Method of determining a set point for a temperature pressure con

Details Method of determining a set point for a temperature pressure con Method of determining a set point for a temperature pressure con

1982-09-30

1984-08-07

King, Lloyd L.

Refrigeration

Processes

Evaporation induced by sorption

62476, F25B 1500

Patent

active

044635702

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a method of determining the set point in accordance with the preamble of the main claim.
Pressure and temperature controllers may be used, inter alia, in sorption heat pumps, particularly absorption heat pumps, in order to maintain at constant levels or to adjust at pre-determinable set points the pressure or the temperature in the high-pressure part of the sorption heat pump. In this connection, the high-pressure part is that portion of the generator which extends to the expansion valve in the refrigerant flow path and in the flow path for the weak solution.
As absorption heat pumps are delivered to and installed in various regions, it is rather difficult to pre-adjust the set point signal generators of such pressure and temperature controllers.
It has been found, however, that this can be effected by reference to the so-called climatic zones, into which at least the territory of the Federal Republic of Germany is divided. These climatic zones constitute regions in which respective certain lowest outdoor temperatures must be expected.
For this reason, it is an object of the present invention to provide possibilities for pre-adjusting the set point signal generators of temperature or pressure controllers of sorption heat pumps to values which are subsequently varied only in dependence on day-to-day operating conditions.
For accomplishing this object, the invention resides in the characterizing features of the main claim.
Further embodiments and particularly favorable further developments of the invention result from the subclaims and the following description, in which an illustrative embodiment of the invention will be explained more fully with reference to the drawings.
In the drawing:
FIG. 1 is a diagrammatic representation of the connections of an absorption heat pump.
The additional FIGS. 2 to 6 show diagrams.
In all figures, like reference characters designate like details.
An absorption heat pump operating on the basis of ammonia/water as shown in FIG. 1 comprises a generator 2, which is heated by a burner 1. A conduit 3 for rich solution opens in the generator and a conduit 4 for refrigerant vapor and a conduit 5 for weak solution extend from the generator.
The burner is a gas or oil burner, which is fed via a fuel supply conduit 7. The latter incorporates a fuel valve 6, which is controlled by an actuator 8, which is controlled via a control line 9 by a controller 10.
A condenser 11 is connected to the refrigerant vapor conduit 4, which is continued by a condensate conduit 12 to an expansion valve 14, which is provided with an actuator 13 and succeeded by a refrigerant conduit 16 leading to an evaporator 15.
The evaporator is fed by an ambient energy source, such as, outdoor air or underground water 17. The temperature of the source may be sensed with a temperature sensor 18, which is connected by a signal conduit 19 to the controller 10.
A refrigerant vapor conduit 20 leads from the evaporator 15 to an absorber 21, from which the conduit 3 extends back to the generator. A solvent pump 22 incorporated in the conduit 3 is controlled by an actuator 23, which is connected by a control line 24 to the controller 10.
The conduit 5 for weak solution leads to the absorber 21 and incorporates an expansion valve 26, which is controlled by an actuator 25.
The sorption heat pump heats a consumer 27, which may be a collective heating system comprising convectors or radiators, or a floor-heating system and /or a service water heater. This consumer may be heated by the heat pump directly or via a three-way or four-way mixing valve which is interposed. A return main 28 from the consumer incorporates a pump 30, which serves to circulate the heating fluid and is controlled by an actuator 29. The conduit 28 extends to a heat exchanger pipe coil 31, which is accommodated in the interior of the absorber 21. A conduit 32 leads from the pipe coil 31 to another heat exchanger pipe coil 33, which is accommodated in the interior of the condenser 11. A flow main 34 leads from the pipe coil 3

REFERENCES:
patent: 2850266 (1958-09-01), Merrick et al.
patent: 3426548 (1969-02-01), Greacen et al.
patent: 4090372 (1978-05-01), Lamb
patent: 4269034 (1981-05-01), Rzechula
patent: 4285209 (1981-08-01), Luthi et al.

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