JPH0126463B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device used as a hot water supply device, an air conditioning device, or a heating heat source for a greenhouse, etc. A condenser heats the heated fluid by exchanging heat with the heated fluid of the heated fluid circuit, and an evaporator evaporates the refrigerant by heat exchange with outside air. The present invention relates to a heat source device using an engine-driven heat pump, which is equipped with an exhaust heat recovery device for heating a fluid to be heated.

Such a heat source device using an engine-driven heat pump not only heats the fluid to be heated by the heat pump, but also uses a compressor as an engine load device and uses the engine as a heat generating device, thereby reducing heat generated by the engine. This was developed to efficiently heat the fluid to be heated by heating the heating fluid, but it had the drawback that the heating ability was significantly reduced during cold weather such as winter.

In other words, in cold weather, frost and ice buildup occur on the evaporator, and due to such frost formation and ice formation, the refrigerant evaporation action in the evaporator, that is, the heat absorption action from the outside air, significantly decreases or becomes impossible. As a result, the heating effect of the heated fluid by the heat pump is reduced or becomes impossible, and due to this, sufficient load cannot be applied to the engine by driving the compressor.
The amount of heat generated by the engine also decreases, and the heating effect of the heated fluid in the exhaust heat recovery device becomes insufficient.
Overall, the heating capacity of the fluid to be heated is significantly reduced.

The present invention has an advantage in that it attempts to rationally eliminate such drawbacks.

A heat source device using an engine-driven heat pump according to the present invention is provided with a generator that can be driven by the engine, and a heater that heats the fluid to be heated with the power generated by the generator,
The generator is characterized in that the generator and the compressor are configured to be reversely driven by the engine.

According to such a characteristic configuration of the present invention, by driving the generator with the engine, the engine load can be increased and the amount of heat generated by the engine can be increased. It is also possible to heat the heating fluid.

That is, according to the present invention, during normal times when the outside air temperature is above a certain level, only the compressor is driven by the engine, and the fluid to be heated can be heated by the condenser and the exhaust heat recovery device. When operating under adverse conditions, such as when the heat absorption effect of the evaporator is significantly reduced or disabled due to frost or ice buildup on the evaporator during the cold season, only the generator is driven by the engine. While the heat pump is stopped, the fluid to be heated can be heated by the exhaust heat recovery device and the heater. Therefore, without requiring a special generator engine or increasing the size of the engine, the fluid to be heated can be reliably heated in the most efficient manner, both under normal conditions and under adverse conditions. , can be heated well.

Embodiments of the present invention will be described below with reference to FIG.

A refrigerant circuit 4 equipped with an engine-driven refrigerant compressor 3 connected to a water-cooled engine 1 through a clutch 2 is supplied from a load device 7 through a heated fluid circuit 6 with compressed refrigerant and a pump 5. A condenser 8 that heats the fluid by indirect heat exchange with the fluid to be heated (water, etc.), an expansion valve 9, and an evaporator 1 that vaporizes the expanded refrigerant by indirect heat exchange with the outside air.
0 to form an engine-driven heat pump, and an exhaust heat recovery device 11 that heats the fluid to be heated in the circuit 6 with the exhaust heat of the engine 1 is provided. Configure a heat source device.

The load device 7 is a hot water supply device, an air conditioning device, a greenhouse, or the like.

The exhaust heat recovery device 11 includes a first heat recovery device that heats the fluid to be heated after passing through the condenser 8 using engine cooling water.
a heat exchanger 12, and a second heat exchanger that heats the fluid to be heated after passing through the first heat exchanger 12 by the engine exhaust gas.
It is composed of a heat exchanger 13.

A generator 15 is provided which is driven by the engine 1 via a clutch 14 and applies a load to the engine 1 to the same extent as the compressor 3, and the power generated by the generator 15 is used to generate the second heat. A heater 16 is provided to heat the fluid to be heated after passing through the exchanger 13, and a sensor 17 is provided to detect the temperature of the outside air near the evaporator 10. Based on the humidity detected by this sensor 17, the detected temperature is below a certain level. When the compressor clutch 2 is disengaged,
A controller 18 is provided which engages the generator clutch 14 and, when the pressure exceeds a certain level, engages the compression clutch 2 and disengages the generator clutch 14.

According to the configuration of the above embodiment, during normal times when the outside air temperature is above a certain level, only the compressor 3 is driven by the engine 1, and the condenser 8 and the first and second heat exchangers 1 are driven.
2 and 13, the fluid to be heated is heated, and the fluid is heated in the evaporator 10.
When the outside temperature is below a certain level such that frost or icing may occur, only the generator 15 is driven by the engine 1 and the heat pump is stopped, while the first,
Since the fluid to be heated is heated by the second heat exchangers 12 and 13 and the heater 16, and the engine loads by the compressor 3 and the generator 15 are approximately equal, in any of these cases, the first and second heat exchangers The heating effects at 12 and 13 are almost the same.

2 to 4 show another embodiment.

Another embodiment shown in FIG.
By providing a switch mechanism 19 that cuts off the power supply to 6B and 16C and changing the number of divided heaters used by the switch mechanism 19, the load applied to the engine 1 by driving the generator 15 can be changed to multiple stages. The switch mechanism 19 is configured to control the sensor 17 by the control mechanism 18.
It is automatically operated as appropriate based on the detected temperature.

In another embodiment shown in FIG. 3, the condenser 8 and the exhaust heat recovery device 11 are connected in parallel to
, and is provided with a flow divider valve 20.

Another embodiment shown in FIG.
, circuits 6A and 6B with pumps 5A and 5B, respectively.
The two load devices 7A and 7B are configured to be heated separately, and the condenser 8 and heater 16 are interposed in one circuit 6A, and the other circuit 6
B is equipped with an exhaust heat recovery device 11.

In each of the above embodiments, the other structures are the same as those in the embodiments, so the same reference numerals are used to omit the explanation of the structure.

Further, the sensor 17 may be one that detects the temperature or pressure of the refrigerant. That is, generator 1
5 may be one that is automatically switched between a driving state and a non-driving state based on the detection result of the refrigerant temperature or pressure.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

Fig. 1 is a piping system diagram showing an example;
4 to 4 are piping system diagrams showing different embodiments. 1... Engine, 3... Refrigerant compressor, 4... Refrigerant circuit, 6... Heated fluid circuit, 8... Condenser,
10... Evaporator, 11... Exhaust heat recovery device, 15...
... Generator, 16... Heater.

Claims (1)

[Claims] 1. Condensation in which a refrigerant circuit 4 equipped with a refrigerant compressor 3 driven by an engine 1 exchanges heat between the compressed refrigerant and the heated fluid of the heated fluid circuit 6 to heat the heated fluid. This engine-driven heat pump is equipped with an evaporator 10 that vaporizes the refrigerant by heat exchange with outside air, and an exhaust heat recovery device 11 that heats the fluid to be heated using the exhaust heat of the engine 1. In the heat source device used, a generator 15 that can be driven by the engine 1 is provided, and a heater 16 that heats the fluid to be heated with the power generated by the generator 15 is provided, and the generator 15 and the compressor 3 are connected to each other. A heat source device using an engine-driven heat pump, characterized in that it is configured so that one engine drives the other. 2. The heat source device using an engine-driven heat pump according to claim 1, wherein the generator 15 is automatically switched between a driving state and a non-driving state based on the detection result of refrigerant temperature or pressure. .