JP2005069555A - Large temperature difference water heat source air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain the facility costs and operation costs of an air conditioning system, which performs zoning, and to efficiently operate a heat source machine. <P>SOLUTION: This system comprises the heat source machine 1 and a water heat source circuit 2 in which water heat source adjusted in temperature by the heat source machine 1 flows. The water heat source circuit 2 has a C-system water passage 16 to which a cold/hot water coil type air conditioner 19 is connected, and an HP-system water passage 17 to which a water-cooling heat pump type air conditioner 4 is connected. The outlet of the C-system water passage 16 and the inlet of the HP-system water passage 17 are connected. A predetermined zone of a space to be air-conditioned is air-conditioned by the cold/hot water coil type air conditioner 19, and the different zone is air-conditioned by the water-cooling heat pump type air conditioner 4. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a large temperature difference water heat source air conditioning system.

  As a water heat source air conditioning system that can perform zoning, a heat source device such as a boiler or a cooling tower, a heat source water circuit through which heat source water adjusted in temperature by this heat source device, and a plurality of heat source waters of the heat source water circuit are passed. Some are equipped with a water-cooled heat pump air conditioner for indoor air conditioning.

  In this system, zoning can be performed over a wide temperature control range, but compared to the cold / hot water coil air conditioner, the water-cooled heat pump air conditioner requires extra operations such as heat pumps and compressors. The operating cost is high. In addition, the operating efficiency of the heat source unit varies depending on the difference in water temperature between the return and return, but since the water temperature difference (heat source load) caused by the cooling / heating operation of the water-cooled heat pump air conditioner is small, the temperature of the heat source unit must be controlled efficiently. Is difficult.

JP-A-6-341683

  The problems to be solved are that the zoning by the water-cooled heat pump type air conditioner is incurred in equipment cost and operation cost, and is likely to be wasteful in the operation of the heat source machine.

  In order to solve the above-mentioned problems, the present invention includes a heat source unit and a heat source water circuit through which heat source water whose temperature is adjusted by the heat source unit flows, and the heat source water circuit includes one or a plurality of cold / hot water coil types. A C-type water channel to which an air conditioner is connected and an HP-type water channel to which one or a plurality of water-cooled heat pump air conditioners are connected, and an outlet of the C-type water channel and an inlet of the HP-type water channel are connected The most important feature is that a predetermined zone of the air-conditioned space is air-conditioned by the cold / hot water coil air conditioner and a different zone is air-conditioned by the water-cooled heat pump air conditioner.

According to the first aspect of the present invention, for example, a zone in which the heat load is difficult to increase or decrease in the north direction (the temperature control range is not wide) is air-conditioned by the cold / hot water coil type air conditioner 19 having a low operating cost, and the heat load is in the south direction. Zoning can be performed while adjusting the capacity finely with the water-cooled heat pump type air conditioner 4 and the zone of the hot and cold water coil type air conditioner 19 of the C system water channel 16 and the HP system water channel 17 can be greatly increased and decreased (wide temperature control range). The combined use with the water-cooled heat pump type air conditioner 4 makes it possible to increase the difference in the temperature between the return and return of the heat source water, thereby improving the operation efficiency of the heat source device and saving energy. In addition, the equipment cost can be reduced by using an inexpensive cold / hot water coil type air conditioner 19.
According to the second aspect of the present invention, even if the heat source load fluctuates, the water temperature difference between the return and return of the heat source water can be adjusted by the water-cooled heat pump type heat recovery machine 13, and the heat source apparatus can be stably operated at high efficiency at all times. Save energy. Since the water-cooled heat pump type heat recovery machine 13 is connected to the return pipe 2b, the cold / hot water coil type air conditioner 19 can be used in combination without affecting the capacity variation.

  FIG. 1 and FIG. 2 show one embodiment of the large temperature difference water heat source air conditioning system of the present invention in a simplified diagram. The large temperature difference water heat source air conditioning system includes a heat source unit 1 and a temperature at the heat source unit 1. A heat source water circuit 2 through which the adjusted heat source water flows and a water feed pump 3 that sends the heat source water in the direction of the arrow are provided. The heat source unit 1 is configured so that the heat source water can be switched between hot water and cold water by a boiler for hot water, a cooling tower or chiller for cold water, and a switching mechanism (not shown). The heat source water circuit 2 includes a C-type water channel 16 to which one or a plurality of cold / hot water coil type air conditioners 19 are connected, and an HP-type water channel 17 to which one or more water-cooled heat pump type air conditioners 4 are connected. , The outlet of the C water channel 16 and the inlet of the HP water channel 17 are connected, a predetermined zone of the air-conditioned space is air-conditioned by the cold / hot water coil type air conditioner 19, and a different zone is water-cooled heat pump type air-conditioning The machine 4 is configured to be air-conditioned.

  The heat source water inlet path of the cold / hot water coil air conditioner 19 is connected to the forward pipe 16 a of the C system water path 16, and the heat source water outlet path is connected to the return pipe 16 b of the C system water path 16. The heat source water inlet path of the water-cooled heat pump type air conditioner 4 is connected to the forward pipe 17 a of the HP system water path 17, and the heat source water outlet path is connected to the return pipe 17 b of the HP system water path 17. The return pipe 2b downstream of the HP water channel 17 of the heat source water circuit 2 has a predetermined heat source water temperature difference between the function of discharging air from the air-conditioned space to the outdoors and the outdoor exhaust air and the heat source water from the return pipe 2b. A water-cooled heat pump heat recovery machine 13 having a heat pump 6 that is thermally moved so as to be connected is connected.

  Although not shown in the drawings, the cold / hot water coil type air conditioner 19 includes a cold / hot water coil through which the heat source water of the heat source water circuit 2 is passed through the casing and an air supply blower. Is cooled or heated, switching between cooling operation and heating operation is performed, and air is supplied to the air-conditioned space for air conditioning. Various types such as an air handling unit and a fan coil unit are applied to the cold / hot water coil air conditioner 19.

  Although not shown, the water-cooled heat pump air conditioner 4 includes a water-cooled heat pump and an air supply blower in the casing. The water-cooled heat pump includes a water heat exchanger that exchanges heat between the heat source water and the refrigerant, a refrigerant, and air for air conditioning. An air heat exchanger for exchanging heat, a compressor, an expansion valve, a forward / reverse switching valve for refrigerant circulation direction, a liquid receiver, etc. are connected by piping to form a refrigerant circulation circuit and The heat absorption and heat dissipation (evaporation function and condensation function) of the water heat exchanger and the air heat exchanger are configured to be switchable. The air-conditioning air is cooled or heated by the air heat exchanger of the water-cooled heat pump so that the cooling operation and the heating operation can be switched freely, and the air-conditioned space is supplied and air-conditioned.

  The water-cooled heat pump heat recovery machine 13 includes a heat pump 6 and an exhaust fan 7 in the casing 5. The casing 5 is provided with an air intake port 14 and an air discharge port 15 so as to communicate with an internal air passage. The heat pump 6 includes an air heat exchanger 9 for exchanging heat between the outdoor exhaust air and the refrigerant, a water heat exchanger 8 for exchanging heat between the heat source water and the refrigerant, a compressor 10, an expansion valve, and forward and reverse of the refrigerant circulation direction. The switching valve (four-way valve) and a liquid receiver (not shown) are connected by piping to form a refrigerant circulation circuit, and the heat absorption and heat radiation (evaporation) of the water heat exchanger 8 and the air heat exchanger 9 by the switching valve. Function and condensing function). The air intake 14 communicates with the indoor air-conditioned space, the air discharge port 15 communicates with the outdoors, and the outdoor exhaust air from the air-conditioned space is vented to the air heat exchanger 9. The refrigerant flowing through the air heat exchanger 9 is cooled or heated by the outdoor exhaust air, the heat source water flowing through the water heat exchanger 8 is cooled or heated by the refrigerant to adjust the water temperature, and the return pipe of the heat source water circuit 2 Heat source water is returned to the heat source unit 1 from 2b. The return pipe 2b is provided with a flow rate control valve 12, the upstream portion of the heat source water circuit 2 from the flow rate control valve 12 is connected to the heat source water inlet passage of the heat pump 6, and the downstream portion of the heat source water circuit 2 from the flow rate control valve 12 is water cooled. Connect to the heat source water outlet path of the heat pump 6. The flow rate control valve 12 is controlled by an unillustrated control means so that when the operation of the heat pump 6 is stopped, the heat source water is fully opened so that the heat source water does not flow into the water heat exchanger 8 due to its internal resistance, and is opened when the heat pump 6 is operated. The heat source water at a predetermined flow rate is made to flow to the water heat exchanger 8 by adjusting the degree. Therefore, even if a water pump is not provided between the heat source water circuit 2 and the heat pump 6, the heat source water can be diverted and allowed to flow to the heat pump 6 by the required amount.

  For example, when the cooling operation is performed by the cold / hot water coil type air conditioner 19, the heat source water (cold water) is supplied to the heat source water circuit 2 and the air for air conditioning is cooled by the cold / hot water coil. The heat source water that has entered the air conditioner 19 from the forward pipe 16 a of the C-system water channel 16 absorbs heat from the air-conditioning air, rises in temperature (for example, from 7 ° C. to 12 ° C.), and exits to the return pipe 16 b of the C-system water channel 16. Heat source water flows from the return pipe 16b of the C-system water channel 16 through the forward tube 17a of the HP-system water channel 17 to the water heat exchanger of the water-cooled heat pump air conditioner 4, and the circulating refrigerant of the water-cooled heat pump is condensed in the water heat exchanger. (Heat radiation) and function to evaporate (heat absorption) in the air heat exchanger, condense the circulating refrigerant with heat source water, and cool the air for air conditioning with the air heat exchanger. The heat source water that has entered the water heat exchanger from the forward pipe 17 a of the HP water channel 17 rises in temperature (for example, from 12 ° C. to 17 ° C.) due to the refrigerant heat dissipation action and exits to the return pipe 17 b of the HP water channel 17. The heat source water output from the water heat exchanger to the return pipe 17 b returns to the heat source unit 1 to be temperature-adjusted and circulates in the heat source water circuit 2. When heating operation is performed, heat source water (hot water) is supplied to the heat source water circuit 2 to heat the air-conditioning air using a cold / hot water coil, and the air heat exchanger and the water heat exchanger of the water-cooled heat pump type air conditioner 4 are cooled. The air-conditioning air is heated by an air heat exchanger.

  At this time, if the heat source water does not return to the heat source unit 1 with a predetermined water temperature difference due to the degree of fluctuation of the heat source load, the water cooling heat pump heat recovery machine 13 returns the heat source water so that the predetermined water temperature difference is obtained. Adjust the water temperature difference. For example, when the difference in water temperature is greater than a predetermined water temperature, the heat source water of the return pipe 2b is caused to flow through the water heat exchanger 8 of the water-cooled heat pump heat recovery machine 13 by adjusting the opening degree of the flow control valve 12, and the circulating refrigerant of the heat pump 6 is air heat. It functions to condense (heat release) in the exchanger 9 and evaporate (heat absorption) in the water heat exchanger 8, condense the circulating refrigerant with the air from the temperature-controlled air-conditioned space, and use the water heat exchanger 8 as heat source water The heat recovery machine 13 is operated in a cycle for cooling the. In this way, heat transfer is performed so that a predetermined heat source water temperature difference is obtained between the outdoor exhaust air and the heat source water from the return pipe 2b. The heat source water discharged from the water heat exchanger 8 to the return pipe 2b returns to the heat source unit 1 and the temperature is adjusted. In the case where the difference in water temperature is smaller than the predetermined water temperature, in reverse to the above, the heat recovery machine is operated in a cycle in which the circulating refrigerant is evaporated with the air from the temperature-controlled air-conditioned space and the heat source water is heated by the water heat exchanger 8. 13 is operated, and heat is transferred between the outdoor exhaust air and the heat source water from the return pipe 2b so as to have a predetermined heat source water temperature difference.

  In addition, in the said Example, increase / decrease in the number of the water cooling heat pump type heat recovery machines 13, the water cooling heat pump type air conditioner 4, and the cold / hot water coil type air conditioner 19 is free. The heat source water circuit 2 can be freely changed to various methods such as a direct return method, a reverse return method, and a combination method thereof, and the HP water channel 17 is a single tube type in which one main pipe serves as both an outgoing pipe and a return pipe. A water-cooled heat pump type air conditioner 4 may be connected to the main pipe. Furthermore, it is also free to provide a pressure increasing water pump in the return pipe 2b. The return pipe 2b of the present invention includes, for example, both a return pipe of a main pipe and a return pipe of a branch pipe branched in parallel from the main pipe.

1 is an overall simplified explanatory diagram of a large temperature difference water heat source air conditioning system. It is a principal part simplified explanatory view of a large temperature difference water heat source air conditioning system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat source machine 2 Heat source water circuit 2b Return pipe 4 Water cooling heat pump type air conditioner 6 Heat pump 13 Water cooling heat pump type heat recovery machine 16 C system water channel 17 HP system water channel 19 Cold / hot water coil type air conditioner

Claims (2)

  The heat source device 1 and a heat source water circuit 2 through which the heat source water whose temperature is adjusted by the heat source device 1 flow are provided, and the heat source water circuit 2 is connected to one or a plurality of cold / hot water coil air conditioners 19. The C-type water channel 16 and the HP-type water channel 17 to which one or a plurality of water-cooled heat pump air conditioners 4 are connected, and the outlet of the C-type water channel 16 and the inlet of the HP-type water channel 17 are connected. The water-cooled heat pump type air conditioner 4 is configured to air-condition a predetermined zone of the air-conditioned space with the cold / hot water coil type air conditioner 19 and to air-condition a different zone with the water-cooled heat pump type air conditioner 4. Heat source air conditioning system.   Predetermined heat source water temperature difference between the function of exhausting air from the air-conditioned space to the return pipe 2b downstream of the HP water channel 17 of the heat source water circuit 2 and the outdoor exhaust air and the heat source water from the return pipe 2b The large temperature difference water heat source air conditioning system of Claim 1 which connected the water cooling heat pump type heat recovery machine 13 which has the heat pump 6 which carries out heat transfer so that it may become.

Images