JP2008286476A - Engine-driven heat pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively improve heating capacity in heat pump heating. <P>SOLUTION: This engine-driven heat pump device performing a heat transporting fluid heating operation by an operation control device 58 for heating a heat transporting fluid by cooling water, and utilizing exhaust heat in hot water supply, heating and the like, is further provided with an auxiliary heat source machine 32 capable of heating the heat transporting fluid supplied to a heat utilizing portion 56 by a heat transporting fluid supplying means 57 or a hot water storage tank 27 storing the heat transporting fluid after passing through an exhaust-heat heat exchanger 14, the heat transporting fluid supplying means 27 is constituted to supply the heat transporting fluid heated by the auxiliary heat source machine 32 or the heat transporting fluid stored in the hot water storage tank 27 to the exhaust-heat heat exchanger 14, and the operation control device 58 is constituted to perform a cooling water heating operation controlling the operations of a cooling water circulating means 15 and the heat transporting fluid supplying means 57 to heat the cooling water circulated by the cooling water circulating means 15 by the heat transporting fluid supplied to the heat transporting fluid supplying means 57 in the exhaust-heat heat exchanger 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a compressor that is driven by an engine to compress refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and a refrigerant circuit that circulates the refrigerant in the order of an evaporator that absorbs heat from the refrigerant; Cooling water circulation means for circulating the cooling water of the engine to and from the exhaust heat exchanger, heat supply fluid is supplied to the exhaust heat exchanger, and the heat transfer fluid after passing through the exhaust heat exchanger A heat transfer fluid supply means for supplying heat to the heat utilization section; and a heat transfer fluid supplied by the heat transfer fluid supply means with the cooling water circulated by the cooling water circulation means in the exhaust heat exchanger. Therefore, the present invention relates to an engine-driven heat pump apparatus provided with operation control means for performing a heat carrier fluid heating operation for controlling the respective operations of the cooling water circulation means and the heat carrier fluid supply means.

The engine-driven heat pump apparatus as described above is provided with an indoor unit capable of exchanging heat between the refrigerant and the indoor air as a condenser and an outdoor heat capable of exchanging heat between the refrigerant and the outdoor air as an evaporator. An exchanger is provided, and the operation control means drives the compressor by the engine, circulates the refrigerant in the refrigerant circuit, and performs the heat pump heating operation for heating the room.
When the operation control means performs the heat carrier fluid heating operation, the cooling water circulated by the coolant circulation means in the exhaust heat exchanger heats the heat carrier fluid supplied by the heat carrier fluid supply means, The heat carrier fluid is heated using engine cooling water. The heated heat carrier fluid is supplied to the heat utilization unit by the heat carrier fluid supply means and used for hot water supply, bathing, heating, and the like.

  In a conventional engine-driven heat pump device, a hot water storage tank for storing the heat transfer fluid after passing through the exhaust heat exchanger is provided, and the heat transfer fluid supply means uses the hot water stored in the hot water storage tank as a heat utilization unit. It is configured to supply. An auxiliary heat source device capable of heating the heat transfer fluid supplied to the heat use portion by the heat transfer fluid supply means is provided for the case where the heat load requested by the heat use portion cannot be covered. . Further, a refrigerant heating heat exchanger that heats the refrigerant in the refrigerant circuit with engine cooling water is provided so that the cooling water can be used for heating the refrigerant in addition to the heat of the atmosphere (for example, Patent Document 1). reference.).

Japanese Patent No. 3746471

In the above conventional engine-driven heat pump device, the heating capacity in the heat pump heating operation (hereinafter simply referred to as “heating capacity”) is improved by using engine cooling water for heating the refrigerant in addition to atmospheric heat. However, the refrigerant cannot be effectively heated by the atmospheric heat and the cooling water, and there is a possibility that the heating capacity cannot be effectively improved.
For example, when the engine is started from a state where the temperature of the engine or the cooling water is low, the cooling water cannot be used for heating the refrigerant until the engine or the cooling water is warmed, and the time until the cooling water can be used for heating the refrigerant. Becomes longer. Also, when the outside air temperature is very low, it is not possible to heat the refrigerant with atmospheric heat, so the heating capacity that can be obtained even if cooling water is used to heat the refrigerant is insufficient. There are things to do. Moreover, the use of cooling water for heating the refrigerant causes the temperature of the cooling water to decrease too much, causing water vapor in the combustion gas of the engine to condense and dissolve in the engine oil, leading to deterioration of the engine oil. May occur.

  This invention is made paying attention to this point, and the objective is to provide the engine drive heat pump apparatus which can aim at the improvement of a heating capability effectively.

  In order to achieve this object, a first characteristic configuration of an engine-driven heat pump device according to the present invention includes a compressor that is driven by an engine to compress refrigerant, a condenser that dissipates heat from the refrigerant, and an expansion valve that expands the refrigerant. A refrigerant circuit that circulates the refrigerant in the order of an evaporator that absorbs heat to the refrigerant, a cooling water circulation means that circulates cooling water of the engine between the exhaust heat exchanger, and a heat transfer fluid that exchanges the exhaust heat A heat transfer fluid supply means for supplying the heat transfer fluid after passing through the exhaust heat exchanger to a heat utilization part, and cooling water circulated by the coolant circulation means in the exhaust heat exchanger Operation control means for performing a heat carrier fluid heating operation for controlling the respective operations of the cooling water circulation means and the heat carrier fluid supply means to heat the heat carrier fluid supplied by the heat carrier fluid supply means. In the engine-driven heat pump apparatus provided, the heat transfer after passing through the auxiliary heat source unit that can heat the heat transfer fluid supplied to the heat utilization unit by the heat transfer fluid supply unit, or the exhaust heat exchanger A hot water storage tank for storing fluid is provided, and the heat transfer fluid supply means supplies the heat transfer fluid heated by the auxiliary heat source device or the heat transfer fluid stored in the hot water storage tank to the exhaust heat exchanger. The operation control means is configured to heat the cooling water circulated in the cooling water circulation means with the heat carrier fluid supplied by the heat carrier fluid supply means in the exhaust heat exchanger. The cooling water heating operation for controlling the respective operations of the cooling water circulation means and the heat carrier fluid supply means is performed.

That is, since the operation control means can perform the cooling water heating operation to heat the engine cooling water with the heat transfer fluid in the exhaust heat exchanger, the engine is started from a state where the temperature of the engine or the cooling water is low. The engine and cooling water can be warmed up in a short time. Therefore, for example, when engine cooling water is used for heating the refrigerant, the time until the cooling water can be used for heating the refrigerant can be shortened as much as possible, and the rise of the heat pump heating can be accelerated.
Also, for example, when cooling water is used for heating the refrigerant, the operation control means performs the cooling water heating operation so that the heat added to the cooling water in the exhaust heat exchanger is used for heating the refrigerant. can do. Therefore, when the outside air temperature is very low and the operation temperature is very low, the operation control means can perform the cooling water heating operation, thereby increasing the heating capacity that can be obtained and suppressing the deficiency from the required heating capacity. Moreover, even if the cooling water is used for heating the refrigerant, the temperature of the cooling water can be maintained at a high temperature, so that occurrence of problems such as deterioration of engine oil can be suppressed.

  In this way, the operation control means performs the cooling water heating operation, so that the heat pump heating can be started even when the engine is started from a low temperature or when the outside air temperature is very low. It has become possible to provide an engine-driven heat pump device that can be accelerated or can be prevented from being deficient in the heating capacity that is required, and that can effectively improve the heating capacity.

  A second characteristic configuration of the engine-driven heat pump device according to the present invention is configured such that the cooling water circulation means circulates the cooling water in a state of passing through a heat exchanger for heating the refrigerant that heats the refrigerant in the refrigerant circuit, The refrigerant heating heat exchanger is disposed in the refrigerant circuit so as to heat the refrigerant between the evaporator and the compressor.

That is, since the refrigerant between the evaporator and the compressor becomes low temperature due to evaporation in the evaporator, the cooling water circulated by the cooling water circulation means in the refrigerant heating heat exchanger is low in temperature. The refrigerant will be heated. Therefore, since the refrigerant heated by the refrigerant heating heat exchanger can be returned to the compressor, the cooling capacity can be utilized for heating the refrigerant to improve the heating capacity.
Moreover, when the operation control means performs the cooling water heating operation, the cooling water heated by the exhaust heat exchanger is supplied to the refrigerant heating heat exchanger, and is added to the cooling water by the exhaust heat exchanger. The generated heat can be used for heating the refrigerant. Therefore, the refrigerant can be effectively heated by the heat applied to the cooling water in the exhaust heat exchanger, and the heating capacity can be effectively improved.

  According to a third characteristic configuration of the engine-driven heat pump device according to the present invention, the cooling water circulation means allows the cooling water to pass through the engine, the exhaust heat exchanger, and the refrigerant heating heat exchanger in this order. The point is that it is configured to circulate.

That is, the cooling water circulation means supplies the cooling water immediately after passing through the exhaust heat exchanger to the refrigerant heating heat exchanger. When the operation control means performs the cooling water heating operation, the cooling water immediately after being heated in the exhaust heat exchanger can be supplied to the refrigerant heating heat exchanger, and is supplied to the refrigerant heating heat exchanger. The temperature of the cooling water can be made as high as possible. Therefore, the refrigerant can be heated to a higher temperature with the cooling water in the refrigerant heating heat exchanger, and the heating capacity can be improved. Moreover, since the heat added to the cooling water in the exhaust heat exchanger can be used with priority over the heating of the refrigerant, the heating capacity can be further improved.
In addition, since the cooling water after passing through the refrigerant heating heat exchanger returns to the engine, even if the cooling water is heated to a high temperature in the exhaust heat exchanger, the temperature drops due to the passage through the refrigerant heating heat exchanger. The cooled water is returned to the engine. Therefore, it is possible to prevent excessively high-temperature cooling water from being returned to the engine while keeping the temperature of the cooling water supplied to the refrigerant heating heat exchanger as high as possible.

  According to a fourth characteristic configuration of the engine-driven heat pump device according to the present invention, the condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and the indoor air, and the evaporator includes the refrigerant and the outdoor air outside the room. In the heat pump heating operation for heating the room, the operation control means is configured to perform the cooling water heating operation when starting the engine. It is in the point.

  That is, since the operation control means performs the cooling water heating operation when starting the engine in the heat pump heating operation, for example, when starting the engine from a state where the temperature of the engine or cooling water is low, such as in winter, the cooling water heating is performed. You can drive. By using the cooling water for heating the refrigerant, the heat added to the cooling water in the exhaust heat exchanger can be used for the heating of the refrigerant until the heating of the refrigerant can be started after the engine is started This makes it possible to shorten the time of heat as much as possible, thereby speeding up the start of heat pump heating. Incidentally, when starting the engine, it includes not only the start of the engine but also a time that is shifted by several minutes from the start of the engine.

  According to a fifth characteristic configuration of the engine-driven heat pump device according to the present invention, the condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and the indoor air, and the evaporator is configured to be the refrigerant and the outdoor air outside the room. In the heat pump heating operation for heating the room, the operation control means is configured to perform the cooling water heating operation when the heating capacity is insufficient. It is in the point.

  That is, when the heating capacity to be obtained is less than the required heating capacity, the operation control means performs the cooling water heating operation. By using the cooling water for heating the refrigerant, the heat applied to the cooling water in the exhaust heat exchanger can be used for the heating of the refrigerant, and the resulting heating capacity can be enhanced. Thus, it can suppress that the heating capacity obtained is insufficient rather than the required heating capacity.

  According to a sixth characteristic configuration of the engine-driven heat pump device according to the present invention, the condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and indoor air, and the evaporator includes the refrigerant and outdoor outdoor air. In the heat pump heating operation in which the operation control means heats the room, the cooling water heating operation is performed when the outside air temperature is lower than a predetermined temperature. It is in the point comprised as follows.

  That is, when the outside air temperature is lower than the predetermined temperature, it is not possible to expect the refrigerant to be heated by atmospheric heat, and thus high heating capacity cannot be obtained. Therefore, in such a case, the operation control means performs the cooling water heating operation. By using the cooling water for heating the refrigerant, the heat applied to the cooling water in the exhaust heat exchanger can be used for the heating of the refrigerant, and the resulting heating capacity can be enhanced.

  A seventh characteristic configuration of the engine-driven heat pump device according to the present invention is provided with operation command means for commanding execution of the cooling water heating operation, and the condenser can exchange heat between the refrigerant and indoor air. In the heat pump heating operation in which the evaporator is configured by an indoor unit, the evaporator is configured by an outdoor heat exchanger capable of exchanging heat between the refrigerant and the outdoor air, and the operation control unit heats the room. The cooling water heating operation is performed when the operation command means instructs the execution of the cooling water heating operation.

  That is, in the heat pump heating operation, it can be instructed by the operation command means whether or not the operation control means performs the cooling water heating operation. Therefore, when the user commands the execution of the cooling water heating operation by the operation command means, the cooling water heating operation can be executed according to the user's request, and the user's request can be met.

  An eighth feature of the engine-driven heat pump device according to the present invention is that the refrigerant circuit includes an indoor unit that can exchange heat between the refrigerant and indoor air, and an outdoor unit that can exchange heat between the refrigerant and outdoor air. A heat exchanger, a heating state in which the indoor unit functions as the condenser and the outdoor heat exchanger functions as the evaporator, and a function in which the indoor unit functions as the evaporator and the outdoor heat exchanger is condensed. Switching means capable of switching a refrigerant flow state to a cooling state to function as a cooler, and the refrigerant heating heat exchanger is provided between the outdoor heat exchanger and the compressor in the refrigerant circuit. The operation control means is configured to selectively perform a heat pump heating operation for switching the switching means to the heating state and the heat pump cooling operation for switching the switching means to the cooling state. It lies in the fact that is.

That is, the operation control means not only performs the heat pump heating operation for switching the switching means to the heating state, but also performs the heat pump cooling operation for switching the switching means to the cooling state. Can also be done.
Since the refrigerant heating heat exchanger is disposed in the refrigerant circuit between the outdoor heat exchanger and the compressor, when the operation control means performs the heat pump heating operation, A low-temperature refrigerant is supplied to the refrigerant heating heat exchanger. Therefore, the refrigerant can be heated with the cooling water in the refrigerant heating heat exchanger, and the heating capacity can be improved. When the operation control means performs the heat pump cooling operation, the high-temperature refrigerant from the compressor is supplied to the refrigerant heating heat exchanger. Therefore, even if high-temperature cooling water is supplied to the refrigerant heating heat exchanger by the cooling water circulation means, the temperature difference between the cooling water and the refrigerant can be reduced, and the cooling water further increases the temperature of the refrigerant in the refrigerant heating heat exchanger. It is possible to prevent adverse effects such as heating.
From the above, when performing the heat pump heating operation, it is possible to accurately perform the heat pump cooling operation while improving the heating capacity.

An embodiment of an engine-driven heat pump device according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the engine-driven heat pump device is driven by the engine 1 to compress a refrigerant 2, a condenser 3 that radiates heat from the refrigerant, an expansion valve 4 that expands the refrigerant, and the refrigerant that absorbs heat. It comprises a refrigerant circuit 6 that circulates refrigerant in the order of the evaporator 5 and an exhaust heat utilization device 7 that uses cooling water of the engine 1. The compressor 2 is provided such that the driving force of the engine 1 is transmitted by the belt 1a and is rotationally driven.
1-3, the flow state of the fluid is indicated by thick lines and arrows. 1 to 3 show the same configuration with respect to other configurations except that the portion through which the fluid flows is different.

The refrigerant circuit 6 includes an indoor unit 8 capable of exchanging heat between the refrigerant and indoor air, an outdoor heat exchanger 9 capable of exchanging heat between the refrigerant and outdoor air, and a condenser for the indoor unit 8. 3 and the cooling state in which the outdoor heat exchanger 9 functions as an evaporator and the cooling state in which the indoor unit 8 functions as an evaporator and the outdoor heat exchanger 9 functions as a condenser. A switchable four-way valve (corresponding to switching means) 10 is provided.
In the refrigerant circuit 6, the four-way valve 10 switches between a heating state and a connection state in a flow path between the compressor 2 and the indoor unit 8 and a flow path between the outdoor heat exchanger 9 and the compressor 2. It is configured to be switchable to a cooling state.

In the refrigerant circuit 6, an accumulator 11 is provided between the four-way valve 10 and the compressor 2 in a flow path on the side where the refrigerant is returned to the compressor 2. The outdoor heat exchanger 9 is configured to exchange heat between the refrigerant and the outdoor air by the operation of the outdoor fan 12.
The engine 1, the compressor 2, the four-way valve 10, the expansion valve 4, the outdoor heat exchanger 9, and the accumulator 11 are provided in the outdoor unit 13.

Cooling water circulating means 15 for circulating the cooling water of the engine 1 between the exhaust heat heat exchanger 14 provided in the exhaust heat utilization device 7 is provided. The cooling water circulation means 15 passes the cooling water in a state in which the cooling water is passed in the order of the engine 1, the exhaust heat exchanger 14, and the refrigerant heating heat exchanger 16 that heats the refrigerant in the refrigerant circuit 6 using the cooling water of the engine 1. It is configured to circulate. The refrigerant heating heat exchanger 16 is provided between the outdoor heat exchanger 9 and the four-way valve 10 in the refrigerant circuit 6.
The cooling water circulation means 15 includes a cooling water circulation path 17 and a cooling water circulation pump 18 provided in the cooling water circulation path 17. The cooling water circulation path 17 is provided with an exhaust gas heat exchanger 19 that collects heat of the combustion exhaust gas of the engine 1 by heat exchange with the combustion exhaust gas of the engine 1 in addition to recovering exhaust heat of the engine 1 body. ing. Although not shown, a plurality of cooling water temperature detection sensors are provided in the cooling water circulation path 17, and the temperature of the cooling water returned to the engine 1 and the exhaust heat heat by the plurality of cooling water temperature detection sensors. The temperature of the cooling water after passing through the exchanger 14 is detected.

In the cooling water circulation path 17, it branches from between the exhaust heat exchanger 14 and the refrigerant heating heat exchanger 16 and joins downstream of the refrigerant heating heat exchanger 16 to connect the refrigerant heating heat exchanger 16. A coolant bypass path 20 is provided for bypassing. A first three-way valve 21 is provided at a branch point of the cooling water bypass path 20 in the cooling water circulation path 17.
In the cooling water circulation path 17, there is provided a cooling water branch path 22 that branches from the downstream side of the refrigerant heating heat exchanger 16 and joins the upstream side of the meeting place of the cooling water bypass path 20. The cooling water branch path 22 is provided with a radiator 23 that radiates the heat of the cooling water to the outdoor air by the operation of the outdoor fan 12, and a buffer 25 to which a reserve tank 24 is connected. A second three-way valve 26 is provided at a branch point of the cooling water branch path 22 in the cooling water circulation path 17.

The exhaust heat utilization device 7 includes heat transport fluid supply means 57 that supplies the heat transport fluid to the exhaust heat exchanger 14 and supplies the heat transport fluid after passing through the exhaust heat exchanger 14 to the heat utilization unit 56. Is provided. The heat transfer fluid supply means 57 includes a hot water storage tank 27, a hot water circulation path 28 that circulates the hot water extracted from the hot water storage tank 27, and a hot water circulation pump 31.
The hot water storage tank 27 is configured to store hot water as a heat transfer fluid after passing through the exhaust heat exchanger 14. The heat utilization unit 56 includes a hot water supply location where hot water is used for hot water supply from the hot water supply passage 49, a bathtub 43 used for hot water filling, a bath heat exchanger 34 used for bathing, and a heating terminal 44. It is comprised from the heating heat exchanger 36 utilized for the heating in.
Further, an auxiliary heat source device 32 capable of heating the hot water supplied to the heat utilization unit 56 by the heat carrier fluid supply means 57 is provided. For example, the auxiliary heat source unit 32 includes a gas burner that burns by supplying a fuel gas such as city gas, and is configured by a gas combustion type hot water heater that burns the gas burner and heats the stored hot water.

The hot water circulation path 28 is connected to the lower part of the hot water tank 27 by a hot water extraction path 29 in order to take hot water from the hot water tank 27. The stored hot water circulation path 28 is connected to the upper part of the hot water storage tank 27 by a stored hot water return path 30 in order to return the stored hot water to the hot water storage tank 27. In this way, the hot water heated by the exhaust heat exchanger 14 is supplied to the upper part of the hot water storage tank 27 so that the hot hot water is stored in the upper part and the low temperature hot water is stored in the lower part. Hot water is stored in the hot water storage tank 27 in a state where it is formed.
In the hot water circulation path 28, an auxiliary heat source machine 32 and an auxiliary heat source machine 32 that can heat the hot water flowing through the hot water circulation pump 31, the exhaust heat exchanger 14, and the hot water circulation path 28 in the circulation direction of the hot water are provided. A first stored hot water adjustment valve 33 is provided that can adjust the amount of stored stored hot water.

In the stored hot water circulation path 28, the downstream side in the circulating direction of the stored hot water from the connection location of the stored hot water return path 30 is configured by two parallel flow paths. One flow path is provided with a bath heat exchanger 34 and a second hot water storage adjustment valve 35 that adjusts whether or not the hot water is allowed to flow to the bath heat exchanger 34. A third hot water storage adjustment valve 37 for adjusting whether or not the hot water is allowed to flow to the heat exchanger 36 and the heating heat exchanger 36 is provided.
The bath heat exchanger 34 is configured to heat the bath water in the bathtub 43 circulated in the bath circulation path 39 by the operation of the bath pump 38 with the hot water stored in the hot water circulation path 28. The heating heat exchanger 36 is configured to heat the heating water circulated in the heating circuit 41 by the operation of the heating pump 40 with the hot water stored in the hot water circulation circuit 28. Heating water heated by the heating heat exchanger 36 is supplied to a heating terminal 44 such as a floor heating panel and used for heating. An expansion tank 42 is provided in the heating circulation path 41.

A water supply passage 45 for supplying water to the hot water storage tank 27 is connected to the hot water storage passage 29. The water supply passage 45 is provided with a pressure reducing valve 46 and a first check valve 47.
The hot water return passage 30 is provided with a fourth hot water adjustment valve 48 for adjusting the flow rate of the hot water, and a hot water supply passage 49 for supplying hot water downstream of the fourth hot water adjustment valve 48. Is branched. A branch water supply path 50 branched from the water supply path 45 is connected to the hot water supply path 49 so that hot water is supplied in a state where hot water stored in the hot water return path 30 and water from the branch water supply path 50 are mixed. It is configured. The hot water supply passage 49 is provided with a mixing valve 51 at a connection point with the branch water supply passage 50 so that the mixing ratio of the hot water from the hot water return passage 30 and the water from the branch water supply passage 50 can be adjusted. Yes. The branch water supply path 50 is provided with a second check valve 52.
A hot water supply path 53 branched from the hot water supply path 49 and connected to the bath circulation path 39 is provided. The hot water supplied from the hot water supply passage 49 is supplied to the bathtub 43 so that the hot water filling of the bathtub 43 can be performed. The hot water filling passage 53 is provided with a hot water filling valve 54 and a third check valve 55.

  An operation control device 58 is provided as an operation control means for controlling the operation of the engine-driven heat pump device. Although not shown, the operation control device 58 is, for example, an operation control device that controls the operation of the outdoor unit 13, an operation control device that controls the operation of the indoor unit 8, and an operation that controls the operation of the exhaust heat utilization device 7. It comprises a plurality of operation control devices such as a control device and an operation control device for controlling the operation of the heating terminal. And a some driving | operation control apparatus is comprised so that operation | movement of the whole engine drive heat pump apparatus may be controlled by communicating various information mutually.

The operation control device 58 selectively performs a heat pump heating operation in which the engine 1 is driven to switch the four-way valve 10 to the heating state and a heat pump cooling operation in which the engine 1 is driven to switch the four-way valve 10 to the cooling state. It is configured.
In addition to the heat pump heating operation and the heat pump cooling operation, the operation control device 58 is supplied by the heat transfer fluid supply means 57 with the cooling water circulated by the cooling water circulation means 15 in the exhaust heat exchanger 14. A heat transfer fluid heating operation for controlling the operation of the cooling water circulation means 15 and the heat transfer fluid supply means 57 to heat the hot water, and an auxiliary supplied by the heat transfer fluid supply means 57 in the exhaust heat exchanger 14 The operation of each of the auxiliary heat source device 32, the cooling water circulation means 15 and the heat transfer fluid supply means 57 is controlled to heat the cooling water circulated by the cooling water circulation means 15 with the hot water heated by the heat source equipment 32. The cooling water heating operation is alternatively performed.

The operation controller 58 is configured to perform a heat pump heating operation when a heat pump heating operation is commanded by an air conditioning remote controller (not shown), and to perform a heat pump cooling operation when a heat pump cooling operation is commanded by an air conditioning remote controller (not shown). Yes.
The operation control device 58 is configured to perform the heat transfer fluid heating operation when the heat use requirement is satisfied when the heat pump heating operation or the heat pump cooling operation is performed. For example, the operation control device 58 has any one of a hot water storage request required when the amount of hot water stored in the hot water storage tank 27 is not full, a renewal request for reheating a bath, and a heating request for heating at the heating terminal 44. When it is satisfied, it is determined that the heat utilization requirement is satisfied.

The operation control device 58 is configured to perform a cooling water heating operation when starting the engine 1 in the heat pump heating operation. The operation control device 58 does not always perform the cooling water heating operation when starting the engine 1, but when the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water first predetermined temperature (for example, 20 ° C.), Alternatively, the cooling water heating operation is performed when the outside air temperature is equal to or lower than the first outside predetermined temperature (for example, 10 ° C.).
Further, the operation control device 58 is not only for starting the engine 1 in the heat pump heating operation but also for cooling water when the heating capacity is insufficient and when the outside air temperature is lower than the second outside predetermined temperature (for example, 2 ° C.). It is comprised so that a heating operation may be performed. The time when the heating capacity is insufficient is when the heating capacity obtained by performing the heat pump heating operation is shorter than the required heating capacity. For example, when the outside air temperature is very low (for example, 2 ° C.) or when it is extremely cold, or when the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water second predetermined temperature (for example, 55 ° C.).

In this way, in the heat pump heating operation, the operation control device 58 is configured such that the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water first predetermined temperature (for example, 20 ° C.) or the outside air temperature is the first outside predetermined temperature ( For example, when the engine 1 is started when the temperature is equal to or lower than 10 ° C., when the heating capacity is insufficient, and when the outside air temperature is lower than the second outside predetermined temperature (for example, 2 ° C.), the cooling water heating operation is performed. Configured to do.
During the execution of the cooling water heating operation, for example, the operation control device 58 reaches the set time for the operation time of the cooling water heating operation, or the temperature of the cooling water in the cooling water circulation path 17 is the third predetermined temperature of the cooling water (for example, 70 ° C.) or higher, the cooling water heating operation is stopped.

Based on FIG. 1, the state in which the operation control device 58 is simultaneously performing the heat pump cooling operation and the heat carrier fluid heating operation will be described.
In the heat pump cooling operation, the operation control device 58 drives the engine 1 to switch the four-way valve 10 to the cooling state, so that the refrigerant discharged from the compressor 2 is the refrigerant heating heat exchanger 16 and the outdoor heat exchanger 9. The refrigerant is circulated in the refrigerant circuit 6 so as to pass through the expansion valve 4, the indoor unit 8, and the accumulator 11 in this order and return to the compressor 2.
In the heat transfer fluid heating operation, the operation control device 58 operates the cooling water circulation pump 18 and controls the switching state of the first three-way valve 21 and the second three-way valve 26, thereby operating the cooling water circulation means 15. Control. Thus, the cooling water from the engine 1 is circulated in the cooling water circulation path 17 so as to pass through the exhaust heat exchanger 14, the refrigerant heating heat exchanger 16, and the exhaust gas heat exchanger 19 in this order and return to the engine 1. The Further, the operation control device 58 operates the hot water circulating pump 31 and controls the open / closed states of the first to fourth hot water storage regulating valves 33, 35, 37, 48, thereby Control operation. FIG. 1 shows a state in which the operation control device 58 controls the operation of the heat transfer fluid supply means 57 to store hot water in the hot water storage tank 27.

The refrigerant of the refrigerant circuit 6 will be described.
The refrigerant heating heat exchanger 16 is supplied with the high-temperature refrigerant from the compressor 2 and is supplied with high-temperature cooling water recovered from the exhaust heat of the engine 1 through the cooling water circulation path 17. In the heat exchanger 16 for heating the refrigerant, the temperature difference between the refrigerant and the cooling water can be reduced, and heat exchange between the refrigerant and the cooling water is not actively performed. Therefore, the temperature of the refrigerant changes almost. Without passing through the heat exchanger 16 for heating the refrigerant. The refrigerant that has passed through the refrigerant heating heat exchanger 16 is supplied to the outdoor heat exchanger 9, condensed, and radiated to the outside air blown by the outdoor fan 12. The refrigerant that has passed through the outdoor heat exchanger 9 is expanded by the expansion valve 4 and supplied to the indoor unit 8. In the indoor unit 8, the refrigerant absorbs heat by evaporating and cools the room.

The cooling water of the cooling water circulation path 17 will be described.
The exhaust heat exchanger 14 is supplied with high-temperature cooling water from which the exhaust heat of the engine 1 is recovered, and hot water taken out from the lower portion of the hot water storage tank 27 through the hot water circulation circuit 28. The hot water storage tank 27 stores hot water in a state in which high temperature hot water is stored in the upper part and low temperature hot water is stored in the lower part to form a temperature stratification, and the amount of hot water stored in the hot water storage tank 27 is not full. The hot water taken out from the water becomes cold. Therefore, in the waste heat exchanger 14, the cooling water heats the hot water. As described above, in the heat exchanger 16 for heating the refrigerant, heat exchange between the high-temperature refrigerant and the high-temperature cooling water is not actively performed. It passes through the heat exchanger 16 and is supplied to the exhaust gas heat exchanger 19.
When the temperature of the cooling water after passing through the refrigerant heating heat exchanger 16 is equal to or higher than the cooling water fourth predetermined temperature (for example, 82 ° C.), the operation control device 58 controls the switching state of the second three-way valve 26. By doing so, the cooling water that has passed through the refrigerant heating heat exchanger 16 is caused to flow through the cooling water branch path 22 and supplied to the radiator 23 as indicated by a dotted arrow in the figure. The cooling water supplied to the radiator 23 dissipates heat to the outside air blown by the outdoor fan 12 and decreases its temperature, and then passes through the buffer 25 and is supplied to the exhaust gas heat exchanger 19. In this way, excessively high-temperature cooling water is prevented from being returned to the engine 1.
Incidentally, when the temperature of the cooling water after passing through the refrigerant heating heat exchanger 16 becomes equal to or higher than the fourth predetermined temperature of the cooling water (for example, 82 ° C.), for example, the amount of hot water stored in the hot water storage tank 27 becomes full. This is a case in which it is no longer necessary for the cooling water in the exhaust heat exchanger 14 to heat the hot water by completing the hot water storage in the tank 27.

The hot water stored in the hot water circulating circuit 28 will be described.
In the exhaust heat heat exchanger 14, the cooling water heats the stored hot water, so the stored hot water heated in the exhaust heat exchanger 14 passes through the auxiliary heat source device 32 and is supplied to the upper part of the hot water storage tank 27. . At this time, the auxiliary heat source machine 32 has stopped operating and does not heat the hot water stored therethrough. A state in which hot water stored in the hot water storage tank 27 is supplied to the upper part of the hot water storage tank 27 to store hot hot water in the upper part and low temperature hot water in the lower part to form temperature stratification. The hot water is stored in the hot water storage tank 27.

The control of the open / closed state of the first to fourth stored hot water regulating valves 33, 35, 37, 48 will be described. The operation control device 58 opens the second stored hot water adjustment valve 35 and closes the third stored hot water adjustment valve 37 to pass the stored hot water through the bath heat exchanger 34 and the second stored hot water adjustment valve 35. The hot water is circulated in the hot water circulation path 28 in the form. Then, the operation control device 58 adjusts the opening degree of the first hot water storage adjustment valve 33, thereby adjusting the entire circulating flow rate in the hot water storage circuit 28 and adjusting the opening degree of the fourth hot water adjustment valve 48. As a result, the mixing ratio between the hot water passing through the second hot water control valve 35 and the hot water taken out from the hot water take-out passage 29 is adjusted. The operation controller 58 adjusts the temperature of the hot water supplied to the exhaust heat exchanger 14 by adjusting the mixing ratio, so that the temperature of the hot water that has passed through the exhaust heat exchanger 14 becomes a predetermined hot water storage temperature. I am doing so. In this way, the hot water stored at a predetermined temperature that has passed through the exhaust heat exchanger 14 is passed through the auxiliary heat source device 32 and the first hot water adjustment valve 33, and a part thereof is stored in the hot water return path 30. The hot water tank 27 is supplied to the upper part.
When the temperature of the hot water stored in the lower part of the hot water storage tank 27 becomes equal to or higher than the predetermined temperature, the operation control device 58 determines that the hot water storage capacity of the hot water storage tank 27 is full and stops the hot water circulation pump 31 to adjust the fourth hot water storage temperature. The valve 48 is closed and the hot water storage in the hot water storage tank 27 is ended.

Based on FIG. 2, a state in which the operation control device 58 is simultaneously performing the heat pump heating operation and the heat transfer fluid heating operation will be described.
In the heat pump heating operation, the operation control device 58 drives the engine 1 to switch the four-way valve 10 to the heating state, so that the refrigerant discharged from the compressor 2 is the indoor unit 8, the expansion valve 4, and the outdoor heat exchanger 9. Then, the refrigerant is circulated in the refrigerant circuit 6 so as to pass through the refrigerant heating heat exchanger 16 and the accumulator 11 in this order and return to the compressor 2.
As for the heat transfer fluid heating operation, as in FIG. 1, the operation control device 58 operates the cooling water circulation pump 18 and controls the switching state of the first three-way valve 21 and the second three-way valve 26. The operation of the cooling water circulation means 15 is controlled. Thus, the cooling water from the engine 1 is circulated in the cooling water circulation path 17 so as to pass through the exhaust heat exchanger 14, the refrigerant heating heat exchanger 16, and the exhaust gas heat exchanger 19 in this order and return to the engine 1. The In addition, the operation control device 58 operates the hot water circulating pump 31 and controls the open / close states of the first to fourth hot water regulating valves 33, 35, 37, and 48 as in FIG. The operation of the carrier fluid supply means 57 is controlled. 2 also shows a state in which the operation control device 58 stores hot water in the hot water storage tank 27 by controlling the operation of the heat transfer fluid supply means 57 as in FIG.

The refrigerant of the refrigerant circuit 6 will be described.
Since the high-temperature refrigerant from the compressor 2 is supplied to the indoor unit 8, the refrigerant is dissipated to heat the room to heat the room. The refrigerant that has passed through the indoor unit 8 is expanded by the expansion valve 4 and supplied to the outdoor heat exchanger 9. The refrigerant supplied to the outdoor heat exchanger 9 absorbs heat from the outside air blown by the outdoor fan 12 and partly evaporates, and is supplied to the refrigerant heating heat exchanger 16. The coolant heating heat exchanger 16 is supplied with high-temperature cooling water in which the exhaust heat of the engine 1 is recovered by the cooling water circulation path 17. Therefore, in the heat exchanger 16 for heating the refrigerant, the cooling water heats the refrigerant, and the refrigerant is completely evaporated and further heated. Therefore, the heating capacity can be improved as compared with the heat pump using only the outside air. In this manner, the refrigerant heating heat exchanger 16 is arranged to heat the refrigerant between the evaporator 5 (outdoor heat exchanger 9) and the compressor 2 during the heat pump heating operation.

The cooling water of the cooling water circulation path 17 will be described.
In the exhaust heat exchanger 14, similarly to FIG. 1, the low-temperature hot water taken out from the lower portion of the hot water storage tank 27 is heated by the high-temperature cooling water from the engine 1. Since the refrigerant which has passed through the expansion valve 4 and has become low temperature and low pressure partially evaporates in the outdoor heat exchanger 9 to the refrigerant heating heat exchanger 16, the refrigerant in a gas-liquid mixed state is supplied with low temperature and low pressure. Cooling water heats the refrigerant.
When the temperature of the cooling water that has passed through the exhaust heat exchanger 14 becomes the cooling water fifth predetermined temperature (for example, 60 ° C.) or less, the operation control device 58 controls the switching state of the first three-way valve 21. As shown by the dotted arrows in the figure, a part or all of the cooling water that has passed through the exhaust heat exchanger 14 is passed through the cooling water bypass 20 and supplied to the exhaust gas heat exchanger 19. . Thus, when the temperature of the cooling water that has passed through the exhaust heat exchanger 14 is equal to or lower than the fifth predetermined temperature of the cooling water (for example, 60 ° C.), the cooling water is not supplied to the refrigerant heating heat exchanger 16 as much as possible. In this way, the cooling water is further cooled by the refrigerant, and the temperature of the cooling water is prevented from excessively decreasing.
The hot water stored in the hot water circulation circuit 28 is the same as that shown in FIG.

Based on FIG. 3, the state which the operation control apparatus 58 is performing the heat pump heating operation and the cooling water heating operation simultaneously is demonstrated.
In the heat pump heating operation, similarly to FIG. 2, the refrigerant discharged from the compressor 2 passes through the indoor unit 8, the expansion valve 4, the outdoor heat exchanger 9, the refrigerant heating heat exchanger 16, and the accumulator 11 in order. It is circulated in the refrigerant circuit 6 so as to return to the machine 2.
In the cooling water heating operation, the operation control device 58 operates the cooling water circulation pump 18 and controls the switching state of the first three-way valve 21 and the second three-way valve 26 to control the operation of the cooling water circulation means 15. . Thus, the cooling water from the engine 1 is circulated in the cooling water circulation path 17 so as to pass through the exhaust heat exchanger 14, the refrigerant heating heat exchanger 16, and the exhaust gas heat exchanger 19 in this order and return to the engine 1. The Further, the operation control device 58 heats the stored hot water with the auxiliary heat source unit 32 to operate the stored hot water circulation pump 31 and opens and closes the first to fourth stored hot water regulating valves 33, 35, 37, 48. To control the operation of the heat transfer fluid supply means 57. Thereby, the hot water stored in the auxiliary heat source device 32 is circulated in the hot water storage circuit 28 so as to pass through the exhaust heat exchanger 14 and return to the auxiliary heat source device 32.

The hot water stored in the hot water circulating circuit 28 will be described.
The operation control device 58 opens the second hot water adjustment valve 35 and closes the third hot water adjustment valve 37 and the fourth hot water adjustment valve 48 to bathe the hot water passing through the auxiliary heat source device 32. The heat exchanger 34 and the exhaust heat exchanger 14 are passed through in this order and returned to the auxiliary heat source unit 32 to be circulated in the hot water circulation circuit 28. Then, the operation control device 58 adjusts the amount of combustion of the auxiliary heat source unit 32 and adjusts the opening degree of the first hot water storage adjustment valve 33 to adjust the entire circulation flow rate in the hot water storage circuit 28, thereby exhaust heat heat. The temperature of the hot water supplied to the exchanger 14 is set to a desired temperature (for example, 70 to 80 ° C.), and the flow rate of the hot water supplied to the exhaust heat exchanger 14 is set to a desired flow rate.

The cooling water of the cooling water circulation path 17 will be described.
When the engine 1 is started when the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water first predetermined temperature (for example, 20 ° C.) or the outside air temperature is equal to or lower than the first outside predetermined temperature (for example, 10 ° C.), When the heating capacity is insufficient, the cooling water heating operation is performed each time when the outside air temperature is lower than the outside air second predetermined temperature (for example, 2 ° C.). Therefore, the temperature of the cooling water supplied to the exhaust heat exchanger 14 is relatively low at any time. On the other hand, the waste heat exchanger 14 is supplied with hot water stored at a desired temperature (for example, 70 to 80 ° C.) heated by the auxiliary heat source device 32. Therefore, in the exhaust heat exchanger, the hot water is higher in temperature than the cooling water, and the hot water heats the cooling water.

  The cooling water heated by the exhaust heat exchanger 14 is supplied to the refrigerant heating heat exchanger 16 to heat the low-temperature refrigerant. Since the cooling water immediately after being heated by the exhaust heat exchanger 14 is supplied to the refrigerant heating heat exchanger 16, the heat added to the cooling water by the exhaust heat exchanger 14 is heated by the refrigerant. The heat exchanger 16 can be preferentially used for heating the refrigerant, and the heating capacity can be effectively improved. And since the cooling water after passing the refrigerant | coolant heating heat exchanger 16 is still maintaining high temperature, the exhaust gas heat exchanger 19 and the engine 1 can be warmed with the high temperature cooling water. In this way, the heat applied to the cooling water in the exhaust heat exchanger 14 can be used for heating the refrigerant, heating the exhaust gas heat exchanger 19, and heating the engine 1.

When the engine 1 is started when the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water first predetermined temperature (for example, 20 ° C.) or the outside air temperature is equal to or lower than the first outdoor temperature (for example, 10 ° C.), Since the heat added to the cooling water in the exhaust heat exchanger 14 can be used preferentially for the heating of the refrigerant, the start-up of the heat pump heating can be accelerated.
Even when the heating capacity is insufficient and when the outside air temperature is lower than the outside second predetermined temperature (for example, 2 ° C.), the heat added to the cooling water in the exhaust heat exchanger 14 is preferential to the heating of the refrigerant. Therefore, the obtained heating capacity can be increased, and the obtained heating capacity can be suppressed from being deficient as compared with the required heating capacity. In addition, by heating the cooling water in the exhaust heat exchanger 14, even if the cooling water is used for heating the refrigerant in the refrigerant heating heat exchanger 16, it is possible to prevent the temperature of the cooling water from being excessively lowered.
The refrigerant in the refrigerant circuit 6 is the same as that in FIG.

  In addition to the above-described operations, the operation control device 58 includes a hot water supply operation for supplying hot water from the hot water supply passage 49, a hot water operation for performing hot water filling of the bathtub 43, a reheating operation for heating the bathtub water of the bathtub 43, and a heating terminal 44. It is configured to control the operation of the exhaust heat utilization device 7 so as to perform each of the hot water heating operations for performing the heating.

In the hot water supply operation, the operation control device 58 adjusts the opening degree of the mixing valve 51 to mix the hot water stored in the hot water storage tank 27 with the water from the branch water supply channel 50 to obtain the hot water supply temperature. At 49, hot water is supplied.
In the hot water filling operation, the operation control device 58 adjusts the opening degree of the mixing valve 51 and opens the hot water filling valve 54 so that the hot water stored in the hot water storage tank 27 is supplied with water from the branch water supply channel 50. Hot and cold water that has been mixed and set to a bath set temperature is supplied to the bathtub 43 through the hot water filling passage 53 and the bath circulation passage 39.
In the hot water supply operation and the hot water filling operation, the operation control device 58 controls the open / closed states of the first to fourth hot water storage regulating valves 33, 35, 37, and 48 and allows the hot water to pass through the auxiliary heat source device 32. The hot water is circulated in the hot water circulation circuit 28 and the auxiliary heat source device 32 is operated so that the hot water heated by the auxiliary heat source device 32 can be used for hot water supply or hot water filling. In this way, when the amount of heat obtained in the hot water supply operation or hot water filling operation is less than the required amount of heat, the amount of heat obtained is required by using the hot water stored in the auxiliary heat source unit 32. It can be suppressed that the amount of heat is insufficient. For example, in the hot water supply operation and the hot water filling operation, the hot water stored in the upper part of the hot water storage tank 27 is heated by the auxiliary heat source device 32 when the temperature of the hot water stored is lower than the predetermined temperature higher than the hot water supply set temperature. Hot water is used for hot water supply and hot water filling.

In the chasing operation, the operation control device 58 operates the hot water circulating pump 31 and controls the open / closed states of the first to fourth hot water regulating valves 33, 35, 37, 48, thereby bathing the hot water. The hot water is circulated in the hot water circulation circuit 28 in a form of passing through the heat exchanger 34 and the auxiliary heat source device 32 is operated so that the hot water heated by the auxiliary heat source device 32 is supplied to the bath heat exchanger 34. I have to. Further, the operation control device 58 circulates the bath water between the bathtub 43 and the bath heat exchanger 34 by the operation of the bath pump 40, so that the bath water heated by the bath heat exchanger 34 is supplied to the bathtub 43. I try to return it.
At this time, if the engine 1 is operating, it is possible to heat the stored hot water with cooling water in the exhaust heat exchanger 14. Therefore, the operation control device 58 performs the reheating operation in the heat transfer fluid heating operation, thereby using the hot water stored in the exhaust heat exchanger 14 for reheating the bath.

In the hot water heating operation, the operation control device 58 operates the hot water circulating pump 31 and controls the open / closed states of the first to fourth hot water adjustment valves 33, 35, 37, and 48, thereby heating the hot water. It is circulated in the hot water storage circuit 28 in such a form that it passes through the heat exchanger 36. Further, the operation control device 58 circulates the heating water between the heating terminal 44 and the heating heat exchanger 36 by the operation of the heating pump 40, whereby the heating water heated by the heating heat exchanger 36 is converted into the heating terminal. 44 is supplied. At this time, if the engine 1 is operating, it is possible to heat the stored hot water with the cooling water in the exhaust heat exchanger 14, so the operation control device 58 performs the hot water heating operation in the heat transfer fluid heating operation. The hot water stored in the exhaust heat exchanger 14 is used for hot water heating.
In the hot water heating operation, when the amount of heat obtained only by heating the stored hot water in the exhaust heat exchanger 14 is less than the required amount of heat, the operation control device 58 causes the first to fourth hot water storages. The open / close state of the water regulating valves 33, 35, 37, and 48 is controlled to circulate hot water in the hot water circulating circuit 28 in a form that passes through the auxiliary heat source 32, and the auxiliary heat source 32 is operated to assist Hot water heated by the heat source device 32 is used for hot water heating.

  In FIG. 1, the state in which the operation control device 58 performs the heat pump cooling operation and the heat transfer fluid heating operation at the same time has been described. However, the operation control device 58 can perform the heat pump cooling operation alone. In FIG. 2, the state in which the operation control device 58 performs the heat pump heating operation and the heat transfer fluid heating operation at the same time has been described. However, the operation control device 58 can perform the heat pump heating operation alone.

[Another embodiment]
(1) In the above embodiment, in the cooling water heating operation, the heat carrier fluid supply means 57 supplies the hot water stored in the auxiliary heat source unit 32 to the exhaust heat exchanger 14. In the heating operation, the heat transfer fluid supply means 57 may supply the hot water stored in the hot water storage tank 27 to the exhaust heat exchanger 14. In this case, for example, the hot water storage means for taking out hot water from the upper part of the hot water storage tank 27 and supplying the hot water to the upstream side of the exhaust heat heat exchanger 14 in the hot water circulation path 28 and the exhaust heat exchanger 14 are provided. There is provided hot water return means for returning the hot water after passing to the lower part of the hot water storage tank 27.

(2) In the above embodiment, the auxiliary heat source device 32 is disposed downstream of the exhaust heat exchanger 14 in the hot water circulation circuit 28, but the auxiliary heat source device 32 is disposed in the hot water circulation channel 28. It can also be arranged upstream of 14. The position where the auxiliary heat source device 32 is arranged can be changed as appropriate.

(3) Although the cooling water circulation pump 18 is provided in the outdoor unit 13 in the above embodiment, the cooling water circulation pump 18 may be provided in the exhaust heat utilization device 7.

(4) In the above embodiment, the gas combustion type hot water heater is exemplified as the auxiliary heat source device 32. However, an electric water heater provided with an electric heater can be applied, and other various auxiliary heat source devices are also applied. be able to.

(5) In the above embodiment, the refrigerant circuit 6 is provided with the four-way valve 10 as switching means, and not only the heat pump heating operation for heating the room but also the heat pump cooling operation for cooling the room is performed. Only the heat pump heating operation for heating may be performed.

(6) In the above embodiment, the cooling water circulation means 15 circulates the cooling water of the engine 1 between the exhaust heat exchanger 14 and is provided in parallel with the exhaust heat exchanger 14. The cooling water of the engine 1 can also be circulated with the direct heating heat exchanger that heats the heating water circulated by the operation. In this case, the cooling water circulating means 15 circulates the cooling water of the engine 1 directly with the heating heat exchanger, thereby heating the heating water with the cooling water in the direct heating heat exchanger and heating the cooling water. The heated water is supplied to the heating terminal 44. Thus, since the heating water can be directly heated with the cooling water in the direct heating heat exchanger, the heating water having a desired temperature can be obtained while efficiently using the cooling water.

(7) In the embodiment described above, an operation command type operation command switch is provided as an operation command means for commanding execution of the cooling water heating operation, and the operation control device 58 is operated by the operation command switch in the heat pump heating operation. The cooling water heating operation may be performed when the execution of the heating operation is instructed. Thus, the operation control device 58 can execute the cooling water heating operation in accordance with the user's request, and can meet the user's request. In this case, for example, when the temperature of the cooling water in the cooling water circulation path 17 becomes equal to or higher than the third predetermined temperature of the cooling water (for example, 70 ° C.), the operation control device 58 causes the cooling water to become excessive. The heating operation can be stopped.

(8) In the above embodiment, when the operation control device 58 performs the heat pump heating operation, the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water first predetermined temperature (for example, 20 ° C.), or the outside air temperature is When the engine 1 is started when the outside air temperature is lower than the first predetermined temperature (for example, 10 ° C.), when the heating capacity is insufficient, and when the outside air temperature is lower than the second predetermined temperature (for example, 2 ° C.). The cooling water heating operation is configured to be performed, but when the cooling water heating operation is performed can be appropriately changed. For example, in the heat pump heating operation, when the operation control device 58 is in the heat pump heating operation, the temperature of the cooling water in the cooling water circulation path 17 is equal to or lower than the cooling water first predetermined temperature (for example, 20 ° C.) or the outside air temperature is the first predetermined temperature of the outside air (for example, 10 ° C. The cooling water heating operation can be performed only when the engine 1 is started in the following cases.

  The present invention is a compressor that is driven by an engine to compress refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and a refrigerant circuit that circulates the refrigerant in the order of an evaporator that absorbs heat from the refrigerant; Cooling water circulation means for circulating the cooling water of the engine to and from the exhaust heat exchanger, heat supply fluid is supplied to the exhaust heat exchanger, and the heat transfer fluid after passing through the exhaust heat exchanger A heat carrier fluid supply means for supplying heat to the heat utilization unit is provided, and can be applied to various engine-driven heat pump devices capable of exhibiting sufficient heating capacity.

Schematic of the engine-driven heat pump device in a state where the heat pump cooling operation and the heat transfer fluid heating operation are performed Schematic of the engine-driven heat pump device in a state where the heat pump heating operation and the heat transfer fluid heating operation are performed Schematic of the engine-driven heat pump device in a state where the heat pump heating operation and the cooling water heating operation are performed

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Compressor 3 Condenser 4 Expansion valve 5 Evaporator 6 Refrigerant circuit 8 Indoor unit 9 Outdoor heat exchanger 10 Switching means (four-way valve)
DESCRIPTION OF SYMBOLS 14 Waste heat exchanger 15 Cooling water circulation means 16 Refrigerant heating heat exchanger 27 Hot water storage tank 32 Auxiliary heat source machine 56 Heat utilization part 57 Heat conveyance fluid supply means 58 Operation control means (operation control apparatus)

Claims (8)

A compressor driven by the engine to compress the refrigerant, a condenser that dissipates heat from the refrigerant, an expansion valve that expands the refrigerant, and a refrigerant circuit that circulates the refrigerant in the order of the evaporator that absorbs heat from the refrigerant;
A cooling water circulating means for circulating the cooling water of the engine to and from the exhaust heat exchanger;
A heat transfer fluid supply means for supplying a heat transfer fluid to the exhaust heat exchanger, and supplying the heat transfer fluid after passing through the exhaust heat exchanger to a heat utilization unit;
The cooling water circulation means and the heat carrier fluid supply means for heating the heat carrier fluid supplied by the heat carrier fluid supply means with the cooling water circulated by the cooling water circulation means in the exhaust heat exchanger. An engine-driven heat pump device provided with an operation control means for performing a heat carrier fluid heating operation for controlling the operation of each of
An auxiliary heat source device capable of heating the heat transfer fluid supplied to the heat utilization unit by the heat transfer fluid supply means, or a hot water storage tank for storing the heat transfer fluid after passing through the exhaust heat exchanger,
The heat carrier fluid supply means is configured to supply the heat carrier fluid heated by the auxiliary heat source device or the heat carrier fluid stored in the hot water storage tank to the exhaust heat exchanger.
In order to heat the cooling water circulated in the cooling water circulation means with the heat carrier fluid supplied by the heat carrier fluid supply means in the exhaust heat exchanger, the operation control means, An engine-driven heat pump device configured to perform a cooling water heating operation for controlling each operation of the heat transfer fluid supply means. The cooling water circulation means is configured to circulate cooling water in a state of passing through a refrigerant heating heat exchanger that heats the refrigerant in the refrigerant circuit;
The engine-driven heat pump device according to claim 1, wherein the refrigerant heating heat exchanger is disposed in the refrigerant circuit so as to heat a refrigerant between the evaporator and the compressor.   The engine according to claim 2, wherein the cooling water circulation means is configured to circulate the cooling water in a state in which the cooling water is passed in the order of the engine, the exhaust heat exchanger, and the refrigerant heating heat exchanger. Drive heat pump device. The condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and indoor air,
The evaporator is composed of an outdoor heat exchanger capable of exchanging heat between the refrigerant and the outdoor air,
4. The engine-driven heat pump device according to claim 2, wherein the operation control unit is configured to perform the cooling water heating operation when starting the engine in a heat pump heating operation for heating the room. 5. The condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and indoor air,
The evaporator is composed of an outdoor heat exchanger capable of exchanging heat between the refrigerant and the outdoor air,
The engine according to any one of claims 2 to 4, wherein the operation control means is configured to perform the cooling water heating operation when a heating capacity is insufficient in a heat pump heating operation for heating the room. Drive heat pump device. The condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and indoor air,
The evaporator is composed of an outdoor heat exchanger capable of exchanging heat between the refrigerant and the outdoor air,
6. The heat pump heating operation for heating the room, wherein the operation control means is configured to perform the cooling water heating operation when an outside air temperature is lower than a predetermined temperature. The engine-driven heat pump device described. An operation command means for commanding execution of the cooling water heating operation is provided,
The condenser is configured by an indoor unit capable of exchanging heat between the refrigerant and indoor air,
The evaporator is composed of an outdoor heat exchanger capable of exchanging heat between the refrigerant and the outdoor air,
In the heat pump heating operation for heating the room, the operation control unit is configured to perform the cooling water heating operation when the operation command unit instructs the execution of the cooling water heating operation. Item 7. The engine-driven heat pump device according to any one of Items 2 to 6. The refrigerant circuit causes an indoor unit capable of exchanging heat between the refrigerant and indoor air, an outdoor heat exchanger capable of exchanging heat between the refrigerant and outdoor outdoor air, and the indoor unit to function as the condenser. The refrigerant flow state is switched between a heating state in which the outdoor heat exchanger functions as the evaporator and a cooling state in which the indoor unit functions as the evaporator and the outdoor heat exchanger functions as the condenser. Flexible switching means,
The refrigerant heating heat exchanger is disposed between the outdoor heat exchanger and the compressor in the refrigerant circuit,
The operation control means is configured to selectively perform a heat pump heating operation for switching the switching means to the heating state and a heat pump cooling operation for switching the switching means to the cooling state. The engine-driven heat pump device according to any one of the above.

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