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WO1999042767A1 - System for the thermal compensation of an air-conditioning unit with heat pump - Google Patents

System for the thermal compensation of an air-conditioning unit with heat pump Download PDF

Info

Publication number
WO1999042767A1
WO1999042767A1 PCT/IT1999/000034 IT9900034W WO9942767A1 WO 1999042767 A1 WO1999042767 A1 WO 1999042767A1 IT 9900034 W IT9900034 W IT 9900034W WO 9942767 A1 WO9942767 A1 WO 9942767A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
heat pump
conditioning unit
heat
thermal compensation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IT1999/000034
Other languages
French (fr)
Inventor
Fernando Garofoli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garofoli SpA
Original Assignee
Garofoli SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from IT98MC000015 external-priority patent/IT1299605B1/en
Priority claimed from IT1998AN000054A external-priority patent/ITAN980054A1/en
Application filed by Garofoli SpA filed Critical Garofoli SpA
Priority to AU32718/99A priority Critical patent/AU3271899A/en
Publication of WO1999042767A1 publication Critical patent/WO1999042767A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F28D20/0052—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using the ground body or aquifers as heat storage medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/30—Geothermal collectors using underground reservoirs for accumulating working fluids or intermediate fluids
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

Definitions

  • This patent application concerns a system for the thermal compensation of an air-conditioning unit with heat pump used to maintain the thermal output of the heat pump at acceptable levels also when the temperature of the external air drops several degrees below zero. It must be noted that in all the heat pumps that are currently available on the market - when used as heating units - the thermal output lowers when the temperature of the external air decreases. These models prove practically inefficient when the temperature falls below (- 5° C).
  • the purpose of the present invention is to design a system for the thermal compensation of air-conditioning units with heat pump capable of avoiding that - when the air-conditioning unit works as heating system - the thermal output of the heat pump becomes unacceptable because of the cooling of the external air below zero degrees.
  • a compensation system has been designed able to pre-heat the external air before the external air reaches the walls of the heat exchanger incorporated into the air-conditioning unit.
  • this compensation system uses the subsurface as heat source for the pre-heating of the external air, since the average temperature at a depth of about 3 meters is constantly around values of (+10:12°C) throughout the year.
  • a natural inexhaustible heat source - such as the subsurface - that is also available in geographical areas with high latitude allows for giving a considerable crucial thermal contribution to the energy - 2 -
  • the compensation system according to the present invention comprises an air-water heat exchanger housed inside the duct used by the fan of the air-conditioning unit to suck the external air.
  • the system according to the present invention also comprises a hermetically closed underground well filled with water that is pumped towards the exchanger and then goes back down into the well in a closed circuit pattern.
  • the heat given by the water that circulates inside the exchanger to the external air is enough to heat the air from temperatures lower than (-10°C) up to temperatures a few degrees above zero, thus guaranteeing the efficiency of the heat pump.
  • the compensation system as described above does not work when the temperature of the external air goes below (-10°C) since the heat contribution given by the water that circulates in the pre-heating exchanger is not enough to increase the temperature of the external air to values above zero.
  • the above-mentioned cabin is provided with doors for the entry and exit of the external air that are automatically opened when the temperature of the external air goes over the set values in order to avoid the re-circulation of the air inside the cabin and increase the efficiency of the system.
  • - Fig. 1 is the diagram of the compensation system according to the present invention in its basic constructive version
  • - Fig. 2 is the diagram of the compensation system according to the present invention in a slightly modified version with respect to the one shown in Fig. 1 that can be used when the air-conditioning unit is powered by a generator;
  • FIG. 3 is the diagram of the compensation system according to the present invention in its more sophisticated version in which the pre-heating exchanger and the heat pump are housed inside an insulated cabin provided with doors for air re-circulation - the doors are closed in this figure;
  • the system according to the present invention in its basic version comprises a hermetically closed underground well (1) filled with water that is sent through a pump (2) into a surface heater exchanger (3) housed inside the duct (4) used by the fan incorporated in the heat pump (5) to suck the external air.
  • the water coming out of the exchanger (3) re-circulates inside the well
  • the air-conditioning unit When the air-conditioning unit is installed in a building in which the electric power supply is given by a generator, the hot air coming out of the cooling radiator (6) of the generator (7) is conveyed in the duct (4) as in the system shown in Fig. 2.
  • the compensation system in its more sophisticated version comprises a hermetically closed underground well (1) filled with water that is sent through a pump (2) into a surface water-air heat exchanger (3) housed inside the duct (4) used by the fan incorporated in the heat pump (5) to suck the external air.
  • the water coming out of the exchanger (3) re-circulates inside the well (1) in a closed circuit pattern.
  • the main characteristic of this constructive version of the compensation system is that the heat pump (5), the heat exchanger (3) and the duct (4) are housed inside an insulated cabin (8) in which the air coming out of the heat pump (5) can be re-circulated - if necessary - towards the heat exchanger (3) that is no longer fed with the external air, but with the air contained inside the cabin (8).
  • the cabin (8) is provided with doors (9) that, when opened, allow for providing the heat exchanger (3) with external air that is discharged into the atmosphere, as shown in Fig. 4, and, when closed, allow for providing the heat exchanger (3) with the air contained inside the cabin (8), as shown in Fig. 3.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

This invention concerns a system for the thermal compensation of an air-conditioning unit with heat pump in which the external air sucked by the fan of the heat pump (5) is heated by means of an air-water heat exchanger (3) fed with water pumped from an underground well (1).

Description

- 1 -
Description
System for the thermal compensation of an air-conditioning unit with heat pump.
This patent application concerns a system for the thermal compensation of an air-conditioning unit with heat pump used to maintain the thermal output of the heat pump at acceptable levels also when the temperature of the external air drops several degrees below zero. It must be noted that in all the heat pumps that are currently available on the market - when used as heating units - the thermal output lowers when the temperature of the external air decreases. These models prove practically inefficient when the temperature falls below (- 5° C).
This is the main reason why heat pumps in heating systems can only be used in geographical areas located under a certain latitude, where during the winter the temperature does not fall below zero degrees or - if it does so - it only gets to a very few degrees below zero.
The purpose of the present invention is to design a system for the thermal compensation of air-conditioning units with heat pump capable of avoiding that - when the air-conditioning unit works as heating system - the thermal output of the heat pump becomes unacceptable because of the cooling of the external air below zero degrees.
To this purpose a compensation system has been designed able to pre-heat the external air before the external air reaches the walls of the heat exchanger incorporated into the air-conditioning unit.
The main characteristic of this compensation system is that it uses the subsurface as heat source for the pre-heating of the external air, since the average temperature at a depth of about 3 meters is constantly around values of (+10:12°C) throughout the year The idea of using a natural inexhaustible heat source - such as the subsurface - that is also available in geographical areas with high latitude allows for giving a considerable crucial thermal contribution to the energy - 2 -
balance of the heating system with heat pump.
More exactly, the compensation system according to the present invention comprises an air-water heat exchanger housed inside the duct used by the fan of the air-conditioning unit to suck the external air. The system according to the present invention also comprises a hermetically closed underground well filled with water that is pumped towards the exchanger and then goes back down into the well in a closed circuit pattern.
In view of the large reserve of water contained in the well - when the heating system works in steady condition - the water temperature remains constantly lower than the subsurface temperature by approximately 6-7 °C.
The heat given by the water that circulates inside the exchanger to the external air is enough to heat the air from temperatures lower than (-10°C) up to temperatures a few degrees above zero, thus guaranteeing the efficiency of the heat pump.
The compensation system as described above, however, does not work when the temperature of the external air goes below (-10°C) since the heat contribution given by the water that circulates in the pre-heating exchanger is not enough to increase the temperature of the external air to values above zero.
In view of this fact a more sophisticated version of the compensation system has been designed in which the pre-heating exchanger and the heat pump are housed inside an insulated cabin that creates an insulated environment whose temperature is affected by the discharge temperature of the heat pump that, in case of external air at (-10°C), is around (-2°C).
When the temperature of the external air goes below (-10°C), in this special constructive version of the compensation system the air coming out of the heat pump is re-circulated through the pre-heating exchanger, with an increase in temperature thanks to the thermal exchange with the water coming from the underground well.
This means that the operation of the system according to this special - 3 -
constructive version is no longer affected or limited by the temperature of the external air.
The above-mentioned cabin is provided with doors for the entry and exit of the external air that are automatically opened when the temperature of the external air goes over the set values in order to avoid the re-circulation of the air inside the cabin and increase the efficiency of the system.
For clearer explication purposes, the description of the invention continues with reference to the enclosed drawings whereby:
- Fig. 1 is the diagram of the compensation system according to the present invention in its basic constructive version;
- Fig. 2 is the diagram of the compensation system according to the present invention in a slightly modified version with respect to the one shown in Fig. 1 that can be used when the air-conditioning unit is powered by a generator;
- Fig. 3 is the diagram of the compensation system according to the present invention in its more sophisticated version in which the pre-heating exchanger and the heat pump are housed inside an insulated cabin provided with doors for air re-circulation - the doors are closed in this figure;
- Fig. 4 is the same as Fig. 3 with the only difference that the doors for air re- circulation are open. With reference to figure 1 , the system according to the present invention in its basic version comprises a hermetically closed underground well (1) filled with water that is sent through a pump (2) into a surface heater exchanger (3) housed inside the duct (4) used by the fan incorporated in the heat pump (5) to suck the external air. The water coming out of the exchanger (3) re-circulates inside the well
(1) in a closed circuit in which the water gives heat to the external air and absorbs heat from the ground surrounding the well (1).
When the air-conditioning unit is installed in a building in which the electric power supply is given by a generator, the hot air coming out of the cooling radiator (6) of the generator (7) is conveyed in the duct (4) as in the system shown in Fig. 2.
It is obvious that in this version of the system according to the present - 4 -
invention a smaller water reserve is necessary in the underground well, since it is possible to take advantage of the heat given by the hot air coming out of the cooling radiator of the generator.
With reference to Fig. 3 the compensation system in its more sophisticated version comprises a hermetically closed underground well (1) filled with water that is sent through a pump (2) into a surface water-air heat exchanger (3) housed inside the duct (4) used by the fan incorporated in the heat pump (5) to suck the external air.
The water coming out of the exchanger (3) re-circulates inside the well (1) in a closed circuit pattern.
The main characteristic of this constructive version of the compensation system is that the heat pump (5), the heat exchanger (3) and the duct (4) are housed inside an insulated cabin (8) in which the air coming out of the heat pump (5) can be re-circulated - if necessary - towards the heat exchanger (3) that is no longer fed with the external air, but with the air contained inside the cabin (8).
The cabin (8) is provided with doors (9) that, when opened, allow for providing the heat exchanger (3) with external air that is discharged into the atmosphere, as shown in Fig. 4, and, when closed, allow for providing the heat exchanger (3) with the air contained inside the cabin (8), as shown in Fig. 3.

Claims

- 5 -
Claims
1) System for the thermal compensation of an air-conditioning unit with heat pump comprising:
- a hermetically closed underground well (1) filled with water;
- a surface heat exchanger (3) housed in the duct (4) used by the fan incorporated in the heat pump (5) to suck the external air;
- a closed hydraulic circuit for the circulation of the water contained in the well (1) that is sent through a pump (2) into the exchanger (3) from which it goes back down into the well (1).
2) System for the thermal compensation of an air-conditioning unit with heat pump according to claim 1) comprising a pipeline that conveys in the above- mentioned duct (4) the hot air coming out of the cooling radiator (6) of the generator (7) that feeds the air-conditioning unit.
3) Improved system for the thermal compensation of an air-conditioning unit with heat pump according to the previous claims, in which the heat pump (5), the heat exchanger (3) and the duct (4) are housed inside an insulated cabin (8) in which the air coming out of the heat pump (5) can be re-circulated towards the heat exchanger (3) by closing the doors (9).
PCT/IT1999/000034 1998-02-20 1999-02-17 System for the thermal compensation of an air-conditioning unit with heat pump Ceased WO1999042767A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32718/99A AU3271899A (en) 1998-02-20 1999-02-17 System for the thermal compensation of an air-conditioning unit with heat pump

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT98MC000015 IT1299605B1 (en) 1998-02-20 1998-02-20 Thermal compensation system for air conditioning unit with heat pump
ITMC98A000015 1998-02-20
IT1998AN000054A ITAN980054A1 (en) 1998-12-11 1998-12-11 IMPROVED SYSTEM FOR THE THERMAL COMPENSATION OF A HEAT PUMP AIR CONDITIONING GROUP
ITAN98A000054 1998-12-11

Publications (1)

Publication Number Publication Date
WO1999042767A1 true WO1999042767A1 (en) 1999-08-26

Family

ID=26330222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1999/000034 Ceased WO1999042767A1 (en) 1998-02-20 1999-02-17 System for the thermal compensation of an air-conditioning unit with heat pump

Country Status (2)

Country Link
AU (1) AU3271899A (en)
WO (1) WO1999042767A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2884300A1 (en) * 2005-04-12 2006-10-13 Denis Consigny INSTALLATION FOR TEMPERING THE AIR INTRODUCED IN THE PREMISES
CN100365356C (en) * 2004-09-30 2008-01-30 北京北控恒有源科技发展有限公司 Low grade energy extraction system for river and lake
FR2916040A1 (en) * 2007-02-28 2008-11-14 Michel Albert Greter Calorie recuperating device for use in e.g. building, has case adapted to any caloric power, insulated by panels and supplied by calories via well or other sources to ensure ideal exploitation of pumps in summer or winter seasons
ITMI20082077A1 (en) * 2008-11-21 2010-05-22 Fabio Baioni REFINED GEOTHERMAL PROBE
KR101055350B1 (en) * 2010-02-25 2011-08-08 유경용 Tubular Heat Pump System
AU2008241236B2 (en) * 2007-04-18 2012-05-24 Pavel Simka Heat pump system and method for pumping liquids

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2421351A1 (en) * 1978-01-02 1979-10-26 Depot Service Heliothermie Sar Heat emission and diffusion system - has heat exchanger fan controlled by liquid and ambient air temperatures
US4360056A (en) * 1980-03-19 1982-11-23 Spencertown Geo-Solar Associates Geokinetic energy conversion
EP0070545A2 (en) * 1981-07-21 1983-01-26 Giorgio Pagliarani Device for producing electric energy and heat
US4375831A (en) * 1980-06-30 1983-03-08 Downing Jr James E Geothermal storage heating and cooling system
DE3206577A1 (en) * 1982-02-19 1983-09-01 Siemens AG, 1000 Berlin und 8000 München Geoheat collector for heat pumps

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2421351A1 (en) * 1978-01-02 1979-10-26 Depot Service Heliothermie Sar Heat emission and diffusion system - has heat exchanger fan controlled by liquid and ambient air temperatures
US4360056A (en) * 1980-03-19 1982-11-23 Spencertown Geo-Solar Associates Geokinetic energy conversion
US4375831A (en) * 1980-06-30 1983-03-08 Downing Jr James E Geothermal storage heating and cooling system
EP0070545A2 (en) * 1981-07-21 1983-01-26 Giorgio Pagliarani Device for producing electric energy and heat
DE3206577A1 (en) * 1982-02-19 1983-09-01 Siemens AG, 1000 Berlin und 8000 München Geoheat collector for heat pumps

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100365356C (en) * 2004-09-30 2008-01-30 北京北控恒有源科技发展有限公司 Low grade energy extraction system for river and lake
FR2884300A1 (en) * 2005-04-12 2006-10-13 Denis Consigny INSTALLATION FOR TEMPERING THE AIR INTRODUCED IN THE PREMISES
WO2006109003A1 (en) * 2005-04-12 2006-10-19 Climatisation Par Puits Canadiens Geothermal air conditioning device
FR2916040A1 (en) * 2007-02-28 2008-11-14 Michel Albert Greter Calorie recuperating device for use in e.g. building, has case adapted to any caloric power, insulated by panels and supplied by calories via well or other sources to ensure ideal exploitation of pumps in summer or winter seasons
AU2008241236B2 (en) * 2007-04-18 2012-05-24 Pavel Simka Heat pump system and method for pumping liquids
ITMI20082077A1 (en) * 2008-11-21 2010-05-22 Fabio Baioni REFINED GEOTHERMAL PROBE
EP2189731A1 (en) * 2008-11-21 2010-05-26 Fabio Baioni Geothermal probe
KR101055350B1 (en) * 2010-02-25 2011-08-08 유경용 Tubular Heat Pump System

Also Published As

Publication number Publication date
AU3271899A (en) 1999-09-06

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