Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B30/00—Heat pumps
  • F25B30/02—Heat pumps of the compression type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
  • F24D17/00—Domestic hot-water supply systems
  • F24D17/02—Domestic hot-water supply systems using heat pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
  • F24D19/00—Details
  • F24D19/10—Arrangement or mounting of control or safety devices
  • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
  • F24D19/1051—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water
  • F24D19/1054—Arrangement or mounting of control or safety devices for water heating systems for domestic hot water the system uses a heat pump
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B40/00—Subcoolers, desuperheaters or superheaters
  • F25B40/04—Desuperheaters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B49/00—Arrangement or mounting of control or safety devices
  • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
  • F25B49/027—Condenser control arrangements
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B49/00—Arrangement or mounting of control or safety devices
  • F25B49/005—Arrangement or mounting of control or safety devices of safety devices

Definitions

• the present invention relates to a heat pump system as defined in the preamble of claim 1.
• Known heat pump systems particularly ground source heat pump systems commonly employ following basic components: a compressor, a condenser, an expansion valve, an evaporator, a circulating pump of the ground heat collection circle, a circulating pump of the heating system circuit, thermostatic switches and pressure switches of the refrigerant circuit and other auxiliaries for the same such as a refrigerant accumulator, a filter, an inspection glass, a magnetic valve, and a controller of the compressor.
• a common solution is to underdimension the heat pump and to produce additional heating power with an electric resistance element when required.
• the unit will work with its best COP the outdoor temperature being within the range of -10°C ... 0°C, i.e. approx. half of its annual working hours in Scandinavian varying weather conditions. Need for additional electric heating increases with the outdoor temperature falling below -10°C and the total COP of the heating system will then drastically drop. The outdoor temperature being warmer than 0°C heating is still required but the heat pump is then overdimensioned for such warmer weather conditions and will again work with less good COP, which will further drop with rising outdoor temperature.
• An object of the present invention is to provide a heat pump system from which such disadvantages as mentioned above are removed and that is capable of producing both the domestic hot water and the heating energy with good efficiency in all weather conditions.
• a ground source heat pump in which the temperature of the heating circuit liquid is adjusted by changing its flowing speed in the condenser, which method improves efficiency of the condenser and enhances COP of the system.
• a ground source heat pump in which a sub-cooling heat exchanger is installed after the condenser to sub- cool the refrigerant to the incoming ground source liquid, which improves the efficiency of the function of the evaporator and enhances COP of the system.
• a ground source heat pump in which the domestic hot water is produced in two phases: In the first phase water is preheated with the heat absorbed from the condenser. A super-heat exchanger is provided to heat the domestic hot water to its final high tempera- ture in the second phase. The super-heat exchanger is connected with a heat accumulator via a tube called flowing tube. This flowing tube is used for controlling the position of the condensing point of the refrigerant vapor and to remove excessive super-heat to the heat accumulator. This method improves functioning of the condenser and the COP of the system while domes- tic hot water is produced.
• the heat pump system according to the invention is characterized by what is presented in the characterization part of claim 1.
• Other embodiments of the invention are characterized by what is presented in the other claims.
• the advantages of the present invention are better efficiency of the condenser and evaporator, and also enhancements concerning the COP of the system .
• the present invention will be described in detail by the aid of an example embodiment with reference to the attached drawing, wherein
• Fig. 1 presents a schematic diagram of the ground source heat pump utilizing the improvements of the present invention
• Fig. 2 is a schematic representation of the super-heat exchanger employed in the improved ground source heat pump
• Fig. 3 presents an alternative design of the super-heat exchanger, in which it is integrated with the heat accumulator and
• Fig. 4 is a schematic diagram of the improved ground source heat pump with a manifold according to US. PAT. 6, 092, 734 installed.
• the basic components of a ground source heat pump are: a compressor 1 , a condenser 6, an expansion valve12, an evaporator 13, a circulating pump 14 of the ground heat collection circle, a circulating pump 5 of the heating system circuit, thermostatic switches 16 and pressure switches 17 of the refrigerant circuit 19 and other auxiliaries for the same such as a refrigerant accumulator 8, a filter 9, an inspection glass 11 , a magnetic valve 10, and a controller of the compressor.
• the present invention relates to a ground source heat pump which is characterised in that the flowing speed of the liquid in the heating circuit 18 is regulated while flowing through the condenser 6, the refrigerant flowing in the ground source heat pump is sub-cooled to the incoming ground circuit liquid 7 after the condenser 6, and the position of the condensing point of the refrigerant vapor is adjusted by means of the flowing tube 3, which connects the super-heat exchanger 2 and the heat accumulator 4.
• a ground source heat pump is provided, in which the temperature of the heating circuit liquid entering the heating circuit 18 from the condenser 6 is adjusted by changing its flowing speed in the condenser. If the flowing speed of the heating circuit liquid is increased in the condenser 6, it will leave the condenser and enter the heating circuit in a lower temperature as the faster flowing liquid will have had shorter time to absorb heat. The quantity of the delivered energy , however, will increase and consequently the temperature of the condenser 6 and the temperature of the refrigerant leaving the condenser will become lower.
• This method will essentially improve the COP of the ground source heat pump, if this is connected with a heating system that is build in accordance with the US. PAT. 6, 092, 734, in which heat is fed into the heating circuit by fits and starts and which system allows decreasing of the temperature of the heating circuit liquid by increasing its flowing speed.
• a ground source heat pump in which also a sub-cooling heat exchanger 15 is employed for cooling the refrigerant to the ground source liquid 7 after the condenser 6.
• This arrangement will bring following advantages: the refrigerant will enter and pass the expansion valve 12 in an essentially lower temperature, causing a bigger refrigerant mass to pass the valve, which will increase heat absorption capacity in the evaporator 13. Simultaneously the ground source liquid 7 comes to the evaporator 13 in an increased temperature.
• the increased difference of the refrigerant and the ground source liquid temperatures will improve the heat exchange in the evaporator 13, in which heat is absorbed from the ground source liquid to the refrigerant.
• Another advantage is that expansion vapor bubbles, which are harmful for the function of the evaporator, are the less the cooler the refrigerant enters the expansion valve.
• the present invention provides a ground source heat pump, in which the domestic hot water is produced in two phases with the following method:
• the present invention provides a ground source heat pump being also characterised in that it includes a super- heat exchanger 2 which consists of two copper tubes, these being installed one within the other, and a domestic hot water tank 2.2 through which the said copper tubes are lead.
• the super-heated refrigerant vapor flows in the inner tube 2.3.
• the heating circuit liquid flows in the outer tube i.e.
• the invention makes possible to control the position of the condensing point of the refrigerant even in such a case when domestic hot water was not used for a longer period and consequently temperature in the super-heat exchanger 2 would rise near its maximum value.
• overheat is lead from the super-heat exchanger 2 to the heat accumulator 4 with the heating circuit liquid by using the flowing tube 3 and the channel between the outer and inner copper tubes of the super-heat exchanger.
• the pressure of approx. 18 bar in the refrigerant circuit 19 or the compressor circuit is provided by a compressor 1.
• the refrigerant flowing through it under the pressure of the refrigerant circuit 19 will override the 1 bar pressure of the heating circuit 18 and consequently the refrigerant will brake out through the safety valve (1 ,5 bar) and can not get mixed with the domestic hot water which is under the pressure of 2...3 bar.
• the system is therefore safe and the refrigerant can not get mixed with the drinking water.
• the super-heat exchanger can also be integrated with the heat accumulator to be one larger unit, the super-heat exchanger forming its upper part being separated with a wall from the heat accumulator.
• the flowing tube 3 can be installed outside of the tank. This kind of an alternative structure has been presented in Fig. 3.
• the super-heat exchanger can be constructed in many different ways with the only condition that it includes the flowing tube 3 which makes possible to control the position of the condensing point of the refrigerant.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Heat-Pump Type And Storage Water Heaters (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8563401

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (4)

Family Cites Families (8)

• 2002
  • 2002-03-04 FI FI20020407A patent/FI117024B/fi active IP Right Grant
• 2003
  • 2003-03-04 AU AU2003208369A patent/AU2003208369A1/en not_active Abandoned
  • 2003-03-04 WO PCT/FI2003/000158 patent/WO2003074953A1/en not_active Application Discontinuation
  • 2003-03-04 EP EP03706656A patent/EP1490636A1/de not_active Withdrawn

Non-Patent Citations (1)

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