WO2005045324A1 - Ameliorations dans et concernant la recuperation de chaleur - Google Patents

Ameliorations dans et concernant la recuperation de chaleur

Info

Publication number
WO2005045324A1
WO2005045324A1 PCT/GB2004/004576 GB2004004576W WO2005045324A1 WO 2005045324 A1 WO2005045324 A1 WO 2005045324A1 GB 2004004576 W GB2004004576 W GB 2004004576W WO 2005045324 A1 WO2005045324 A1 WO 2005045324A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
heat exchanger
working fluid
recovery apparatus
liquid
Prior art date
Application number
PCT/GB2004/004576
Other languages
English (en)
Inventor
Paul Swallow
John Anthony Hunt
Original Assignee
Optimum Planned Maintenance 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 Optimum Planned Maintenance Limited filed Critical Optimum Planned Maintenance Limited
Publication of WO2005045324A1 publication Critical patent/WO2005045324A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention relates to apparatus and methods for heat recovery.
  • Cooling is normally based on a vapour-liquid refrigeration cycle in which a vapour is compressed, cooled in a condenser, expanded and then evaporated to take in heat .
  • the use of heat generated by the compression of gas in the refrigeration cycle to aid in the heating of water is taught by e.g. US 4142379.
  • the system of US 4142379 does not allow for efficient matching of the waste heat rejection and fails to address certain requirements for safety and convenience .
  • the present invention provides a heat recovery apparatus, the apparatus comprising: a main input for receiving liquid to be heated; a main output for supplying liquid to a principle heating source; a first heat exchanger arranged to receive heat from a cooling system and to transfer that heat to a working fluid; and a second heat exchanger arranged to receive working fluid from the first heat exchanger and transfer heat from the working fluid to liquid between the main input and the main output .
  • the heat recovery apparatus further comprises a storage tank including a third heat exchanger, the storage tank arranged to selectively receive liquid from the main input and to selectively supply liquid to the main output, and the third heat exchanger arranged to selectively receive heated working fluid from the first heat exchanger and transfer heat from the working fluid to liquid in the tank.
  • the apparatus comprises control means arranged to control at least one or more of: the supply of liquid from the main input to the storage tank; the supply of liquid from the storage tank to the main output; and the supply of working fluid to the third heat exchanger.
  • the apparatus comprises bypass means arranged to selectively isolate the first or second heat exchangers from the apparatus.
  • the bypass means are arranged to operate under the control of the control means .
  • the first and second heat exchangers comprise plate type heat exchangers.
  • the liquid comprises water.
  • the working fluid comprises water.
  • the third heat exchanger comprises an indirect coil heat exchanger
  • the heat recovery apparatus comprises a sealed system.
  • the heat recovery apparatus comprises at least one oxygen inhibitor arranged between the first and second heat exchangers to remove oxygen from the working fluid.
  • a method of heat recovery in an apparatus including a cooling system, the method comprising the steps of: (a) receiving at a first heat exchanger heat from the cooling system; (b) transferring heat to a working fluid in the first heat exchanger; and (c) receiving at a second heat exchanger heat from the working fluid and transferring heat from the working fluid to a liquid to be heated.
  • Figure 1 shows a schematic view of a heat recovery apparatus according to a preferred embodiment of the present invention coupled to cooling system and to a principle heating source.
  • FIG. 1 shows schematic view of a heat recovery apparatus 10 according to a preferred embodiment of the present invention.
  • the apparatus 10 is coupled to cooling system 20 and to a principle heating source 30.
  • the apparatus 1 includes first, second and third heat exchangers 11,12,13 and a storage tank 14.
  • the cooling system 20 comprises a vapour-liquid refrigeration cycle in which a vapour is compressed in a compressor 21 becoming hot, cooled in a condenser 22, expanded in a throttle 23 and then evaporated in an evaporator 24 to take in heat.
  • the cooling system may be a refrigeration system, an air conditioning system or another process cooling system.
  • the compressed gas output by the compressor 21 is supplied either directly to the condenser 22 as shown by the dashed interconnection if the heat recovery apparatus 10 is not in use. If the heat recovery apparatus is in use the compressed gas output by the compressor 21 is supplied to the condenser 22 after passing through the first heat exchanger 11.
  • the first heat exchanger 11 comprises a high efficiency plate type heat exchanger, and is arranged to transfer heat from the compressed gas output from the compressor 21 to a working fluid contained in a closed loop 16.
  • the working fluid preferably comprises water.
  • the working fluid in the loop 16 is circulated by a pump 18 and can be selectively provided from the first heat exchanger 11 to the second heat exchanger 12 and the third heat exchanger 13, or to both in varying proportions.
  • the loop 16 is a pressurised loop, and preferably contains a pressure vessel, a pressure monitor and an oxygen inhibitor.
  • the pressure vessel helps maintain pressure in the loop 16, the pressure monitor allows an increase or drop in pressure to be- noted and acted upon, and the oxygen inhibitor reduces the corrosive effect of oxygen within the loop by removing some or all of oxygen dissolved in the water of the loop 16 on installation.
  • the third heat exchanger 13 comprises an indirect coil heat exchanger arranged within the storage tank 14.
  • the tank 14 is filled with water received from the mains or from a tank feed via a main input 15. When water within the tank 14 is heated to a desired temperature it may be selectively fed to a main output 17. Water supplied to the main output 17 is fed to the principle heating source 30 for further heating, if required, and then to a hot water output 31.
  • the second heat exchanger 12 comprises a high efficiency plate type heat exchanger, and is arranged to receive water from the first heat exchanger 11 on one side and to receive water from the main input 15 on the other side. Water received from the main input 15 is heated in the second heat exchanger is then fed to the main output 17. As with water fed to the main output 17 from the tank 14 water supplied to the main output 17 from the second heat exchanger 12 is fed to the principle heating source 30 for further heating, if required, and then to a hot water output 31.
  • the heat recovery apparatus as described offers a number of advantages. Firstly, the cooling of the gas from the compressor 21 that takes place in the first heat exchanger 11 reduces the cooling required in the condenser 22 and increases the efficiency of the cooling system 20.
  • the use of first and second heat exchangers 11,12 to transfer heat from the gas to water at the main outlet 17 means that water in the main outlet 17 is never in direct contact with the potentially harmful gas. Therefore, the invention is safer than existing systems in the event of a gas leak in a heat exchanger.
  • tank 14 allows a heat capacity of hot water to be built up when the heat requirement at the main outlet 17 is low and the cooling system is in operation.
  • control means preferably a microprocessor to control the supply of liquid from the main input to the tank; the supply of liquid from the storage tank to the main output; and the supply of working fluid to the third heat exchanger this heat storage functionality can be simply and automatically administered.
  • the apparatus comprises bypass means arranged to selectively isolate the first heat exchanger 11 from the cooling system.
  • the condenser 22 operates in the cooling system as if the heat recovery apparatus was not present.
  • the bypass means comprise a valve arranged to operate under the control of the control means. Further isolation is provided by inclusion of a further diverter to allow cold water received from the main input 15 to be fed directly to the principle heating source 30.
  • the principle heating source 30 may comprise a boiler, a calorifier, a hot water cylinder with an immersion element, or another suitable heating source.
  • the principle heating source 30 is preferably arranged so that output from the hot water output 31 is heated above 62 degrees Celsius and remains above this temperature for long enough to kill legionella bacteria that may be present in the output .
  • the cooling system has been described based on a typical liquid-vapour refrigeration cycle as may typically be used in refrigeration, air conditioning and process cooling applications. However, other heat pump or thermoelectric cooling systems are also suitable for use with the heat recovery apparatus .
  • the heat recovery apparatus can be applied to the return leg of hot water circuits to provide reheating. It is to be understood that the application of the heat recovery apparatus is in fact wider than water heating alone, and the apparatus is suitable for reducing an overall energy load in plants with other heating requirements and a source of waste heat from cooling systems .
  • the apparatus can be installed either in a new plant or as a retrofit to reduce energy consumption of an existing plant . Retrofitting may conveniently take place when existing plant machinery is closed down for maintenance or repair.

Landscapes

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

Abstract

La présente invention a trait à un appareil de récupération de chaleur (10) apte à recevoir de la chaleur résiduaire en provenance d'un système de refroidissement (20) auquel il est relié, réduisant ainsi la consommation d'énergie d'une source de chaleur principale (30) à laquelle il est également relié. Un fluide de travail reçoit de la chaleur résiduaire en provenance du système de refroidissement (20) au niveau d'un premier échangeur de chaleur (11) et peut ensuite être fournie de manière sélective à un deuxième échangeur de chaleur (12) en vue du préchauffage de liquide pour alimenter la source de chaleur principale (30), ou à un troisième échangeur de chaleur pour réchauffer un stockage de liquide contenu dans un réservoir (14).
PCT/GB2004/004576 2003-10-28 2004-10-28 Ameliorations dans et concernant la recuperation de chaleur WO2005045324A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0325066A GB0325066D0 (en) 2003-10-28 2003-10-28 Improvements in and relating to heat recovery
GB0325066.9 2003-10-28

Publications (1)

Publication Number Publication Date
WO2005045324A1 true WO2005045324A1 (fr) 2005-05-19

Family

ID=29725456

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/004576 WO2005045324A1 (fr) 2003-10-28 2004-10-28 Ameliorations dans et concernant la recuperation de chaleur

Country Status (2)

Country Link
GB (1) GB0325066D0 (fr)
WO (1) WO2005045324A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009026900A1 (fr) * 2007-08-27 2009-03-05 Oewa Wasser Und Abwasser Gmbh Échangeur thermique de sécurité pour la combinaison d'une pompe à chaleur avec un dispositif d'une installation publique d'alimentation en eau potable
GB2469904A (en) * 2009-04-28 2010-11-03 Andrew Joseph Holden Fluid heating arrangement
EP2423605A1 (fr) * 2010-08-24 2012-02-29 C.P. Comercial Prestcold, S.A. Système de climatisation combiné fournissant du froid, de la chaleur et de l'eau chaude domestique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134273A (en) * 1977-04-22 1979-01-16 Brautigam Robert F Home heating and cooling system
US4315597A (en) * 1977-05-02 1982-02-16 Garraffa Jr Jerome Water pre-heater of a refrigeration system
FR2505990A1 (fr) * 1981-05-14 1982-11-19 Calories Geothermiques Solaire Systeme de chauffage pour locaux, notamment pour locaux d'habitation
US6405551B1 (en) * 1999-05-20 2002-06-18 Science, Inc. Heating apparatus having refrigeration cycle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4134273A (en) * 1977-04-22 1979-01-16 Brautigam Robert F Home heating and cooling system
US4315597A (en) * 1977-05-02 1982-02-16 Garraffa Jr Jerome Water pre-heater of a refrigeration system
FR2505990A1 (fr) * 1981-05-14 1982-11-19 Calories Geothermiques Solaire Systeme de chauffage pour locaux, notamment pour locaux d'habitation
US6405551B1 (en) * 1999-05-20 2002-06-18 Science, Inc. Heating apparatus having refrigeration cycle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009026900A1 (fr) * 2007-08-27 2009-03-05 Oewa Wasser Und Abwasser Gmbh Échangeur thermique de sécurité pour la combinaison d'une pompe à chaleur avec un dispositif d'une installation publique d'alimentation en eau potable
US8302675B2 (en) 2007-08-27 2012-11-06 Oewa Wasser Und Abwasser Gmbh Safety heat exchanger for combining a heat pump with a device of a public drinking water supply facility
GB2469904A (en) * 2009-04-28 2010-11-03 Andrew Joseph Holden Fluid heating arrangement
GB2469904B (en) * 2009-04-28 2014-03-19 Andrew Joseph Holden Fluid heating arrangement
EP2423605A1 (fr) * 2010-08-24 2012-02-29 C.P. Comercial Prestcold, S.A. Système de climatisation combiné fournissant du froid, de la chaleur et de l'eau chaude domestique

Also Published As

Publication number Publication date
GB0325066D0 (en) 2003-12-03

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