DE3126325A1 - Heat-pump installation - Google Patents

Abstract

In a heat-pump installation, two compressors (2, 3) with capacities of different size, and furthermore a condenser (4) which is in heat exchange with a heating circuit which has a forward run (5) and a return run (6) are provided. The smaller compressor (3) can be connected to an intermediate heat exchanger (10), the heat removal side of which can be connected to a water heater and is connected to the return run (6) via a closable line (12) as well as an open line (13). The line (12) in front of and the line (13) behind a throttle valve (14) is connected to the return run (6). The throttle valve (14) and a valve (16) in the line (12) are connected to a flow monitor (17) in such a manner that, in the case of demand for hot water, the valve (16) is closed and the throttle valve is opened and, in other operation, the valve (16) is opened and the throttle valve (14) is closed. <IMAGE>

Description

KKW Kulmbacher air conditioning units - Our sign Werk GmbH VPA 81 P 8 5 2 3 DE

Heat pump system

The invention relates to a heat pump system according to the preamble of claim 1.

There are already heat pump systems in the generic term of claim 1 mentioned type known (Siemens heat pump 2WP2 232, DE-OS 28 34 932, DE-OS 27 45 638).

There are already heat pumps, which are in Have a heat exchanger device in the direction of flow of their refrigerant circuit upstream of the condenser, to which a heat storage tank is assigned.

The object of the invention is the heat pump system to train the genus mentioned in the preamble of claim 1 so that with her on particularly economical way © in the heating cycle and / or hot water can be prepared.

The given task is carried out according to the invention those in the characterizing part of the patent claim 1 specified training solved »

An expedient © further development of the subject matter of the invention is in claim 2

It is advantageous to “use the compressor with the lower To interpret performance in such a way that he is straight to the Warawassery preparation is sufficient. Depending on the dimensioning of the compressor with the lower performance

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then, especially in the summer months, only as much energy has to be expended as is required for the desired Amount of hot water is required. It is also advantageous that the return of the heating circuit in the Can be used for hot water preparation in both summer and winter. The return has in summer regularly a higher heat content than water supplied from the mains. This affects has a positive effect on the performance figure of the heat pump. In winter, the intermediate heat exchanger is included Fresh water fed. The fresh water is, however, absorbed by heat from the line that is free at all times preheated before it enters the intermediate heat exchanger.

An embodiment of the invention is shown in the drawing, which is a scheme of a heat pump system shows.

In the drawing, 1 is a refrigerant circuit of a heat pump, which is delimited by dash-dotted lines designated.

In the refrigerant circuit 1 in parallel next to each other two compressor 2,3 are arranged, which _s, are together switched on individually or as needed.

In the refrigerant circuit 1 is also located a condenser 4. This is in heat exchange with a heating circuit, which has a flow 5 and has a return 6.

The refrigerant circuit 1 also has a throttle device 7 and an evaporator 8. 35

The compressors 2,3 have unequal performances.

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In the example shown, the compressor 3 has the lower power. It is via a three-way valve 9 can be connected to an intermediate / arm exchanger 1o.

The heat removal side of the intermediate heat exchanger can be connected via a line 11 to a water heater, not shown.

Furthermore, the heat output side is the intermediate heat exchanger 1o via a lockable® line 12 and ^ a line 13 that is free at any time is connected to the return β of the heating circuit.

In the positive direction of the return 6 opens the anytime Free line 13 in front of a throttle valve 14 “The lockable line 12, however, is behind the Throttle valve 14 connected to the return β.

A drive for the throttle valve 14 and a drive for a shut-off line 12 that can be shut off

provided valve 16 are connected to a flow monitor 17 arranged in the line 11 to the water heater so that when a hot water request is indicated by the flow monitor 17, the valve 16 is closed and the throttle valve 14 is opened. In the rest of the operation, however, the circuit is such that valve 16 is open and throttle valve 14 performs its throttling function »

A check valve 18 prevents reaction of compressor 2 to compressor 3 =

Working method:

In heating mode, both compressors 2, 3 work when there is a large heat demand. The three-way valve 9 blocks

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while the way to the intermediate heat exchanger 1o, so that all the heat obtained in the evaporator 8 dem Condenser 4 is supplied, which emits the useful heat to the heating circuit. Here is the valve 16 open and the throttle valve 14 adjusted so that it performs its throttling function. The current runs in the heating circuit, as a result of the throttle position of the throttle valve 14, from the return 6 Via the line 13, which is free at all times, to the intermediate heat exchanger 1o and from there through the lockable Line 12 to condenser 4 and from this to flow 5.

If the heat requirement is lower, depending on the size of the requirement, useful heat obtained either only via compressor 2 or only via compressor 3. the The flow of the heating circuit is unchanged.

If, on the other hand, hot water is supplied via the flow monitor 17 requested, the valve 16 closes and the throttle valve 14 is opened.

The heating circuit now flows from return 6 partly to condenser 4 and partly through the line 13 that is free at all times to the intermediate heat exchanger 1o. Regardless of whether compressor 2 with the higher output provides heating output or not, the compressor 3 operates with the smaller one Power only, through the appropriate position of the three-way valve 9, on the intermediate heat exchanger 1o.

Cold water can also be fed to the intermediate heat exchanger 1o via a fresh water line 19.

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Even if the heating circuit is disconnected for whatever reason, warm water can still be generated in any case by the inflow of cold water alone.
5

In the example shown, the line 13 that is free at all times and the fresh water line 19 are at least located close together over part of their length. Through this training, management can be free at any time 13 heat can be transferred to the fresh water pipe. That flowing into the intermediate heat exchanger 1o Fresh water can be preheated in this way, which also has a positive effect on the performance figure of the Heat pump affects.

2 claims
1 figure

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Claims (2)

-Jg- VPA 81 P B 5 2 3 DE Patent Claims 1J Heat pump system with the features of the refrigerant circuit (1) of the heat pump has two compressors (2, 3) arranged in parallel, which can optionally be switched on together and individually » 1.2 in the refrigerant circuit (1) of the heat pump, there is also a capacitor (4), which is in heat exchange with a a lead (5) and a <* · return pipe (6) having Helzungakreislauf, 1.3 the refrigerant circuit (1) of the heat pump has also an expansion device (7) and an evaporator (8), characterized by the features: 1.4 the compressors (2,3) are of unequal size © Services, 1.5 the compressor (3) with the lower performance can be connected to an intermediate heat exchanger (1o) via a three-way valve, 1.6 the heat consumption side of the intermediate @ nwärra @ exchanger (1o) can be connected to a water heater, 1.7 the heat consumption side of the Zwlselienv / ärmetausehers (1o) is via a lockable line (12) and A line (13) that is free at all times is connected to the return (6) of the heating circuit © ®, 1.8 in the direction of flow d @ s return (6) opens the free line at any time (13) in front of © inaaa Drosselven « til (14) and the ebsperrbar © L @ itymg (12) behind the throttle valve (14) in the © return line (6) the heating circuit, 1.9 a drive for the throttle valve (14) and a drive for a line that can be sporulated to shut off the valve (12) serving valve (16) si »d with one in the Line (11) arranged to the water heater 3o - T - VPA 81 P 8 5 2 3 DE Flow monitor (17) switched so that valve (16) closes when hot water is required and the throttle valve (14) is open and, in the rest of the operation, the valve (16) and the throttle valve are opened (14) is closed. 2. Heat pump system according to claim 1, characterized characterized in that the line (13) which is free at any time in heat exchange with a for Intermediate heat exchanger (1o) guided fresh water line (19) stands.