JP2009264682A - Water heat source air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heat source air conditioner capable of increasing a temperature range of water that can be used as heat source water by controlling the temperature of the heat source water flowing into a water heat exchanger, reducing power consumption, and increasing cooling and heating capacities. <P>SOLUTION: The water heat source air conditioner is equipped with: a heat pump unit 30 sequentially connecting by pipes a compressor 31, a four-way valve 32, the water heat exchanger 33, an expansion valve 34, and an air conditioning refrigerant heat exchanger 35; a fan coil unit 10 stored in the same box as the heat pump unit 30 and comprising a heat source water system 11 and a fan coil 12 through which the heat source water W supplied through the heat source water system 11 flows; a first opening and closing valve 13 provided between an inlet of the heat source water W and an inlet of the water heat exchanger 33; a second opening and closing valve 14 provided at a position for bypassing the inlet of the heat source water W and an outlet of the fan coil 12; a temperature sensor 15 provided between the inlet of the heat source water W and the first opening and closing valve 13; and a control means 16 for controlling the first opening and closing valve 13 and the second opening and closing valve 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a water heat source air conditioner.

  In buildings, etc., air conditioning is achieved by circulating cold / hot water in a heat storage tank (hereinafter referred to as “heat source water”) to a fan coil unit or a water heat source heat pump unit that is placed in a room subject to air conditioning in the building. A water heat source air conditioning system is widely used.

  In the former method using the fan coil unit, heat source water in the heat storage water tank is circulated through an air conditioning coil (air-to-water heat exchanger) to exchange heat between the air and the heat source water. The advantage of this method is that it is inexpensive.

  On the other hand, the latter water heat source heat pump unit circulates the heat source water in the water side heat exchanger, this water side heat exchanger is a condenser or an evaporator, and the air side heat exchanger is an evaporator or a condenser. This is a system in which cold air or hot air is obtained with an air-side heat exchanger using heat source water as a heat source. The advantage of this method can be that heat can be used comprehensively without waste when the waste heat recovery in the building and the cooling operation and the heating operation coexist.

  For this reason, the former and the latter methods are often used in combination, but the machine room and equipment for installing heat source equipment such as refrigerators and cooling towers become large, and the leveling of power consumption for air conditioning is reduced. There is also a problem with difficulty.

Therefore, in Patent Document 1 shown below, in order to solve these problems, by switching the three-way valve, the operation in which the heat source water passes through both the fan coil and the water heat exchanger, and the fan coil is bypassed. Thus, a water heat source air conditioner that can perform two types of operation, that is, an operation in which heat source water passes only through a water heat exchanger, is disclosed. When cooling operation is performed when the temperature of the heat source water is high and heating operation is performed when the temperature of the heat source water is low, the latter, that is, the fan coil is bypassed and only the water heat exchanger is allowed to pass the heat source water. To operate the heat pump refrigeration cycle.
Japanese Patent Publication No. 7-104019

  However, in the water heat source air conditioner disclosed in Patent Document 1 described above, the following points are not considered.

  That is, when performing cooling operation when the temperature of the heat source water is high and heating operation when the temperature of the heat source water is low, for example, the temperature of the heat source water that passes through the water heat exchanger that acts as a condenser in the cooling operation If it is high, the operating efficiency is lowered, and the compressor often stops because the condensation pressure exceeds the design value.

  On the other hand, if the temperature of the heat source water passing through the water heat exchanger that acts as an evaporator in the heating operation is low, not only the operation efficiency is lowered, but also the water heat exchanger freezes and the refrigerant backs up. It happens.

  The present invention has been made to solve the above problems, and the object of the present invention is to expand the temperature range of water that can be used as heat source water by adjusting the temperature of the heat source water flowing into the water heat exchanger. Another object is to provide a water heat source air conditioner that can reduce power consumption and increase air conditioning capability.

  A first feature according to an embodiment of the present invention is that, in a water heat source air conditioner, a compressor, a four-way valve, a water heat exchanger that exchanges heat between the heat source water and the refrigerant, an expansion valve, and refrigerant heat for air conditioning A heat pump unit in which exchangers are connected by piping, a heat source water system that is housed in the same housing as the heat pump unit, and a fan coil through which the heat source water supplied through the heat source water system passes. A fan coil unit, a first on-off valve provided between the inlet of the heat source water and the inlet of the water heat exchanger, and a second provided at a position bypassing the inlet of the heat source water and the outlet of the fan coil. An on-off valve, a temperature sensor provided between the inlet of the heat source water and the first on-off valve, and control means for controlling the first on-off valve and the second on-off valve based on information from the temperature sensor; Is provided.

  The second feature of the embodiment of the present invention is that, in the water heat source air conditioner, the compressor, the four-way valve, the water heat exchanger for exchanging heat between the heat source water and the refrigerant, the expansion valve, and the refrigerant heat for air conditioning A heat pump unit in which exchangers are connected by piping, a heat source water system that is housed in the same housing as the heat pump unit, and a fan coil through which the heat source water supplied through the heat source water system passes. Water heat exchange, a fan coil unit, an on-off valve provided between the inlet of the heat source water and the inlet of the water heat exchanger, a flow rate adjusting valve provided between the inlet of the heat source water and the inlet of the fan coil A temperature sensor provided at a position where the heat source water that has passed through the on-off valve and the heat source water that has passed through the fan coil are mixed just before the inlet of the vessel, and the on-off valve and the flow rate adjustment valve based on information from the temperature sensor Control system And means.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature range of the water which can be used as heat source water can be expanded by adjusting the temperature of the heat source water which flows into a water heat exchanger, and also reduction of power consumption and increase in air conditioning capability can be aimed at. A water heat source air conditioner can be provided.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic diagram showing an overall configuration of a water heat source air conditioner 1 according to a first embodiment of the present invention.

  As shown in FIG. 1, the water heat source air conditioner 1 is roughly composed of a fan coil unit 10 and a heat pump unit 30. In the embodiment of the present invention, the fan coil unit 10 and the heat pump unit 30 are housed in the same housing, but both units may be installed as separate units.

  The fan coil unit 10 includes a heat source water system 11 through which heat source water W stored in a heat storage water tank (not shown) is passed, a fan coil 12, a first on-off valve 13, and a second on-off valve 14. And a temperature sensor 15 and a control means 16 for controlling the opening and closing of the first on-off valve 13 and the second on-off valve 14.

  The fan coil 12 is a so-called heat exchanger, and performs heat exchange with indoor air using heat of heat source water that passes through the heat source water system 11.

  The first on-off valve 13 is provided between the inlet of the heat source water W and the inlet of the water heat exchanger constituting the heat pump unit 30 (denoted as “SV1” in FIG. 1). The second on-off valve 14 is provided at a position that bypasses the inlet of the heat source water W and the outlet of the fan coil 12 (indicated as “SV2” in FIG. 1). The temperature sensor 15 is provided between the inlet of the heat source water W and the first on-off valve 13 and measures the temperature of the heat source water W. The first on-off valve 13 and the second on-off valve 14 use, for example, an electric water two-way valve in the embodiment of the present invention, but the heat source water W flowing in the heat source water system 11 is used. Any valve can be used as long as it can control the flow.

  The first on-off valve 13, the second on-off valve 14, and the temperature sensor 15 are connected to the control means 16. The control means 16 controls the opening / closing of the first on-off valve 13 and the second on-off valve 14 based on the temperature information of the heat source water W from the temperature sensor 15. In FIG. 1, the control means 16 is described as being connected to and controlling only the above-described three components, but other components such as a blower 20 and a heat pump unit 30 described later are described. It also controls the compressor and four-way valve that make up.

  The heat pump unit 30 includes a compressor 31, a four-way valve 32, a water heat exchanger 33 that exchanges heat between the heat source water W and the refrigerant, an expansion valve 34, and an air conditioning refrigerant heat exchanger 35. The heat pump type refrigeration cycle S is configured by connecting these components sequentially by piping. In the heat pump refrigeration cycle S, the refrigerant circulates. The heat source water system 11 disposed in the fan coil unit 10 is connected to the water heat exchanger 33 and supplied with heat source water W. In the water heat exchanger 33, heat is exchanged between the refrigerant and the heat source water W.

  Next, the operation flow of the water heat source air conditioner 1 shown in FIG. 1 will be described for each operation mode. FIG. 2 shows the operation modes performed in the water heat source air conditioner 1 according to the embodiment of the present invention and the valve operations of the first on-off valve 13 and the second on-off valve 14 when the respective operation modes are performed. It is a table | surface which shows a relationship. In FIG. 2, the first on-off valve 13 is represented as “SV1”, and the second on-off valve 14 is represented as “SV2”.

  First, the “fan coil single operation” mode will be described. When only the fan coil unit 10 is operated and the heat pump unit 30 is not operated, the control means 16 performs control for closing both the first on-off valve 13 and the second on-off valve 14. By performing such control, the entire amount of the heat source water W is circulated through the heat source water system 11 in the order of the fan coil 12 and the water heat exchanger 33. Thereby, the cooling according to the water temperature of the heat source water W or the heating effect can be exhibited. The heat source water W that has passed through the fan coil 12 is discharged outside the water heat source air conditioner 1 without exchanging heat with the refrigerant of the heat pump refrigeration cycle S in the water heat exchanger 33.

  Next, the case of the “fan coil + heat pump operation” mode will be described. This operation mode is a mode in which the operation of the heat pump unit 30 is added to the above-described “fan coil single operation” and both units are operated. Therefore, both the first on-off valve 13 and the second on-off valve 14 are closed. Control is performed. By closing both the on-off valves, the entire amount of the heat source water W circulates in the heat source water system 11 in the order of the fan coil 12 and the water heat exchanger 33. Further, since the heat pump unit 30 is also operated in this operation mode, heat exchange is performed between the refrigerant and the heat source water W in the water heat exchanger 33. The heat source water W sent to the water heat exchanger 33 is used as cooling water during cooling operation or heat source water during heating operation. Thereafter, the heat source water W that has undergone heat exchange is discharged to the outside of the water heat source air conditioner 1.

  When the cooling operation is performed using the water source air conditioner 1 when the water temperature of the heat source water W is high, the operation efficiency is reduced as described above, and the condensing pressure exceeds the design value. It is also possible to stop. Therefore, when the cooling operation is performed in such a state, the control means 16 performs the control described below. In addition, when the water temperature of this heat source water W is high, the operation mode when performing the cooling operation using the water heat source air conditioner 1 is expressed as “intermediate cooling operation” as shown in the table of FIG. 2 for convenience.

  The control means 16 determines whether or not to perform the intermediate cooling operation based on the temperature information of the heat source water W from the temperature sensor 15. Here, the temperature of the heat source water W, which is a criterion for determining whether to shift to the intermediate cooling operation, can be arbitrarily determined in advance, for example, 25 ° C. Therefore, in this case, when the temperature of the heat source water W is 25 ° C. or higher, the intermediate phase cooling operation is started.

  When the intermediate cooling operation is performed, the control unit 16 performs control to open the first on-off valve 13 and close the second on-off valve 14. By performing such control, the heat source water W sent to the fan coil unit 10 is passed through the fan coil 12 (such as this) because the second on-off valve 14 is closed. The heat source water W is referred to as “heat source water W1” for the sake of convenience), and the first on-off valve 13 that is opened according to the pressure loss difference between the fan coil 12 and the water heat exchanger 33 is not directly directed to the fan coil 12 but directly Water is passed through the exchanger 33 (such heat source water W is referred to as “heat source water W2” for convenience).

  The temperature of the heat source water W <b> 1 that has passed through the fan coil 12 decreases due to heat exchange in the fan coil 12. On the other hand, the heat source water W2 that has passed through the first on-off valve 13 goes to the water heat exchanger 33 while maintaining its temperature. However, since the heat source water W1 and the heat source water W2 are mixed immediately before the water heat exchanger 33, the temperature of the heat source water W2 decreases. Therefore, the heat source water W3 having a temperature lower than the temperature of the heat source water W2 supplied to the water heat source air conditioner 1 is supplied to the water heat exchanger 33. The heat source water W <b> 3 supplied to the water heat exchanger 33 is further exchanged with the refrigerant of the heat pump unit 30 and discharged outside the water heat source air conditioner 1.

  On the other hand, when the heating operation is performed using the water source air conditioner 1 when the water temperature of the heat source water W is low, the operation efficiency decreases as described above, and the phenomenon such as freezing of the water heat exchanger and liquid back of the refrigerant occurs. It is also possible to cause Therefore, when the heating operation is performed in such a state, the control means 16 performs the control described below. In addition, when the water temperature of this heat source water W is low, the operation mode when performing the heating operation using the water heat source air conditioner 1 is expressed as “intermediate heating operation” as shown in the table of FIG. 2 for convenience.

  The control means 16 determines whether to perform the intermediate heating operation based on the temperature information of the heat source water W from the temperature sensor 15. Here, the temperature of the heat source water W, which is a criterion for determining whether to shift to the intermediate cooling operation, can be arbitrarily determined in advance, for example, 25 ° C. Therefore, in this case, when the temperature of the heat source water W is less than 25 ° C., the intermediate period heating operation is started.

  When the intermediate heating operation is performed, the control unit 16 performs control to open the first on-off valve 13 and close the second on-off valve 14. By performing such control, the heat source water W sent to the fan coil unit 10 is passed through the fan coil 12 (such as this) because the second on-off valve 14 is closed. The heat source water W is referred to as “heat source water W1” for the sake of convenience), and the first on-off valve 13 that is opened according to the pressure loss difference between the fan coil 12 and the water heat exchanger 33 is not directly directed to the fan coil 12 but directly Water is passed through the exchanger 33 (such heat source water W is referred to as “heat source water W2” for convenience).

  The temperature of the heat source water W <b> 1 that has passed through the fan coil 12 rises due to heat exchange in the fan coil 12. On the other hand, the heat source water W2 that has passed through the first on-off valve 13 goes to the water heat exchanger 33 while maintaining its temperature. However, since the heat source water W1 and the heat source water W2 are mixed immediately before the water heat exchanger 33, the temperature of the heat source water W2 rises. Therefore, the heat source water W having a temperature higher than the temperature of the heat source water W1 passed through the fan coil 12 is supplied to the water heat exchanger 33. The heat source water W supplied to the water heat exchanger 33 is further subjected to heat exchange with the refrigerant of the heat pump unit 30 and discharged to the outside of the water heat source air conditioner 1.

  In the case of “air blowing operation”, the control means 16 controls so that both the first on-off valve 13 and the second on-off valve 14 are opened. By opening both on-off valves, almost all of the heat source water W is supplied to the water heat exchanger 33. Therefore, the heat source water W is not supplied to the fan coil 12.

  By adopting the configuration and operation control method as described above, it is possible to adjust the temperature of the heat source water flowing into the water heat exchanger in the heat pump unit. Therefore, heat source water at a temperature that could not be used with fan coil units and heat pump units until now can be used, and the amount of heat source water to be discarded by expanding the usable temperature range. Therefore, it is possible to provide a water heat source air conditioner that contributes to energy saving. In addition, since water source water having the optimum temperature for the operation of the fan coil unit and the heat pump unit can be supplied to each unit, it is possible to achieve a reduction in power consumption and an increase in operation capacity for operation. Air conditioner can be provided. Furthermore, since it is not necessary to attach a water-saving valve externally at the time of air blowing operation, a water heat source air conditioner having a simple configuration can be provided.

  In addition, in the above description, the intermediate temperature cooling operation or the intermediate period heating operation has been described with a specific temperature of “25 ° C.”, but in any operation, the temperature at which the operation is shifted is arbitrary. Can be set to

  In the embodiment of the present invention, the temperature sensor 15 is provided and the operation mode is switched based on the temperature measured by the temperature sensor 15. However, for example, the operation mode is not provided without the temperature sensor. Switching may be performed manually by the user.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Note that, in the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description of the same components is omitted because it is duplicated.

  The difference from the first embodiment is the components of the fan coil unit 40 and their installation positions. The other main components are the same, such as other water heat source air conditioners including a fan coil unit and a heat pump unit.

  Specifically, as shown in the schematic diagram showing the overall configuration of the water heat source air conditioner 40 in the second embodiment of the present invention in FIG. 3, the fan coil unit 50 is installed in a heat storage water tank (not shown). The heat source water system 11 for passing the stored heat source water W through the unit, the fan coil 12, the on-off valve 51, the flow rate adjustment valve 52, the temperature sensor 53, the on-off valve 51 and the flow rate adjustment valve 52 are opened and closed. And control means 16 for controlling.

  The on-off valve 51 is provided between the inlet of the heat source water W and the inlet of the water heat exchanger 33 constituting the heat pump unit 30 (indicated as “SV” in FIG. 3). The flow rate adjusting valve 52 is provided at a position between the inlet of the heat source water W and the inlet of the fan coil 12 (indicated as “MV” in FIG. 3). The temperature sensor 53 is provided immediately before the inlet of the water heat exchanger 33 and is provided at a position where the heat source water W that has passed through the on-off valve 51 and the heat source water W that has passed through the fan coil 12 are mixed. The temperature of the heat source water W supplied to is measured.

  The on-off valve 51 uses, for example, an electric two-way water valve in the embodiment of the present invention, but any valve that can control the flow of the heat source water W flowing in the heat source water system 11 is used. You may use a simple valve. Further, in the embodiment of the present invention, for example, an electric proportional valve for water is used as the flow rate adjusting valve 52. However, any flow control valve 52 can control the flow rate of the heat source water W flowing in the heat source water system 11. Such a valve may be used.

  The on-off valve 51, the flow rate adjustment valve 52, and the temperature sensor 53 are connected to the control means 16. The control means 16 controls the opening / closing of the opening / closing valve 51 and the flow rate adjusting valve 52 based on the temperature information of the heat source water W from the temperature sensor 53. In FIG. 3, the control unit 16 is described as being connected to and controlling only the above-described three components. For example, each component configuring the blower 20 and the heat pump unit 30 described below. Used to control equipment.

  The heat source water system 11 disposed in the above-described fan coil unit 50 is connected to the water heat exchanger 33 which is one component device of the heat pump unit 30 and supplied with the heat source water W. In the water heat exchanger 33, heat is exchanged between the refrigerant and the heat source water W.

  Next, the operation flow of the water heat source air conditioner 40 shown in FIG. 3 will be described for each operation mode. FIG. 4 is a table showing the relationship between the operation modes performed in the water heat source air conditioner 40 according to the embodiment of the present invention and the valve operations of the on-off valve 51 and the flow rate adjustment valve 52 when the respective operation modes are performed. is there. In FIG. 4, the on-off valve 51 is represented as “SV” and the flow rate adjustment valve 52 is represented as “MV”.

  First, the “fan coil single operation” mode will be described. When only the fan coil unit 50 is operated and the heat pump unit 30 is not operated, the control means 16 closes the on-off valve 51, and the flow rate adjustment valve 52 depends on the capacity required for the water source air conditioner 40. Control to adjust the amount of opening is performed. By adjusting the amount of the heat source water W supplied to the fan coil 12 in accordance with the required capacity in this way, it is possible to finely control the cooling / heating capacity. The heat source water W that has passed through the fan coil 12 is discharged outside the water heat source air conditioner 40 without exchanging heat with the refrigerant of the heat pump refrigeration cycle S in the water heat exchanger 33.

  Next, the case of the “fan coil + heat pump operation” mode will be described. Since this operation mode is a mode in which the operation of the heat pump unit 30 is added to the above-described “fan coil single operation” and both units are operated, the control means 16 adjusts the flow rate so as to maximize the capability of the heat pump unit 30. The valve 52 is controlled.

  That is, control is performed so that the on-off valve 51 is closed and the flow rate adjustment valve 52 is fully opened. By performing such control, the entire amount of the heat source water W is supplied to the fan coil 12 in the heat source water system 11 and is also circulated to the water heat exchanger 33. Accordingly, the entire amount of the heat source water W supplied to the water heat source air conditioner 40 is supplied to the water heat exchanger 33, and maximum heat exchange is performed between the refrigerant and the heat source water W. The heat source water W sent to the water heat exchanger 33 is used as cooling water during cooling operation or heat source water during heating operation. Thereafter, the heat source water W that has undergone heat exchange is discharged to the outside of the water heat source air conditioner 40.

  When the cooling operation is performed using the water heat source air conditioner 40 when the water temperature of the heat source water W is high, the operation efficiency is reduced as described above, and the condensation pressure exceeds the design value. It is also possible to stop. Therefore, when the cooling operation is performed in such a state, the control means 16 performs the control described below. In addition, when the water temperature of this heat source water W is high, the operation mode when performing the cooling operation using the water heat source air conditioner 1 is expressed as “intermediate cooling operation” as shown in the table of FIG. 4 for convenience.

  The control means 16 determines whether or not to perform the intermediate cooling operation based on the temperature information of the heat source water W from the temperature sensor 53. Here, the temperature of the heat source water W, which is a criterion for determining whether to shift to the intermediate cooling operation, can be arbitrarily determined in advance. In particular, in the second embodiment, the amount of the heat source water W flowing in the heat source water system 11 is finely adjusted because the flow rate adjustment valve 52 is used instead of the open / close valve having only two states of the open state and the closed state. Therefore, it is possible to finely set the temperature that is the determination criterion.

  In the second embodiment, for example, the temperature of the heat source water W supplied to the water heat exchanger 33 is set in two stages of “25 ° C. or more and less than 35 ° C.” and “35 ° C. or more”. . When the temperature of the heat source water W supplied to the water heat exchanger 33 is “35 ° C. or higher”, the control means 16 controls the open / close valve 51 to be open and the flow rate adjustment valve 52 to be fully open. . By performing such control, the heat source water W sent to the fan coil unit 50 is passed through the fan coil 12 because the flow rate adjustment valve 52 is fully open (such heat source water). W is referred to as “heat source water W1” for the sake of convenience) and is not directed to the fan coil 12 by the on-off valve 51 that is also opened according to the pressure loss difference between the fan coil 12 and the water heat exchanger 33, and is directly passed to the water heat exchanger 33. Water is passed (such heat source water W is referred to as “heat source water W2” for convenience).

  The temperature of the heat source water W <b> 1 that has passed through the fan coil 12 decreases due to heat exchange in the fan coil 12. On the other hand, the heat source water W2 that has passed through the on-off valve 51 goes to the water heat exchanger 33 while maintaining its temperature. However, since the heat source water W1 and the heat source water W2 are mixed immediately before the water heat exchanger 33, the temperature of the heat source water W2 decreases. Accordingly, the heat source water W3 having a temperature lower than the temperature of the heat source water W2 supplied to the water heat source air conditioner 40 is supplied to the water heat exchanger 33. The heat source water W3 supplied to the water heat exchanger 33 is further subjected to heat exchange with the refrigerant of the heat pump unit 30 and discharged to the outside of the water heat source air conditioner 40.

  Further, when the control unit 16 determines that the temperature of the heat source water W supplied to the water heat exchanger 33 is “25 ° C. or more and less than 35 ° C.” based on information from the temperature sensor 53, the high temperature as described above. It is considered that no adverse effect is caused by supplying the heat source water W to the water heat exchanger 33. Therefore, with emphasis on the point that the cooling capacity of the water heat source air conditioner 40 is exhibited, the control means 16 adjusts the opening amount of the flow rate adjustment valve 52 based on information from the temperature sensor 53. Such control makes it possible to increase the cooling capacity to the maximum while avoiding the adverse effects that may occur during the cooling operation as described above.

  On the other hand, when heating operation is performed using the water source air conditioner 40 when the temperature of the heat source water W is low, the operation efficiency is reduced as described above, and the phenomenon such as freezing of the water heat exchanger and liquid back of the refrigerant is caused. It is also possible to cause Therefore, when the heating operation is performed in such a state, the control means 16 performs the control described below. In addition, when the water temperature of the heat source water W is low, the operation mode when performing the heating operation using the water source air conditioner 40 is represented as “intermediate heating operation” as shown in the table of FIG. 4 for convenience.

  The control means 16 determines whether to perform the intermediate heating operation based on the temperature information of the heat source water W from the temperature sensor 53. Here, the temperature of the heat source water W, which is a criterion for determining whether to shift to the intermediate heating operation, can be arbitrarily determined in advance. In particular, in the second embodiment, since the amount of the heat source water W flowing in the heat source water system 11 can be finely adjusted because the flow rate adjustment valve 52 is used, the temperature that becomes the determination reference is also set finely. It becomes possible.

  In the second embodiment, for example, the temperature of the heat source water W supplied to the water heat exchanger 33 is divided into two ranges of “15 ° C. to 25 ° C.” and “15 ° C. or less”. It is set. When the temperature of the heat source water W supplied to the water heat exchanger 33 is “15 ° C. or lower”, the control means 16 controls the open / close valve 51 to be opened and the flow rate adjustment valve 52 to be fully opened. . By performing such control, the heat source water W sent to the fan coil unit 50 is passed through the fan coil 12 because the flow rate adjustment valve 52 is fully open (such heat source water). W is referred to as “heat source water W1” for the sake of convenience) and is not directed to the fan coil 12 by the on-off valve 51 that is also opened according to the pressure loss difference between the fan coil 12 and the water heat exchanger 33, and is directly passed to the water heat exchanger 33. Water is passed (such heat source water W is referred to as “heat source water W2” for convenience).

  The temperature of the heat source water W <b> 1 that has passed through the fan coil 12 rises due to heat exchange in the fan coil 12. On the other hand, the heat source water W2 that has passed through the on-off valve 51 goes to the water heat exchanger 33 while maintaining its temperature. However, since the heat source water W1 and the heat source water W2 are mixed immediately before the water heat exchanger 33, the temperature of the heat source water W2 rises. Therefore, the heat source water W3 having a temperature higher than the temperature of the heat source water W2 supplied to the water heat source air conditioner 40 is supplied to the water heat exchanger 33. The heat source water W3 supplied to the water heat exchanger 33 is further subjected to heat exchange with the refrigerant of the heat pump unit 30 and discharged to the outside of the water heat source air conditioner 40.

  Further, when the control unit 16 determines that the temperature of the heat source water W supplied to the water heat exchanger 33 is within the range of “15 ° C. to 25 ° C.” based on the information from the temperature sensor 53, as described above. It is considered that no adverse effect is caused by supplying the low-temperature heat source water W to the water heat exchanger 33. Therefore, with emphasis on the point that the heating capacity of the water heat source air conditioner 40 is exhibited, the control means 16 adjusts the opening amount of the flow rate adjustment valve 52 based on information from the temperature sensor 53. By such control, it is possible to increase the heating capacity to the maximum while avoiding the adverse effects that may occur during the heating operation as described above.

  In the case of “air blowing operation”, the control means 16 controls the on-off valve 51 to be opened and the flow rate adjustment valve 52 to be fully closed. By controlling in this way, almost all of the heat source water W is supplied to the water heat exchanger 33. Therefore, the heat source water W is not supplied to the fan coil 12.

  By adopting the configuration and operation control method as described above, it is possible to adjust the temperature of the heat source water flowing into the water heat exchanger in the heat pump unit. Therefore, heat source water at a temperature that could not be used with fan coil units and heat pump units until now can be used, and the amount of heat source water to be discarded by expanding the usable temperature range. Therefore, it is possible to provide a water heat source air conditioner that contributes to energy saving. In particular, by using a flow control valve, it is possible to perform fine control based on information from the temperature sensor, so supply heat source water at the optimum temperature for the operation of the fan coil unit and heat pump unit to each unit. Can do. Therefore, it is possible to provide a water heat source air conditioner that can achieve a reduction in power consumption and an increase in operation capacity. Furthermore, since it is not necessary to attach a water-saving valve externally at the time of air blowing operation, a water heat source air conditioner having a simple configuration can be provided.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

It is a mimetic diagram showing the whole water heat source air harmony machine composition in a 1st embodiment of the present invention. The table | surface which shows the relationship between the operation mode performed in the water-source air conditioner in the 1st Embodiment of this invention, and the valve operation of the 1st on-off valve when each operation mode is performed. It is. It is a schematic diagram which shows the whole structure of the water-heat-source air conditioner in the 2nd Embodiment of this invention. The table | surface which shows the relationship between the operation mode performed in the water-source air conditioner in the 2nd Embodiment of this invention, and the valve operation of the 1st on-off valve when each operation mode is performed. It is.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Water heat source air conditioner, 10 ... Fan coil unit, 11 ... Heat source water system, 12 ... Fan coil, 13 ... 1st on-off valve, 14 ... 2nd on-off valve, 15 ... Temperature sensor, 16 ... Control means , 20 ... Fan, 30 ... Heat pump unit, 31 ... Compressor, 32 ... Four-way valve, 33 ... Water heat exchanger, 34 ... Expansion valve, S ... Heat pump refrigeration cycle, W ... Heat source water

Claims (10)

A heat pump unit in which a compressor, a four-way valve, a water heat exchanger for exchanging heat between the heat source water and the refrigerant, an expansion valve, and a refrigerant heat exchanger for air conditioning are sequentially connected by piping;
A fan coil unit that is housed in the same housing as the heat pump unit, and includes a heat source water system through which the heat source water passes and a fan coil through which the heat source water supplied through the heat source water system passes;
A first on-off valve provided between the inlet of the heat source water and the inlet of the water heat exchanger;
A second on-off valve provided at a position that bypasses the inlet of the heat source water and the outlet of the fan coil;
A temperature sensor provided between the heat source water inlet and the first on-off valve;
Control means for controlling the first on-off valve and the second on-off valve based on information from the temperature sensor;
A water heat source air conditioner comprising:   When the heat pump refrigeration cycle performs cooling operation, and the temperature of the heat source water, which is information from the temperature sensor, is equal to or higher than a predetermined temperature, the control means opens the first on-off valve, The water heat source air conditioner according to claim 1, wherein the second on-off valve is controlled to be closed.   When the heat pump refrigeration cycle performs heating operation, and the temperature of the heat source water, which is information from the temperature sensor, is equal to or lower than a predetermined temperature, the control means opens the first on-off valve, The water heat source air conditioner according to claim 1, wherein the second on-off valve is controlled to be closed.   When the heat pump refrigeration cycle performs a blowing operation or when the heat source water is stopped, the control means performs control to open the first on-off valve and the second on-off valve. The water heat source air conditioner according to claim 1. A heat pump unit in which a compressor, a four-way valve, a water heat exchanger for exchanging heat between the heat source water and the refrigerant, an expansion valve, and a refrigerant heat exchanger for air conditioning are sequentially connected by piping;
A fan coil unit that is housed in the same housing as the heat pump unit, and includes a heat source water system through which the heat source water passes and a fan coil through which the heat source water supplied through the heat source water system passes;
An on-off valve provided between the inlet of the heat source water and the inlet of the water heat exchanger;
A flow rate adjusting valve provided between the inlet of the heat source water and the inlet of the fan coil;
A temperature sensor provided immediately before the water heat exchanger at the position where the heat source water that has passed through the on-off valve and the heat source water that has passed through the fan coil are mixed;
Control means for controlling the on-off valve and the flow rate adjustment valve based on information from the temperature sensor;
A water heat source air conditioner comprising:   When the heat pump refrigeration cycle performs a cooling operation and the temperature of the mixed heat source water, which is information from the temperature sensor, is within a predetermined range, the control means opens the on-off valve, and the flow rate The water heat source air conditioner according to claim 5, wherein the adjustment valve is controlled to have an opening degree corresponding to the temperature of the mixed heat source water.   When the heat pump refrigeration cycle performs a cooling operation, and the temperature of the mixed heat source water, which is information from the temperature sensor, exceeds the upper limit of a predetermined range, the control means opens the on-off valve, The water heat source air conditioner according to claim 5, wherein control is performed to fully open the flow rate adjustment valve.   When the heat pump refrigeration cycle performs heating operation and the temperature of the mixed heat source water, which is information from the temperature sensor, is within a predetermined range, the control means opens the on-off valve, and the flow rate The water heat source air conditioner according to claim 5, wherein the adjustment valve is controlled to have an opening degree corresponding to the temperature of the mixed heat source water.   When the heat pump refrigeration cycle performs heating operation, and the temperature of the mixed heat source water, which is information from the temperature sensor, falls below a lower limit of a predetermined range, the control means opens the on-off valve, The water heat source air conditioner according to claim 5, wherein control is performed to fully open the flow rate adjustment valve.   When the heat pump refrigeration cycle performs a blowing operation or when the supply of heat source water is stopped, the control means performs control to fully open the on-off valve and fully close the flow rate adjustment valve. The water heat source air conditioner according to claim 5, wherein

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