DE2758737A1 - Heat pump unit drive - with main medium and cooling medium flow simultaneously supplying heat within evaporator for exchange - Google Patents

Abstract

The heat pump has a cooling medium cycle with compressor, liquefier, throttle and evaporator, to withdraw heat from a medium flow. Using a common heat exchanger (4-6), the cooling medium flow within the evaporator (4), coming from the throttle (3), is simultaneously supplied with heat from the cooling medium flow supplied to the throttle, and from the main medium flow. The cooling medium flow coming from the throttle flows in reverse current past the cooling medium flow into the throttle. The main medium flows in reverse current past the cooling medium flow coming from the throttle.

Description

SIEMENS AKTIENGESELLSCHAFT Our mark

Berlin and Munich ^ VPA 77 P 8 5 4 5 FRG

Method for operating a heat pump

The invention relates to a method for operating a heat pump according to the preamble of claim 1.

In the generation of cold, it is already known to provide an additional heat exchanger in the refrigerant circuit of a refrigerating machine having a compressor, a condenser, a throttle and an evaporator. In this heat exchanger, heat from the refrigerant flow flowing into the throttle is supplied to the refrigerant Istrom coming from the throttle via the evaporator to reduce the energy losses (thermodynamics, by Han3 Dieter Baehr, Sexte 314, 3rd edition, Springer-Verlag).

The object of the invention is to improve the method used in the generation of cold for the process according to the preamble of claim 1 in favor of a higher coefficient of performance of the heat pump, a small, 3n heat transfer surface in the evaporator and a low energy consumption for generating the mass flow.
2o

The object set is according to the invention by the characterizing Part of claim 1 specified measures solved.

Appropriate further procedural measures are in claim 2 an- ■ -V **. give.

rc-h which are simultaneously provided in a common heat exchanger

~. ; ; . 7. ^ 2.1977

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77 P 8 5 4 5 FRG -έ- S 2756737

nonmene heat transfer from which the throttle is supplied Refrigerant flow and the hate flow on the refrigerant flow coming from the throttle and located in the evaporator the mean temperature difference in the evaporator is greatly reduced, resulting in a particularly high coefficient of performance of the Heat pump adjusts. At the same time, however, the low temperature difference in the evaporator also results in small heat exchanger surfaces. Small heat exchanger surfaces, on the other hand, require little material expenditure, result in a small overall volume and reduce the energy expenditure for generating the Mass flow.

Two exemplary embodiments of the invention are described with reference to the drawing. Show it: 15th

1 schematically shows a heat pump with which heat can be extracted from a liquid mass flow,

Fig. 2 schematically shows a heat pump with which heat can be extracted from a gaseous mass flow.

The heat pump shown in Fig. 1 has in its refrigerant circuit a compressor 1, a condenser 2, a Throttle 3 and an evaporator 4.

In a common heat exchanger 4, 5, 6 also containing the evaporator 4, the refrigerant flow coming from the throttle 3 and located in the evaporator 4 is at the same time heat from the the throttle 3 supplied refrigerant flow and heat from one liquid mass flow, for example groundwater, supplied. The flow of the refrigerant and the liquid mass flow is indicated by arrows.

In the in Flg. 1 shown example is part 5 of Heat exchanger 4,5,6 a pipe around which the evaporator 4 is arranged concentrically, which concentrically surrounds the part 6 of the heat exchanger 4,5,6.

The refrigerant flows in part 5 of the heat exchanger 4,5,6

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Throttle 3 closed. In the evaporator 4, the refrigerant coming from the throttle 3 is guided in countercurrent to the refrigerant flow flowing to the throttle 3 and thereby takes off heat this refrigerant flow on. 5

In part 6 of the heat exchanger 4,5,6, however, is the one Liquid mass flow supplied to feed line 7 in countercurrent to that coming from the throttle 3 and located in the evaporator 4 KühlemitteIstrom guided along. The liquid mass flow is at a standstill under the pressure of a feed pump 8, in part 6 gives off heat to the refrigerant flow coming from the throttle 3 and flows through a line 9 back.

The heat obtained in this way and absorbed in the evaporator 4 is given off in the condenser 2, for example to a Flow line 1o of a heating circuit, the return line of which is denoted by 11.

The heat pump shown in Fig. 2 is designed for the extraction of heat from a gaseous mass flow. the The mode of operation of this heat pump is basically the same as the heat pump according to FIG. 1.

The refrigerant circuit of the heat pump according to FIG. 2 has a compressor 12, a condenser 13, a throttle 14 and an evaporator 15.

In a common heat exchanger 15, 16, 17 which also contains the evaporator 15 of the heat pump, that of the throttle 14 incoming refrigerant flow located in the evaporator 15 at the same time heat from the refrigerant flow fed to the throttle 14 and heat from the gaseous mass flow.

The gaseous mass flow can, for example, be guided by a suction fan 18 over the common heat exchanger 15, 16, 17 Be ambient air.

In the example shown, the parts 15, 16, 17 of the common heat exchanger are also tubular. The pipes are lying

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parallel to each other and at right angles to the mass flow. They are also connected to one another by lamellae 19.

The gaseous wet flow, the direction of which is indicated by a strong arrow, is first over the part 17, then over the part 16 and finally over the part of the common heat exchanger 15,16,17. It will from the wet flow and through contact and conduction along the fins 19 at the same time heat to the part 15 of the common Heat exchanger 15,16,17 delivered.

The heat obtained is given off in the condenser 13, for example to a flow line 2o of a heating circuit, the return of which is denoted by 21.

2 claims 2 figures

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Claims (2)

77 P 3 5 ^ 5 3RD Claims Z ~~ 2 7 b B 7 3 7 M.) Method for operating a heat pump whose refrigerant circuit has a compressor, a condenser, a throttle and has an evaporator with which heat can be extracted from a mass flow, which means that that in a common heat exchanger (4,5,6; 15,16,17) the refrigerant flow coming from the throttle (3; 14) in the evaporator (4; 15) is at the same time heat from the throttle (3; 14) supplied refrigerant flow and heat from the mass flow is supplied. 2. The method according to claim 1, characterized in that the refrigerant flow coming from the throttle (3; 14) in countercurrent to the refrigerant flow supplied to the throttle (3; 14) and the mass flow in countercurrent is guided along the refrigerant flow coming from the throttle (3; 14). 909827/040 * ORIGINAL! NSPBCTlO