JPH05240528A - Heat pump and air conditioner - Google Patents

Abstract

PURPOSE:To reduce the whole size by heat exchanging refrigerant of a lead pump system using a compressor having an engine as a drive source only with water of waste heat recovering warm water system of the engine in an evaporator. CONSTITUTION:Water heated by waste heat of an engine 1 by a heat exchanger 8 is arrived at a heat exchanger 5 through a waste heat recovering warm water system 7, heat exchanged with refrigerant of a heat pump system 6 in the exchanger 5 to heat refrigerant, thereby evaporating it. The evaporated refrigerator is arrived at a condenser 3 through a compressor 2 to dissipate heat to be used for room heating, etc. Water cooled in the exchanger 5 is circulated to the exchanger 8 and again used for recovering the waste heat of the engine 1. Thus, the entiresize can be reduced, and can be suitably installed on a veranda, etc., without restriction in a height of a building.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump device and a heating / cooling device.

[0002]

2. Description of the Related Art Conventional heat pump devices used for heating and cooling devices include those that drive a compressor by an electric motor and those that are driven by an engine, and those that use air as a heat source and water as a heat source. There is something.

[0003]

In the case of using air as the heat source, the evaporator is a heat exchanger for gas (air) and liquid (refrigerant), and therefore cooling fins and fans are required, and therefore the apparatus is large in size. Therefore, in the case of the engine-driven type, it is difficult to install it on the balcony of the building. Therefore, normally, this heat exchanger must be installed on the rooftop, and in that case, the height of the building is also limited due to the restriction of the height difference of the refrigerant pipes.

In the case of using water as a heat source, an auxiliary heat source such as a boiler is required for heating the evaporator. The present invention aims to solve such problems.

[0005]

In order to solve the above-mentioned problems, first, in the present invention, only a refrigerant of a heat pump system using a compressor having an engine as a drive source and cooling water of a cooling water system of the engine are used. We propose a heat pump device in which heat is exchanged in the evaporator.

In the present invention, a heat pump having a compressor driven by an engine, a first heat exchanger and a second heat exchanger operating as an evaporator or a condenser, a pressure reducing means, and a cooling / heating switching means are provided. A heating / cooling device is proposed which is provided with a system, an engine waste heat recovery hot water system that passes through the first heat exchanger, and a heat dissipation system that is detachably connected to the engine waste heat recovery hot water system by switching means.

[0007]

[Operation] The waste heat of the engine is recovered by the water flowing through the waste heat recovery hot water system, and the refrigerant in the heat pump system is heated by heat exchange between the liquid (cooling water) and the liquid (refrigerant) in the evaporator. In operation, it is available via a condenser.

Therefore, in the heating / cooling device using this heat pump device, sufficient heating can be performed via the heat exchanger as a condenser without requiring an auxiliary heat source even during heating in the severe cold season.

During cooling, the hot water heated by the waste heat of the engine radiates heat in the heat radiation system and then cools the refrigerant in the heat pump system in the condenser, and heat exchange as an evaporator by the heat pump operation. Air conditioning can be performed via the heater.

[0010]

The present invention will be described below with reference to the drawings. Figure 1
2 is a system diagram conceptually showing the configuration of the heat pump device of the present invention, where reference numeral 1 is an engine, and 2 is a compressor driven by the engine 1. A heat pump system 6 is composed of a refrigerant path from the compressor 2, a condenser 3, a pressure reducing valve 4 as a pressure reducing means, and a heat exchanger 5 as an evaporator. On the other hand, reference numeral 7 is a waste heat recovery hot water system of the engine 1, and the waste heat recovery hot water system 7 is constituted by a water path from the heat exchange section 8 through the pump 9 and the heat exchanger 5.

In the above construction, the water heated by the waste heat of the engine 1 in the heat exchange section 8 flows through the waste heat recovery hot water system 7 to the heat exchanger 5, where the heat pump system 6 It exchanges heat with the refrigerant to heat and evaporate the refrigerant.
The evaporated refrigerant passes through the compressor 2 and reaches the condenser 3 where it radiates heat and is used for heating and the like. Further, the water cooled in the heat exchanger 5 is returned to the heat exchange section 8 and is again used for waste heat recovery of the engine 1.

Next, FIG. 2 and FIG. 3 are system diagrams conceptually showing the structure of a direct expansion type heating / cooling device constructed by using the above heat pump device. Are given the same reference numerals. That is, in FIG.
The heating / cooling device shown in FIG. 3 includes a compressor 2 having an engine 1 as a drive source, an outdoor heat exchanger 10 and an indoor heat exchanger 11 which operate as an evaporator 5 or a condenser 3, and an expansion valve as a pressure reducing means. 4, a heat pump system 6 provided with a four-way valve 12 as a heating / cooling switching means, an engine waste heat recovery hot water system 7 including a water passage from the heat exchange section 8 of the engine 1 to the pump 9 and the outdoor heat exchanger 10. And the engine waste heat recovery hot water system 7 upstream of the outdoor heat exchanger 10 is provided with a heat radiation system 14 which is detachably connected by a three-way valve 13 as a switching means.
A water passage 4 passes through the cooling tower 15. A portion 16 surrounded by a two-dot chain line in FIGS. 2 and 3 indicates an outdoor unit.

In the above structure, the four-way valve 1 is used during heating.
2 and the three-way valve 13 are set as shown in FIG. In this case, the refrigerant discharged from the compressor 2 reaches the indoor heat exchanger 11 from the four-way valve 12, where it radiates heat to be used for heating and condenses, and then decompresses via the expansion valve 4 to reduce the outdoor heat exchanger 10. Leading to. On the other hand, the water whose temperature has risen by recovering the waste heat of the engine 1 in the heat exchange section 8 reaches the outdoor heat exchanger 10 via the three-way valve 13 by the pump 9 and is lowered in temperature by heat exchange with the refrigerant. After that, the heat is returned to the heat exchange section 8 and is used again for recovering the waste heat of the engine 1. Then, the refrigerant heated by the heat exchange between the hot water of the engine waste heat recovery hot water system 7 and the liquid-liquid heat evaporates and flows back to the compressor 2, and is conveyed to the condenser 3 again and is used for heating.

Next, during cooling, the four-way valve 12 and the three-way valve 1
3 is set as shown in FIG. In this case, the heat exchange unit 8
The water whose temperature has risen by collecting the waste heat of the engine 1 reaches the three-way valve 13 by the pump 9 and flows into the heat radiation system 14 from here. Then, the heat is dissipated in the cooling tower 15 of the heat dissipation system 14, flows through the outdoor heat exchanger 10 in a state where the temperature is lowered, and then is returned to the heat exchange section 8. On the other hand, the refrigerant discharged from the compressor 2 reaches the outdoor heat exchanger 10 from the four-way valve 12 and radiates heat by heat exchange with the water flowing through the heat radiation system 14 to be condensed. Next, the pressure is reduced through the expansion valve 4 to reach the indoor heat exchanger 11, where it is evaporated and used for indoor cooling.

Although the heating / cooling device described above has a direct expansion type structure, the present invention is also applicable to a chiller / heater type heating / cooling device. That is, in the latter case, the second heat exchanger indicated by reference numeral 10 in FIGS. 2 and 3 may be configured to perform heat exchange with the indoor heat exchanger via the water system instead of the indoor heat exchanger. Good.

As described above, when a heating / cooling device is constructed by using the heat pump device of the present invention, it is necessary to install a heat radiation system including a cooling tower on the roof of a building. Unlike the refrigerant system, the heat radiation system has no restriction on the height difference, so that there is no difficulty in installation.

[0017]

As described above, the present invention has the following effects. Since the evaporator can be composed of a liquid-liquid heat exchanger, this part can be miniaturized and therefore can be miniaturized as a whole. It is no longer necessary to install it on the rooftop, and it can be installed on the balcony.
Therefore, the heating / cooling device using the present invention can be appropriately installed without being restricted by the height of the building. No auxiliary heat source is needed to heat the evaporator.

[Brief description of drawings]

FIG. 1 is a system diagram conceptually showing the configuration of a heat pump device of the present invention.

FIG. 2 is a system diagram for explaining a configuration of a direct expansion type heating / cooling device configured by using the heat pump device of FIG. 1 in setting during heating.

FIG. 3 is a system diagram for explaining a configuration of a direct expansion type heating / cooling device configured by using the heat pump device of FIG. 1 in setting during cooling.

[Explanation of symbols]

1 engine 2 compressor 3 condenser 4 pressure reducing valve 5 heat exchanger (evaporator) 6 heat pump system 7 engine waste heat recovery hot water system 8 heat exchange section 9 pump 10 outdoor heat exchanger (first heat exchanger) 11 indoor Heat exchanger (second heat exchanger) 12 Four-way valve 13 Three-way valve 14 Heat dissipation system 15 Cooling tower

Claims (4)

[Claims] 1. A structure in which only the refrigerant of a heat pump system using a compressor using an engine as a drive source and the water of a waste heat recovery hot water system of the engine are heat-exchanged in an evaporator. Heat pump device. 2. A compressor driven by an engine, a first heat exchanger operating as an evaporator or a condenser, and a second heat exchanger.
A heat pump system having a heat exchanger, a pressure reducing means, and a cooling / heating switching means, an engine waste heat recovery hot water system passing through the first heat exchanger, and the engine waste heat recovery hot water system can be separated by switching means. A heating / cooling device characterized by being provided with a heat radiation system to be connected 3. A direct expansion heating / cooling device, wherein the second heat exchanger according to claim 2 is configured as an indoor heat exchanger. 4. The chiller heater type heating / cooling device according to claim 2, wherein the second heat exchanger is configured to exchange heat with the indoor heat exchanger via a water path.