JP2014214936A - Air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning system having high energy efficiency as a whole.SOLUTION: An air conditioning system 1 comprises: a first air conditioner 13 conditioning air in an interior zone; and second air conditioners 14 and 15 conditioning air in the interior zone and a perimeter zone. When the second air conditioners 14 and 15 condition the air to heat the perimeter zone and the first air conditioner 13 conditions the air to cool the interior zone, a refrigerant in a refrigerant circulation pipe line R3 of the second air conditioners 14 and 15 is introduced into the first air conditioner 13 via heat recovery pipe lines L51 and L52 to implement heat exchange with waste heat of the refrigerant in the first air conditioner 13, and returned to the refrigerant circulation pipe line R3 of the second air conditioners 14 and 15, thereby carrying out heat recovery from the waste heat.

Description

  The present invention relates to an air-conditioning system that divides an air-conditioning target space into a space where the atmospheric thermal influence is small and a space where the atmospheric thermal influence is large and air-conditions each space.

  The indoor space of a building such as a recent office building is close to the outer wall or window of the room and is greatly affected by the atmospheric thermal effect, such as the so-called perimeter zone and the center of the indoor environment. It can be divided into small spaces, so-called interior zones. In the interior zone, although there is little thermal influence of the atmosphere, in addition to the presence of office workers, various types of office equipment or lighting equipment such as lighting equipment are installed. The thermal impact from the equipment is significant.

  Therefore, for example, as described in Patent Document 1, there is one in which a room is divided into an interior zone and a perimeter zone, and each of these zones can be air-conditioned (zone air-conditioning) using a radiation panel.

International Publication Number WO2009 / 044855

  However, in such zone air conditioning, the air conditioning in the perimeter zone requires heating, and conversely, when the air conditioning in the interior zone requires cooling, the waste heat of the air conditioning system in the interior zone is not utilized, There is a problem of low energy efficiency.

  The present invention has been made to solve the above-mentioned problems, and is capable of recovering heat as a heat source during heating and air conditioning in the perimeter zone so that the exhaust heat during cooling and air conditioning in the interior zone can be recovered. It aims to provide an air conditioning system with improved performance.

  (1) In order to achieve the object, an air conditioning system according to the present invention includes a first air conditioner that air-conditions an interior zone, and a second air conditioner that air-conditions at least a perimeter zone, and the second air conditioner includes When the perimeter zone is heated and air-conditioned, and the first air conditioner is cooling and air-conditioning the interior zone, the refrigerant in the refrigerant circulation piping system of the second air conditioning device is passed through the heat recovery piping system. After introducing into the first air conditioner and exchanging heat with the exhaust heat of the refrigerant in the first air conditioner, returning it to the refrigerant circulation piping system of the second air conditioner, It is characterized in that heat recovery is performed.

  According to the present invention, heat released during cooling air conditioning in the interior zone can be recovered as a heat source during heating air conditioning in the perimeter zone, so that the overall energy efficiency can be improved.

  (2) In a preferred embodiment of the present invention, the refrigerant circulation piping system of the second air conditioner and the refrigerant circulation piping system of the radiant panel in the zone are connected in series via a heat exchanger for indirect heat exchange. It has become a piping system. According to this embodiment, it is not necessary to use separate piping systems for loads having different refrigerant temperature ranges, for example, the humidity controller and the radiating panel, and the piping cost can be reduced.

  (3) In a more preferred embodiment of the present invention, in (2), the refrigerant circulation piping system of the second air conditioner is a large temperature difference water supply piping system. According to this embodiment, since the refrigerant flow rate in the refrigerant circulation piping system of the second air conditioner is reduced, the radiant panel that requires a large flow rate of refrigerant, and the humidity controller that requires a small flow rate of refrigerant Can be made into the same piping system, and piping cost can be reduced.

  (4) In a more preferred embodiment of the present invention, in (2), the refrigerant circulation piping system of the second air conditioner is an atmospheric pressure piping system. According to this embodiment, there is no need to interpose a vacuum pump in the refrigerant circulation piping system of the second air conditioner, and the operating cost of the system is reduced.

  (5) In a more preferred embodiment of the present invention, in (2), the refrigerant circulation piping system of the radiating panel is a vacuum pressure piping system. According to this embodiment, it is possible to prevent water from leaking from the radiation panel.

  According to the present invention, heat released during cooling air conditioning in the interior zone can be recovered as a heat source during heating air conditioning in the perimeter zone, so that the overall energy efficiency can be improved.

FIG. 1 is a diagram showing a configuration of an air conditioning system according to an embodiment of the present invention. FIG. 2 is a schematic circuit diagram of the inside of the first air conditioner of FIG. FIG. 3 is a diagram for explaining an operation in the air conditioning system according to the embodiment of the present invention when the air conditioning of the interior zone and the perimeter zone is performed by the second air conditioner in a state where the operation of the first air conditioner is stopped. FIG. 4 is a diagram for explaining an operation in the air conditioning system according to the embodiment of the present invention when the perimeter zone is heated and air-conditioned by the second air conditioner and the interior zone is cooled and air-conditioned by the first air conditioner.

  Hereinafter, an air conditioning system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a configuration diagram of an air conditioning system 1 according to an embodiment of the present invention. As shown by the vertical two-dot chain line in the figure, the section A in the figure is a floor in the building, and the section B in the figure is a machine room in the building. There is an air-conditioning zone C in the floor A. The air conditioning zone C is divided into an interior zone and a perimeter zone. The interior zone is provided with the first radiation panel 2 on its ceiling surface or wall surface, and the perimeter zone has its wall surface or ceiling surface. Etc., the second radiation panel 3 is installed.

  The first and second radiating panels 2 and 3 are shown as blocks in the drawing and simplified. The first and second radiating panels 2 and 3 are generally composed of a bent refrigerant pipe and a radiating plate that receives heat from water flowing through the refrigerant pipe and radiates the heat. This is a panel that can perform so-called radiant air conditioning such as air conditioning and air conditioning by directly exchanging radiant heat with devices and the like.

  However, the 1st, 2nd radiation panels 2 and 3 are not limited to this, The panel which can perform air-conditioning by performing a radiant heat exchange directly with the air | atmosphere etc. in a zone with a refrigerant | coolant. If it is.

  In addition to the first radiating panel 2 and the second radiating panel 3, the floor A includes first and second heat exchangers 4 and 5, first and second sealed tanks 6 and 7, first and second vacuum pumps 8. , 9, first and second transport pumps 10, 11 and a humidity controller 12 are provided. The machine room B is provided with first to third air conditioners 13 to 15, an open tank 16, and third to fifth transfer pumps 17 to 19.

  The building to which the air-conditioning system 1 of the present embodiment is applied may have any number of floors, but can be applied to a building having at least a plurality of floors. Zone air-conditioning is performed on the interior zone and the perimeter zone in the floor A of each floor by the first to third air conditioners 13 to 15 in the machine room B.

  FIG. 1 shows an arbitrary floor A among floors A of each floor and a machine room B that performs zone air conditioning on the floor A of each floor, but the first to third air conditioners of the machine room B are shown. 13 to 15 controls the zone air conditioning of the floor A of each floor. Therefore, the floor A of each floor has first and second heat exchangers 4 and 5, first and second in addition to the first radiating panel 2 and the second radiating panel 3 as shown in the floor A of FIG. 1. Each air-conditioning equipment of the sealed tanks 6 and 7, the first and second vacuum pumps 8 and 9, the first and second transport pumps 10 and 11, and the humidity controller 12 is provided.

  In each of these facilities, each air conditioner is arranged in the horizontal direction on each floor A, and each air conditioner is arranged in the machine room B in the vertical direction as the floor A direction on each floor. It has become.

  In any one floor A of the floors of each floor, the first heat exchanger 4 is an indirect heat exchanger having a primary side 4a and a secondary side 4b. The primary side 4a of the first heat exchanger 4 is connected to a first air conditioner 13 composed of an air-water cooled heat pump via pipes L11 and L12, and the first refrigerant circulation piping system R1 is connected together with the first air conditioner 13. Configure.

  In the refrigerant circulation piping system described later, including the first refrigerant circulation piping system R1, water refrigerant is used as the refrigerant.

  In the first refrigerant liquid circulation piping system R1, the refrigerant is supplied from the refrigerant outlet 13b of the first air conditioner 13 to the primary side 4a of the first heat exchanger 4 through the outgoing pipe L12, as indicated by arrows in the drawing. After the indirect heat exchange between the primary side 4a and the secondary side 4b, the power of the third transport pump 17 returns the refrigerant from the return pipe L11 to the refrigerant inlet 13a of the first air conditioner 13.

  One of the secondary side 4b of the 1st heat exchanger 4 goes out from the pipe confluence | merging part G1 with the outgoing piping L21 and the outgoing piping L43 which the 1st airtight tank 6 with the 1st vacuum pump 8 and the 1st conveyance pump 10 interpose. It is connected to the refrigerant inlet 2a of the first radiating panel 2 via a pipe L43a. The other of the secondary side 4b of the 1st heat exchanger 4 is connected to the refrigerant | coolant exit 2b of the 1st radiation | emission panel 2 via the return piping L44a from the piping junction G2 with the return piping L22 and the piping L44.

  The secondary side 4b of the first heat exchanger 4 constitutes the second refrigerant circulation piping system R2 together with the first radiation panel 2. In the second refrigerant circulation piping system R2, as indicated by the arrows in the figure, the refrigerant flows from one side of the secondary side 4b of the first heat exchanger 4 to the outgoing piping L21, the outgoing piping L43 by the power of the first transfer pump 10. After the heat exchange for the air conditioning of the interior zone is performed in the first radiating panel 2, the first radiation is supplied to the refrigerant inlet 2a of the first radiating panel 2 via the pipe joining portion G1 and the outgoing pipe L43a. The refrigerant is returned from the refrigerant outlet 2b of the panel 2 to the other secondary side 4b of the first heat exchanger 4 via the return pipe L44a, the pipe junction G2 and the return pipe L22.

  The second refrigerant circulation piping system R2 is configured as a vacuum pressure piping system by reducing the pressure of the first closed tank 6 by the first vacuum pump 8. This prevents the refrigerant from leaking from the first radiating panel 2 to the interior zone.

  The second heat exchanger 5 is an indirect heat exchanger having a primary side 5a and a secondary side 5b. The primary side 5a of the second heat exchanger 5 is connected to the second air conditioners 14 and 15 formed of an air-cooled heat pump via pipes L31 to L36, and together with the second air conditioners 14 and 15, the third refrigerant A circulation piping system R3 is configured.

  In the third refrigerant circulation piping system R3, in addition to the second air conditioners 14 and 15 connected in series, a humidity controller 12, an open tank 16, and a fifth transport pump 19 are interposed. In the third refrigerant circulation piping system R3, the refrigerant circulates through the forward and return pipes L31 to L36 by the power of the fifth transfer pump 19 as shown by the arrows in the figure, and is larger by the open tank 16. It is considered as a pneumatic piping system.

  The humidity controller 12 adjusts the humidity in the building to a desired value. An example of the humidity controller 12 includes a refrigerant coil through which a refrigerant (not shown) passes and a humidifier. In the humidity controller 12, when dehumidifying, the humidifier is not operated, and when a low-temperature refrigerant is supplied to the refrigerant coil, the refrigerant coil functions as a cooling coil to exchange heat between the refrigerant and the air in the building. When the air is condensed and dehumidified by condensing moisture in the air on the surface of the refrigerant coil, a high-temperature refrigerant is supplied to the refrigerant coil, and the refrigerant coil is used as a heating coil. Water vapor is added to the water.

  One side of the secondary side 5b of the second heat exchanger 5 is connected to a refrigerant forward pipe L41. The forward piping L41 branches at the piping branch portion B1 into a forward piping L43 on the first radiation panel 2 side and a forward piping L42 on the second radiation panel 3 side. The forward piping L43 merges with the forward piping L21 and L43a at the piping junction G1. The forward piping L43a is connected to the refrigerant inlet 2a of the first radiating panel 2, and the forward piping L42 is connected to the refrigerant inlet 3a of the second radiating panel 3.

  The refrigerant outlet 2b of the first radiating panel 2 and the refrigerant outlet 3b of the second radiating panel 3 are connected to return pipes L44a and L45, respectively. The return pipe L44a is joined to the return pipe L22 and the return pipe L44 at the pipe junction G2. The return pipe L44 and the return pipe L45 are further joined to the return pipe L46 at the pipe junction G3. A second sealed tank 7 with a vacuum pump 9 and a second transfer pump 11 are interposed in the return pipe L46. The return pipe L <b> 46 is connected to the other secondary side 5 b of the second heat exchanger 5.

  The secondary side 5b of the second heat exchanger 5 and the first radiating panel 2 and the second radiating panel 3 constitute a fourth refrigerant circulation piping system R4. In the fourth refrigerant circulation piping system R4, as indicated by the arrows in the figure, the refrigerant undergoes indirect heat exchange between the primary side 5a and the secondary side 5b of the second heat exchanger 5, and then the secondary From one side of the side 5b, the refrigerant is diverted from the outgoing pipe L41 to the outgoing pipes L42 and L43. The refrigerant is supplied to the refrigerant inlet 2 a of the radiating panel 2.

  The refrigerant supplied to the first radiating panel 2 exchanges heat for air conditioning in the interior zone within the first radiating panel 2, and then is discharged from the refrigerant outlet 2b of the first radiating panel 2 to the return pipe L44a.

  The refrigerant supplied to the second radiant panel 3 exchanges heat for air conditioning of the perimeter zone in the second radiant panel 3, and then returns from the refrigerant outlet 3b of the second radiant panel 3 to the return pipe L45 and the return pipe. It is returned to the other secondary side 5b of the second heat exchanger 5 via L46.

  The fourth refrigerant circulation piping system R4 is configured as a vacuum pressure piping system by reducing the pressure of the second sealed tank 7 by the second vacuum pump 9. Thereby, it is prevented that the refrigerant leaks from the first radiating panel 2 and the second radiating panel 3 to the interior zone and the perimeter zone.

  Here, the second refrigerant circulation piping system R2 and the fourth refrigerant circulation piping system R4 are both vacuum pressure piping systems, but since they are in the same floor A, the second refrigerant circulation piping system R2 and the fourth refrigerant circulation piping system R4 are evacuated. The driving power of each of the first vacuum pump 8 and the second vacuum pump 9 is reduced.

  As described above, the first air conditioner 13 is composed of an air-water cooling heat pump. As shown in FIG. 2, the first air conditioner 13 includes a first water-cooled heat exchanger 131, a second water-cooled heat exchanger 132, an air-cooled heat exchanger 133, and a refrigerant circuit 134. The first water-cooled heat exchanger 131 is connected to the refrigerant inlet 13a and the refrigerant outlet 13b. The second water-cooled heat exchanger 132 is connected to the refrigerant inlet 13c and the refrigerant outlet 13d.

  The refrigerant circuit 134 includes three-way valves 134a and 134b, a four-way valve 134c, an expansion valve 134d, and a compressor 134e, and includes these heat exchangers 131 to 133 and is connected as shown in the figure by a pipe. 134b and the four-way valve 134c, the required refrigeration cycle is switched.

  During normal cooling operation, the second and third air conditioners 14 and 15 are cooled to air-condition the perimeter zone and the interior zone, and the first air conditioner 13 is shut down to perform normal heating operation. At the time, the second and third air conditioners 14 and 15 are operated to be heated and air-conditioned in the perimeter zone, and the first air conditioner 13 is cooled and air-conditioned in the interior zone.

  When the first and second air conditioners 13 and 15 perform normal air-conditioning in the interior zone by the cooling operation, the first air-conditioning apparatus 13 includes the air-cooling. Operation without using the heat exchanger 133 of the type, that is, the first air conditioner 13 that is an air-water cooling heat pump is operated by water cooling.

  However, in extreme heat, when the cooling load becomes excessive only by the normal cooling operation of the second and third air conditioners 14 and 15, in the first air conditioner 13, one water-cooled heat exchanger 131 is provided. In addition, the air-cooling operation using the air-cooling heat exchanger 133, that is, the first air conditioner 13 that is an air-water cooling heat pump may be air-cooled.

  On the other hand, when the heating load becomes excessive only during normal heating operation of the second and third air conditioners 14 and 15 in severe cold, the other water-cooled heat exchanger 132 is used in the first air conditioner 13. And the air-cooled heat exchanger 133 may be used for heating operation, that is, the first air conditioner 13 that is an air-water cooling heat pump may be air-cooled for heating operation.

  The first heat recovery pipe L51 is interposed with the fourth transfer pump 18, and is connected to the return pipe L32 in the third refrigerant circulation pipe system R3 through the pipe connection portion B2. That is, the return pipe L32 is branched into the first heat recovery pipe L51 and the return pipe L32a at the pipe connection portion B2.

  As a result, in the third refrigerant circulation piping system R3, a part of the refrigerant flowing through the pipe L32 from the open tank 16 is first recovered by the fourth transfer pump 18 at the pipe connection portion B2, as indicated by the arrow in the figure. The refrigerant is supplied to the refrigerant inlet 13c of the first air conditioner 13 through the pipe L51, and the remaining part is supplied to the downstream return pipe L32a by the fifth transport pump 9 as shown by the arrow in the drawing at the connection B2. Is done.

  A second heat recovery pipe L52 is connected to the refrigerant outlet 13d of the first air conditioner 13. The refrigerant introduced into the refrigerant inlet 13c of the first air conditioner 13 is exchanged with the heat generated during the cooling operation of the first air conditioner 13, and then discharged from the refrigerant outlet 13d to the second heat recovery pipe L52. Is done.

  The second heat recovery pipe L52 merges with the forward pipe L35 in the third refrigerant circulation pipe system R3 as shown by the arrow in the drawing at the junction G4, and the refrigerant discharged from the second heat recovery pipe L52 is The merged portion G4 merges with the refrigerant from the forward pipe L35, and the merged refrigerant is supplied to the humidity controller 12 from the pipe L35a in the third refrigerant circulation pipe system R3.

  As described above, the first air conditioner 13 performs the cooling operation when the second air conditioners 14 and 15 perform the normal heating operation, and the second and third air conditioners 14 and 15 perform the normal cooling operation. At times, stop driving. During the cooling operation of the first air conditioner 13, a low-temperature refrigerant is supplied from the outgoing pipe L12 to the primary side 4a of the first heat exchanger 4.

  And the refrigerant | coolant of the primary side 4a which heat-exchanged between the primary side 4a and the secondary side 4b of the 1st heat exchanger 4 and became high temperature by heat absorption is returned to the 1st air conditioning from the return piping L11 by the 3rd conveyance pump 17. Returned to device 13.

  As described above, a part of the refrigerant in the third refrigerant circulation piping system R3 is heat-exchanged by the first air conditioner 13, and returned to the third refrigerant circulation piping system R3.

  Next, operation | movement of the air conditioning system 1 of embodiment is demonstrated with reference to FIG.3 and FIG.4. FIG. 3 is a diagram for explaining an operation when air-conditioning the interior zone and the perimeter zone. FIG. 4 is a diagram for explaining the operation when the interior zone is air-conditioned and the perimeter zone is heated and air-conditioned.

  Referring to FIG. 3, in the air conditioning system 1 of the embodiment, when performing cooling air conditioning on the interior zone and the perimeter zone, the first air conditioner 13 is stopped and only the second air conditioners 14 and 15 are cooled. In operation, both zones are air-conditioned.

  In this cooling air conditioning, since the first air conditioner 13 stops operating, for the convenience of understanding the explanation of the operation, in FIG. 3, the first and second refrigerant circulation piping systems R1, R2, 1 air conditioner 13, the 1st heat exchanger 4, and others are shown with the broken line.

  In the cooling operation of the second air conditioners 14 and 15, in the embodiment, as an example, the refrigerant temperature difference (21 ° C.−) between the refrigerant inlet 14a and the refrigerant outlet 14b of the second air conditioner 14 in the third refrigerant circulation piping system R3. 11 ° C.) and the sum of the refrigerant temperature difference (11 ° C.−6 ° C.) between the refrigerant inlet 15a and the refrigerant outlet 15b of the second air conditioner 15 is a large temperature difference of 15 ° C., and the third refrigerant circulation piping system R3 It has a large temperature difference water supply piping system.

  As a result, the amount of heat supplied is constant, and the refrigerant temperature is a large temperature difference, whereby the flow rate of the refrigerant in the third refrigerant circulation piping system R3 is reduced. For example, the refrigerant flow rate is 22 liters per minute. The conveyance power of the fifth conveyance pump 19 that conveys the pressure is reduced, and the power consumption required for driving the fifth conveyance pump 19 can be suppressed.

  When the second air conditioners 14 and 15 perform the cooling operation, one of the second air conditioners 14 heats the refrigerant when the medium temperature (for example, 21 ° C.) refrigerant is supplied from the return pipe L33 to the refrigerant inlet 14a. By replacement, the refrigerant is discharged as a low-temperature (for example, 11 ° C.) refrigerant from the refrigerant outlet 14b to the outgoing pipe L34.

  The other second air conditioner 15 uses the low-temperature refrigerant supplied from the second air-conditioner 14 to the refrigerant inlet 15a via the forward pipe L34 as a low-temperature (for example, 6 ° C.) refrigerant by heat exchange. To the outgoing pipe L35. Therefore, also in the above large temperature difference water supply piping system, the second air conditioners 14 and 15 are connected in series, so that the temperature of the refrigerant temperature during the normal cooling operation of each of the second air conditioners 14 and 15 is small. As a result, the cooling operation load is reduced.

  Since the length of the outgoing pipe L35a is long from the machine room B to the floor A of each floor, the humidity controller 12 is supplied with a refrigerant that has been heated from 6 ° C to 7 ° C. The wet machine 12 discharges the refrigerant after adjusting the required humidity with this refrigerant. The temperature of the discharged refrigerant is further increased, for example, 10 ° C. This refrigerant is supplied to the primary side 5a of the second heat exchanger 5 via the pipe L36.

  In the second heat exchanger 5, heat is exchanged between the refrigerant supplied from the humidity controller 12 to the primary side 5a and the refrigerant in the secondary side 5b. On the secondary side 5b, the refrigerant is returned to the refrigerant inlet from the return pipe L46, for example, 23 ° C., and the heat exchange between the primary side 5a and the secondary side 5b causes, for example, 20 ° C. from the refrigerant outlet on the secondary side 5b. The refrigerant is supplied to the forward pipe L41.

  The secondary side 5b of the second heat exchanger 5 is in the fourth refrigerant circulation piping system R4, and the fourth refrigerant circulation piping system R4 has a large refrigerant flow rate in the first radiation panel 2 and the second radiation panel 3, In the embodiment, for example, 70 liters per minute. The refrigerant supplied from the secondary side 5b of the second heat exchanger 5 to the outgoing pipe L41 is further divided by the outgoing pipes L43 and L42, and the refrigerant inlets of the first radiating panel 2 and the second radiating panel 3 respectively. 2a and 3a.

  The first radiating panel 2 and the second radiating panel 3 perform heat exchange between the supplied refrigerant and the air in the interior zone and the perimeter zone, thereby cooling and air-conditioning the interior zone and the perimeter zone.

  By this heat exchange, the refrigerant flowing inside each of the first radiant panel 2 and the second radiant panel 3 is heated by the heat exchange, and is returned from the refrigerant outlet 2b to the return pipes L44a and L44 as, for example, a 23 ° C. refrigerant. The refrigerant is discharged and discharged from the refrigerant outlet 3b to the return pipe L45 as a 23 ° C. refrigerant. The discharged refrigerant is merged into the pipe L46 at the junction G3, and is conveyed by the second conveyance pump 11 through the sealed tank 7, and the refrigerant at 23 ° C. enters the refrigerant inlet on the secondary side 5b of the second heat exchanger 5. Returned as

  Since the fourth refrigerant circulation piping system R4 is a vacuum pressure piping system by the closed tank 7, water does not leak from the first radiating panel 2 and the second radiating panel 3 to the interior zone or the perimeter zone.

  Referring to FIG. 4, in the air conditioning system 1, when the perimeter zone is heated and air-conditioned, the second air conditioners 14 and 15 are heated and the interior zone is air-conditioned by the cooling operation of the first air conditioner 13. In FIG. 3, pipes L43, L44a, and L44 have valves (not shown) closed as indicated by broken lines, so that refrigerant is not supplied from the second heat exchanger 5 to the first radiation panel 2. ing.

  In the embodiment, when performing cooling operation of the second air conditioners 14 and 15, the first air conditioner 13 is stopped and only the second air conditioners 14 and 15 are used to perform the first radiating panel 2 and the second radiating panel 3. Thus, when the air conditioning of the interior zone and the perimeter zone is performed and the second air conditioners 14 and 15 are heated, the perimeter zone is heated and air conditioned by the second radiating panel 3 while the first air conditioner 13 is cooled. The interior zone is cooled and air-conditioned by the first radiating panel 2.

  As described above, in the heating operation of the second air conditioners 14 and 15, when a high-temperature refrigerant of, for example, 32.5 ° C. is supplied from the return pipes L32 and L32a to the second air conditioner 14, the second refrigerant is The air conditioner 14 further discharges the refrigerant as a high-temperature refrigerant of 41 ° C., for example, to the forward pipe L34.

  The other second air conditioner 15 discharges the refrigerant supplied from the second air conditioner 14 via the outgoing pipe L34 to the outgoing pipe L35 as a high-temperature refrigerant of 46 ° C., for example. The humidity controller 12 adjusts the humidity using the 45 ° C. refrigerant supplied from the outgoing pipes L35 and L35a, and discharges, for example, 43 ° C. refrigerant to the outgoing pipe L36. This refrigerant is supplied to the primary side 5 a of the second heat exchanger 5.

  In the third refrigerant circulation piping system R3, since the refrigerant temperature difference between the refrigerant inlet 14a of the second air conditioner 14 and the refrigerant outlet 15b of the second air conditioner 15 is large, the refrigerant flow rate is the same as in FIG. As little as 22 liters, the conveyance power of the conveyance pump 19 can be reduced, and the power consumption can be reduced.

  In the second heat exchanger 5, heat is exchanged between the refrigerant supplied to the primary side 5a in the third refrigerant circulation piping system R3 and the refrigerant in the secondary side 5b in the fourth refrigerant circulation piping system R4. To do. On the secondary side 5b, for example, a refrigerant at 23 ° C. is returned to the refrigerant inlet, and is supplied from the refrigerant outlet on the secondary side 5b to the outgoing pipe L41 as, for example, a refrigerant at 26 ° C. by the heat exchange.

  In this case, the flow rate of the refrigerant in the fourth refrigerant circulation piping system R4 is 70 liters per minute, as in FIG. 2, and the first radiating panel 2 cools and air-conditions the interior zone, and the second radiating panel 3 performs the perimeter zone. The flow rate is necessary for heating and air-conditioning.

  The refrigerant supplied to the forward pipe L41 is supplied to the refrigerant inlet 3a of the second radiation panel 3 via the branched forward pipe L42. The second radiating panel 3 exchanges heat with the air in the perimeter zone or the like by the refrigerant supplied to the refrigerant inlet 3a.

  Thereby, the inside of the perimeter zone is heated and air-conditioned. The refrigerant flowing inside the second radiating panel 3 is cooled by the heat exchange and discharged from the refrigerant outlet to the return pipe L45 as a refrigerant at 23 ° C., for example. The discharged refrigerant is further transported by the transport pump 11 from the return pipe L46 through the sealed tank 7, and returned to the coolant inlet of the primary side 5a of the second heat exchanger 5 as a 23 ° C. coolant.

  On the other hand, the 1st air conditioner 13 is air-cooled, and supplies 13 degreeC refrigerant | coolant, for example to the refrigerant | coolant inlet of the primary side 4a of the 1st heat exchanger 4 via the going-out piping L12. The first heat exchanger 4 exchanges heat between the refrigerant supplied to the primary side 4a and the refrigerant supplied to the secondary side 4b. The refrigerant supplied to the primary side 4a The temperature of the refrigerant is increased to 16 ° C., and the refrigerant is returned from the refrigerant outlet to the return pipe L11 by the transport pump 17.

  On the secondary side 4b of the first heat exchanger 4, the 23 ° C. refrigerant supplied to the refrigerant inlet is cooled by the heat exchange and discharged as a 20 ° C. refrigerant from the refrigerant outlet to the outgoing pipe L21. The refrigerant at 20 ° C. discharged from the outgoing pipe L21 is supplied to the refrigerant inlet 2a of the first radiating panel 2, whereby the first radiating panel 2 cools and air-conditions the interior zone.

  During the heating operation of the second air conditioners 14 and 15 and the cooling operation of the first air conditioner 13, the refrigerant that has been heated to 16 ° C. is returned to the first air conditioner 13. In this state, a part of the refrigerant conveyed by the conveyance pump 18 from the forward piping L32 in the third refrigerant circulation piping system R3 is transferred to the first air conditioner 13 via the first heat recovery piping L51 by the conveyance pump 18. Thus, the refrigerant is conveyed, and heat exchange is performed between the refrigerant returned in the first refrigerant circulation piping system R1 and the refrigerant introduced through the first heat recovery piping L51.

  By this heat exchange, for example, a 45 ° C. refrigerant is discharged from the first air conditioner 13 to the second heat recovery pipe L52, and the discharged refrigerant is sent to the outgoing pipes L35, L35a and the second refrigerant circulation pipe system R3. It is returned to the confluence portion G4 of the heat recovery pipe L52. Thereby, the heat of the refrigerant generated in the cooling operation of the first air conditioner 13 can be used as exhaust heat for raising the temperature of the refrigerant during the heating operation of the second air conditioners 14, 15. As a result, power saving of 15 is possible, and an efficient air conditioning system is obtained.

  In this case, while the heating load in the perimeter zone is small, the control device (not shown) monitors the heating state in the perimeter zone so that the amount of exhaust heat from the first air conditioner 13 does not become excessive. It is preferable to control the amount of exhaust heat from the.

  In the embodiment, the third refrigerant circulation piping system R3 and the fourth refrigerant circulation piping system R4 and the fourth refrigerant circulation piping system R4 are connected via the second heat exchanger 5, so that the third refrigerant circulation piping system R3 and the fourth refrigerant circulation piping are connected. The system R4 is a piping system connected in series.

  For this reason, the third refrigerant circulation pipe system R3 is provided with a humidity controller 12 in which the required temperature range of the refrigerant is, for example, about 7 ° C. in the normal cooling operation and 45 ° C. in the normal heating operation, for example. Even if the system R4 has the first radiating panel 2 and the second radiating panel 3 in which the required temperature zone of the refrigerant is about 26 ° C. in the heating operation of the second air conditioners 14 and 15 and about 20 ° C. in the cooling operation, for example, It is not necessary to use the humidity controller 12, the first radiating panel 2, and the second radiating panel 3 as separate piping systems as in the prior art, and the piping cost can be reduced.

  Further, in the embodiment, since the piping system connected in series is used, in the third refrigerant circulation piping system R3, as described above, the refrigerant temperature and the refrigerant at the refrigerant inlet 14a of the second air conditioners 14 and 15 are used. While the difference between the temperature of the refrigerant at the outlet 15b is a large temperature difference and the flow rate of the refrigerant is reduced, the interior zone of the first radiating panel 2 and the second radiating panel 3 in the fourth refrigerant circulation piping system R4. Even if the refrigerant is required to have a large flow rate by air conditioning with the perimeter zone, it is not necessary to use separate piping specifications as in the prior art, and the piping cost can be reduced.

  Furthermore, in the embodiment, since the third refrigerant circulation piping system R3 is an atmospheric pressure piping system, for example, there is a floor on each floor in a high building, and a radiant panel is installed in the fourth refrigerant water circulation piping system R4 on the floor of each floor. In the case of zone air conditioning, since the third refrigerant circulation piping system R3 is an atmospheric pressure piping system, it is not necessary to interpose a vacuum pump in the third refrigerant water circulation piping system R3, and the operation cost of the entire system is reduced.

  Further, in the embodiment, since the second and fourth refrigerant circulation piping systems R2 and R4 are vacuum pressure piping systems, the refrigerant in these refrigerant circulation piping systems R2 and R4 is the first radiating panel 2 and the perimeter in the interior zone. It is possible to prevent water from leaking from the second radiant panel 3 in the zone.

  Furthermore, in the embodiment, the third refrigerant circulation piping system R3 is an atmospheric pressure piping system, the second and fourth refrigerant circulation piping systems R2 and R4 are vacuum pressure piping systems, and the third refrigerant circulation piping system R3 Since the second and fourth refrigerant circulation piping systems R2 and R4 are connected via the second heat exchanger 5, the third refrigerant circulation piping system R3 and the second and fourth refrigerant circulation piping systems R2 and R4 are connected. Conditions such as the flow rate and temperature of each refrigerant can be set individually.

  The first air conditioner 13 is an air-water cooled heat pump, and the second air conditioners 14 and 15 are water-cooled heat pumps. However, the present invention is not limited to this.

  As described above, in the present embodiment, during the heating operation of the second air conditioners 14 and 15, the exhaust heat generated during the cooling operation of the first air conditioner 13 can be recovered and used for the heating operation. Can be realized.

  In the embodiment, the 45 ° C. refrigerant is returned to the merging portion G4 from the first air conditioner 13 through the second heat recovery pipe L52, but the returned portion is not limited to this. As long as it is in the piping of the third refrigerant circulation piping system R3, any piping portion may be used.

DESCRIPTION OF SYMBOLS 1 Air conditioning system 2 1st radiation panel 3 2nd radiation panel 4 1st heat exchanger 5 2nd heat exchanger 13 1st air conditioner 14,15 2nd air conditioner L51, L52 Heat recovery piping

Claims (5)

A first air conditioner for air conditioning the interior zone;
A second air conditioner for air-conditioning at least the perimeter zone,
When the second air conditioner heats and air-conditions the perimeter zone and the first air conditioner cools and air-conditions the interior zone, the refrigerant in the refrigerant circulation piping system of the second air conditioner is heated. The refrigerant is introduced into the first air conditioner through the recovery piping system, and is exchanged with the exhaust heat of the refrigerant in the first air conditioner, and then returned to the refrigerant circulation piping system of the second air conditioner. An air conditioning system characterized in that heat recovery of the exhaust heat is performed.   The refrigerant circulation piping system of the second air conditioner and the refrigerant circulation piping system of the radiation panel provided in the zone are connected in series via a heat exchanger for indirect heat exchange. Item 2. The air conditioning system according to Item 1.   The air conditioning system according to claim 2, wherein the refrigerant circulation piping system of the second air conditioner is a large temperature difference water supply piping system.   The air conditioning system according to claim 2, wherein the refrigerant circulation piping system of the second air conditioning device is an atmospheric pressure piping system.   The air conditioning system according to claim 2, wherein the refrigerant circulation piping system of the radiation panel is a vacuum pressure piping system.

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