JPS58187765A - Absorption type 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 The present invention relates to an absorption type heater pump device that utilizes heat from an absorber and a condenser for hot water supply.

Conventionally, there are absorption heat pumps such as those shown in FIG. A solution with high refrigerant concentration (hereinafter referred to as concentrated liquid) discharged from the absorber 1 is sent by a pump 2 to a generator 3, where it is heated and generates refrigerant vapor.

In the case of heating, this refrigerant vapor can be sent indoors for heat dissipation, but when used for hot water supply, a condenser 5 is installed in the liquid tank 4, where it is condensed and the liquid medium in the liquid tank 4 is heat up. The condensed liquid refrigerant passes through the expansion valve 6, evaporates in the evaporator 7, and returns to the absorber 1.

On the other hand, a solution with a low refrigerant concentration (hereinafter referred to as a dilute solution) coming out of the generator 3 flows into the absorber 1 via a pressure reducing valve 8, absorbs refrigerant vapor, and regenerates a concentrated solution. Since absorption heat is generated at this time, it is necessary to remove it promptly, and the cooling liquid is circulated by a water pump 9.

Since the temperature of the coolant discharged from the absorber η has risen, the heat must be dissipated somewhere in order to be used again to cool the absorber. If the absorbed heat is not used, it may be released to the outside by air cooling, but if it is used for hot water supply, it is exchanged with the hot water heat exchanger 1o as shown in Figure 1, and the temperature of the coolant that has been raised is lowered. At the same time, the temperature of city water 11 is being raised. The coolant whose temperature has been raised here enters the liquid tank 4 from the upper part 12, and after the temperature has decreased through heat exchange, it is circulated from the lower part outlet 13 by the water pump 9.

If the outside temperature is low and the city water 11 temperature is low and the water has not been used for a long time, the water temperature at the bottom of the liquid tank 4 will be low.
Even if the condenser 5 is provided at the bottom of the liquid tank 4, the liquid tank 4
The temperature of the coolant at the bottom does not rise easily. Therefore, absorber 1
A situation occurs where the coolant temperature is too low. If the absorber 10 inlet coolant temperature is too low, the low pressure of the cycle will also be too low. If this happens, the maximum temperature of the absorber 1 will inevitably decrease, and the temperature of the coolant at the outlet of the absorber will also decrease. Due to the nature of hot water supply, this is extremely inconvenient as it goes against the goal of obtaining a high temperature.

In view of the problems of the prior art described above, the present invention is an example of solving the problem of a drop in absorber coolant temperature by utilizing condensation heat. The details will be explained below according to implementation.

FIG. 2 shows the main parts of an embodiment of the present invention, in which a main condenser 15 and a hot water heat exchanger 16 are disposed within the liquid tank 14. The coolant circulated by the pump 17 is supplied to the absorber 1
After cooling the liquid 8, it flows into the liquid tank 14 through the inlet 19. The temperature of the cooling liquid in the liquid tank 14 rises due to the heat of absorption and the heat of condensation from the main condenser 15, and the temperature of the cooling liquid in the liquid tank 14 increases.
The temperature at the outlet 21 is low due to heat exchange. Further, although not shown, a hot water heat exchanger 16 is provided indoors, and the coolant is circulated by a separate pump, and the coolant is returned to the lower part of the liquid tank 14 as a low-temperature liquid in the same manner when used for heating.

This low temperature cooling liquid flows into the auxiliary condenser 22 from the outlet 21. The refrigerant gas from the generator 3 first flows into this auxiliary condenser 22 and exchanges heat with the cooling liquid before entering the main condenser 15 . On the other hand, the coolant heated by heat exchange is pumped to pump 1.7.
Return to

In this way, the coolant returned to the absorber 1gff) inlet receives part of the condensation heat, so the amount of hot water supply decreases slightly. 20, the temperature of the coolant at the inlet of the absorber 18 does not drop too much.

The low pressure of the absorption cycle does not fluctuate widely. Therefore, the absorber outlet coolant temperature can be maintained at a predetermined temperature. This means that at the outlet of the city water 2o, heat is constantly exchanged with the high-temperature cooling liquid, and hot water can be obtained at a high temperature from the start.

FIG. 3 shows main parts of a different embodiment of the present invention, and parts common to those in FIG. 2 are given the same numbers. The hot water heat exchanger 23 is connected to the first liquid tank 24, the main condenser 25 is connected to the second liquid tank 26, the auxiliary condenser 28 and the sensor 29 are connected between the outlet 27 and the pump 17, and the main condenser 26 and A switching valve 30, 31 is provided in the refrigerant circuit of the auxiliary condenser 28.

The refrigerant circuit includes a switching valve 30 - a main condenser 26 - a switching valve 31,
Switching valve 30 - auxiliary condenser 28 - switching valve 31 and switching valve 3
〇-Auxiliary condenser 28-Main condenser 26-Switching valve 31
The circuit can be switched. Therefore, depending on the temperature detected by the sensor 29, the refrigerant can be switched to flow through the auxiliary condenser 28 if it is below the set value, only to the main condenser 25 if it is above the set value, and only to the auxiliary condenser 28 if it is extremely low. This prevents coolant temperature from dropping and maintains low pressure in the cycle.
In other words, the temperature of the absorber outlet liquid can be maintained.

As described above, the present invention provides a heat exchange circuit with condensation heat in the liquid tank coolant flow path provided in the coolant flow path of the absorber of an absorption heat pump cycle, so that it can be used when the coolant temperature is low or when the city water Even when the temperature is low and as a result, the coolant temperature is too low, the absorber outlet coolant temperature can be maintained and a high hot water supply temperature can be ensured.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an absorption heat pump device according to an embodiment of the conventional example, Fig. 2 is a diagram showing a main part of an embodiment of the present invention, and Fig. 3 is a diagram showing main parts of a different embodiment of the present invention. FIG. 18...Absorber, 14 liquid tank, 16...
...Hot water heat exchanger, 15...Main condenser, 22.
...Auxiliary condenser. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 2

Claims (3)

[Claims] (1) An absorption heat pump characterized in that a generator, a condenser, an evaporator, and an absorber are provided with an auxiliary condenser that exchanges heat with the liquid medium in a flow path from at least one medium outlet to the absorber. Device. (2) The absorption heat pump device according to claim 1, wherein the auxiliary condenser is branched from the condenser. (3) The absorber according to claim 1 or 2, wherein the liquid medium tank has a heat exchanger that exchanges heat between the liquid medium and the condensation heat of the condenser and the absorption heat of the absorber. type heat pump device.