DE3216491A1 - Sorption heat pump - Google Patents

Abstract

The present invention relates to a sorption heat pump, particularly an absorption heat pump with a generator, condenser, evaporator, absorber, solvent pump, and ducts connecting these, throttle points and also a condensate return from the condenser to the generator, using a distributor element. The object of the invention is to use the setting of this distributor element for different control and regulation processes for the absorption heat pump. The final setting of the distributor element, in which the evaporator is blocked for the coolant path, signifies that the plant must be operated as a boiler and no longer as a heat pump. The invention comprises coupling to the setting of the distributor element a transducer for adjusting the output of the heat source and for adjusting the solvent throughput.

Description

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Joh.Vaillant GmbH u.Co DE 897

04/27 S2

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Sorption heat pump

The present invention relates to a sorption heat pump according to the preamble of the main claim

It is known to provide such sorption heat pumps with a distribution element connected downstream of the condenser in order to refrigerant not supplied directly to the evaporator due to a low temperature level of the environmental energy source to be put back into the expeller and thus not have to store in the evaporator and / or condenser. The distributing body can be controlled by the most varied of sizes.

The present invention is based on the object

Positions of the distributor for other tax and Use control processes on an absorption heat pump. The invention is based on the knowledge that an end position of the distributor, in particular the end position in which the evaporator is shut off for the refrigerant path is or is almost completely throttled, signals that the system is no longer as a heat pump, but in the boiler mode must be operated and that therefore the supply of primary

primary energy in the expeller and the throughput of solvent can be increased according to the required heat output have to.

According to the invention, this object is achieved in the characterizing features of the main claim.

Further refinements and particularly advantageous developments of the invention are the subject of the subclaims or emerge from the following description, which schematically explains an embodiment of the invention with reference to the figure.

In the figure, a schematic representation of the line routing of an absorption heat pump is shown.

The absorption heat pump has an expeller 1 in which a solution-refrigerant mixture from a burner 2 is heated is, the one provided with a solenoid valve 3

Fuel supply line 4 primary energy is supplied. The solenoid valve 3 has an actuating magnet 5 which, via an actuating line 6, is connected to a regulating or control unit 7 is connected. A setpoint generator 9 is connected to the regulating or control unit 7 via a setpoint line 8, whose setpoints can be preset automatically or manually via a setpoint adjuster 10.

A line 11 for refrigerant vapor leads from the expeller 1 to a condenser 12, from which in turn a condensate line 13 leads to a three-way valve 14, its servomotor 15 via a control line 16 to the control and regulation unit 7 is connected.

The three-way valve 14 has a connection which is connected to a line 17 which leads back to the expeller 1 leads or is connected to line 11. The second output of the three-way valve is connected to a line 18 connected, which leads to an evaporator 21 via an expansion valve 20 that can be actuated by a servomotor 19, in the interior of which a temperature sensor 22 is provided, which is connected to the control and regulating unit via a measuring line 23 7 is connected.

A line 24 for evaporated refrigerant leads from the evaporator 21 to an absorber 25 to which a line 26 for the poor solution leaving the expeller 1 is also connected sen is. The absorber leaves a with one of a control

Motor 27 adjustable in throughput solvent pump 28 provided Rich solution line 29 leading to expeller 1.

A consumer circuit 30 has a consumer 31, the return line of which is provided with a heating circulation pump 32 33 leads to a heat exchanger coil 34 arranged in the interior of the absorber 25, which via a line

device 35 is connected to a further pipe coil 36 arranged in the interior of the condenser 12, which in turn Connected to the consumer 3I via a flow line 37 is.

The absorption heat pump just described has the following function:

By heating the expeller 1 by means of the burner 2 generated exhaust gas is located in the expeller 1 by the solvent pump 28 supplied rich solution in poor solution and refrigerant vapor separated, the poor solution via line 26 after relaxation via a not The expansion valve shown enters the absorber 25 directly. The refrigerant vapor reaches through the pipe 11 the capacitor 12 and is there as a result of the cooling condensed by the consumer circuit 30. The condensate reaches the three-way valve 14 via line 13 · Some of the condensate is released depending on the position of the three-way valve directly into the expeller via line 17

returned, the remaining part reaches the evaporator via the line 18 after relaxation in the expansion valve 20 21. Evaporated refrigerant is fed into the absorber 25 via the line 24 and absorbed by the poor solution. For the absorption is the cooling of the absorber by the consumer circuit 30. The distribution of the refrigerant vapor flows on lines 17 and 18 depends on the evaporation capacity of the evaporator and the absorption capacity of the absorber. These depend on the temperature of the environmental energy source, which is measured via the temperature sensor 22 is measured, and the consumer flow temperature. Dependent on of the measured evaporation capacity and the absorption capacity of the absorber is accordingly the position of the three-way valve 14 is controlled. The setpoints of the evaporation and absorption capacities can, for example, depending on the prevailing outside temperature and thus the The flow temperature of the consumer can be specified in a sliding setpoint via the setpoint generator 9. This setpoint is also a function of the type of consumer, in particular depending on the consumer flow temperature, the with radiator heating is greater than with underfloor heating and even higher with a domestic hot water tank can. The consumer circuit is heated in two stages, first in the absorber, then in the condenser and feeds the actual circuit Consumer 31 from an underfloor heating system or a water heater.

The lower the evaporation capacity of the evaporator due to

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the temperature level of the environmental energy source and the absorption capacity of the absorber due to the higher flow temperatures of the consumer, the stronger the valve becomes 14 from the servomotor 15 in the direction of an increased return adjusted by condensed refrigerant. That means that as the outside temperature falls, it rises with an outside air-fed one Absorption heat pump, the reflux of refrigerant in line 17 on. If the valve 14 now reaches its end position,

so this is a sign that due to the lack of temperature level the environmental energy source at the then required high flow temperatures, the heat pump is no longer in is able to provide the consumer 51 with sufficient heat to supply the required temperature level. As the outside temperature falls, the performance of the On the other hand, the heat demand of the consumer increases. Thus you can reach the end position of the valve 14 to take advantage of the regulating and control device 7 the expeller of the heat pump by a corresponding adjustment of the solenoid 5 of the proportional solenoid valve 3 to supply more fuel, so that the cooker 1 is heated more strongly. In parallel, the servomotor is operated via line 38 27 adjusted for the solvent pump 28, so that the throughput of rich solution from the absorber into the expeller is increased. Adjustment of the fuel flow to burner 2 and the solvent flow through the solvent pump 28 is coupled and in the same direction. This means that with a rising temperature level of the environmental energy source burner 2 has reduced its output

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will drive, so will the solvent throughput withdrawn by the solvent pump 28. The arrangement on the three-way valve 14 can be made so that the end positions for maximum throughput through the line 17 or maximum throughput through the line 18 limit switches are assigned, one of which is a limit switch 39 is shown, which is coupled to the valve member of the three-way valve via an operative connection 40. Of the Limit switch 39 is via a line 41 with the control and Control device 7 connected.

It would also be possible to remove the end position of the three-way valve 14 with a view to removing the evaporator 21 to use the refrigerant circuit in the course of consumption rkreislaufs 30, connected downstream of the capacitor 12, to provide an additional heat exchanger, which is fed via a further burner, this burner then with fuel is acted upon by a solenoid valve when the valve 14 is elongated into the corresponding end position.

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Claims (4)

Joh.Vaillant GmbH u.Co DE 897 2 7th Oi 82 Expectations Sorption heat pump with an expeller heated by a heat source, a condenser, evaporator, Absorber, solvent pump and lines connecting them, throttling points in the refrigerant / solvent path and a condensate return from the condenser to the expeller using a Distributor for the refrigerant vapor distribution in the direction of the evaporator on the one hand / expeller on the other hand, characterized in that with the position of the distributor (14) a transmitter (39,40) for a Adjustment of the power of the heat source (2) and for adjustment of the solvent throughput (28) is coupled. O ο Λ c I Q Λ j AFTER © ER £ 2. Sorption heat pump according to claim one with a three-way valve as a distribution element, which has connections from the condenser and to the evaporator "or to the expeller is provided, characterized in that that the end positions of the valve (14) switches (39) are assigned which are a variation the power of the heat source (2) or the solvent throughput (28). 3. Sorption heat pump according to claim one or two, characterized in that the end position of the Distributor (14) in the direction of the predominant return flow of the refrigerant vapor to the expeller (1) an increase in the power of the heat source and an increased solvent throughput are assigned. 4. Sorption heat pump according to one of claims one to three, characterized in that in the course of Consumer circuit (30) an additional heat exchanger is arranged, which is from a further heat source is fed, and that the heat source for the additional heat exchanger is released when the valve is his End position reached.