GB2049123A - Waste water tank for heat exchanger - Google Patents

Waste water tank for heat exchanger Download PDF

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Publication number
GB2049123A
GB2049123A GB8004998A GB8004998A GB2049123A GB 2049123 A GB2049123 A GB 2049123A GB 8004998 A GB8004998 A GB 8004998A GB 8004998 A GB8004998 A GB 8004998A GB 2049123 A GB2049123 A GB 2049123A
Authority
GB
United Kingdom
Prior art keywords
tank
waste water
inlet
duct
water tank
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.)
Granted
Application number
GB8004998A
Other versions
GB2049123B (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2049123A publication Critical patent/GB2049123A/en
Application granted granted Critical
Publication of GB2049123B publication Critical patent/GB2049123B/en
Expired legal-status Critical Current

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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
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0206—Heat exchangers immersed in a large body of liquid
    • F28D1/0213—Heat exchangers immersed in a large body of liquid for heating or cooling a liquid in a tank
    • 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
    • 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
    • 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
    • F28D2020/0069—Distributing arrangements; Fluid deflecting means
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0012—Recuperative heat exchangers the heat being recuperated from waste water or from condensates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/06—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media
    • F28F13/08—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by affecting the pattern of flow of the heat-exchange media by varying the cross-section of the flow channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2250/00—Arrangements for modifying the flow of the heat exchange media, e.g. flow guiding means; Particular flow patterns
    • F28F2250/06—Derivation channels, e.g. bypass
    • 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
    • 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]
    • Y02B30/56—Heat recovery units
    • 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

Landscapes

  • 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)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Water Treatment By Sorption (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Abstract

A waste water tank (1) comprising a heat exchanger has an inlet duct (3) for carrying waste water to the tank and an outlet duct (4) for removing waste water in which the ducts open into the bottom (2) of the tank (1) respectively via an inlet aperture (5) and an outlet aperture (6), said ducts (3, 4), being interconnected and enlarged a short distance from the respective inlet and outlet apertures (5, 6) and are each at least 4 times larger, in cross- sectional area, than the respective passages of the ducts (3, 4), and in which the interconnection between the ducts (3, 4) comprises a duct (13) from respective downward extending ducts (11, 12). <IMAGE>

Description

SPECIFICATION Waste water tank The invention relates to a waste water tank, comprising a heat exchanger, a waste water inlet duct which is constructed as a fall pipe, and a waste water outlet duct which opens into the bottom of the tank and which extends upwards outside the tank at least as far as the maximum filling height of the tank.
Waste water tanks of this kind serve to collect hot and cold waste water of a house where the waste water of the toilets is separately discharged. These waste water tanks comprise a heat exchanger which is used for preheating the warm water which is not intended for consumption and/or which can serve as an evaporator of a heat pump.
In such a waste water tank which is known, for example, from "BBC Nachrichten", 1975, Vol. 8/9, pages 497-502, warm and cold water are both supplied and discharged at the upper side. The already warm waste water in the tank is then mixed with cold waste water, so that only a comparatively low mean temperature arises into the tank. Mechanical presorting of cold and warm water by temperature measurement, comparison of the temperature of the inlet and the tank, and opening or closing of the inlet duct is not feasible in view of poor reliability (for example, contamination in the waste water) and also because of the high costs.
French Patent Application 2,307,235 describes a waste water tank with an inlet and an outlet which both open at the top of the tank. In the tank itself there is provided a partition which is open at the lower side, so that when waste water is admitted, the colder waste water present at the bottom of the reservoir is pushed away and discharged via the outlet. When the admitted waste water is warmer than the waste water already present in the tank, the mean tank temperature is at least maintained. However, when cold water is admitted, it is mixed with the waste water in the tank, so that the mean temperature in the tank decreases and hence also the heat content of the tank.
The invention has for its object to provide a waste water tank reservoir in which the admittance of cold and warm water to the tank is controlled by a difference in the density of the cold and the warm water.
In a waste water tank of the described kind this object is achieved in accordance with the invention in that the inlet duct for the waste water also opens into the bottom of the tank and in that the inlet and outlet ducts change over, at a small distance before the inlet and outlet apertures in the bottom of the tank, into parts having a passage which is at least four times larger than the passage of the inlet and outlet ducts, these parts being connected to the inlet and outlet apertures via upwards extending ducts, being interconnected by a parallel duct via downwards extending ducts.
As a result of the increased passage of the inlet duct, the flow rate of the supplied waste water is reduced so that the upwards and downwards forces prevail. It is thus achieved that it is only because of the higher density that colder water cannot penetrate into the tank but flows directly to the outlet duct via the parallel duct. Only warmer water can reach the tank due to the difference in density, so that always a maximum heat content is maintained. A waste water tank of this kind can be simply and inexpensively manufactured and its operation is virtually trouble-free without requiring additional auxiliary energy.
The passage of the parallel duct preferably corresponds to that of the said parts.
In order to prevent incoming warm waste water from being mixed with somewhat colder waste water present at the bottom of the tank, the duct opening into the inlet aperture in the bottom of the tank is extended with a pipe projecting into the tank.
In order to prevent short-circuiting between inlet aperture and outlet aperture inside the tank and to obtain a uniform displacement current, the inlet and outlet apertures in the bottom of the tank are preferably spaced apart as far as possible. The inlet and outlet apertures in the bottom of the tank are preferably situated near the wall of the tank in two diagonally opposite locations.
In a preferred embodiment of the waste water tank in accordance with the invention, the heat exchanger is formed by a water reservoir which projects into the tank from the top, an inlet for cold water opening into the lower part of said reservoir.
Moreover, the waste water tank can also cooperate with a heat pump. In which case, the lower part of the wall of the tank is preferably constructed as an evaporator of a heat pump or is connected thereto by way of a liquid cycle, the upper part of the water reservoir which is situated outside the tank being constructed as a condenser of the heat pump or being connected thereto by way of a liquid cycle.
Embodiments in accordance with the invention will be described in detail hereinafter with reference to the accompanying diagrammatic drawing.
Figure 1 is a sectional view of a waste water tank with a heat exchanger, and Figure 2 is a sectional view of a waste water tank with a heat exchanger and a heat pump.
The waste water tank shown in Fig. 1 comprises a tank 1 of, for example, metal or a synthetic material. An inlet duct 3, constructed as a fall pipe, and an outlet duct 4 open into the bottom 2 of the tank, the latter duct extending outside the tank 1 at least as far as the maximum filling height of the tank.
The inlet and outlet apertures 5 and 6 in the bottom 2 of the tank are spaced as far apart as possible; they are preferably provided near the wall 1 4 of the tank in two diagonally opposite locations. At a short distance from the inlet and outlet apertures 5 and 6 in the bottom 2 of the tank, the inlet and outlet ducts 3 and 4 change over into parts 7 and 8, the passage of which is at least four times larger than the passage of the inlet and outlet ducts 3 and 4. The upwards extending ducts 9 and 10 of the parts 7 and 8 open into the inlet and outlet apertures 5 and 6, respectively, in the bottom 2 of the tank, whilst the downwards extending ducts 11 and 1 2 are interconnected by a parallel duct 1 3. The passage of the parallel duct 1 3 corresponds to that of the parts 7 and 8.The parallel duct 1 3 comprises a cleaning aperture 1 5 which can be closed. The duct 9 of the inlet part 7 which opens into the inlet aperture 5 in the bottom of the tank is extended by means of a pipe 1 6 which projects into the tank 1 and which is preferably perforated.
A water reservoir 1 8 which serves as a heat exchanger projects from the top downwards through the lid 1 7 of the tank. The reservoir 1 8 comprises an inlet 1 9 for cold water and an outlet 20 for warm water. The upper part of the reservoir 1 8 which is situated outside the tank 1 accommodates an electric auxiliary heating system 21.
The tank 1 for waste water and the part of the reservoir 18 which projects outside the tank are surrounded by insulation 22. The flow rate is substantially reduced in the part 7, due to the increased passage, so that only the differences in density of the waste water are important for the further flow. If the flowing waste water is colder than the waste water already present in the tank 1, the colder water bypasses the tank through the parallel duct 13, i.e. the cold waste water leaves the outlet duct 4 without having been mixed with the warmer water in the tank 1.
If the incoming waste water is warmer than the waste water in the tank 1, an upwards flow arises in the part 7, so that the warm waste water rises into the tank 1, through the inlet aperture 5 and displaces colder water from the lower part of the tank 1 via the outlet aperture 6 and the outlet duct 4 in accordance with its temperature. The flow rate in the parallel duct 1 3 then remains zero until cold water is supplied again.
The waste water tank shown in Fig. 2 mainly corresponds to that shown in Fig. 1.
Therefore, corresponding parts are denoted by corresponding reference numerals. The waste water tank cooperates with a heat pump 23.
To this end, the lower part of the wall 14 of the tank 1 is surrounded by a coiled duct 24 which serves as an evaporator of the heat pump 23 and which is connected thereto via a liquid containing duct 25. Around the upper part of the reservoir 1 8 which is situated outside the tank 1 there is also provided a coiled duct 26 which is constructed as a condenser for the heat pump 23 and which is connected thereto via liquid containing ducts 27. As a result of this construction, the energy is directly recovered from the waste water in the upper part of the tank 1, whilst in the lower part of the tank it is recovered by means of the heat pump 23.

Claims (8)

1. A waste water tank, comprising a heat exchanger, a waste water inlet duct which is constructed as a fall pipe, and a waste water outlet duct which opens into the bottom of the tank, and which extends upwards outside the tank at least as far as the maximum filling height of the tank, characterised in that the inlet duct for the waste water also opens into the bottom of the tank and in that the inlet and outlet ducts changeover, at a small distance before the inlet and outlet apertures in the bottom of the tank, into parts having a passage which is at least four times larger than the passage of the inlet and outlet ducts, these parts being connected to the inlet and outlet apertures via upwards extending ducts and being interconnected by a parallel duct via downwards extending ducts.
2. A waste water tank as claimed in Claim 1, characterised in that the passage of the parallel duct corresponds to that of said parts.
3. A waste water tank as claimed in Claim 1 or 2, characterised in that the duct which opens into the inlet aperture in the bottom of the tank is extended into the tank over a given distance.
4. A waste water tank was claimed in any of the preceding Claims, characterised in that the inlet and outlet apertures in the bottom of the tank are spaced apart as far as possible.
5. A waste water tank as claimed in any of the preceding Claims, characterised in that the parallel duct comprises a cleaning aperture which can be closed.
6. A waste water tank as claimed in any of the Claims 1 to 5, characterised in that the heat exchanger is a water reservoir which projects into the tank from the top an inlet for cold water opening into the lower part of said reservoir.
7. A waste water tank as claimed in Claim 6, characterised in that the lower part of the wall of the tank is constructed as an evaporator of a heat pump or is connected to the evaporator by way of a liquid cycle, the upper part of the reservoir which is situated outside the tank being constructed as a condenser of the heat pump or being connected thereto by way of a liquid cycle.
8. A waste water tank substantially as hereinbefore described with reference to Fig.
1 or Fig. 2 of the accompanying drawings.
GB8004998A 1979-02-17 1980-02-14 Waste water tank for heat exchange Expired GB2049123B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792906096 DE2906096A1 (en) 1979-02-17 1979-02-17 WATER STORAGE

Publications (2)

Publication Number Publication Date
GB2049123A true GB2049123A (en) 1980-12-17
GB2049123B GB2049123B (en) 1983-03-30

Family

ID=6063140

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8004998A Expired GB2049123B (en) 1979-02-17 1980-02-14 Waste water tank for heat exchange

Country Status (7)

Country Link
JP (1) JPS55110890A (en)
CA (1) CA1130274A (en)
DE (1) DE2906096A1 (en)
FR (1) FR2453382A1 (en)
GB (1) GB2049123B (en)
IT (1) IT1140601B (en)
SE (1) SE443390B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324687A1 (en) * 1993-07-23 1995-01-26 Werner Hub Recovery of heat from waste water
GB2402204A (en) * 2003-05-21 2004-12-01 Villers Pierre De A heat exchanger for waste water
FR2970071A1 (en) * 2011-01-05 2012-07-06 Lyonnaise Eaux France Device for recovery of heat on columns of grey water in e.g. houses, has heat exchanger placed at level of upper part of grey water tank, where evacuation of cold water is provided at level below arrival of grey water via conduit
ES2449625R1 (en) * 2012-03-27 2014-12-04 Sedical S.A. Hydraulic system to recover heat energy from the outlet water of the pool vessel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1119442B (en) * 1979-10-30 1986-03-10 Fiat Ricerche PROCEDURE FOR HEATING WATER USED IN A APPLIANCE INSERTED IN A DOMESTIC HYDRAULIC CIRCUIT AND EQUIPMENT SUITABLE TO CARRY OUT SUCH PROCEDURE
FR2946127B1 (en) * 2009-05-26 2013-06-28 Commissariat Energie Atomique HEAT RECOVERY FROM WASTEWATER

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2307235A1 (en) * 1975-04-07 1976-11-05 Serete Water heating system for building - has temporary drain water storage tank containing evaporator of heat pump
DE2625157A1 (en) * 1976-06-04 1977-12-08 Bogner Und Huber Gmbh & Co San Heat recovery system from hot waste water - feeds storage from collector with heat exchanger and controlled drain valve
FR2381257A1 (en) * 1977-02-16 1978-09-15 David Jean Pierre Heat recovery system removing heat from waste water - by using it to heat up fresh water, domestic or industrial

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4324687A1 (en) * 1993-07-23 1995-01-26 Werner Hub Recovery of heat from waste water
GB2402204A (en) * 2003-05-21 2004-12-01 Villers Pierre De A heat exchanger for waste water
FR2970071A1 (en) * 2011-01-05 2012-07-06 Lyonnaise Eaux France Device for recovery of heat on columns of grey water in e.g. houses, has heat exchanger placed at level of upper part of grey water tank, where evacuation of cold water is provided at level below arrival of grey water via conduit
ES2449625R1 (en) * 2012-03-27 2014-12-04 Sedical S.A. Hydraulic system to recover heat energy from the outlet water of the pool vessel

Also Published As

Publication number Publication date
IT8019922A1 (en) 1981-08-14
FR2453382B1 (en) 1983-12-09
JPS55110890A (en) 1980-08-26
IT8019922A0 (en) 1980-02-14
DE2906096A1 (en) 1980-08-28
CA1130274A (en) 1982-08-24
GB2049123B (en) 1983-03-30
SE443390B (en) 1986-02-24
IT1140601B (en) 1986-10-01
SE8001148L (en) 1980-08-18
FR2453382A1 (en) 1980-10-31
DE2906096C2 (en) 1988-01-07

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PCNP Patent ceased through non-payment of renewal fee