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
  • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
  • F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
• • 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
  • F24D11/00—Central heating systems using heat accumulated in storage masses
  • F24D11/02—Central heating systems using heat accumulated in storage masses using heat pumps
  • F24D11/0214—Central heating systems using heat accumulated in storage masses using heat pumps water heating system
  • F24D11/0235—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy
  • F24D11/025—Central heating systems using heat accumulated in storage masses using heat pumps water heating system with recuperation of waste energy contained in waste water
• • 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
  • F25B30/06—Heat pumps characterised by the source of low potential heat
• • 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
  • F24D2200/00—Heat sources or energy sources
  • F24D2200/08—Electric heater
• • 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
  • F24D2200/00—Heat sources or energy sources
  • F24D2200/11—Geothermal energy
• • 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
  • F24D2200/00—Heat sources or energy sources
  • F24D2200/12—Heat pump
• • 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
  • F24D2200/00—Heat sources or energy sources
  • F24D2200/16—Waste heat
  • F24D2200/20—Sewage water
• • 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
  • F24D3/00—Hot-water central heating systems
  • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
• • 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
  • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
  • F25B2400/24—Storage receiver heat
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
  • F28D20/0039—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material with stratification of the heat storage material
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
  • F28D20/021—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material and the heat-exchanging means being enclosed in one container
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
  • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
  • F28D2020/0065—Details, e.g. particular heat storage tanks, auxiliary members within tanks
  • F28D2020/0082—Multiple tanks arrangements, e.g. adjacent tanks, tank in tank
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B10/00—Integration of renewable energy sources in buildings
  • Y02B10/40—Geothermal heat-pumps
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B10/00—Integration of renewable energy sources in buildings
  • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
  • Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

Definitions

• the present invention regards a system for utilization of thermal energy from renewable resources and/or energy recovery, comprising thermal storage of hot water and/or cold water and/or ice in accordance with the preamble of the following Claim 1.
• the invention also regards a system and a method of providing cooling in accordance with the preamble of Claims 11 and 12, respectively, and also a method of storing thermal energy in accordance with the preamble of the following Claim 13.
• DE 2815974 describes a system in which a heat pump is used both to provide cooling for a cooling unit and heat for a hot water tank.
• the coolant flow to the heat pump passes through an evaporator in the cooling unit, and then through a condenser in the hot water tank. This will allow the heat absorbed by the coolant in the evaporator to be transferred to the hot water in the hot water tank.
• NO 313062 by the same applicant, describes a hot water tank connected with a heat exchanger. Water circulates from the lower part of the tank, through the heat exchanger, and returns to the tank a small distance above the outlet. This heats the water up to a temperature of about 40 0 C. This water is heated further by an electric heating coil, and circulates in the middle section of the tank, where there is provided a heat exchanger that extracts heat for heating the building. In the upper section of the tank there is provided an additional electric heating coil, which heats the water in this area to a temperature sufficient for water that is to be consumed.
• JP 2003056905 describes a system for producing both hot domestic water and water for heating.
• the system makes use of a heat pump and a storage tank for hot water. This tank communicates with an auxiliary tank, supplying this auxiliary tank with hot water. From the auxiliary tank, hot water can circulate to an underfloor heating system.
• Heat pumps depend on an accumulator or buffer tank to achieve smooth operation. To ensure an adequate lifetime for the compressor and the best possible efficiency, the temperature difference between the coolant/heating medium and the water in the tank should be as small as possible. The new CO 2 heat pumps make this even more important, as the temperature difference between incoming and outgoing water is of crucial importance to the operating results.
• EP 1248055 describes the use of energy from three different sources; ambient air, terrestrial heat and solar heat.
• the system consists of several circuits.
• a first circuit is connected to an air collector and a solar absorber.
• the use of valves allows the user to decide how much heat to draw from each energy source. The decision is based on temperature measurements in the circuit.
• the first circuit has a heat exchange relationship with a second circuit.
• the second circuit includes a burner.
• the second circuit has heat exchange relationships with a secondary circuit, both directly via a heat exchanger and indirectly via a condenser circuit.
• the secondary circuit includes a hot water tank. The choice of energy source in accordance with this publication is based solely on temperature measurements.
• DK 136497 describes a heat pump tied in to a boiler.
• the superheated gas from the compressor is directed to a heat exchanger.
• the heat exchanger is a water-filled tank with a pipe coil.
• the gas then passes to a heat exchanger in the boiler, after which the gas is liquefied.
• the liquid is passed via various components to a heat exchanger in the heat pump.
• NO 135444 illustrates a heat pump installation much like the previous publication.
• the superheated gas is also first cooled in a first condenser.
• the rest of the heat is liberated in a second condenser.
• a system for utilization of renewable energy resources is achieved by a unit comprising at least two thermally insulated tanks for thermal storage of hot water and/or cold water, which tanks are also thermally insulated from each other, that the first tank has a heat exchange relationship with a superheat circuit in the heat pump for heating water in the tank to a first high temperature level, that the second tank has a heat exchange relationship with a second circuit in the heat pump arranged to heat water in the second tank to a second temperature level lower than the first temperature level, or to cool down or freeze water in the second tank.
• the first tank may be used for heating and storage of hot domestic water, which must be at a temperature of at least 6O 0 C, preferably around 80 0 C.
• the second tank may be used for heating or cooling of water for other purposes, e.g. for supplying a domestic heating or cooling plant, or for producing chilled drinking water.
• the first tank will, in a first operating mode, be used to preheat the water going to the second tank, and in a second operating mode the first tank will be used to provide cooling, while the second tank is used for heating of hot domestic water.
• Arranging the heat exchanger of the first tank to receive hot or cold liquid from the heat pump and further connecting the heat exchanger to a heating/cooling system for heating or cooling of a building, provides an efficient system for distribution of heating/cooling.
• Placing the first and second tanks within a common jacket provides a compact unit that contains all central functions.
• system comprises an outlet between the first and the second tank for drawing off water, especially for drawing off chilled water. This makes it possible to provide cold drinking water in an energy-saving manner.
• system comprises a heat exchanger for heat transfer from waste water to the external circuit of the heat pump.
• a method of providing cooling by placing a secondary circuit of a heat pump in a heat exchange relationship with a tank containing liquid such as water, and by in a first phase cooling the liquid and/or freezing it, so as to form a cooling reservoir, and by in a second phase placing the liquid and/or ice in a heat exchange relationship with a circuit that brings cooling to a building or another location that requires cooling.
• cold can be stored, for instance during periods of low energy consumption or low energy prices, and then consumed during periods of high energy consumption or high energy prices.
• a method of storing thermal energy by use of a heat pump by arranging a waste water heat exchanger in the external circuit of a heat pump and transporting the heat transferred from the waste water to the cooling/heating medium of the heat pump down into a borehole for storage of thermal energy in the ground surrounding the borehole. This allows utilization of heat which would otherwise go to waste.
• the present invention comprises a split heating/cooling buffer or accumulator tank.
• This will hereinafter be termed a multi centre.
• the multi centre is required in order to achieve the optimum operating efficiency for a heat pump.
• the heat pump can extract heat from air or water and transfer this to water.
• the multi centre is arranged to supply heat and hot water, possibly cooling and hot water, to the building, a house or industrial building, by the room thermostat automatically calling for heat or cold from the heat pump. In the cooling position, the multi centre can also supply chilled drinking water.
• FIG. 1 schematically illustrates the principles of the system according to the present invention
• FIG 2 shows details of the heat pump in Figure 1
• Figure 3 shows a combined system for heating, cooling and heat recovery from waste water according to an alternative embodiment of the invention.
• FIG 4 shows yet another embodiment of the invention, in which heat from waste water is recovered via the primary circuit of the heat pump.
• Figure 5 shows a diagram of the air temperature and the borehole temperature in the course of a year
• Figure 6 shows a Mollier diagram for a heat pump.
• Figure 1 schematically illustrates a heat storage system according to the invention, comprising a multi centre or multifunctional unit 1 that includes a water heater and a heat pump 2.
• the multi centre has two tanks; and upper tank 3 and a lower tank 4.
• the tanks 3 and 4 are insulated against both the environment and each other.
• Cold water is supplied to the lower part of the lower tank 4 through a cold water inlet 5. From the upper part of the lower tank 4, water may flow on to the lower part of the upper tank 3 via a transfer passage 6. From the passage 6 there extends a branch 7 equipped with a stop valve 8 for drawing off chilled drinking water, as will be explained in greater detail below. There is also a passage 22 connecting the upper tank 3 with the cold water supply.
• each tank 3 and 4 there is provided a heat exchanger 10 and 11, respectively.
• the lower heat exchanger is connected to the heat pump 2 via an upper inlet 12 and to an underfloor heating pipe 14 via a lower outlet 13.
• So-called fan coils 21 may also be used for heating or cooling of the building, as an addition to or replacement for underfloor heating pipes 14.
• the heat exchanger is an air-to-liquid heat exchanger. It can be configured to recover heat from exhaust air leaving the building.
• the upper heat exchanger 11 is connected to the heat pump 2 via an upper inlet 15 and a lower outlet 16.
• the multi centre 1 is also provided with an electric heating coil 19, 20 in each tank. These may act as a supplemental energy supply or as back-up heating if the heat pump fails.
• FIG. 2 shows the principles of a heat pump according to the present invention.
• the circuit that includes underfloor heating and fan coils has been omitted from this figure but may obviously be present.
• the heat pump 2 includes secondary circuits.
• the first circuit is a superheat circuit comprising a unit 17 that extracts a quantity of energy from hot steam, lowering the temperature of this. From this unit, water (or optionally another suitable liquid that can transport thermal energy) circulates through the heat exchanger 11.
• the second circuit is a heating circuit that comprises a condenser 18, in which the steam condenses. From here, water circulates through the heat exchanger 10.
• the heat pump further comprises a compressor 22 that compresses hot steam. It further comprises an evaporator 23 that extracts thermal energy from either a borehole 35 or air (represented by arrow 24).
• the heat pump comprises two primary circuits; a first primary circuit arranged to extract thermal energy from air and a second primary circuit arranged to extract thermal energy from the ground or possibly water.
• a control device is connected to the heat pump; this device determines which of the two primary circuits is to supply energy to the secondary circuits, based on temperature measurements from the ground/water and the air.
• the multi centre 1 has a lower rustproof pressure vessel or pressure tank 4 with a rustproof heat exchanger 10, which either preheats the cold water or cools it down, depending on the setting of the heat pump 2. From the heat exchanger 10, the circuit continues to the underfloor heating pipes 14 (or convectors) for heating or cooling requirements. In the cooling position, the draw-off 8 also provides chilled drinking water.
• the upper pressure tank 3 with the reheating exchanger 11 from the superheat circuit 17 of the heat pump provides hot water at a temperature that is high enough to make electric reheating unnecessary.
• both heat and hot domestic water or cooling and hot domestic water can be accumulated in the multi centre.
• cold water at a temperature of approximately 10 0 C will flow in through the cold water inlet 5 from the water supply grid.
• Water at a temperature of about 48 0 C from the heat pump condenser 18 is circulated through the heat exchanger 10, heating the cold water in the lower tank 4 to a temperature of approximately 45 0 C.
• the water from the heat pump 2 is circulated further out of the heat exchanger 10 to an underfloor heating pipe 14.
• the heating medium now holds a temperature of between 25 and 35 0 C, which is an ideal temperature range for underfloor heating.
• a conventional temperature controller and a thermostat connected to the underfloor heating pipe, allowing the temperature of the building to be adjusted and set to the desired temperature.
• the heating medium returns to the heat pump and is reheated to approximately 48 0 C.
• the water in the lower tank 4 will flow as preheated cold water through the transfer passage 6 and into the upper tank 3.
• the water will be reheated by the heat exchanger 11.
• the heat exchanger is supplied with water at a temperature of approximately 90 0 C from the superheat circuit 17 of the heat pump 2.
• hot domestic water can be drawn off through the hot water outlet 9 at a temperature of between 60 and 80 0 C.
• the overall temperature difference of between 60 and 80 °C is highly beneficial to the efficiency of, among other things, a CO 2 heat pump.
• the heat pump can be reversed, so as to allow cold liquid to circulate through the heat exchanger 10 and on into the underfloor heating system 14 for cooling of the rooms. This will cool down the cold water in the lower tank 4. This water may be drawn off as chilled drinking water via branch 7.
• the thermal energy recovered from the water in the cooled lower part of the tank 4 may be utilized in the heat pump, for heating the water supplied to the heat exchanger 11.
• the heat exchanger 11 will still receive hot water from the superheat circuit 17 of the heat pump 2, as in the above case, and the hot water in the upper tank 3 is heated about as much as in the first case above.
• a quantity of 100-150 litres of ice will correspond to a power consumption of 70-80 kWh, which should be sufficient to cool down a building for 12-14 hours. Furthermore it will be easier to get rid of excess heat due to the lower outdoor temperature at night, with the heat conduction taking place via the evaporator 23. In hot areas the cooling requirement will be great enough to ensure excess heat regardless, thus providing plenty of hot water in the tank 3.
• Figure 6 shows a simple Mollier diagram for a heat pump, where the numbers in the circles correspond to corresponding numbers in Figures 1 and 2.
• the number 1 represents the energy extracted from the ground or the air.
• the number 3 is represents extraction of high-grade superheat.
• the number 2 is heat extracted from the condenser 18.
• the number 4 is the sum of the heat from the superheat circuit 17 and the condenser 18.
• the curve 45 is the vapour pressure curve for the heating medium. Thermal energy is added to the heating medium along line 40, causing an increase in temperature and, with that, energy content. At the same time, the heating medium evaporates at a constant pressure. Then the gas is compressed along line 41. This increases the pressure, while also giving a slight increase in temperature. The gas is now superheated.
• the heating medium will consist of sub cooled liquid which then expands at near constant pressure along line 43 until the liquid starts to evaporate.
• FIG. 5 shows a diagram of the daily mean temperature of air (curve L) in the course of a typical one year cycle somewhere in Norway.
• the figure also includes a curve showing the temperature in a borehole (curve B) used for energy extraction for a heat pump.
• curve L the daily mean temperature of air
• curve B the temperature in a borehole
• Curve B' shows the temperature of the borehole when this is connected to a heat pump that alternates between extracting energy from air and from the borehole.
• a heat pump that alternates between extracting energy from air and from the borehole.
• the predetermined value at which the energy extraction switches from air to ground or vice versa will, in a simple embodiment of the invention, be an inconstant value. However, it is more appropriate for the value to depend on the temperature difference between the air and the borehole, also taking into consideration the time of year, i.e. the date, and local conditions.
• FIG. 3 shows a further embodiment of the invention.
• the water heater 1 includes three tanks 3, 4 and 30 which are thermally insulated from each other.
• the tanks are interconnected via transfer passages 6, 31.
• the lowermost tank 30 is supplied with cold water from the cold water mains via a cold water inlet 33, and is provided with a heat exchanger 32 which is supplied with waste water (so-called grey water) at a temperature which will vary, naturally, but which will always be higher than the temperature of the cold water.
• waste water waste water
• Figure 4 shows a further embodiment of the invention.
• This comprises a water heater 1 and a heat pump 2.
• the system includes a heat exchanger 33 for waste water.
• the heat exchanger is located in a buffer tank 34 for the cooling/heating medium of the heat pump 2.
• the cooling/heating medium is passed through the buffer tank 34 and down into a borehole 35.
• this system allows heat to be extracted from the waste water and stored in the borehole 35.
• the ground around the borehole 35 will be at a higher temperature than that which would otherwise be the case, and the heat may then be recovered by means of the heat pump.
• the waste water will also make a positive contribution of heat.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Steam Or Hot-Water Central Heating Systems (AREA)
• Heat-Pump Type And Storage Water Heaters (AREA)
• Other Air-Conditioning Systems (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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ID=35267125

Family Applications (1)

Country Status (3)

Cited By (15)

Families Citing this family (1)

Family Cites Families (10)

• 2005
  • 2005-03-23 NO NO20051559A patent/NO326274B1/no not_active IP Right Cessation
• 2006
  • 2006-03-23 WO PCT/NO2006/000112 patent/WO2006101405A2/en active Application Filing
  • 2006-03-23 EP EP06716781.7A patent/EP1866574A4/en not_active Withdrawn

Non-Patent Citations (1)

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