EP0089988B1 - Method of recovering thermal energy by heat pump from sea water and comparable water masses - Google Patents

Method of recovering thermal energy by heat pump from sea water and comparable water masses Download PDF

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Publication number
EP0089988B1
EP0089988B1 EP82902921A EP82902921A EP0089988B1 EP 0089988 B1 EP0089988 B1 EP 0089988B1 EP 82902921 A EP82902921 A EP 82902921A EP 82902921 A EP82902921 A EP 82902921A EP 0089988 B1 EP0089988 B1 EP 0089988B1
Authority
EP
European Patent Office
Prior art keywords
evaporator
conduit
medium
heat
water
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.)
Expired
Application number
EP82902921A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0089988A1 (en
Inventor
Lennart Litzberg
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.)
SKANDINAVISK INSTALLATIONSSAMORDNING AB
Original Assignee
SKANDINAVISK INSTALLATIONSSAMORDNING AB
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 SKANDINAVISK INSTALLATIONSSAMORDNING AB filed Critical SKANDINAVISK INSTALLATIONSSAMORDNING AB
Publication of EP0089988A1 publication Critical patent/EP0089988A1/en
Application granted granted Critical
Publication of EP0089988B1 publication Critical patent/EP0089988B1/en
Expired legal-status Critical Current

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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

Definitions

  • This invention relates to a method of recovering thermal energy from sea water and similar water masses.
  • the thermal energy received and stored in earth during the "summer half-year" can be utilized during the "winter half-year".
  • the thermal energy in principle is utilized in that hoses or conduits of very great length are laid out on a suitable depth, and a heat carrier (for example water and glycol) is circulated through the hose in order to take up the thermal energy stored in earth and deliver it to the evaporator in a heat pump.
  • a heat carrier for example water and glycol
  • a parallel or alternative method to these methods is to recover, instead, during the winter half-year the thermal energy stored in the sea, lakes and water courses during the warmer period of the year. During the colder periods of the year, the heat, relatively seen, is constant at the depth significant for the water mass concerned.
  • the thermal energy in practice also in this case is recovered by means of hoses or pipes, which are laid out on the sea bottom, with a heat carrier, which delivers the thermal energy taken-up to the evaporator of the heat pump.
  • the earth mass about the conduit holds a temperature slightly above ⁇ 0°C, normally +1°C to +2°C. Heat being transported away with the heat carrier, the temperature in the surrounding earth mass drops all the time. Temperatures below ⁇ 0°C are obtained, which implies ice formation about the conduit, resulting in a deteriorated efficiency degree.
  • Conduits besides, are subject to external soiling a.o. by algal growth, which also reduces the efficiency degree.
  • the present invention renders it possible, in combination with heat pump technology, to continuously recover the thermal energy of the sea water or comparable water masses during the colder period of the year and to choose such dimensioning data, that sea water with a temperature close to the freezing point can be utilized with full installed heat pump capacity without being obstructed by ice formation.
  • Fig. 1 very schematically shows an installation for carrying out the invention
  • Fig. 2 shows another design of the installation.
  • a heat exchanger 3 is positioned directly into the sea water (Fig. 1).
  • a heat carrier for example a mixture of water and glycol, in pumped by a pump 6 from the heat exchanger 3 via the conduit 7 and 11 to the evaporator of a heat pump 8, which is known per se and here not described in detail. From the pump the heat carrier is returned via the conduit 9 and 12 to the heat exchanger 3.
  • a shunt conduit 10 interconnects the conduits 7 and 9, so that the evaporator is by-passed. 4 designates in general the conduits, which connect the condenser of the heat pump to the heating system or systems served by the heat pump. 13 designates the surface of the sea water.
  • the heat exchanger 3 in which the heat of the sea water is taken up by the heat carrier, can preferably be of the type where the heat carrier flows in pipe coils concentrically arranged in each other, between which sea water flows.
  • the brushes are effected to rotate by a drive motor, for example electric or hydraulic, which in the latter case can be driven by the pump-operated heat carrier system.
  • the heat exchanger is provided at its bottom with an inlet opening for sea water. This opening can be connected to a conduit, which opens in a place at a depth suitable for utilizing in wintertime the highest thermal capacity of the water.
  • the principle of such a heat exchanger is described in DE-A-2825729 and in DE-A-3039505.
  • the sea water can be pumped through a conduit 1 by means of a pump 2 to a heat exchanger 3 and be returned to the sea through a conduit 5.
  • the inlet of the conduit 1 in the sea is positioned in a place where during the winter half-year the highest temperature prevails.
  • the outlet of the conduit 5 in principle can be positioned in any place, but at such a distance from the inlet that the water mass about the inlet is not affected by the temperature of the outlet water.
  • a heat carrier is pumped by a pump 6 from the heat exchanger 3 via conduits 7 and 11 to the evaporator of a heat pump.
  • a shunt conduit 10 interconnects the conduits 7 and 9 so that the evaporator is by-passed.
  • 4 designates generally the conduits, which connect the condenser of the heat pump to the heating system or systems served by the heat pump.
  • 13 designates the surface of the sea water
  • 14 designates the sea water surface in the interior of the heat exchanger.
  • a location of the exchanger when sea water is passed through it by a pump can be exemplified as follows.
  • sea water for example with a temperature of +2°C
  • the sea water which is pumped at a relatively large flow, delivers heat in the heat exchanger 3 to the heat carrier and flows out of the exchanger via the conduit 5 at a temperature of +1,5°C.
  • the heat carrier which has a slightly smaller flow, arrives at the heat exchanger 3 at a temperature of -1°C, takes up heat from the sea water in the heat exchanger and, according to the example, thus flows out of the heat exchanger at a temperature higher by one degree, i.e. at ⁇ 0°C.
  • the heat carrier holds this temperature when it arrives at the evaporator surfaces of the heat pump 8 through the conduit 11.
  • heat is delivered (assumed evaporation temperature -7°C), and the heat carrier leaves the evaporator via the conduit 12 at a temperature of -4°C.
  • the flow through the evaporator is about one quarter of the heat carrier flow through the heat exchanger, and this part of the heat carrier, at -4°C, is mixed after the shunt 10 with the remaining shunted part of the heat carrier, at 0°C, in the conduit 9. Therefore, the temperature of the heat carrier arriving at the heat exchanger 3 is the aforementioned temperature of -1°C.
  • sea water with forced and large flow is used, in combination with a carrier, which also has a large flow, a part of which is shunted past the evaporator of the heat pump, it is possible to approach the freezing point without ice forming on the heat exchanger surfaces.
  • a shunt valve is provided, through which the heat supply to the evaporator can be controlled and preferably is maintained constant or is varied according to load demand, depending on the temperatures of the sea water, and therewith of the heat carrier, varying within certain limits.
  • conduits 11 and 12 have great length, for example for construction-technical reasons, the flow resistance in these conduits will be too great for rendering controlled shunting in the conduit 10 by only one shunt valve possible.
  • a pump is provided, for example in the conduit 11, as indicated by a dashed line at 15 in Fig. 2, by means of which pump the flow through the conduits 11, 12 is controlled.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Farming Of Fish And Shellfish (AREA)
EP82902921A 1981-09-16 1982-09-15 Method of recovering thermal energy by heat pump from sea water and comparable water masses Expired EP0089988B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8105501A SE428154C (sv) 1981-09-16 1981-09-16 Forfarande for att utvinna vermeenergi ur sjovatten
SE8105501 1981-09-16

Publications (2)

Publication Number Publication Date
EP0089988A1 EP0089988A1 (en) 1983-10-05
EP0089988B1 true EP0089988B1 (en) 1985-02-13

Family

ID=20344566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82902921A Expired EP0089988B1 (en) 1981-09-16 1982-09-15 Method of recovering thermal energy by heat pump from sea water and comparable water masses

Country Status (6)

Country Link
EP (1) EP0089988B1 (sv)
DE (1) DE3262340D1 (sv)
FI (1) FI71416C (sv)
NO (1) NO152062C (sv)
SE (1) SE428154C (sv)
WO (1) WO1983001102A1 (sv)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT1101U1 (de) * 1995-10-31 1996-10-25 Ulrich Peter Leeb Verfahren und anlage zur erwärmung von teilen offener, stehender gewässer
AT404184B (de) * 1995-10-31 1998-09-25 Ulrich Peter Leeb Verfahren und anlage zur erwärmung von teilen offener, stehender gewässer
CN100412468C (zh) * 2006-05-12 2008-08-20 衣家文 利用水源热泵换热的方法及设备
FI20096291A0 (sv) 2009-12-04 2009-12-04 Mateve Oy Jordkrets i ett lågenergisystem

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT335671B (de) * 1974-12-20 1977-03-25 Interliz Anstalt Regeleinrichtung fur eine warmepumpe

Also Published As

Publication number Publication date
NO152062C (no) 1985-07-24
FI71416C (fi) 1986-12-19
DE3262340D1 (en) 1985-03-28
SE428154C (sv) 1984-09-13
SE428154B (sv) 1983-06-06
WO1983001102A1 (en) 1983-03-31
FI71416B (fi) 1986-09-09
NO152062B (no) 1985-04-15
SE8105501L (sv) 1983-03-17
EP0089988A1 (en) 1983-10-05
FI831640L (fi) 1983-05-11
FI831640A0 (fi) 1983-05-11
NO831620L (no) 1983-05-06

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