JP2005061699A - Air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioning system using heat stored in a heat storage tank as efficiently as possible at least when a heat exchanger system is independently operated. <P>SOLUTION: A heat source side system 20 which consists of a heat source equipment system 20a and a heat exchanger system 20b for creating heat source water of a preset temperature with a heat source equipment 21a and a heat exchanger 21b and a load side system 10 in which a load side equipment 14 is installed for treating an air conditioning load using the heat source water of the preset temperature created by the heat source side system 20 are mutually connected via an outward header 31 and a homeward header 32. The outward header 31 and the homeward header 32 are mutually connected via a bypass pipe 33. When the heat exchanger system 20b is operated, a PLC 40 changes the rotating speed of a heat exchanger primary pump 22b to control the flow rate of water to be delivered to the heat exchanger system 20b so that the flow rate of water to be delivered to the load side system 10 corresponds to that to be delivered to the heat source side system 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  This invention relates to heat source water having a predetermined temperature generated by a heat exchanger using heat source water having a predetermined temperature generated by a constant flow type heat source device such as a refrigerator or heat stored in a heat storage medium stored in a heat storage tank. The present invention relates to an air conditioning system that cools and heats buildings and the like by supplying to a load side device such as an air conditioner.

  An example of this type of air conditioning system is shown in FIG. As shown in the figure, the air conditioning system includes a heat source side system 50 that generates heat source water of a predetermined temperature (for example, cold water at 7 ° C.), and heat source water of a predetermined temperature generated by the heat source side system 50. A load side system 60 in which a load side device 61 such as an air conditioner for processing an air conditioning load is installed, and the heat source side system 50 and the load side system 60 use the forward header SH and the return header RH. Are connected to each other.

  The heat source side system 50 has heat held by a heat source device system 50a in which a constant flow type heat source device 51a such as a refrigerator and a primary pump 52a are installed, and a heat storage medium (water) stored in a heat storage tank 53. A heat exchanger 51b that generates heat source water at a predetermined temperature and a heat exchanger system 50b in which a constant flow type primary pump 52b is installed, and according to the air conditioning load, the heat source equipment system 50a And the start / stop control of the heat exchanger system 50b is performed.

  Further, the heat storage medium stored on the heat storage side in the heat storage tank 53 (the low temperature side in the case of cooling and the high temperature side in the case of heating) is supplied to the heat exchanger 51b by the heat storage secondary pump 54, and the heat exchanger 51b. The heat storage medium radiated by the heat is returned to the heat radiating side (high temperature side for cooling, low temperature side for heating) in the heat storage tank 53, and the temperature of the heat source water sent from the heat exchanger 51b is predetermined. The heat storage secondary pump 54 adjusts the circulation amount of the heat storage medium by changing the rotational speed of the heat storage secondary pump 54 with an inverter so as to be held at the temperature.

  The load side system 60 includes a secondary pump 62 that sends heat source water having a predetermined temperature introduced into the forward header SH by the heat source side system 50 to the load side device 61 via the load side forward header 64, and an air conditioning load. Accordingly, a two-way valve 63 that adjusts the amount of heat source water supplied to the load-side device 61 is installed, and the two-way valve 63 opens and closes according to the air conditioning load. Even when the water supply amount changes, the secondary pump 62 is controlled by the inverter so that the water supply differential pressure, that is, the differential pressure between the load-side forward header 64 and the forward header SH is maintained at the set differential pressure. The number of rotations can be changed.

  Moreover, since the primary pumps 52a and 52b of the heat source side system 50 are configured to send the heat source water having the rated flow rate to the forward header SH, the amount of heat source water supplied to the load side device 61 in the load side system 60 However, if the amount of heat source water introduced into the forward header SH by the heat source side system 50 is smaller than the amount of heat source water introduced into the forward header SH, the surplus header of the heat source water introduced into the forward header SH is directly returned to the return header RH. SH and return header RH are connected by a bypass pipe BP.

Japanese Patent Laid-Open No. 08-145417

  Incidentally, as described above, in the air conditioning system including the constant flow type heat source side system 50, the case where the air conditioning load and the capabilities of the heat source side system 50 (heat source device 51a, heat exchanger 51b) are balanced is excluded. Thus, since the heat source side system 50 is operated in a state where the surplus heat source water is returned to the header RH from the forward header SH via the bypass pipe BP, the return header RH is normally returned from the load side system 60. The heat source water 51a and the heat exchanger 51b are mixed in a state where the heat source water after heat radiation introduced into the heat source water and the heat source water before heat radiation returned from the forward header SH and introduced into the header RH are mixed via the bypass pipe BP. Therefore, the incoming temperature of the heat source water to the heat source device 51a or the heat exchanger 51b is increased (cooling) or decreased (heating) to the designed incoming temperature calculated assuming the maximum air conditioning load. ) That there is little to be.

  Therefore, for example, when the heat exchanger system 50b is operating independently, if heat source water that has not increased or decreased to the design incoming water temperature is introduced into the heat exchanger 51b, heat exchange is performed from the heat storage side of the heat storage tank 53. The temperature of the heat storage medium returned to the heat radiating side of the heat storage tank 53 after being supplied to the heater 51b and radiated by the heat exchanger 51b also rises to the design return temperature calculated assuming the maximum air conditioning load (during cooling) or The heat storage medium that does not use up the stored heat is stored on the heat radiating side of the heat storage tank 53 without being lowered (during heating).

  However, once the heat storage medium is returned to the heat radiating side of the heat storage tank 53, the heat stored in the heat storage medium is used to process the air conditioning load, that is, to generate heat source water at a predetermined temperature. Therefore, there is a problem that the heat stored in the heat storage tank 53 cannot be used efficiently.

  Further, since the retained heat was hardly used, when the heat storage medium having a temperature close to the heat storage temperature is partially stored in the heat storage tank 53, when performing the heat storage operation at night using midnight power or the like, the capacity As a result of the control, the heat source device such as a refrigerator may stop operation in the middle, and there is a problem that the heat storage operation cannot be performed smoothly and reliably.

  Then, the subject of this invention is providing the air-conditioning system which can utilize the heat | fever stored in the heat storage tank as efficiently as possible at least, when the heat exchanger system is operate | moving independently.

  In order to solve the above-mentioned problem, the invention according to claim 1 is generated by a heat source side system that generates heat source water at a predetermined temperature and is connected to each other via a forward header and a return header, and the heat source side system. A load side system in which a load side device that processes an air conditioning load using heat source water at a predetermined temperature is installed, and the heat source side system is individually connected to the forward header and the return header. Heat source water at a predetermined temperature is generated using heat from the heat source equipment system in which the constant flow type heat source equipment and the primary pump for the heat source equipment are installed and the heat storage medium stored in the heat storage tank. A heat exchanger system and a heat exchanger system in which a primary pump for heat exchanger is installed, and the load side system supplies heat source water at a predetermined temperature introduced into the forward header by the heat source side system, For load side equipment A secondary pump for discharging, and having a bypass flow path for returning excess heat source water at a predetermined temperature introduced into the forward header by the heat source side system to the return header, and the heat source side system includes an air conditioning load In the air conditioning system in which start / stop control of the heat source equipment system and the heat exchanger system is performed according to the above, when the heat exchanger system is operating, the water flow rate in the load side system The air supply system is characterized in that the water supply flow rate in the heat exchanger system is adjusted so that the water supply flow rate in the heat source system matches or substantially matches.

  Moreover, in order to solve said subject, the invention concerning Claim 2 is produced | generated by the heat source side system | strain and the said heat source side system | strain which produce | generate the heat source water of the predetermined temperature mutually connected through the forward header and the return header A load side system in which a load side device that processes an air conditioning load using heat source water of a predetermined temperature is provided, and the heat source side system is individually connected to the forward header and the return header, Heat source water at a predetermined temperature using heat of a heat source device system in which a constant flow type heat source device for generating heat source water at a predetermined temperature and a heat source device system provided with a primary pump for the heat source device and a heat storage medium stored in a heat storage tank are stored. A heat exchanger system and a heat exchanger system in which a primary pump for the heat exchanger is installed, and the load side system supplies heat source water having a predetermined temperature introduced into the forward header by the heat source side system. The load side A surplus amount of heat source water having a predetermined temperature introduced into the forward header by the heat source side system is returned to the return header via a bypass channel. In the air conditioning system in which the on / off control of the heat source equipment system and the heat exchanger system is performed according to the air conditioning load, the heat source system is configured to perform the heat exchange. The heat source water generated at a predetermined temperature is sent to the forward header by the constant flow type primary pump for heat exchanger, and the operation of the secondary pump is stopped. A variable flow type shared pump that can circulate and supply heat source water of the same flow rate as the rated flow rate of the primary pump for the heat source device to the side device bypasses the primary pump and the secondary pump for the heat source device. And the sub-flow path connected to the load-side system and the main flow path, and the operation of the secondary pump and the primary pump for the heat exchanger is stopped during the independent operation of the heat exchanger system. In the state where the heat exchanger system is switched to the sub-flow path, the water supply flow rate of the heat source water by the shared pump is adjusted so that the water supply differential pressure of the load side system is maintained at a predetermined differential pressure. The present invention provides an air conditioning system characterized by the above.

  In order to solve the above-mentioned problem, the invention according to claim 3 is generated by a heat source side system that generates heat source water having a predetermined temperature and is connected to each other via a forward header and a return header, and the heat source side system. A load side system in which a load side device that processes an air conditioning load using heat source water at a predetermined temperature is installed, and the heat source side system is individually connected to the forward header and the return header. Heat source water at a predetermined temperature is generated using heat from the heat source equipment system in which the constant flow type heat source equipment and the primary pump for the heat source equipment are installed and the heat storage medium stored in the heat storage tank. A heat exchanger system and a heat exchanger system in which a primary pump for heat exchanger is installed, and the load side system supplies heat source water at a predetermined temperature introduced into the forward header by the heat source side system, For load side equipment A surplus of heat source water at a predetermined temperature introduced into the forward header by the heat source side system is returned to the return header via a bypass flow path. The heat source system is an air conditioning system in which start / stop control of the heat source device system and the heat exchanger system is performed according to an air conditioning load, and the heat exchanger system is controlled by the heat exchanger. The generated heat source water at a predetermined temperature is sent to the forward header by the variable flow type primary pump for heat exchanger, and the operation of the secondary pump is stopped for the heat exchanger. The variable flow type common pump that can circulate and supply the heat source water at a predetermined flow rate lower than the rated flow rate of the primary pump bypasses the primary pump and the secondary pump for the heat source device. And a sub-channel connected to the main channel, and when the heat exchanger system is in an independent operation and the water supply flow rate of the heat source water in the load-side system exceeds a predetermined flow rate In the state where the heat exchanger system is switched to the main flow path, the water supply flow rate of the heat source water in the load side system and the water supply flow rate of the heat source water in the heat exchanger system are matched or substantially matched. The water supply flow rate of the heat source water by the primary pump for heat exchanger is adjusted, and when the water supply flow rate in the load side system is lower than a predetermined flow rate when the heat exchanger system is operating alone, With the operation of the secondary pump and the primary pump for the heat exchanger stopped and the heat exchanger system switched to the sub flow path, the water supply differential pressure of the load side system is maintained at a predetermined differential pressure. And said The present invention provides an air conditioning system characterized in that the flow rate of water supplied from a heat source water by a common pump is adjusted.

  Here, for convenience, the terms “forward header” and “return header” are used, but the same functions as “forward header” and “return header” can be realized by piping. It goes without saying that such an air conditioning system is also included in the present invention.

  As described above, in the air conditioning system according to the first aspect of the present invention, when the heat exchanger system is operating, the water supply flow rate in the load side system and the water supply flow rate in the heat source side system are matched or substantially matched. Since the water supply flow rate in the heat exchanger system is adjusted, at least when the heat exchanger system is operating, the heat source water at a predetermined temperature is returned from the forward header to the return header via the bypass channel. Heat source water that is not returned and is sent from the load-side equipment in the load-side system and that is equal to or higher than the design water temperature calculated assuming the maximum air conditioning load is introduced into the heat exchanger. Therefore, when the heat exchanger system is in operation, the temperature of the heat storage medium supplied to the heat exchanger from the heat storage side of the heat storage tank and radiated by the heat exchanger and then returned to the heat dissipation side of the heat storage tank is the maximum. A heat storage medium that uses up the stored heat on the heat dissipation side of the heat storage tank, which rises above the design return temperature calculated during the air conditioning load (during cooling) or falls below the design return temperature (during heating). Therefore, it is possible to efficiently use the heat stored in the heat storage tank.

  In the air conditioning system of the invention according to claim 2, when the heat exchanger system is operated alone, the operation of the secondary pump and the primary pump for the heat exchanger is stopped and the heat exchanger system is switched to the sub flow path. In this state, the water supply flow rate of the heat source water by the common pump is adjusted so that the water supply differential pressure of the load side system is maintained at a predetermined differential pressure, that is, the heat source water is supplied to one common pump. Circulates between the load side system and the heat exchanger system, so that the heat source water of a predetermined temperature is not returned to the return header from the forward header via the bypass flow path, and the load side system The heat source water that is sent from the load side equipment and is equal to or higher than the designed water temperature calculated assuming the maximum air conditioning load is introduced into the heat exchanger. Therefore, after the heat is radiated by the heat exchanger, the temperature of the heat storage medium returned to the heat radiating side of the heat storage tank rises above the design return temperature calculated for the maximum air conditioning load (at the time of cooling) or falls below the design return temperature. It will be reduced (during heating), and the heat storage medium that uses up the stored heat will be stored on the heat dissipation side of the heat storage tank, so it is possible to efficiently use the heat stored in the heat storage tank It becomes.

  Further, when the heat exchanger system is operated alone, as described above, it is only necessary to operate one common pump, and the rated flow rate of the shared pump is the rated flow rate of the secondary pump (the secondary pump is When divided into multiple units, it is smaller than the total rated flow of each secondary pump), so the head for the heat exchanger system is the same, but the head for the load side system is A pump having a head that is smaller than the head and smaller than the sum of the heads of the secondary pump and the primary pump for the heat exchanger can be selected as the common pump. Therefore, compared with the conventional air conditioning system which must operate a secondary pump and the primary pump for heat exchangers simultaneously, there exists an advantage that pump power becomes small and a running cost can be reduced.

  In the air conditioning system according to the third aspect of the present invention, when the water supply flow rate of the heat source water in the load side system exceeds a predetermined flow rate during the independent operation of the heat exchanger system, the heat exchanger system is connected to the main flow path. In the state switched to, adjust the water supply flow rate of the heat source water by the primary pump for the heat exchanger so that the water supply flow rate of the heat source water in the load side system and the water supply flow rate of the heat source water in the heat exchanger system match or substantially match. When the water supply flow rate in the load side system falls below the predetermined flow rate, the operation of the secondary pump and the primary pump for the heat exchanger is stopped and the heat exchanger system is switched to the sub flow path. Since the water supply flow rate of the heat source water by the shared pump is adjusted so that the water supply differential pressure of the load side system is maintained at a predetermined differential pressure, Heat source water at a predetermined temperature is not returned to the return header from the return header via the flow path, and heat source water that is higher than the design water temperature sent from the load side equipment in the load side system is introduced into the heat exchanger. become. Therefore, after the heat is radiated by the heat exchanger, the temperature of the heat storage medium returned to the heat radiating side of the heat storage tank rises above the design return temperature calculated for the maximum air conditioning load (at the time of cooling) or falls below the design return temperature. It will be reduced (during heating), and the heat storage medium that uses up the stored heat will be stored on the heat dissipation side of the heat storage tank, so it is possible to efficiently use the heat stored in the heat storage tank It becomes.

  In particular, in this air conditioning system, the rated flow rate of the shared pump is smaller than the rated flow rate of the primary pump for heat exchanger, so that the lift for the load side system is not only smaller than the lift of the secondary pump, but also heat exchange. Since the head for the system is also smaller than the head of the primary pump for heat exchanger, a pump with a lower head can be selected as a common pump. Therefore, in a state where the water supply flow rate in the load side system is reduced below the predetermined flow rate, compared to the case where the common pump having the same rated flow rate as that of the primary pump for heat exchanger is operated while reducing the rotation speed. The pump power can be reduced, and the running cost can be further reduced.

  Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1, the air conditioning system 1 includes a load side system 10 in which a load side device 14 such as an air conditioner that processes an air conditioning load is installed, and heat source water of a predetermined temperature (for example, 7 ° C. cold water). The heat source side system 20 that is generated and sent to the load side system 10 is connected to each other via the forward header 31 and the return header 32. The forward header 31 and the return header 32 are connected to the bypass pipe 33. Are connected to each other.

  The load side system 10 includes a load side forward header 13 connected to the forward header 31 via a load side forward piping 11a where the secondary pump 11 is installed and a load side bypass piping 12a where the bypass valve 12 is installed. The load side device 14 is connected to the load side forward header 13 and the return header 32 via the load side pipe 15.

  A two-way valve 16 is installed upstream of the load-side device 14 in the load-side piping 15, and the heat source water to the load-side device 14 is opened and closed by opening and closing the two-way valve 16 according to the air conditioning load. The supply amount is adjusted.

  Moreover, the secondary pump 11 can adjust the water supply amount by changing the rotation speed by an inverter, and the two-way valve 16 opens and closes according to the air conditioning load. Even when the amount of water supplied to the side device 14 changes, the differential pressure between the load side forward header 13 and the forward header 31 detected by the differential pressure transmitter 41, that is, the differential pressure of water delivery to the load side system 10. The programmable logic controller 40 controls the rotational speed of the secondary pump 11 so that the differential pressure becomes the set differential pressure.

  However, when the two-way valve 16 of the load side system 10 is fully closed or close to the fully closed state, the secondary pump 11 performs a deadline operation or an operation close thereto, so that the amount of water supplied to the load side device 14 is reduced. When the number is reduced, the bypass valve 12 is opened, and the heat source water introduced into the load-side forward header 13 by the secondary pump 11 is returned to the forward header 31 via the load-side bypass pipe 12a. ing.

  The heat source side system 20 includes a heat source device system 20 a including a constant flow type heat source device 21 a such as a refrigerator that generates heat source water of a predetermined temperature, and a heat storage medium (water) stored in the heat storage tank 26. The heat exchanger system 20b is provided with a heat exchanger 21b that generates heat source water at a predetermined temperature using heat, and the programmable logic controller 40 is connected to the load side device 14 in the load side piping 15. Air conditioning load calculated based on the load-side flow rate detected by the flow meter 42 installed on the downstream side and the water supply temperature difference in the load-side system 10, that is, the temperature difference between the forward header 31 and the return header 32. Accordingly, the start / stop control of the heat source device system 20a and the heat exchanger system 20b is performed.

  In the heat source device system 20a, a heat source device 21a and a heat source device primary pump 22a are connected to a forward header 31 and a return header 32 by a heat source side pipe 23a, and the heat source device primary pump 22a has a rated flow rate. The head has a head that can return the heat source water from the header 32 to the header 31 through the heat source device 21a.

  In the heat exchanger system 20b, a heat exchanger 21b and a heat exchanger primary pump 22b are connected to a forward header 31 and a return header 32 by a heat source side pipe 23b, and a shared pump 24b is a heat source. The heat source side piping 25b is connected to the downstream side of the heat exchanger 21b in the load side forward header 13 and the main flow path (heat source side piping 23b) so as to bypass the equipment primary pump 22a and the secondary pump 11. In addition, the heat exchanger primary pump 22b and the common pump 24b can adjust the water supply flow rate by changing the number of rotations of each of them by an inverter.

  The primary pump 22b for heat exchanger has a head that can send the heat source water of the rated flow rate from the return header 32 through the heat exchanger 21b to the forward header 31. The common pump 24b is the heat exchanger 1 It has a head that can return heat source water having a rated flow rate lower than the rated flow rate of the next pump 22b from the return header 32 to the return header 32 through the heat exchanger 21b and the load side system (load side device 14).

  In the case where the heat exchanger system 20b is operating alone, when the feed flow rate of the heat source water in the load system 10 exceeds the rated flow rate of the shared pump 24b, the shared pump 24b is not operated and the load side The programmable logic controller 40 changes the rotation speed of the heat pump primary pump 22b so that the water supply flow rate of the heat source water in the system 10 and the water supply flow rate of the heat source water in the heat exchanger system 20b match or substantially match. By doing so, the water supply flow rate of the heat source water in the heat exchanger system 20b is adjusted. That is, the programmable logic controller 40 stores in advance a table or a relational expression that indicates the relationship between the frequency of the inverter that changes the rotation speed of the secondary pump 11 and the water supply flow rate of the heat source water in the load side system 10. In accordance with this table and the relational expression, the water supply flow rate of the heat source water in the load side system 10 is calculated from the frequency of the inverter when the secondary pump 11 is actually operating, and the water supply flow rate of the heat exchanger primary pump 22b. However, the programmable logic controller 40 changes the rotational speed of the primary pump 22b for heat exchanger by an inverter so that it matches the calculated flow rate of the heat source water in the load side system 10. .

  In addition, when the heat exchanger system 20b is operating alone, if the feed flow rate of the heat source water in the load side system 10 falls below the rated flow rate of the shared pump 24b, the secondary pump 11 and the primary pump for the heat exchanger The operation of 22b is stopped and the common pump 24b is started, and the water supply differential pressure (the differential pressure between the load side forward header 13 and the forward header 31) detected by the differential pressure transmitter 41 is detected by the differential pressure transmitter 41. The programmable logic controller 40 adjusts the water supply flow rate of the heat source water by changing the rotation speed of the shared pump 24b by an inverter so that the set differential pressure is obtained.

  Although not shown in the figure, since a check valve is usually installed on the discharge side of the heat exchanger primary pump 22b and the common pump 24b, the main flow path and the sub flow path are switched. In addition, the heat source water does not flow back into the sub-channel and the main channel. Therefore, it is not necessary to provide a pump switching valve or the like, and switching between the main flow path and the sub flow path can be performed simply by starting and stopping the pump. Further, when switching from the main flow path to the sub flow path, the shared pump 24b is started with the rotation speed reduced while the secondary pump 11 and the heat exchanger primary pump 22b are operating. Then, the operation can be smoothly switched by stopping the operation of the secondary pump 11 and the heat exchanger primary pump 22b.

  Further, the heat storage medium stored on the heat storage side in the heat storage tank 26 (the low temperature side in the case of cooling and the high temperature side in the case of heating) is transferred to the heat exchanger by the heat storage secondary pump 27 via the heat storage secondary pipe 28. The heat storage medium supplied to the heat exchanger 21b and radiated by the heat exchanger 21b is returned to the heat radiating side (the high temperature side in the case of cooling, the low temperature side in the case of heating) in the heat storage tank 26, and in the heat source side pipe 23b The water supply temperature of the heat source water sent from the heat exchanger 21b, which is detected by the water supply temperature sensor 43 installed on the downstream side of the heat exchanger 21b and upstream of the connecting portion of the sub flow path (heat source side pipe 25b), is The programmable logic controller 40 supplies the heat storage medium to the heat exchanger 21b by changing the rotation speed of the heat storage secondary pump 27 with an inverter so that the temperature is maintained at a predetermined temperature. It is adapted to adjust.

  As described above, in the air conditioning system 1, when the heat source water supply flow rate in the load side system 10 exceeds the rated flow rate of the shared pump 24b during the independent operation of the heat exchanger system 20b, the heat exchanger system In the state where 20b is switched to the main flow path, the heat pump primary pump 22b so that the water flow rate of the heat source water in the load side system 10 and the water flow rate of the heat source water in the heat exchanger system 20b match or substantially match. When the water supply flow rate in the load side system 10 falls below the rated flow rate of the shared pump 24b, the operation of the secondary pump 11 and the heat exchanger primary pump 22b is stopped. In the state where the heat exchanger system 20b is switched to the sub flow path, the common pump 24 is configured so that the water supply differential pressure of the load side system 10 is maintained at the set differential pressure. Since the water supply flow rate of the heat source water is adjusted, the heat source water at a predetermined temperature may be returned to the return header 32 from the return header 31 via the bypass pipe 33 when the heat exchanger system 20b is operated alone. Instead, heat source water having a temperature equal to or higher than the design water temperature sent from the load side device 14 in the load side system 10 is introduced into the heat exchanger 21b. Therefore, after the heat exchanger 21b radiates heat, the temperature of the heat storage medium returned to the heat radiating side of the heat storage tank 26 rises above the design return temperature calculated during the maximum air conditioning load (during cooling) or the design return temperature. Since the heat storage medium that uses up the stored heat will be stored on the heat radiation side of the heat storage tank 26, the heat stored in the heat storage tank 26 is used efficiently. It becomes possible to do.

  Further, when the water supply flow rate in the load side system 10 falls below the rated flow rate of the shared pump 24b during the independent operation of the heat exchanger system 20b, only one shared pump 24b needs to be operated, and the shared pump Since the rated flow rate of 24b is smaller than the rated flow rate of the secondary pump 11 and the primary pump 22b for heat exchanger, the lift for the load side system is smaller than the lift of the secondary pump 11, and the heat exchanger system Since the lift of the minute is also smaller than the lift of the primary pump 22b for the heat exchanger, a pump having a lift smaller than the sum of the lifts of the secondary pump 11 and the primary pump 22b for the heat exchanger can be selected as the common pump 24b. Therefore, in a state where the water supply flow rate in the load side system 10 is lower than the rated flow rate of the common pump 24b, the pump is more than the conventional air conditioning system in which the secondary pump and the primary pump for heat exchanger must be operated simultaneously. There is an advantage that the power is reduced and the running cost can be reduced.

  This reduction in running costs is particularly noticeable when the air-conditioning load characteristic is extremely low because the scheduled system stops air-conditioning operation at night, etc. become.

  In the above-described embodiment, a pump having a smaller rated flow rate than the rated flow rate of the primary pump 22b for heat exchanger is used as the shared pump 24b. However, the present invention is not limited to this, and for example, for the heat exchanger It is also possible to use a shared pump 24b having the same rated flow rate as that of the primary pump 22b. In this case, the secondary pump 11 and the primary for heat exchanger are used during the independent operation of the heat exchanger system 20b. What is necessary is just to adjust the water supply flow rate of the heat source water by the common pump 24b so that the operation of the pump 22b is stopped and the common pump 24b is started and the water supply differential pressure of the load side system 10 is maintained at the set differential pressure. Moreover, when using the variable flow type common pump 24b having the same rated flow rate as that of the heat exchanger primary pump 22b, it is necessary to adjust the water supply flow rate of the heat source water by the heat exchanger primary pump 22b. Therefore, it is not necessary to provide an inverter in the heat exchanger primary pump 22b.

  Thus, when the variable flow type common pump 24b having the same rated flow rate as the rated flow rate of the heat exchanger primary pump 22b is used, the head for the heat exchanger system has a lift of the heat exchanger primary pump 22b. The nominal flow rate of the shared pump 24b is smaller than the rated flow rate of the secondary pump 11, but the lift for the load side system becomes smaller than the lift of the secondary pump 11, but the secondary pump 24b does not become smaller than the lift. A pump having a head smaller than the sum of the heads of the pump 11 and the primary pump 22b for heat exchanger can be selected as the common pump 24b. Therefore, when the heat exchanger system 20b is operated independently, the pump power is reduced and the running cost is reduced as compared with the conventional air conditioning system in which the secondary pump and the primary pump for heat exchanger must be operated simultaneously. There is an advantage that can be.

  Moreover, in embodiment mentioned above, although the heat exchanger system | strain 20b is provided with two pumps, such as the primary pump 22b for heat exchangers, and the common pump 24b, it is not limited to this, For example, FIG. When the inverter is installed in the primary pump 22b for heat exchanger and the heat exchanger system 20b is operating without providing a common pump as shown in the air conditioning system 2 shown, for the heat exchanger in the above-described air conditioning system 1 Similar to the primary pump 22b, the programmable logic controller 40 uses an inverter to heat the primary pump for the heat exchanger so that the water supply flow rate in the load side system 10 and the water supply flow rate in the heat source side system 20 match or substantially match. By changing the number of rotations of 22b, the water supply flow rate in the heat exchanger system 20b is adjusted. However, when the heat exchanger system 20b is operating, the heat source water of a predetermined temperature is not returned to the return header 32 from the return header 31 via the bypass pipe 33, and the load side equipment 10 in the load side system 10 Since the heat source water having a temperature equal to or higher than the design incoming water temperature delivered from 14 is introduced into the heat exchanger 21b, the heat storage medium that uses up the stored heat is stored on the heat radiation side of the heat storage tank 26. The heat stored in the heat storage tank 26 can be used efficiently. In this case, when the heat source equipment system 20a and the heat exchanger system 20b are operating simultaneously, the heat source equipment system 20a operates at the maximum capacity, and the heat source equipment system 20a lacks an air conditioning load that cannot be processed. Since the heat exchanger system 20b performs the operation while suppressing the capacity so as to compensate for the minute, the air conditioning operation is performed while preserving the heat stored in the heat storage tank 26.

  In the above-described embodiment, the bypass pipe 33 is directly connected to the forward header 31 and the return header 32. However, the present invention is not limited to this. For example, the bypass pipe connected to the forward header 31 is returned to the return pipe 31. Instead of the header 32, it is possible to connect to the downstream side of the flow meter 42 in the load side pipe 15.

  Moreover, although the heat source side system | strain 20 demonstrated the air conditioning systems 1 and 2 provided with the one heat source apparatus system | strain 20a and the one heat exchanger system | strain 20b in embodiment mentioned above, it is not limited to this. The present invention can also be applied to an air conditioning system including two or more heat source device systems and one heat exchanger system.

  Moreover, although the load side system | strain 10 demonstrated the air conditioning system 1 provided with the one secondary pump 11 in embodiment mentioned above, it is not limited to this, It is provided with two or more secondary pumps. Needless to say, the present invention can be applied to an air-conditioning system. In that case, while simultaneously operating a plurality of secondary pumps, the number of revolutions can be changed in the same way, It is also possible to control the number of pumps.

  In the above-described embodiment, the programmable logic controller 40 controls the rotational speed of the primary pump 22b for the heat exchanger, the common pump 24b, the heat storage secondary pump 27, the secondary pump 11 and the opening / closing control of the bypass valve 12. However, the present invention is not limited to this. For example, various control means such as a temperature controller and a differential pressure controller may be used in combination.

  Moreover, in each embodiment mentioned above, although adjusting the rotation speed of the primary pump 22b for heat exchangers, or the common pump 24b, the amount of water supply of the heat source water in the heat exchanger system 20b is adjusted, For example, a constant flow pump is used as the heat exchanger primary pump 22b or the common pump 24b, and heat exchange is performed by opening and closing operations such as flow control valves provided in the heat source side pipes 23b and 25b. It is also possible to adjust the water supply amount of the heat source water in the vessel system 20b. In this case, however, it is needless to say that a sufficient running cost reduction effect cannot be obtained.

  In the above-described embodiment, the load-side bypass pipe 12a is connected to the load-side forward header 13 and the forward header 31. However, the present invention is not limited to this, and is connected to the load-side forward header 13, for example. The load side bypass pipe may be connected to the return header 32 instead of the forward header 31 or connected to the downstream side of the flow meter 42 in the load side pipe 15.

It is a schematic structure figure showing one embodiment of an air-conditioning system concerning this invention. It is a schematic block diagram which shows the air conditioning system which is other embodiment. It is a schematic block diagram which shows the conventional air conditioning system.

Explanation of symbols

1, 2 Air conditioning system 10 Load side system 11 Secondary pump 11a Load side forward piping 12 Bypass valve 12a Load side bypass piping 13 Load side forward header 14 Load side equipment 15 Load side piping 16 Two-way valve 20 Heat source side system 20a Heat source equipment System 20b Heat exchanger system 21a Heat source equipment 21b Heat exchanger 22a Primary pump for heat source equipment 22b Primary pump for heat exchanger 23a, 23b, 25b Heat source side piping 24b Shared pump 26 Heat storage tank 27 Heat storage secondary pump 28 Heat storage secondary Piping 31 Outgoing header 32 Return header 33 Bypass pipe (bypass flow path)
40 Programmable logic controller 41 Differential pressure transmitter 42 Flow meter 43 Water supply temperature sensor

Claims (3)

A heat source side system that generates heat source water of a predetermined temperature and a load side that processes the air conditioning load using the heat source water of a predetermined temperature generated by the heat source side system, connected to each other via a forward header and a return header With the load side system where the equipment is installed,
The heat source side system is connected to the forward header and the return header individually, and the heat source equipment system and the heat source equipment system in which the primary pump for the heat source equipment and the heat source equipment for generating the heat source water of the predetermined temperature are installed and the heat storage A heat exchanger system that generates heat source water at a predetermined temperature using heat stored in the heat storage medium stored in the tank, and a heat exchanger system in which a primary pump for the heat exchanger is installed,
The load side system has a secondary pump that sends heat source water of a predetermined temperature introduced into the forward header by the heat source side system to the load side device,
A bypass flow path for returning an excess of heat source water at a predetermined temperature introduced into the forward header by the heat source side system to the return header;
The heat source side system is an air conditioning system in which start / stop control of the heat source device system and the heat exchanger system is performed according to an air conditioning load,
When the heat exchanger system is operating, the water supply flow rate in the heat exchanger system is adjusted so that the water supply flow rate in the load side system and the water supply flow rate in the heat source side system match or substantially match. An air conditioning system characterized by A heat source side system that generates heat source water of a predetermined temperature and a load side that processes the air conditioning load using the heat source water of a predetermined temperature generated by the heat source side system, connected to each other via a forward header and a return header With the load side system where the equipment is installed,
The heat source side system is connected to the forward header and the return header individually, and the heat source equipment system and the heat source equipment system in which the primary pump for the heat source equipment and the heat source equipment for generating the heat source water of the predetermined temperature are installed and the heat storage A heat exchanger system that generates heat source water at a predetermined temperature using heat stored in the heat storage medium stored in the tank, and a heat exchanger system in which a primary pump for the heat exchanger is installed,
The load side system has a secondary pump that sends heat source water of a predetermined temperature introduced into the forward header by the heat source side system to the load side device,
The excess heat source water at a predetermined temperature introduced into the forward header by the heat source side system is returned to the return header via a bypass channel,
The heat source side system is an air conditioning system in which start / stop control of the heat source device system and the heat exchanger system is performed according to an air conditioning load,
The heat exchanger system includes a main flow path for sending heat source water having a predetermined temperature generated by the heat exchanger to the forward header by a constant flow type primary pump for the heat exchanger, and the secondary pump. A variable flow type shared pump capable of circulatingly supplying heat source water having the same flow rate as the rated flow rate of the primary pump for heat source equipment to the load side equipment with the operation of A sub-flow path connected to the load side system and the main flow path so as to bypass the secondary pump;
At the time of independent operation of the heat exchanger system, the operation of the secondary pump and the primary pump for heat exchanger is stopped and the heat exchanger system is switched to the sub flow path, An air conditioning system characterized in that the water supply flow rate of the heat source water by the shared pump is adjusted so that the water supply differential pressure is maintained at a predetermined differential pressure. A heat source side system that generates heat source water of a predetermined temperature and a load side that processes the air conditioning load using the heat source water of a predetermined temperature generated by the heat source side system, connected to each other via a forward header and a return header With the load side system where the equipment is installed,
The heat source side system is connected to the forward header and the return header individually, and the heat source equipment system and the heat source equipment system in which the primary pump for the heat source equipment and the heat source equipment for generating the heat source water of the predetermined temperature are installed and the heat storage A heat exchanger system that generates heat source water at a predetermined temperature using heat stored in the heat storage medium stored in the tank, and a heat exchanger system in which a primary pump for the heat exchanger is installed,
The load side system has a secondary pump that sends heat source water of a predetermined temperature introduced into the forward header by the heat source side system to the load side device,
The excess heat source water at a predetermined temperature introduced into the forward header by the heat source side system is returned to the return header via a bypass channel,
The heat source side system is an air conditioning system in which start / stop control of the heat source device system and the heat exchanger system is performed according to an air conditioning load,
The heat exchanger system includes a main flow path for sending heat source water having a predetermined temperature generated by the heat exchanger to the forward header by the variable flow type primary pump for heat exchanger, and the secondary pump. The variable flow type common pump that can circulate and supply the heat source water at a predetermined flow rate lower than the rated flow rate of the primary pump for the heat exchanger while the operation of the primary pump for the heat source and the secondary pump are stopped. And having a sub-flow path connected to the load side system and the main flow path,
During the independent operation of the heat exchanger system, when the water supply flow rate of the heat source water in the load side system exceeds a predetermined flow rate, the heat exchanger system is switched to the main flow path, The water supply flow rate of the heat source water by the primary pump for heat exchanger is adjusted so that the water supply flow rate of the heat source water in the load side system and the water supply flow rate of the heat source water in the heat exchanger system match or substantially match. And
When the water supply flow rate in the load side system drops below a predetermined flow rate when the heat exchanger system is operating alone, the operation of the secondary pump and the primary pump for the heat exchanger is stopped and the heat exchanger In a state where the system is switched to the sub flow path, the water supply flow rate of the heat source water by the shared pump is adjusted so that the water supply differential pressure of the load side system is maintained at a predetermined differential pressure. Characteristic air conditioning system.

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