be circulated between the room and the chamber.

[0055] In the air conditioning system of this embodiment, the air conditioner resets the provisional supply air temperature according to the room temperature, and the blower reduces the airflow when the provisional supply air temperature is reset in a direction that reduces the air conditioning load processing capacity. With this configuration, when the air conditioning load processing capacity is excessively high compared to the air conditioning load, the airflow of the blower can be reduced to adjust the air conditioning load processing capacity.

[0056] The air conditioning system of this embodiment includes dampers (54, 92, 93) that switch the communication destination of the blower between indoors and outdoors. With this configuration, outdoor air can be mixed with the conditioned air instead of indoor air to produce conditioned air at a target supply temperature.

[0057] In the air conditioning system of this embodiment, the air conditioner produces conditioned air from a mixture of outdoor air and indoor return air. This configuration allows for indoor temperature regulation and ventilation.

[0058] In the air conditioning system of this embodiment, the chamber is an underfloor chamber (35, 45), and conditioned air is blown out from the floor outlets (37, 47). With this configuration, in floor-discharge air conditioning, the temperature difference between the set temperature and the target supply air temperature is smaller than in ceiling-discharge air conditioning, and therefore the amount of air blown into the room required to handle the air conditioning load in the room must be increased accordingly. Even in such floor-discharge air conditioning, the air flow rate of the air conditioner can be reduced by the amount of air flow from the blower, thereby preventing an increase in duct size.

[0059] In the air conditioning system of this embodiment, the blower is installed in the underfloor chamber. With this configuration, the blower directly sends air from the room to the chamber, minimizing airflow resistance. Furthermore, maintenance of the blower is simplified.

[0060] In the air conditioning system of this embodiment, a chamber (chamber box 85) is provided in the ceiling, and conditioned air is blown out from the ceiling air outlet (86). With this configuration, the temperature difference between the set temperature and the target supply air temperature is larger in ceiling-discharge air conditioning than in floor-discharge air conditioning, so the amount of air blown into the room required to handle the air conditioning load in the room can be reduced. Therefore, in ceiling-discharge air conditioning, the air flow rate of the air conditioner can be reduced by the amount of air flow from the blower, thereby making it possible to further reduce the duct size.

[0061] Although the present embodiment and modifications have been described, other embodiments may be obtained by combining the above-described embodiments and modifications in whole or in part.

[0062] Furthermore, the technology of the present invention is not limited to the above-described embodiments, and may be variously changed, substituted, or modified within the scope of the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to technological advances or other derived technologies, it may be implemented using that method. Therefore, the claims cover all embodiments that may fall within the scope of the technical idea. [Explanation of symbols]

[0063] 5, 65: Indoor 10, 40, 70: Air conditioning system 11, 71: Air conditioner 31, 42, 81: Air supply duct (duct) 35, 45: Underfloor chamber (chamber) 36, 46, 87: Mixing materials 37, 47: Floor outlet 38: Mixing fan (blower) 39: Third filter (filter) 41: Perimeter air conditioner (air conditioner) 52, 95: Circulation fan (blower) 53: Fourth filter (filter) 54, 92, 93: Damper 85: Chamber box (chamber) 86: Ceiling outlet 94: Fifth Filter (Filter)

Claims

1. An air conditioning system that adjusts the temperature in a room to a set temperature, an air conditioner that produces conditioned air adjusted to a temporary supply air temperature; a duct that guides conditioned air from the air conditioner toward the room; a chamber located downstream of the duct; a blower that blows indoor air into the chamber, The conditioned air from the duct is mixed with the indoor air in the chamber, and the conditioned air at the target supply air temperature is supplied from the chamber into the room. The air conditioner resets the temporary supply air temperature according to the room temperature, An air conditioning system characterized in that the blower reduces the airflow when the temporary supply air temperature is reset in a direction that reduces the processing capacity of the air conditioning load.

2. 2. The air conditioning system according to claim 1, wherein the chamber is provided with a mixing member for promoting mixing of the conditioned air from the duct with the indoor air.

3. 3. The air conditioning system according to claim 1, further comprising a filter for purifying the air circulating in the room and through the chamber.

4. 4. The air conditioning system according to claim 1, further comprising a damper for switching the communication destination of the blower between indoors and outdoors.

5. 5. The air conditioning system according to claim 1, wherein the air conditioner produces conditioned air from a mixture of outside air and return air from inside the room.

6. 6. The air conditioning system according to claim 1, wherein the chamber is an underfloor chamber, and conditioned air is blown out from a floor outlet.

7. 7. The air conditioning system according to claim 6, wherein the blower is provided in the underfloor chamber.

8. 6. The air conditioning system according to claim 1, wherein the chamber is provided in a ceiling, and conditioned air is blown out from a ceiling outlet.

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