JP3997482B2 - Water source air conditioning system - Google Patents

Description

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

  As a water heat source air conditioning system using a water-cooled heat pump type air conditioner, there is one disclosed in JP-A-6-341683. In this system, multiple water-cooled heat pump air conditioners are connected in series to the heat source water channel, and the heat source water must be sent through the upstream water-cooled heat pump air conditioner before it can be sent to the downstream water-cooled heat pump air conditioner. In addition, the flow rate cannot be adjusted individually.

  In such a water-cooled heat pump type air conditioner, the cooling / heating capacity varies greatly depending on the degree of the inlet water temperature of the heat source water, and if the inlet water temperature is too high or too low, the heat pump compressor control alone will give the desired cooling / heating capacity. It may not be obtained or the compressor may not work. In addition, when the number of water-cooled heat pump air conditioners connected to the same heat source water circuit increases, fluctuations in the inlet water temperature of the heat source water increase on the upstream side and the downstream side, which causes a problem of uneven performance. Furthermore, if even one of the water-cooled heat pump type air conditioners breaks down, there is a problem that the heat source water cannot be circulated and the operation of all the air conditioners must be stopped.

JP-A-6-341683

  The problem to be solved is that the fluctuation of the inlet water temperature of the heat source water greatly affects the capacity of the water-cooled heat pump type air conditioner, and that emergency response is not possible when the water-cooled heat pump type air conditioner fails.

  In order to solve the above-mentioned problem, the present invention is configured to connect a bypass pipe to the heat source water circuit, provide a flow control valve in the bypass pipe, and provide a heat source of the water-cooled heat pump air conditioner upstream of the flow control valve in the bypass pipe. An inlet water temperature that is connected to a water inlet passage, connects a downstream portion of the bypass pipe from the flow rate control valve to a heat source water outlet passage of the water-cooled heat pump air conditioner, and detects a heat source water inlet temperature of the water-cooled heat pump air conditioner And an outlet water temperature detector for detecting the temperature of the heat source water outlet of the water-cooled heat pump air conditioner, and based on the heat source water inlet temperature and the heat source water outlet temperature detected by these detectors. A control means for adjusting the capacity by controlling the flow rate control valve to increase or decrease the amount of heat source water to the water-cooled heat pump type air conditioner is provided, and the upstream side connecting portion of the bypass pipe in the heat source water circuit Between the downstream-side connecting portion, and most main feature in that a closing valve.

In the first aspect of the present invention, even if there is a change in the inlet water temperature of the heat source water, the flow control valve 12 is controlled to adjust the capacity by increasing or decreasing the amount of the heat source water to the water-cooled heat pump type air conditioner 4, so a wide water temperature range Thus, the desired air conditioning capacity can be obtained without shortage, and the load on the compressor can be reduced, resulting in energy saving . Thousands and one water-cooled heat pump type air conditioner 4 and the flow control valve 12 fails, can flow by short-circuiting the heat source water by opening the on-off valve 18, it is not necessary to stop operation of the other air conditioner 4 .
According to the second and third aspects of the present invention, even if the number of water-cooled heat pump air conditioners 4 connected to the same heat source water circuit 2 increases and the heat source water inlet temperature fluctuates greatly, the water source temperature is controlled by individual water amount control. By adjusting the capacity of the air-conditioning system, it is possible to reduce the unevenness in the performance of the water-cooled heat pump air conditioners and to achieve stable air conditioning.
In the invention of claim 2 , since it is a single pipe type and the flow rate balance of the heat source water can be obtained, the direct return method can be used, the piping distance is shortened, and the equipment cost can be reduced.
In the invention of claim 3 , since the heat source water of the water-cooled heat pump type air conditioner 4 is introduced from the return pipe 2b instead of the forward pipe, the fluctuation of the heat source water inlet temperature with respect to the cold / hot water coil type air conditioner 19, that is, uneven performance. The water-cooled heat pump type air conditioner 4 can be used in combination without affecting the above. Since the cooling / heating coil-type air conditioner 19 and the water-cooled heat pump-type air conditioner 4 can perform simultaneous cooling and heating operations, it is possible to easily cope with cases where local cooling is necessary even in winter, and only supply cold water or hot water from the heat source machine. Since it is good, the operating cost of the heat source machine can be suppressed. When performing cooling and heating simultaneous operation between water-cooled heat pump air conditioners, the heat source load can be reduced. Since the water-cooled heat pump 6 introduces and returns the heat source water from only one return pipe, the pipe is simpler and shorter than the case where it is introduced from the forward pipe and returned to the return pipe, and only the return pipe 2b is required. There are few place restrictions. Furthermore, at the time of renewal or the like, the existing heat source water circuit 2 for the cold / hot water coil type air conditioner 19 can be used as it is, and the water cooling heat pump type air conditioner 4 can be added, and the equipment cost can be reduced.
According to the invention of claim 4 , according to the degree of the inlet water temperature of the heat source water, at the heat source water inlet temperature having a low heat exchange efficiency, the capacity can be automatically increased by increasing the amount of water, and the heat source water inlet having a high heat exchange efficiency. While maintaining a constant COP at the temperature, it is possible to automatically reduce the amount of water, that is, to reduce the load of the water supply water pump.

  1 and 2 show an embodiment of a water heat source air conditioning system of the present invention. This water heat source air conditioning system is a heat source water circuit through which a heat source unit 1 and heat source water whose temperature is adjusted by the heat source unit 1 flow. 2, a water supply pump 3 for sending the heat source water in the direction of the arrow, and a water-cooled heat pump type air conditioner 4 having a heat source water inlet / outlet connected to the heat source water circuit 2. The heat source unit 1 is configured so that the heat source water can be switched between hot water and cold water by a hot water boiler, a cooling tower or chiller for cold water, and a switching mechanism (not shown).

  The water-cooled heat pump type air conditioner 4 is provided with a water-cooled heat pump 6 and an air supply blower 7 in a casing 5, and the air inlet of the water-cooled heat pump type air conditioner 4 is used for return air intake or outside air intake via a duct or the like. The air outlet of the water-cooled heat pump type air conditioner 4 communicates with the air-conditioned space such as the room via a duct for supplying air. The water-cooled heat pump 6 includes a water heat exchanger 8 that exchanges heat of refrigerant with heat source water, an air heat exchanger 9 that exchanges heat of air-conditioning air using refrigerant, a compressor 10, an expansion valve, and a refrigerant circulation direction. The reversing switching valve (four-way valve) and a liquid receiver (not shown) are connected to each other to form a refrigerant circulation circuit, and the heat absorption of the water heat exchanger 8 and the air heat exchanger 9 is achieved by the switching valve. Heat dissipation (evaporation function and condensation function) can be switched. The air heat exchanger 9 of the water-cooled heat pump 6 cools or heats the air-conditioning air so that the cooling operation and the heating operation can be switched freely, and the air-conditioned space is supplied and air-conditioned. When an example of the use limit water temperature range of the heat source water when performing cooling and heating with this water cooling heat pump 6 is raised, it is 10 ° C to 45 ° C. The water heat exchanger 8 can be of any type such as a double pipe type, a plate type, or other various structures.

  A bypass pipe 11 is connected to the heat source water circuit 2, a flow control valve 12 is provided in the bypass pipe 11, and a heat source of the water-cooled heat pump 6 of the water-cooled heat pump type air conditioner 4 is disposed upstream of the flow control valve 12 in the bypass pipe 11. Connected to the water inlet path, connected downstream of the flow control valve 12 in the bypass pipe 11 to the heat source water outlet path of the water cooled heat pump 6 of the water-cooled heat pump type air conditioner 4, and connected upstream of the bypass pipe 11 in the heat source water circuit 2 An on-off valve 18 is provided between the part and the downstream connection part. The flow control valve 12 and the on-off valve 18 may be two-way valves. The release valve 18 is normally closed and opened when the water-cooled heat pump 6 or the flow control valve 12 breaks down, and emergency measures can be taken so that the heat source water circuit 2 is not clogged. When the operation of the water-cooled heat pump 6 is stopped by the control means 17 which will be described later, the flow control valve 12 is fully opened so that the heat source water does not flow into the water heat exchanger 8 due to its internal resistance, and the water-cooled heat pump 6 is operated. Adjusts the opening so that a predetermined flow rate of heat source water flows to the water heat exchanger 8. Therefore, even if a water supply pump is not provided between the heat source water circuit 2 and the water-cooled heat pump 6, the heat source water can be diverted and allowed to flow through the water-cooled heat pump 6 by a necessary amount.

  An inlet water temperature detector 15 for detecting the heat source water inlet temperature of the water cooling heat pump 6 of the water cooling heat pump air conditioner 4 is provided in the heat source water inlet path and the heat source water outlet path of the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4. In addition, an outlet water temperature detector 16 for detecting the heat source water outlet temperature of the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4 is provided, and the heat source water inlet temperature and the heat source water outlet temperature detected by these detectors 15 and 16 are provided. Based on this, a control means 17 is provided for controlling the flow rate control valve 12 to adjust the capacity by increasing or decreasing the amount of heat source water to the water-cooled heat pump 6 of the water-cooled heat pump type air conditioner 4. Specifically, the difference between the heat source water inlet temperature and the heat source water outlet temperature detected by the inlet water temperature detector 15 and the outlet water temperature detector 16 is calculated, and this calculated value is determined in advance according to the heat source water inlet temperature. The control means 17 controls the flow rate control valve 12 so as to have a set temperature difference set value. In the cooling operation, the amount of heat source water to the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4 as the heat source water inlet temperature increases. In the heating operation, the temperature difference set value is determined such that the amount of heat source water to the water cooled heat pump 6 of the water cooled heat pump type air conditioner 4 increases as the temperature of the heat source water inlet decreases. Determine.

  When the temperature difference of the heat source water inlet / outlet becomes smaller as the amount of heat source water to the water-cooled heat pump 6 increases and the temperature difference becomes larger, the amount of heat source water decreases, for example, when the heat source water inlet temperature becomes low in heat exchange efficiency. Automatically increases the capacity by increasing the amount of water, and when the heat source water inlet temperature has a high heat exchange efficiency, a temperature difference set value is selected so as to reduce the water amount while maintaining a constant COP. It is also possible to adjust the capacity by controlling the flow rate control valve 12 by a method other than the above to increase or decrease the amount of heat source water to the water-cooled heat pump 6 of the water-cooled heat pump type air conditioner 4. As an example, the inlet water temperature detector 15 and the outlet water temperature detector 16 detect the heat source water inlet temperature and the heat source water outlet temperature, and the heat source water outlet temperature is predetermined according to the heat source water inlet temperature. The control means 17 controls the flow rate control valve 12 so that the heat source water outlet temperature set value is set, and in the cooling operation, the amount of heat source water to the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4 as the heat source water inlet temperature increases. The heat source water outlet temperature set value is determined so as to increase, and in the heating operation, the amount of heat source water to the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4 increases as the heat source water inlet temperature decreases. Set the outlet temperature setpoint.

  In FIG. 2, a plurality of water-cooled heat pump type air conditioners 4 are provided, and the heat source water circuit 2 is a single pipe type in which one main pipe serves as both an outgoing pipe and a return pipe. Is connected to the main pipe via a separate bypass pipe 11, and the heat source water flows through each of the water-cooled heat pump air conditioners one by one, and each water-cooled heat pump air conditioner 4 has a flow control valve 12 and An inlet water temperature detector 15 for detecting the heat source water inlet temperature and an outlet water temperature detector 16 for detecting the heat source water outlet temperature are provided, and each of the water-cooled heat pump air conditioners detected by these detectors 15 and 16 is provided. Control for individually adjusting the capacity by individually controlling the flow rate control valve 12 corresponding to each of the heat source water inlet temperature and the heat source water outlet temperature for every four to increase or decrease the amount of heat source water to each water-cooled heat pump type air conditioner 4 Means 17; To have.

  When cooling operation is performed with all water-cooled heat pump air conditioners 4, heat source water is passed to the water heat exchanger 8 of the air conditioner 4, and the circulating refrigerant in the water-cooled heat pump 6 condenses (heatsinks) in the water heat exchanger 8 to exchange air heat. The refrigerant 9 functions so as to evaporate (heat absorption), the circulating refrigerant is condensed with the heat source water, and the air heat exchanger 9 cools the air-conditioning air. The heat source water that has entered the water heat exchanger 8 from the heat source water circuit 2 rises in temperature due to the refrigerant heat dissipation action and returns to the heat source water circuit 2, but the heat source water inlet temperature of the air conditioner 4 increases as it goes downstream. The control means 17 controls the flow rate control valve 12 corresponding to each air conditioner 4 to adjust the heat source water amount. The heat source water output from the water heat exchanger 8 to the heat source water circuit 2 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 with all the water-cooled heat pump type air conditioners 4, the heat source water is supplied to the water heat exchanger 8 of the air conditioner 4, and the circulating refrigerant of the water-cooled heat pump 6 is evaporated (heat absorption) in the water heat exchanger. The refrigerant is allowed to condense (heat radiation) in order to evaporate the circulating refrigerant with the heat source water, and the air heat exchanger 9 heats the air for air conditioning. The heat source water that has entered the water heat exchanger 8 from the heat source water circuit 2 drops in temperature due to the refrigerant evaporating action and returns to the heat source water circuit 2, but the heat source water inlet temperature of the air conditioner 4 decreases as it goes downstream. The control means 17 controls the flow rate control valve 12 corresponding to each air conditioner 4 to adjust the heat source water amount. The heat source water output from the water heat exchanger 8 to the heat source water circuit 2 returns to the heat source unit 1 to be temperature-adjusted and circulates in the heat source water circuit 2.

  When the cooling operation is performed with an appropriate number of water-cooled heat pump air conditioners 4 and the heating operation is performed simultaneously with an appropriate number of water-cooled heat pump air conditioners 4 due to a local increase in temperature difference, the heat source of the water-cooled heat pump air conditioner 4 By arranging the water-cooled heat pump type air conditioner 4 for cooling operation and the water-cooled heat pump type air conditioner 4 for heating operation in combination so that the water inlet temperature does not fall outside the usable water temperature range, a plurality of water-cooled heat pump type air conditioners 4 are arranged. Since the heat source load is offset by the mutual heat transfer and becomes smaller, it is possible to save energy, use an inexpensive cooling tower, etc., and reduce the equipment cost.

  FIG. 3 includes a plurality of water-cooled heat pump type air conditioners 4, and the heat source water circuit 2 is a two-pipe type of the forward pipe 2 a and the return pipe 2 b, and the heat source water of one or a plurality of cold / hot water coil type air conditioners 19. The inlet / outlet is connected in parallel to the forward pipe 2a and the return pipe 2b, the heat source water inlet / outlet of each water-cooled heat pump air conditioner 4 is connected to the return pipe 2b via a separate bypass pipe 11, and each water-cooled heat pump air conditioner 4 is connected. Are provided with a flow rate control valve 12, an inlet water temperature detector 15 for detecting the heat source water inlet temperature, and an outlet water temperature detector 16 for detecting the heat source water outlet temperature, which are detected by these detectors 15, 16. In addition, the flow rate control valve 12 corresponding to each water-cooled heat pump air conditioner 4 is individually controlled based on the heat source water inlet temperature and the heat source water outlet temperature for each water-cooled heat pump air conditioner 4 to increase or decrease the amount of heat source water to each water-cooled heat pump air conditioner 4. Control means to adjust the ability individually 7, it is obtained by. 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 to switch between cooling operation and heating operation, 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.

  When performing the cooling operation with the cold / hot water coil type air conditioner 19, heat source water (cold water) is supplied to the forward pipe 2 a to cool the air-conditioning air with the cold / hot water coil of the cold / hot water coil type air conditioner 19. The heat source water that has entered the cold / hot water coil of the cold / hot water coil air conditioner 19 from the forward pipe 2a absorbs heat from the air-conditioning air, rises in temperature (for example, from 7 to 10 ° C. to 12 to 15 ° C.), and returns to the return pipe 2b. The heat source water of the return pipe 2b is supplied to the water heat exchanger 8 of the water-cooled heat pump type air conditioner 4, and the cooling operation or the heating operation is performed as in the above embodiment. The heat source water discharged from the water heat exchanger 8 to the return pipe 2b is returned to the heat source unit 1 to adjust the temperature and circulate in the heat source water circuit 2.

  When performing the heating operation with the cold / hot water coil type air conditioner 19, the heat source water (hot water) is supplied to the forward pipe 2 a and the air for air conditioning is heated by the cold / hot water coil of the cold / hot water coil type air conditioner 19. The heat source water that has entered the cold / hot water coil of the cold / hot water coil type air conditioner 19 from the forward pipe 2a dissipates heat to the air-conditioning air and drops in temperature (for example, from 40 to 45 ° C. to 35 to 40 ° C.) and returns to the return pipe 2b. The heat source water of the return pipe 2b is supplied to the water heat exchanger 8 of the water-cooled heat pump type air conditioner 4, and the cooling operation or the heating operation is performed as in the above embodiment. The heat source water discharged from the water heat exchanger 8 to the return pipe 2b is returned to the heat source unit 1 to adjust the temperature and circulate in the heat source water circuit 2.

  As described above, the water-cooled heat pump 6 cools (cools) and heats (heats) the air-conditioning air, so that the usable water temperature range of the heat source water is wider than that of the cold / hot water coil of the cold / hot water coil air conditioner 19. Cooling (cooling) and heating with a water-cooled heat pump 6 using heat source water (temperature that cannot be cooled and heated by the cold / hot water coils of other cold / hot water coil air conditioners 19) from the cold / hot water coil of the coil air conditioner 19 (Heating) can be performed. Therefore, the existing air conditioner and the heat source water circuit can be maintained as they are, and the capacity can be increased by adding the water-cooled heat pump type air conditioner 4, and the construction can be easily performed and renewed at a low cost.

  4, in each of the above embodiments, the flow rate control valve 12 is provided in the heat source water circuit 2 (the main pipe in the one-pipe type in FIG. 1 and the return pipe 2 b in the two-pipe type in FIG. 3) to control the flow rate in the heat source water circuit 2. The upstream part from the valve 12 is connected to the heat source water inlet passage of the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4, and the downstream part from the flow control valve 12 in the heat source water circuit 2 is the heat source of the water cooling heat pump 6 of the water cooling heat pump type air conditioner 4. In the embodiment connected to the water outlet passage, the other configurations are the same as those in the embodiment described above, and will be omitted.

  In each of the above embodiments, the number of water-cooled heat pump air conditioners 4 and cold / hot water coil air conditioners 19 can be freely increased or decreased. 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 thereof. 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. In addition, a water-cooled heat pump type air conditioner 4, a flow control valve 12, an on-off valve 18, a bypass pipe 11, and the like are provided not on the return pipe 2b of the two-pipe heat source water circuit 2 in the embodiment of FIG. Is also free.

It is a principal part simplified explanatory view of a water heat source air-conditioning system. 1 is an overall simplified explanatory diagram of a water heat source air conditioning system. It is the whole simplified explanatory drawing of another water-source air-conditioning system. It is a principal part simplified explanatory view of another water heat source air-conditioning system.

Explanation of symbols

2 Heat source channel 2b Return pipe 4 Water-cooled heat pump type air conditioner 11 Detour pipe 12 Flow control valve 15 Inlet water temperature detector 16 Outlet water temperature detector 17 Control means 18 On-off valve 19 Cold / hot water coil type air conditioner

Claims (4)

  A bypass pipe 11 is connected in communication with the heat source water circuit 2, a flow control valve 12 is provided in the bypass pipe 11, and an upstream portion of the bypass pipe 11 from the flow control valve 12 is a heat source water inlet path of the water-cooled heat pump air conditioner 4. To the heat source water outlet path of the water-cooled heat pump air conditioner 4 and to detect the heat source water inlet temperature of the water-cooled heat pump air conditioner 4 A water temperature detector 15 and an outlet water temperature detector 16 for detecting the heat source water outlet temperature of the water-cooled heat pump type air conditioner 4 are provided, and the heat source water inlet temperature and the heat source detected by these detectors 15 and 16 are provided. Control means 17 for adjusting the capacity by controlling the flow rate control valve 12 based on the water outlet temperature to increase or decrease the amount of heat source water to the water-cooled heat pump type air conditioner 4 is provided. Between the upstream-side connecting portion and the downstream-side connecting portion of the bypass pipe 11 at 2, water heat source air conditioning system, characterized in that a closing valve 18. A plurality of water-cooled heat pump type air conditioners 4 are provided, and the heat source water circuit 2 is a single pipe type in which one main pipe also serves as an outgoing pipe and a return pipe, and the heat source water inlet / outlet of each of the water cooled heat pump type air conditioners 4 is the main pipe. Are connected via separate bypass pipes 11, and each water-cooled heat pump type air conditioner 4 has a flow rate control valve 12, an inlet water temperature detector 15 for detecting the heat source water inlet temperature, and an outlet for detecting the heat source water outlet temperature. A water temperature detector 16, and the corresponding flow rate control based on the heat source water inlet temperature and the heat source water outlet temperature for each of the water-cooled heat pump air conditioners 4 detected by the detectors 15, 16. The water heat source air conditioning system according to claim 1, wherein the control means 17 is configured to individually adjust the capacity by individually controlling the valves 12 to increase or decrease the amount of heat source water to each of the water cooled heat pump type air conditioners 4 . A plurality of water-cooled heat pump type air conditioners 4 are provided, the heat source water circuit 2 is a two-pipe type of the forward pipe 2a and the return pipe 2b, and the heat source water inlet / outlet of one or a plurality of cold / hot water coil type air conditioners 19 is provided. 2a and the return pipe 2b are connected in parallel, the heat source water inlet / outlet of each of the water-cooled heat pump type air conditioners 4 is connected to the return pipe 2b via a separate bypass pipe 11, and each of the water-cooled heat pump type air conditioners 4 is connected. The flow rate control valve 12, the inlet water temperature detector 15 for detecting the heat source water inlet temperature, and the outlet water temperature detector 16 for detecting the heat source water outlet temperature are provided and detected by these detectors 15, 16. Based on the heat source water inlet temperature and the heat source water outlet temperature for each water-cooled heat pump air conditioner 4, the corresponding flow control valves 12 are individually controlled to increase or decrease the amount of heat source water to each water-cooled heat pump air conditioner 4. Let the ability individually And a control means 17 for section water heat source air conditioning system of claim 1, wherein the. The difference between the heat source water inlet temperature and the heat source water outlet temperature detected by the inlet water temperature detector 15 and the outlet water temperature detector 16 is calculated, and this calculated value is a temperature difference determined in advance according to the heat source water inlet temperature. The control means 17 for controlling the flow rate control valve 12 to be a set value is used, and in the cooling operation, the temperature difference setting is performed so that the amount of heat source water to the water-cooled heat pump type air conditioner 4 increases as the temperature of the heat source water inlet increases. in the heating operation with determining the value of claims 1, 2 or 3, wherein the heat source water is defined the temperature difference setpoint to increase to the water-cooled heat pump type air conditioner 4 in accordance with the heat source water inlet temperature is lower Water source air conditioning system.

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