JPS60174468A - Heat pump device for air-conditioning - 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 a heat pump device for air conditioning and heating, which has a compressor driven by an internal combustion engine.

[Prior art]

Conventionally, when heating using a HEATBO/P type air conditioning system, if the outside air temperature drops and the heating capacity is insufficient,
As an auxiliary heat source, an appropriate electric heater was installed in the indoor heat exchanger, and the heat generated by the heater compensated for the lack of heating capacity, but since electricity was used as the heat source, operating costs were high. However, it has the disadvantage that the warm control mechanism is relatively complicated.

However, it is also possible to install an auxiliary heat source mechanism such as a hot water boiler separately from the air conditioning system and send hot water to the indoor heat exchanger to use it as an auxiliary heat source when heating capacity is insufficient. In this case, the disadvantage was that the equipment costs were high.

Therefore, in view of the above facts, we installed a refrigerant heater in the air-cooled heat pump type air-conditioning system that can change the heat capacity appropriately according to the temperature of the intake gas of the compressor during heating, and By arranging the temperature-sensitive element of the temperature-sensitive expansion valve on the outlet side conduit of the refrigerant heater, stable heating is possible regardless of the drop in outside temperature, and the degree of superheating of the compressor suction gas is stabilized. Japanese Utility Model Publication No. 46-33816 has been devised to provide an air-cooled heat pump type air-conditioning and heating system that can improve operating efficiency by increasing the temperature of the air. The disadvantage is that it requires

On the other hand, an internal combustion engine is connected to a compressor of a refrigerator, and a high-temperature fluid passage that circulates between the condenser of the refrigerator and the /ring cooling section of the internal combustion engine, and a low-temperature fluid passage from this internal combustion engine to the evaporator are installed. A waste exhaust passage to the heat exchanger is provided, another heat exchanger is placed in the high temperature fluid passage intersecting with the bleed gas passage, and a radiator is provided in the circulation passage for the high temperature fluid that has passed through the heat exchanger. There has also been an invention published in Japanese Patent Publication No. 41-5859 concerning a heat pump system in which a fluid transfer device such as a pump is installed and a refrigerator is driven by internal combustion. In this case, the exhaust gas of the internal combustion engine is A heat exchanger heats the cooling water, and another heat exchanger heats the low-temperature fluid, but it is not recovered as a heat source for the heat pump.

[Purpose of the invention]

Therefore, the present invention solves the drawback of conventional heating and cooling heat pump devices, in which the heating capacity decreases when the outside temperature changes, and provides a heat pump device that can be used even in cold regions without decreasing the heating capacity. The purpose is to provide the following.

[Structure of the invention]

That is, the heat pump device for air conditioning and heating of the present invention is a heat pump device for air conditioning and heating that has a compressor driven by an internal combustion engine, and uses a part of the waste heat recovered from the internal combustion engine only when the outside air temperature decreases during heating. It is constructed by using an outside air heat source as a heat source.

[Implementation) 2] Each embodiment of the present invention will be described below with reference to the drawings, and the same parts in each embodiment are indicated by the same part numbers.

First, FIG. 1, FIG. 2, and FIG. 3 show a heat pump system JKj for heating and cooling in Embodiment 1 of the present invention.

In this system flow diagram, when this device is cooling, as shown in Figure 1, the refrigerant fluorocarbon r, which absorbs heat from the cold water WC in the water/fluorocarbon heat exchanger 6 into which the cold water WC is introduced, is indicated by the bold line. As shown by the arrow, it is compressed by the compressor 1 driven by the internal combustion engine 10 from the four-way valve 2. After dissipating heat to the outside air in the air/fluorocarbon heat exchanger 7, the heat passes through the liquid receiver 4 from the circuit shown by the thick arrow, is expanded by the cooling expansion valve 5, and is circulated again to the water/fluorocarbon heat exchanger 6. This provides a cooling function.

On the other hand, the exhaust gas
5, and is discharged to the outside via the exhaust gas muffler 16. In this case, the cooling water We in the engine cooling water circuit 28 of the internal combustion engine IL) is pumped by the engine cooling water pump 12 as shown by the thick arrow. It is pressurized, passes through an oil cooler 11 and a water jacket inside the internal combustion engine 10 (not shown), and then passes through a temperature control valve 16.
The exhaust gas heat exchanger 15 is heated to 30.degree.
20 and is again circulated by the engine cooling water pump 11.

Note that 8 in the figure is a motor fan for the air/fluorocarbon heat exchanger Z, and the dimension 21 is an expansion tank provided in the engine cooling water circuit 28.

Next, during normal heating operation of this device, the refrigerant fluorocarbon r in FIG.
Heat is absorbed from the outside air via the fluorocarbon circuit 27, from the heating expansion valve 6, through the air/fluorocarbon heat exchanger 7, and after being compressed by the compressor 1 via the four-way valve 2, it is transferred again via the four-way valve 2 to the water/fluorocarbon heat exchanger. 6, and after dissipating the heat into the hot water Wh from the cold/hot water circuit 29, it returns to the liquid receiver 4, circulates through the circuit indicated by ``='', and performs the heating function.

In this case, the cooling water We for the internal combustion 1 and 10 is (Ebisuki cooling water pump 12, oil cooler 11, water jacket in the engine, temperature control valve 13, exhaust gas heat exchanger 15, 3-way valve 19
and 20, as shown by the thick arrow, passes through the waste heat recovery evaporator 9 and radiates heat to hot water Wh in the cooling water heat exchanger 26 provided in the cold/hot water circuit 29, and then cools the engine in the engine cooling water circuit 28. The cooling water pump 12 circulates the water.

Therefore, when the outside air temperature decreases during heating, the low pressure side of this heat pump device, that is, the evaporation pressure, decreases due to the decrease in outside air temperature, and the pressure switch 25 shown in FIG. 26 is opened, and in addition to the air/fluorocarbon heat exchanger 7 that is constantly used in the heat pump device, the evaporator 9 for waste heat recovery is also used in parallel.

That is, in this case, in contrast to the fluorocarbon f circulation circuit in FIG. 2 and the cooling water We circulation circuit in FIG. In addition, the heat absorbed from the hot water for waste heat recovery is also utilized via the waste heat recovery evaporator 9.

Note that 24 in FIG. 3 is an expansion valve for the waste heat recovery evaporator 9.

The Mollier diagram showing the relationship between pressure P and enthalpy 1 corresponding to each part from A to ■ in Figure 3 above is shown in Figure 4.
The amount of heat pumped up from the outside air is G,
(i, −, I, , and the amount of heat pumped up from the recovered waste heat of the internal combustion engine 10 is Q2(i++−IG).

Therefore, if the heat pump device for air conditioning according to Practical IRm Example 1 of the present invention is used, in the relationship diagram between heating capacity (output) and outside air temperature in Fig. 5, when the outside air temperature decreases during heating, the conventional heat pump device In contrast, the heating capacity of the two-way solenoid valves 22 and 23 of the present invention was
By opening the waste heat recovery fluorocarbon circuit 60, the heating capacity J increases as shown in the diagram a, and the heating capacity improves only in the shaded area.

Next, FIG. 6, FIG. 7, FIG. 88, and FIG. 9 show a heat pump device for heating and cooling according to a second embodiment of the present invention, which has almost the same configuration and function as the first embodiment. However, the difference is that the four-way valve 2 and the air/fluorocarbon heat exchanger 7 are not provided in the waste heat recovery fluorocarbon circuit 30 in the first embodiment.
A refrigerant heat exchanger 9A is installed directly in the fluorocarbon circuit 27 between the heat pump system and a part of the waste heat recovered from the cooling water We from the internal combustion leakage gate 10, which is used in conjunction with the outside air heat source as a heat source for this heat pump device. Furthermore, a pressure switch 25A for high pressure and a pressure switch 25B for low pressure are provided between the four-way valve 2 of the fluorocarbon circuit 27 and the refrigerant heat exchanger 9A.

Therefore, during normal cooling when the outside air temperature is low, as shown in FIG. The heat radiator 17 circulates in the direction of the thick arrow while radiating heat.

Next, during cooling when the outside air temperature is high, as shown in FIG.
The solenoid valve 22 is closed and the solenoid valve 26 is opened, and the refrigerant heat exchanger 9A is added in series to the air/fluorocarbon heat exchanger 7, thereby reducing the condensing pressure of the heat pump device and providing cooling when the outside temperature rises. Capacity and cooling coefficient of performance, 1. ! l! Therefore, it is possible to improve the decrease in system efficiency.

On the other hand, during normal heating when the outside air temperature is high, as shown in FIG. The cooling water We of the internal combustion engine 10 circulates in the direction of the cutout j indicated by the thick line while dissipating heat to the hot water Wb in the cooling water heat exchanger 26.

Therefore, during heating when the outside air temperature is low, as shown in FIG.
The hot water recovered from the cooling water We flows into A, the amount of heat pumped by the heat pump device increases, and the driving power of the compressor 1 also increases.The combined effect of this increases the capacity of the heat pump device, thereby decreasing the outside air temperature. Prevents the heating capacity from decreasing during heating.

In addition, the two-way electric ox valve 2 used in this embodiment 2
FIG. 10 shows a circuit diagram of a pressure saw switch 25A for high pressure and a pressure saw switch 25B for low pressure, which are connected to the air conditioner 2, 23 and the heating/cooling changeover switch 61.

In addition, in the heat pump device for cooling and heating of the above-mentioned Example 2, a Mollier diagram showing the relationship between pressure P and enthalpy 1 during normal cooling when the outside temperature is low as shown in FIG. 6 is shown in FIG. , the range indicated by the arrow 7 in the figure shows the heat radiation in the air/fluorocarbon heat exchanger 7.

Next, Fig. 12 shows a Mollier diagram during cooling when the outside air temperature is high, as shown in Fig. 7, and the range indicated by arrow 7 is
The heat dissipation in the fluorocarbon heat exchanger 7 is shown by the arrow 9A.
1i and 12 are the heat radiation in the refrigerant heat exchanger 9A, respectively.
It's happening.

On the other hand, FIG. 13 shows a Mollier diagram during normal heating when the outside air temperature is high as shown in FIG. Furthermore, Fig. 14 shows the Mollier diagram when the outside air temperature is low in the 1-ho direction shown in Fig. 9, and the 11th circle indicated by arrow 7 represents the heat absorption in the air/fluorocarbon heat exchanger 7, and the arrow 9A The ranges indicated by the arrows indicate the heat absorption in the refrigerant heat exchanger 9A.

〔Effect of the invention〕

Therefore, if the heat pump device for cooling and heating of the present invention is adopted, the drawback of the air heat source type heat pump device that the heating T pressure decreases when the outside air temperature decreases is eliminated, and the heating capacity, that is, the output of the heat pump device is increased. As a result, the heat pump device of the present invention can be used satisfactorily even in cold regions.

Furthermore, the present invention effectively utilizes a portion of the waste heat recovered from the internal combustion engine within the heat pump device, and is economical because it does not use an external heat source.

Note that the present invention can be effectively applied mainly to an air heat source type internal combustion engine-driven heat pump device.

[Brief explanation of drawings]

1, 2, and 3 are system flow diagrams showing different states of the heat pump device for cooling and heating in Embodiment 1 of the present invention, and FIG. 4 is a Mollier diagram of the heat pump device in Embodiment 1, and FIG. Figure 5 is a diagram showing the heating capacity with respect to outside air temperature in the conventional example and Example 1, and Figures 6, 7, 8, and 9 are system flows showing different states of the heat pump device in Example 2. figure,
Figure 10 is a circuit diagram of each pressure switch that operates the two-way solenoid valve used in Embodiment 2, and Figures 11, 12, 13, and 14 are Embodiment 2 shown in Figures 6 onwards. 1 is a series of Mollier diagrams of heat pump devices in
Figure 1 is similar to Figure 6, Figure 12 is similar to Figure 7, and Figure 13 is similar to Figure 8.
In the figures, FIG. 14 corresponds to FIG. 9, respectively. 1...Compressor, 3...Water/Freon heat exchanger, 4...
Receiver, 7...Air/fluorocarbon heat exchanger, 9A...Refrigerant heat exchanger, 9...Steamer for waste heat recovery, 10...Internal combustion engine, 15...Air/gas heat exchanger Vessel, 19, 20...
・3-way valve 22, 23... 2-way solenoid valve, 25, 25
A, 25B... Pressure switch, 26... Cooling water heat exchanger, 27... Freon circuit, 28... Engine cooling water circuit, 30... Freon circuit for waste heat recovery, f... Freon , We...cooling water, Wc...cold water, Wh...hot water, X...exhaust scum. Figure 1 n Figure 3 Outside air temperature

Claims (1)

[Claims] A heat pump device for air conditioning and heating having a compressor driven by an internal combustion engine, characterized in that a part of the waste heat recovered from the internal combustion engine is used in combination with the outside air heat source as a heat source for the heat pump device only when the outside air temperature decreases during heating. A heat pump device for heating and cooling.