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WO2006079808A1 - Systeme d’echange thermique - Google Patents

Systeme d’echange thermique Download PDF

Info

Publication number
WO2006079808A1
WO2006079808A1 PCT/GB2006/000255 GB2006000255W WO2006079808A1 WO 2006079808 A1 WO2006079808 A1 WO 2006079808A1 GB 2006000255 W GB2006000255 W GB 2006000255W WO 2006079808 A1 WO2006079808 A1 WO 2006079808A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
heat
cooling medium
exchange system
heat exchange
Prior art date
Application number
PCT/GB2006/000255
Other languages
English (en)
Inventor
Ray Morse
Original Assignee
F-Technologies Limited
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
Application filed by F-Technologies Limited filed Critical F-Technologies Limited
Publication of WO2006079808A1 publication Critical patent/WO2006079808A1/fr

Links

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
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements
    • F25B2313/02533—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in parallel arrangements during heating
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
    • F25B2313/0254—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in series arrangements
    • F25B2313/02541—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units in series arrangements during cooling
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/02—Increasing the heating capacity of a reversible cycle during cold outdoor conditions
    • 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
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/006—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing frost
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine

Definitions

  • the present invention relates to a heat exchanging system.
  • Reverse cycle air conditioning units have been commonly employed for the purpose of regulating the temperature within the retail outlet.
  • refrigeration equipment and air conditioning units are installed as totally separate units for physical and thermodynamic reasons.
  • the heat pump utilises an outdoor heat exchanger as a refrigerant evaporator with the heat source being provided by an ambient medium.
  • Operating temperatures may be such that ice is commonly formed on the external surfaces of the heat exchanger. Such ice inhibits the flow of the ambient medium thereby reducing the heat exchange process and preventing the system from operating correctly. Consequently, periodic defrosting of the heat exchanger is required, at which times, the entire heat supply is suspended.
  • the present invention seeks to alleviate the aforementioned disadvantages of conventional heat pump systems by utilising heat exiting the refrigeration plant to increase the heat pump efficiency in all ambient temperature conditions. As such, periodic defrosting of the heat exchanger may no longer be required.
  • a heat exchange system comprising a first heat exchanger which varies the temperature of a cooling medium drawn therethrough, a second heat exchanger for receiving the cooling medium and a third heat exchanger in communication with the second heat exchanger to allow refrigerant to pass therebetween.
  • first, second and third heat exchangers are combined to form a single heat exchanging unit.
  • a heat exchange system comprising a first heat exchanger which varies the temperature of a cooling medium drawn therethrough, a second heat exchanger for receiving the cooling medium and connecting link between the first and second heat exchangers, the connecting link having a valve to allow or prevent refrigerant to pass between the first and second heat exchangers.
  • Figure 1 is a schematic diagram of a heat exchanger system constructed in accordance with a first embodiment of the present invention showing how the system operates in winter months;
  • Figure 2 is a schematic diagram of a heat exchanger system of Figure 1 showing how the system operates in summer months;
  • Figure 3 is a schematic diagram of a heat exchanger system constructed in accordance with a second embodiment present invention showing how the system operates in winter months;
  • Figure 4 is a schematic diagram of a heat exchanger system of Figure 3 showing how the system operates in summer months.
  • the cooling medium used is air, drawn over the heat exchangers by fans.
  • water or another fluid could equally be used as a cooling medium, drawn over the heat exchangers by appropriate means.
  • FIG. 1 shows the principles of winter operation of a heat exchanger system constructed in accordance with the present invention
  • Air at outside ambient temperature is initially drawn through a first heat exchanger 1 (such as a refrigeration plant condenser) which acts a heat source, by a fan or fans 4 (in the direction of the arrow 2 shown in Figures 1 and 2). As it passes through the heat exchanger 1, the temperature of the cooling medium is raised. The fan or fans 4 draw the cooling medium (now at a raised temperature) through a second heat exchanger 3, which acts as an evaporator, located adjacent the first heat exchanger 1.
  • the elevated temperature of the air being drawn through the second heat exchanger 3 permits a relatively high refrigerant evaporating temperature within the heat exchanger 3 which results in an increase in the efficiency of the heat exchanging system.
  • the elevated evaporating temperature minimises or prevents ice formation on the outer surface of the heat exchanger 3 thus allowing continuous or near continuous operation of the system.
  • Vaporised refrigerant from the second heat exchanger 3 is compressed by at least one compressor 15 and thereby heated.
  • the refrigerant travels to a third heat exchanger 16, which acts as a condenser and which, consequently, provides heat to a building within which the heat exchanger is located.
  • Condensed liquid from the heat exchanger 16 travels to a header 11 on a fourth heat exchanger 10.
  • the unit 10 provides a storage unit for liquid refrigerant. Air, at outside ambient temperature, is drawn through the heat exchanger 10 by the fan or fans 4 to provide sub-cooling to the liquid refrigerant stored therein. Sub-cooled liquid from the heat exchanger 10 is supplied from a header 9 of the heat exchanger 10 to a header 6 of the second heat exchanger 3 through a connecting line 8 via an expansion device 13. A connecting line 7 is closed using a mechanical or similar device 12. The header 6 then distributes the liquid refrigerant through the heat exchanger 3 thereby continuing the system cycle.
  • FIG. 1 shows the principles of summer operation of the illustrated heat exchanger system.
  • Cooling air is drawn through the heat exchanger 3.
  • the refrigerant within the heat exchanger 3, which may now be cooled (de-superheated) vapour or condensed liquid is collected by the header 6 and communicated to the header 9 of the fourth heat exchanger 10 via a connecting line 7.
  • the connecting line 7 is opened using a mechanical or similar device 12.
  • a flow of refrigerant from header 6 of the second heat exchanger 3 to header 9 of the fourth heat exchanger 10 through the connecting line 8 is prevented by a one-way valve or similar device 14.
  • the refrigerant is distributed through the fourth heat exchanger 10 via header 9.
  • a flow of cooling air at ambient outside temperature is drawn through the fourth heat exchanger to cause the refrigerant therein fully to condense into a liquid.
  • the heat exchanger 10 stores the liquid refrigerant.
  • the combined use of heat exchangers 3 and 10 negates any loss in system efficiency caused by the cooling air being drawn through the heat exchanger 3 having been pre-heated by the first heat exchanger 1.
  • the refrigerant travels from the header 11 of the fourth heat exchanger 10 to the third heat exchanger 16, which now acts as an evaporator and which, consequently, provides a cooling effect to a building within which the heat exchanger may be located.
  • the first, second and fourth heat exchangers 1, 3, 10 and the communications therebetween may be all constructed as one unit.
  • the unit may be located within an enclosure.
  • the enclosure unit may take the form of an acoustic absorption unit such as one marketed by the applicant and described in the applicant's previous UK Patent No. 2351795 and International application no. PCT/GB04/002613 both of which are incorporated herein by reference.
  • a further heat exchanger having an adiabatic pad incorporated therein is located adjacent to the first heat exchanger through which the cooling medium travels through prior to the first heat exchanger.
  • FIGS 3 and 4 illustrate a heat exchanging system constructed in accordance with a second embodiment of the invention.
  • This embodiment is a simplified variation of the first embodiment. Winter operation of this embodiment is shown in Figure 3. The operation is much the same as the winter operation of the first embodiment.
  • Air at outside ambient temperature is drawn through a first heat exchanger 20 (such as a refrigeration plant condenser) which acts a heat source, by a fan or fans 21 (in the direction of the arrow shown in Figures 3 and 4). As it passes through the heat exchanger 20, the temperature of the cooling medium is raised. The fan or fans 21 draw the cooling medium (now at a raised temperature) through a second heat exchanger 22, which acts as an evaporator.
  • a first heat exchanger 20 such as a refrigeration plant condenser
  • the fan or fans 21 draw the cooling medium (now at a raised temperature) through a second heat exchanger 22, which acts as an evaporator.
  • Hot gas from a refrigeration compressor 23 is provided through a connecting line 24 to a header 25 of the first heat exchanger 20.
  • a further connecting line 26 extends between the first and second heat exchangers 20, 22.
  • the connecting line 26 includes a one way valve 27.
  • the valve 27 may for example be a solenoid valve. During winter operation the valve 27 is shut so not to allow the flow of hot gas between the heat exchangers 20, 22.
  • a further connecting line 29 includes a one way valve 30. During winter operation the valve 30 is shut so not to allow the flow of hot gas into line 31.
  • FIG. 4 Summer operation of this embodiment is shown in Figure 4.
  • hot gas is received by the second heat exchanger 22 from the discharge of both the refrigeration and air conditioning compressors.
  • Valve 30 in connecting line 29 is open to allow this.
  • Valve 28 is shut so not to allow the flow of hat gas directly into the first heat exchanger 20.
  • the vapour is distributed through the heat exchanger 22 (which now acts as a de- superheater or condenser) by a header 32 and is transmitted to the first exchanger 20 through the connecting line 26, the valve 27 which is now open.
  • the flow of cooling air at ambient outside temperature drawn through the first heat exchanger 20 causes the refrigerant therein fully to condense into a liquid.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

La présente invention concerne un système d’échange thermique comprenant au moins deux échangeurs thermiques pouvant être actionnés pour chauffer un agent de refroidissement pendant les mois d’hiver et pour refroidir l’agent de refroidissement pendant les mois d’été et transmettre l’agent de refroidissement à un emplacement nécessitant la climatisation.
PCT/GB2006/000255 2005-01-25 2006-01-25 Systeme d’echange thermique WO2006079808A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB05011462.6 2005-01-25
GBGB0501462.6A GB0501462D0 (en) 2005-01-25 2005-01-25 Heat exchanging system

Publications (1)

Publication Number Publication Date
WO2006079808A1 true WO2006079808A1 (fr) 2006-08-03

Family

ID=34259600

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/000255 WO2006079808A1 (fr) 2005-01-25 2006-01-25 Systeme d’echange thermique

Country Status (2)

Country Link
GB (1) GB0501462D0 (fr)
WO (1) WO2006079808A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139924A (en) * 1960-12-08 1964-07-07 I C E D Inc Internal combustion engine driven heat pump
EP1108575A1 (fr) * 1998-08-20 2001-06-20 Zexel Valeo Climate Control Corporation Conditionneur d'air pour vehicules
JP2001289532A (ja) * 2000-02-02 2001-10-19 Mitsubishi Electric Corp 冷凍空調装置、およびその運転方法
US6826921B1 (en) * 2003-07-03 2004-12-07 Lennox Industries, Inc. Air conditioning system with variable condenser reheat for enhanced dehumidification

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139924A (en) * 1960-12-08 1964-07-07 I C E D Inc Internal combustion engine driven heat pump
EP1108575A1 (fr) * 1998-08-20 2001-06-20 Zexel Valeo Climate Control Corporation Conditionneur d'air pour vehicules
JP2001289532A (ja) * 2000-02-02 2001-10-19 Mitsubishi Electric Corp 冷凍空調装置、およびその運転方法
US6826921B1 (en) * 2003-07-03 2004-12-07 Lennox Industries, Inc. Air conditioning system with variable condenser reheat for enhanced dehumidification

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 02 2 April 2002 (2002-04-02) *

Also Published As

Publication number Publication date
GB0501462D0 (en) 2005-03-02

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