JPS6166060A - Engine-heat pump device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an engine-driven heat pump device, and particularly to an engine heat pump device that can operate with high output and high efficiency even when the outside temperature is low. It is something.

[Prior Art] In general, an engine-driven heat pump device is capable of recovering exhaust heat from engine exhaust gas or heat from water cooling using an exhaust gas heat exchanger or a cooling water heat exchanger. It is more efficient in energy use than other devices, and is used in various types of water heaters. This engine heat pump device, for example,
As shown in the figure, a compressor 2 is driven by an engine 1, and the refrigerant forms a circulation path through compression R2 → water-cooled condenser 3 → expansion valve 4 → evaporator 5 and returns to the compressor 2 again. . In addition, a cooling water heat exchanger 6 and an exhaust gas heat exchanger 7 are provided in the cooling water circulation path and exhaust gas path of the engine 1, and hot water (brine) is transferred from the water-cooled condenser 3 to the water-cooled condenser 3 by a pump 8.
A hot water circuit is formed from the cold Al water heat exchanger 6 to the exhaust gas heat exchanger 7 and back to the pump 8 via a buffer tank (not shown). The hot water is then used as a heat source for a hot water supply facility (not shown) or the like. The exhaust gas that has passed through the exhaust gas heat exchanger 7 is discharged to the outside through a muffler 9.

[Problems to be Solved by the Invention] However, in such a conventional engine heat pump device, especially in winter (1) when the outside temperature is low, a sufficient amount of evaporation of the refrigerant in the evaporator 5 cannot be achieved. (heat exchange amount) is not obtained, leading to a decrease in hot water supply capacity and other problems, as well as a decrease in the efficiency of the refrigerant cycle.

In addition, Japanese Patent Application Laid-open No. 57-70368 discloses a conventional technology related to a hot fluid production device, but in this conventional technology, an exhaust heat recovery device is installed in the hot water circulation path, so the refrigerant is not used. Evaporation could be directly affected by the humidity of the hot water flowing through the waste heat recovery device.

The present invention has been made by focusing on such conventional problems, and even when the outside air temperature is low and the refrigerant cannot obtain a sufficient amount of heat exchange in the evaporator, the hot water temperature, The purpose is to provide an engine heat pump device that can heat the refrigerant without being affected by outside temperature, etc., obtain sufficient evaporation ff1 (heat exchange amount), and operate with high output and high efficiency. It is said that

[Means for Solving the Problems] In order to solve the above problems, the engine heat pump device of the present invention uses engine-driven compression.

A first refrigerant circuit that sequentially connects a water-cooled condenser, a first expansion valve, and a first evaporator;
a hot water (brine) circuit, and a second refrigerant circulation branched from the refrigerant pipe on the outlet side of the water-cooled condenser in the refrigerant circulation path and connected to the low-pressure side pipe of the compressor via a second expansion valve and a second evaporator. a second hot water (brine) circulating through a second evaporator and an exhaust gas heat exchanger and a second evaporator provided in the exhaust gas path of the engine;
It consists of a circuit.

[Operation] Next, the operation will be explained. This invention provides a second refrigerant circulation path parallel to the first refrigerant circulation path, and a second refrigerant circulation path that circulates through a second evaporator in the second refrigerant circulation path and an exhaust gas heat exchanger provided in an exhaust gas path of the engine. Since two hot water circuits are installed, the refrigerant flows into the second refrigerant circulation path,
It is heated and evaporated in the second evaporator by the exhaust heat of the exhaust gas from the second hot water circuit. Therefore, even if the outside air temperature is low and the first evaporator in the first refrigerant circuit cannot obtain a sufficient amount of evaporation (heat exchange amount) of the refrigerant, the second evaporator exchanges heat with the exhaust gas exhaust heat. In the evening, the entire device can be operated with high output and high efficiency.

Further, since the second hot water circuit constitutes a circuit independent of the first hot water circuit, it is possible to recover the exhaust heat of the exhaust gas without being affected by the hot water temperature of the first hot water circuit.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system diagram of an engine/heat pump device according to an embodiment of Mufa Tsui.

In this figure, reference numeral 11 is an engine, and 12 is a compressor driven by this engine 11. The first refrigerant circulation path 13 of this engine heat pump device is connected from the 8-pressure side of the compression ring 12 to the water-cooled i condenser 14-→the first expansion valve 15.
→It circulates to the low pressure side of the compressor 12 via the first evaporator 16. A cooling water heat exchanger 17 is connected to the cooling water circulation path of the engine 11 to recover heat generated by cooling the engine 11 with water. A pump 18 is connected to the hot water inlet side (brine inlet side) of the water-cooled condenser 14.
It is connected to the back tank (not shown) through the
The first hot water circuit 19 forms a circulation path from the buffer 1 tank, through the pump 18, the water-cooled condenser 14, the cooling water heat exchanger 17, and back to the buffer tank.

On the other hand, a conduit 20 on the outlet side of the water-cooled condenser 14 of the first refrigerant circulation path 13 is branched from the conduit 20 and has a second expansion valve 2.
A second refrigerant circulation path 24 is provided which is connected to the low pressure side pipe 23 of the compressor 12 via the first and second evaporators 22 in sequence. Further, an exhaust gas heat exchanger 25 is provided in the exhaust gas path of the engine 11. And the exhaust gas is
The exhaust gas is discharged from the exhaust gas heat exchanger 25 to the outside via a muffler 26. Further, the exhaust gas heat exchanger 25 is connected to the second evaporator 22 via a pump 27 so as to circulate, thereby forming a second hot water circuit 28.

In such a configuration, the engine 11 starts and the compressor 1
2 is driven, the refrigerant flows through the first refrigerant circulation path 13 and the first evaporator 16 pumps up heat from the low heat source. Also, the first
A part of the liquid refrigerant that has passed through the water-cooled condenser 14 in the refrigerant circuit 13 flows through the second refrigerant circuit 24 , is depressurized by the second expansion valve 21 , and is transferred to the second hot water circuit 28 in the second evaporator 22 . It is heated by heat exchange with hot water, evaporates, and returns to compression 112 again.

Therefore, even when the outside air temperature is low during winter and the first evaporator 16 cannot exchange enough heat with the refrigerant, the second evaporator 22 can exchange heat with the exhaust heat of the exhaust gas. As a whole, the hot water supply capacity of the device can be improved and it can be operated with high efficiency. Furthermore, since the second hot water circuit 28 is an independent circuit from the first hot water circuit 19,
It is not affected by the hot water temperature of the hot water circuit 19.

In the above embodiment, a switching valve or the like may be provided in the refrigerant circulation path so that part or all of the refrigerant is directed to the second refrigerant circulation path 24 only when the outside temperature is low. Furthermore, the first hot water circuit 19 and the second hot water circuit 28 only need to be independent, and their systems can be arbitrary.

[Effect of the invention 1] As explained above, according to the present invention, since the second refrigerant circuit is provided in the refrigerant circuit in which the refrigerant is heated and evaporated by the exhaust heat of the exhaust gas, the outside temperature is low and the refrigerant is Even if sufficient heat exchange cannot be performed in the evaporator, sufficient refrigerant evaporation m (heat exchange m) can be obtained without being affected by hot water temperature, outside air temperature, etc., resulting in high output and high efficiency. It has the effect of being able to operate.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an engine heat pump device according to an embodiment of the present invention, and FIG. 2 is a system diagram of an engine heat pump device according to a conventional example.
It is a system diagram of a heat pump device. 11... Engine 12... Compressor 13... First refrigerant circulation path 1
4... Water-cooled condenser 15... First expansion valve 16...
-First evaporator 19...First hot water circuit 21...Second expansion and expansion valve 22...Second evaporator 24...Second refrigerant circulation path 25...Exhaust gas heat exchanger 28 ...Second hot water circuit Figure 1 Figure 2

Claims (1)

[Claims] a first refrigerant circulation path that sequentially connects a compressor driven by an engine, a water-cooled condenser, a first expansion valve, and a first evaporator; a first brine circuit that circulates the water-cooled condenser; and the first refrigerant. a second refrigerant circuit branching from the outlet side refrigerant pipe of the water-cooled condenser of the circulation path and connected to the low-pressure side pipe of the compressor via a second expansion valve and a second evaporator; and exhaust gas of the engine. the exhaust gas heat exchanger provided in the passageway and the second
An engine heat pump device comprising a second brine circuit that circulates through an evaporator.