DE202019101161U1 - Device for increasing a source temperature of a source of a heat pump and heat pump system with device - Google Patents

Abstract

A device (10) for increasing a source temperature of a source (51) of a heat pump (70) having a heating circuit (60) and a source circuit (50) connected to the source (51), the device (10) comprising:
(a) a first heat exchanger (20) adapted to be disposed between the heating circuit (60) and the source circuit (50),
(b) a second heat exchanger (30) arranged to be disposed between the heating circuit (60) and the source circuit (50), and
(c) a control system (40) connected to the first heat exchanger (20) and the second heat exchanger (30) and adapted to be connected to the heat pump (70), to an auxiliary electric heater (71) of the heat pump (70), wherein the control system (40) comprises:
(I) a first control function for transferring heat via the first heat exchanger (20) from the heating circuit (60) in the source circuit (50) and
(ii) a second control function for switching on the auxiliary electric heater (71) and transmitting the heat generated thereby via the second heat exchanger (30) from the heating circuit (60) to the source circuit (50).

Description

The invention relates to a device for increasing a source temperature of a source of a heat pump with a heating circuit and a source circuit connected to the source and a heat pump system with a heat pump and such a device.

Heat pump systems are devices known in the art for utilizing the heat stored in the environment to heat a building. The sources of the environment are basically air, soil and groundwater. For example, if the soil is used as a source, a so-called source circuit of the heat pump system is arranged in the soil, which is connected to a heat pump, in particular a so-called brine-water heat pump, the heat pump system. The source circuit has pipelines introduced into the soil, through which a mixture of water and antifreeze, the so-called brine, circulates. The brine absorbs the heat of the earth and transports it to the heat pump. The pipelines can be arranged in the soil, for example in the form of deep holes or flat plates. The source circuit of the heat pump system has a source circuit feed and a source circuit return. In the source circuit feed, the heat extracted from the soil is transported to the heat pump, where it is passed to a heating circuit for the release of heat in a building via, for example, a heater. In the source circuit return, the brine, which has given off its heat, is led back into the ground, where it absorbs further heat and uses it to heat the building.

Heat pump systems known in the art can not be operated as efficiently as would be desirable.

From the DE 10 2014 008 836 A1 For example, a method and device for operating a heat pump with heat pump are known with which the efficiency of heat pump systems can be increased.

The invention has for its object to further improve the efficiency of a heat pump system.

The above object is achieved by a device for increasing a source temperature of a source of a heat pump with a heating circuit and a source circuit connected to the source according to claim 1 and a heat pump system according to claim 12. In this case, features which are described in connection with the device according to the invention also apply in connection with the heat pump system according to the invention, so that reciprocal reference can be made with regard to possible combinations of individual inventive aspects.

According to a first aspect, the invention achieves the object by a device for increasing a source temperature of a source of a heat pump having a heating circuit and a source circuit connected to the source, the device comprising: (a) a first heat exchanger, which is arranged between the (B) a second heat exchanger adapted to be placed between the heating circuit and the source circuit, and (c) a control system connected to the first heat exchanger and the second heat exchanger, and thereto is arranged to be connected to the heat pump to control an electric auxiliary heating of the heat pump, wherein the control system comprises: (i) a first control function for transferring heat via the first heat exchanger from the heating circuit in the source circuit and (ii) a second Control function for switching on the additional electric heater and transfer agen the heat generated thereby via the second heat exchanger from the heating circuit in the source circuit.

The device according to the invention can remove a quantity of heat to be determined from the heating circuit by means of the first heat exchanger and the first control function and direct it to the source circuit in order to increase the temperature of the source. By a, in particular by means of a controllable circulating pump, limited supply of heat, the annual work rate can be increased as the efficiency of the heat pump.

The device according to the invention can furthermore, by means of the additional heater installed in the heat pump in particular, which can be formed for example by electric heating rods, transform the current into heat with the second heat exchanger and the second control function, which can be supplied to the source circuit in order to increase the efficiency to increase the heat pump.

The control system may comprise at least one processor and at least one memory in which the control functions are stored. The processor may be configured to perform the control functions.

In particular, the device is set up not to intervene in a regulation of a heat pump in normal operation. Normal operation A heat pump is characterized by charging processes for heating and domestic water heating.

In an advantageous embodiment of the invention, the control system is adapted to be connected to a first temperature sensor in a source circuit flow of the source circuit and / or a second temperature sensor in a source circuit return of the source circuit. In addition, the control system may be configured to communicate with the first temperature sensor and / or the second temperature sensor. As a result, the temperature spread in the source circuit can be determined. The control system may be arranged to take into account the determined temperature spread in the source circuit in the first control function and / or the second control function to the provided for a limited withdrawal amount of heat according to the first control function and / or the auxiliary heating amount of electricity supplied according to to regulate the second control function.

In a further advantageous embodiment of the invention, the control system has a third control function for determining a setpoint temperature of the source circuit return on the basis of a measured temperature in the source circuit flow and a measured temperature in the source circuit return. The control system may be configured to adjust the setpoint temperature of the source loop return and / or the source loop flow by performing the first control function and / or performing the second control function. In other words, the control system can regulate the first heat exchanger and / or the second heat exchanger on the basis of the calculated setpoint temperature of the source circuit return and thus influence the source circuit flow. To determine the setpoint temperature of the source circuit return and / or the source circuit flow, a parameter determined by the control system can, for example, be used as a parameter.

In a still further advantageous embodiment of the invention, the control system has a fourth control function for regulating the setpoint temperature on the basis of a current electricity price, a temporary available electricity and / or an energy source of the electricity, for example only electricity from renewable energies. The current electricity price and the energy source, for example renewable energies, of the current are thus parameters that are used in determining the setpoint temperature or regulating the setpoint temperature. For example, in areas where electricity can be obtained cheaper at night than during the day, preferably the second control function can be performed so as to allow a more favorable operation of the heat pump system. For example, it is also possible to carry out the second control function only in the case of availability and / or only with electricity generated from renewable energies in order to increase the eco-balance of the heat pump.

In a further advantageous embodiment of the invention, the device in a start-up phase of the heat pump on a fifth control function for redirecting all heat from the heating circuit in the source circuit. The start-up phase may include a period of time from switching on the compressor to the time at which the temperature in the heating circuit flow of the heat pump by at least 1 degree, in particular by at least 2 degrees higher than the temperature in the heater. As a result, the temperature which is still insufficient during the start-up phase for heating the building is used to heat the source and thus the efficiency of the heat pump is increased.

In a further advantageous embodiment of the invention, the device has a circulation pump, which is connected to the first heat exchanger. The circulation pump allows a limitation of the amount of heat to be transferred.

In a further embodiment of the invention, the circulating pump is arranged in a second line, which is adapted to be connected to a heating circuit return of the heating circuit.

In a further preferred embodiment of the invention, the device has a sixth control function for operating at least one source pump in the source circuit and a heating circuit pump in the heating circuit after switching off the heat pump. In particular, a compressor of the heat pump, in a cascade all compressors of the heat pump, off. In particular, the circulation pump can also continue to be operated after switching off the heat pump by means of the six control function. As a result, an otherwise unused residual heat from the heating circuit can be used to heat the source to allow for a higher efficiency at a later operating time of the heat pump.

The device may comprise two separate modules, wherein a first module may comprise the first heat exchanger and the second heat exchanger and the second module may comprise the control system. The modules can function independently of each other.

In a further preferred embodiment, the first heat exchanger, the second heat exchanger and the control system are in a common Housing arranged. This creates a compact and easily replaceable assembly.

In a further preferred embodiment, the device is designed as a retrofit system for heat pump systems. This means, in particular, that the device is a self-contained system, which is adapted to be arranged on any heat pump.

In a further preferred embodiment, a power of the first heat exchanger is less than a power of the second heat exchanger. As a result, a particularly economical device is provided, since the first heat exchanger must be able to remove only small quantities of heat from the heating circuit, while larger amounts of heat can be conducted into the source with the second heat exchanger.

According to a second aspect, the invention achieves the object by a heat pump system with a heat pump and a device according to the invention for increasing a source temperature of a source of the heat pump, wherein the heat pump system connected to the heat pump or connectable source circuit with a source circuit return and a source circuit flow and a heating circuit connected to the heat pump and having a heating circuit return and a heating circuit flow, wherein the source circuit is connected to a source or is adapted to be connected to a source.

In a further preferred embodiment, the control system is connected to a first temperature sensor in the source circuit flow and / or a second temperature sensor in the source circuit return.

In yet another preferred embodiment, the first temperature sensor and / or the second temperature sensor can detect temperature changes of 0.5 K, in particular of 0.3 K and further, in particular of 0.1 K. Due to the accuracy in the detection of temperature changes, a high increase in the efficiency can be made possible by means of the first control function.

In a particularly advantageous embodiment of the invention, the source circuit is connected to an additional heat storage. In one embodiment of the heat pump as a brine / water heat pump, an additional heat storage can be arranged (in order to store heat with a higher temperature and can deliver it later if needed). In other embodiments of the heat pump such as an air / water heat pump, an additional heat storage must be arranged (so that the heat pump system not by transmission according to 3 or conversion according to 4 generated heat is lost unused). The heat stored in the additional heat storage heat, for example, in an air / water heat pump in cold night hours with low air temperature gradually supplied to the source circuit of the heat pump system and so increase the temperature in the source circuit of the heat pump and increase their efficiency. The storage of heat in the auxiliary heat storage and the subsequent discharge of this heat to the source circuit can be controlled by a seventh control function of the control system.

Also, the first control function and / or second control function may be adapted to direct the heat removed from the heating circuit in the additional heat storage and / or the source. By the additional heat storage efficient storage of heat can be provided.

Preferably, the heat pump is a brine-to-water heat pump. This is particularly advantageous for the execution of the second control function. Other embodiments of the heat pump are possible. In heat pump systems with a brine / water heat pump, the storage of the heat generated is done inexpensively in geothermal probes and in a surrounding soil without any additional effort. In other types, such as air / water or water / water heat pumps, the heat transferred to the source circuit must preferably be stored in an auxiliary heat accumulator connected thereto.

• 1 eine schematische Ansicht eines Ausführungsbeispiels einer erfindungsgemäßen Einrichtung und
• 2 eine schematische Ansicht eines Ausführungsbeispiels einer erfindungsgemäßen Wärmepumpenanlage in einer ersten Betriebsweise,
• 3 eine schematische Ansicht der erfindungsgemäßen Wärmepumpenanlage aus 2 in einer zweiten Betriebsweise, und
• 4 eine schematische Ansicht der erfindungsgemäßen Wärmepumpenanlage aus 2 in einer dritten Betriebsweise.

Reference to the accompanying drawings, the invention is explained in more detail below. Elements with the same function and / or mode of operation are each provided with the same reference numerals in the figures. Show it:

• 1 a schematic view of an embodiment of a device according to the invention and
• 2 1 is a schematic view of an embodiment of a heat pump system according to the invention in a first operating mode,
• 3 a schematic view of the heat pump system according to the invention 2 in a second mode of operation, and
• 4 a schematic view of the heat pump system according to the invention 2 in a third mode of operation.

The used for a particular mode of operation lines for the transport of heat shown in bold. Control circuits of the control system are shown dotted.

1 shows a schematic view of an embodiment of a device according to the invention 10 with a housing 11 , In the case 11 are a first module 12 and a second module 13 arranged. The first module 12 has a first heat exchanger 20 and a second heat exchanger 30 on. A circulation pump 22 is with the first heat exchanger 20 connected. The second module 13 has a rule system 40 with a processor 41 and a memory 42 on. In the store 42 are stored a first, second, third, fourth, fifth, sixth and seventh control function. The connection of the first heat exchanger 20 and the second heat exchanger 30 with the control system 40 is based 2 explained.

2 shows a schematic view of an embodiment of a heat pump system according to the invention 80 with a heat pump 70 and a facility 10 according to 1 , The first mode of operation corresponds to a normal operation of the heat pump system 80 without execution of the first or second control function of the control system 40 , Shown is the normal operation without heat transfer, it will only be the existing temperature values of source circuit flow 52 and source circuit return 54 to the added control system 40 transfer. About in the source circle 50 arranged temperature sensors 53 . 55 are constantly temperature values in a source circuit flow 52 and source circuit return 54 of the source circle 50 to the control system 40 transmitted via the dotted illustrated control loop. The control system 40 has a third control function for determining a setpoint temperature of the source circuit return 54 based on, in particular only, the measured temperature in the source circuit flow 52 and the measured temperature in the source circuit return 54 , If the setpoint value is undershot, the control system can 40 perform a seventh and / or a first and / or a second control function.

In 3 , Which is a schematic view of the heat pump system according to the invention 2 shows in a second mode of operation, the case is shown, in which a setpoint was exceeded and the control system 40 the first control function for transferring heat via the first heat exchanger 20 from the heating circuit 60 in the source circle 50 performs.

The heat pump system 80 has a source circle 50 on that with a source 51 is connected, which may be, for example, the soil. The source circle 50 is via a source circle lead 52 and a source circuit return 54 with the heat pump 70 connected, the additional heating 71 having. In the source circle lead 52 is a first temperature sensor 53 arranged and in the source circuit return 54 is a second temperature sensor 55 arranged. In the source circle lead 52 is also a source pump 56 arranged. In addition, in the source circle lead 52 a three-way valve 21 (in connection to the heat exchanger 20 ) and a three-way valve 34 (in connection to the heat exchanger 30 ) arranged.

The heat pump system 80 also has a heating circuit 60 up, with a heater 61 connected, which may be, for example, a floor heating in a building. The heating circuit 60 is via a heating circuit flow 62 and a heating circuit return 63 with the heat pump 70 connected. In the heating circuit supply 62 is also a heating circuit pump 64 arranged.

The first heat exchanger 20 is over the line 23 (with the three-way valve 21 ) and line 24 with the source forerun 52 connected. With the heating circuit supply 62 is the heat exchanger 20 over the line 25 connected, in which a circulating pump 22 is arranged, and over the line 26 with the heating circuit return 63 connected.

About the first heat exchanger 20 can heat out the heating circuit 60 taken and the source circle 50 be supplied, so that the efficiency of the heat pump system 80 can be increased. This can be done according to one in the memory 42 of the control system 40 stored first control function.

The process of transferring heat from the heating circuit flow 62 in the source circle 50 over the heat exchanger 20 will be terminated as soon as one of the control system 40 predetermined setpoint in the source circuit return 54 is reached.

In 4 , Which is a schematic view of the heat pump system according to the invention 2 in a third mode of operation, it can be seen how the regeneration of the source possible by means of the second control function 51 by converting electricity into heat. 4 thus shows the regeneration of the source 51 by transferring heat from the electric booster heater alone 71 the heat pump 70 is produced. The compressor of the heat pump 70 is out of service, source pump 56 and heating circuit pump 64 work as in normal operation. The control system 40 causes the switching on of the additional electric heater 71 , the conversion of the three-way valve 31 in the heating circuit 60 (this is the heating 61 from the heat pump 70 separated) and the switching of the three-way valve 34 in the source circle 50 (The heat can be from the medium of the source circuit 50 in the heat exchangers 30 taken and directly to the source 51 be directed). This is done by the rule system 40 the connection of the heat pump 70 integrated auxiliary electric heater causes (this is in particular the only possible access of the control system to the otherwise independent regulation of the heat pump 70 ).

The heat exchanger required for this purpose 30 is with the heating circuit 60 over the line 32 connected once the three-way valve 31 switches over and with it the heating 61 from a supply of heat from the heat pump 70 separates. The return of the heated water to the heat pump 70 via the line 33 and the heating circuit return 63 ,

The connection between the heat exchanger 30 and the source circle 50 is made by the three-way valve 34 in the source forerun 52 The administration 35 releases to the heat exchanger. The heat transferred in the heat exchanger is transferred via the line 36 to the source circle 50 and from there via the source circuit return 54 to the source 51 directed. This source 51 may be a ground probe system or a suitable additional heat storage for receiving this heat.

In the same way it is also possible to source 51 To regenerate by removing heat with even lower temperature from the heating circuit flow 62 the heat pump 70 during the start-up phase. This is done by means of a fifth control function of the control system 40 , The process is terminated as soon as the temperature in the heating circuit flow 62 a few degrees above the temperature in the heater 61 lies, the three-way valve 31 is then changed back to the heater.

Another way to regenerate the source 51 offers the use of residual heat from the entire heat pump system after switching off the compressor of the heat pump 70 completed charging for heating and domestic water heating. The procedure is similar to the procedure described above in the start-up phase, which is responsible for the sixth control function of the control system 40 , The process ends as soon as the plant has been deprived of usable heat.

A big advantage is the combination of all components for all functions in one compact unit. For the recovery of heat for the regeneration of the heat source so no additional effort that would be hardly worthwhile in the case of the relatively small amounts of heat in the use of heat in the start-up phase and after switching off the heat pump in most systems.

LIST OF REFERENCE NUMBERS

10

Facility

11

casing

12

first module

13

second module

20

first heat exchanger

21

Three-way valve

22

circulating pump

23

management

24

management

30

second heat exchanger

31

Three-way valve

32

management

33

management

34

Three-way valve

35

management

36

management

40

control system

41

processor

42

Storage

50

source circuit

51

source

52

Source circuit flow

53

first temperature sensor

54

Source circuit return

55

second temperature sensor

56

well pump

60

heating circuit

61

heater

62

Heating circuit flow

63

Heating circuit return

64

Heating circuit pump

70

heat pump

71

additional heating

80

heat pump system

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102014008836 A1 [0004]

Claims (17)

A device (10) for increasing a source temperature of a source (51) of a heat pump (70) having a heating circuit (60) and a source circuit (50) connected to the source (51), the device (10) comprising: (a) a first heat exchanger (20) adapted to be disposed between the heating circuit (60) and the source circuit (50), (b) a second heat exchanger (30) arranged to be disposed between the heating circuit (60) and the source circuit (50), and (c) a control system (40) connected to the first heat exchanger (20) and the second heat exchanger (30) and adapted to be connected to the heat pump (70), to an auxiliary electric heater (71) of the heat pump (70), wherein the control system (40) comprises: (I) a first control function for transferring heat via the first heat exchanger (20) from the heating circuit (60) in the source circuit (50) and (ii) a second control function for switching on the auxiliary electric heater (71) and transmitting the heat generated thereby via the second heat exchanger (30) from the heating circuit (60) to the source circuit (50). Device (10) after Claim 1 characterized in that the control system (40) is adapted to be coupled to a first temperature sensor (53) in a source circuit feed (52) of the source circuit (50) and / or a second temperature sensor (55) in a source circuit return (54 ) of the source circuit (50). Device (10) after Claim 2 characterized in that the control system (40) comprises a third control function for determining a setpoint temperature of the source circuit return (54) based on, in particular, only a measured temperature in the source circuit feed (52) and a measured temperature in the source circuit return (54 ) having. Device (10) after Claim 3 , characterized in that the control system (40) has a fourth control function for controlling the setpoint temperature on the basis of a current electricity price, a temporary available current and / or an energy carrier of the stream. Device (10) according to one of the preceding claims, characterized in that the device has a fifth control function for diverting all heat from the heating circuit (60) in a start-up phase of the heat pump (70) to the source circuit (50). Device (10) according to one of the preceding claims, characterized in that the device (10) has a circulation pump (22) in a first line (25) which is connected to the first heat exchanger (20). Device (10) after Claim 6 , characterized in that the circulation pump (22) is arranged in a second line (26) which is adapted to be connected to a heating circuit return (63) of the heating circuit (60). Device (10) according to one of the preceding claims, characterized in that the device (10) has a sixth control function for operating at least one source pump (56) in the source circuit (50) and a heating circuit pump (64) in the heating circuit (60) after one Turning off the heat pump (70). Device (10) according to one of the preceding claims, characterized in that the first heat exchanger (20), the second heat exchanger (30) and the control system (40) are arranged in a common housing (11). Device (10) according to one of the preceding claims, characterized in that the device (10) is designed as a retrofit system for heat pump systems (80). Device (10) according to one of the preceding claims, characterized in that a power of the first heat exchanger (20) is less than a power of the second heat exchanger (30). A heat pump system (80) comprising a heat pump (70) and means (10) for increasing a source temperature of a source (51) of the heat pump (70) of any one of the preceding claims, wherein the heat pump system (80) is connected to the heat pump (70) or connectable source circuit (50) having a source circuit return (54) and a source circuit flow (52) and a heating circuit (60) connected to the heat pump (70) and having a heating circuit return (63) and a heating circuit flow (62), wherein the source circuit (50) is connected to a source (51) or is adapted to be connected to a source (51). Heat pump system (80) after Claim 12 characterized in that the control system (40) is connected to a first temperature sensor (53) in the source circuit feed (52) and / or a second temperature sensor (55) in the source circuit return (54). Heat pump system (80) after Claim 13 , characterized in that the first temperature sensor (53) and / or the second Temperature sensor (55) can detect temperature changes of 0.5K. Heat pump system (80) according to one of Claims 12 to 14 , characterized in that the source circuit (50) is connected to an additional heat storage. Heat pump system (80) after Claim 15 characterized in that the means (10) comprises a seventh control function for storing heat in the auxiliary heat storage and subsequently delivering that heat to the source system (50). Heat pump system (80) according to one of Claims 12 to 16 , characterized in that the heat pump (70) is a brine-to-water heat pump.

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