DE29521370U1 - Heating and cooling device with heat pump - Google Patents

Description

Heating and cooling device with heat pump

The invention relates to the coupled operation of commercial refrigeration systems and heat pumps for markets, butcher shops, bakeries, hospitals, hotels, etc., whereby a storage facility located underground is provided to reduce the energy expenditure.

Heat engines are known in which condensers and evaporators already located in the ground are used with an exclusive storage function for the discharged heat.

DE 29 52 758 A1 describes a system for air conditioning a building with or without a heat pump, in which an internal heat exchanger (in the interior walls of the building) is connected to the condenser side and the two external heat exchangers are connected to the steam evaporator side of the heat pump.

The subject of DE 30 24 016 Al is a heat engine arrangement, in which essentially radiant heat is stored in the ground using the greenhouse effect. With this solution, the heat released into the ground by the exhaust steam of the heat engine can be stored in the surrounding ground for a limited time. In periods of low air heat or solar radiation, the heat stored in the ground is extracted from the ground again via the condenser section located in the ground.

The object of the invention is to provide heat pump, refrigeration system

and ground storage in such a way that the heat pump and the cooling system can be operated both individually and as part of the overall system with good efficiency.

An inventive solution to this problem is specified in claim 1. Further developments of the invention are characterized in the subclaims.

According to the invention, the soil with a storage circuit installed in the soil is integrated into the overall system of heat pump and useful cooling system in such a way that the heat pump and useful cooling system complement each other in the interconnection described in claim 1 to achieve an energetically favorable overall operation, whereby both nevertheless function perfectly independently of each other.

The characteristic feature and the associated main advantage of the heating and cooling device according to the invention is that the useful refrigeration system liquefies at a lower condensation temperature te compared to known systems.

This is made possible by the temperature level of the condensation section, which is determined by the temperature of the ground, whereby the ground temperature, even at a small depth, only shows relatively small fluctuations over the course of the year.

Based on this low and largely constant condensation temperature t _{c ,} the commercial refrigeration system can be equipped with a smaller compressor, thereby minimizing acquisition costs and energy consumption.

The intermediate medium used to supply the underground pipe system allows for

ring refrigerant charges.

The heating and cooling device according to the invention can be constructed from any number of heat pumps and commercial refrigeration systems.

The invention is described below without limiting the general inventive concept using an embodiment example with reference to the drawing, to which reference is expressly made with regard to the disclosure of all details of the invention not explained in more detail in the text.

Fig. 1 shows the schematic representation of the heating and cooling device according to the invention with the utility refrigeration system 20 and heat pump 21 connected via the soil storage circuit 16, 17, the check valves 22, 23 and the media pumps 8, 9.

The heat pump 21 consists of the series connection of heat exchanger 1, which functions as a transfer point in the heat generation circuit with heat output 18, the compressor in the heat generation circuit 2, the collector 3, the filter 4, a solenoid valve 5 and a control valve 6 as well as the heat exchanger 7, which works as a damper and serves as a heat extraction point.

When heating is required, the heated carrier medium is transported by the pump 8 into the heat exchanger 7 of the heat pump 21. This increases the evaporation temperature to of the heat pump 21 and thus significantly improves the efficiency.

If there is no heat demand from the heat generator circuit 21, the pump 8 is not in operation and the carrier medium flows via the check valve 23 and charges the underground storage tank 16, 17.

If the heat pump 21 is requested, the pump 8 draws the carrier medium via the check valve 22 and discharges the storage tank.

The utility refrigeration system 20 has an analogous structure: a compressor in the refrigeration circuit 10, a heat exchanger 19, which works as a condenser or condenser of the utility refrigeration system 20, the collector 11, the filter 12, solenoid valve 13 and control valve 14 as well as the evaporator 15 as an example of a cooling section.

In a compression refrigeration system, the energy consumption increases when the condensation temperature t _c increases. In a heat pump, the efficiency improves when the evaporation temperature to increases. The soil 16 is charged as a natural heat storage facility via the storage circuit 17 by the useful refrigeration system 20. Due to the relatively constant temperatures in the soil, the condensation temperature t _c of the useful refrigeration system 20 remains low.

The pump 8 transports the medium preheated by the circuit of the useful refrigeration system 20 into the heat pump circuit and increases the evaporation temperature t ₀ there.

When the inventive utility refrigeration system 20 is operating, the pump 9 feeds the condenser 19, the condensation temperature te being the reference variable maintained by the pump 9; the compressor 10 is dimensioned accordingly.

According to the main advantage of the invention, the utility refrigeration system 20 liquefies at a low condensation temperature te of approx. 15°C, whereas previously at

conventional systems required a condensation temperature of approximately 4O ⁰ C.

As a result, due to the smaller temperature difference, the same cooling capacity is generated with a lower electrical power of the compressor 10. For example, when using the design of the useful refrigeration system according to the invention, a drive power of the compressor 10 of 40 kW or 10 kW (for a refrigeration system
conventional design) to 23.3 KW or 5.8 kW
become.

List of reference symbols

1 heat exchanger, transfer point as heat generator

2 compressors in the heat generator circuit

3 collectors

4 Filter

5 Solenoid valve

6 Control valve

7 Evaporator (heat extraction point)

8 Media pump (heat generator)

9 Media pump (refrigeration system)

10 Compressor refrigeration circuit

11 collectors

12 filters

13 Solenoid valve

14 Control valve

15 evaporators

16 Soil

17 Soil storage circuit

18 Heat emission

19 Condenser of the utility refrigeration system

20 Utility cooling system

21 Heat pump

22 Check valve

23 Check valve

Claims (5)

Protection claims 1. Heating and cooling device with heat pump consisting of at least two closed circuits of a working medium coupled in the overall system, whereby in the 1st circuit, the heat generator or heat pump circuit (21), at least one heat exchanger (1) for heat dissipation (18), a compressor (2), collector (3), filter (4), valves (5, 6) and evaporator (7) are present as heat extraction points and the 2nd circuit, the cooling circuit (20), includes at least one compressor (10) for the cooling circuit, a condenser (19), a collector (11), a filter (12), valves (13, 14) and an evaporator (15) and the secondary circuit of the evaporator (7) in the heat generator circuit (21) and of the condenser (19) of the refrigeration system (20) are connected to a storage circuit (17) located in the ground (16) with a heat exchanger function by connecting a media pump (8, 9) for the heat generator (21) or for the refrigeration system (20), and a first check valve (23) ensures the loading of the ground storage (16, 17) and a second check valve (22) ensures the final loading of the ground storage (16, 17). 2. Heating and cooling device with heat pump according to claim characterized in that the storage circuit (17) is installed horizontally and/or vertically in the ground (16) in the vicinity of the building housing the heat pump system. 3. Heating and cooling device with heat pump according to claim 2, characterized in that the E-storage unit (17) consists of a closed tube system which is laid as an earth absorber preferably below the frost line in the ground. 4. Heating and cooling device with heat pump according to claim 3, characterized in that plastic pipes filled with a frost-resistant liquid are provided for the pipe system (17). 5. Heating and cooling device with heat pump according to one of claims 1 to 4, characterized in that any number of useful refrigeration systems (20) and heat pumps (21) can be coupled.