Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
  • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
  • F24H1/18—Water-storage heaters
  • F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
  • F24H1/208—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with tubes filled with heat transfer fluid
• • 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
  • F24D17/0005—Domestic hot-water supply systems using recuperation of waste heat
  • F24D17/001—Domestic hot-water supply systems using recuperation of waste heat with accumulation of heated water
• • 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
  • 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
• • 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]
  • Y02B30/18—Domestic hot-water supply systems using recuperated or waste 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
  • 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

Definitions

• the present invention relates to a method and an apparatus for transferring heat from waste water from a building to service water to the building by utilizing the heat pipe principle.
• Heat pipes have been used in many applications. including both cooling and heating. Heat pipes are built up as a closed circulation system, in which the heat is transported continuously by means of a volatile heat transferring medium from one place, the vaporization place, to another place, the condensation place, in the system. The heat transferring medium is self-circulating; no pump is required. If the condensation place is located at a higher level than the vaporization place, the heat transport can only take place in one direction, namely from below and upwards.
• the present invention relates to a method for transferring heat from the waste water of a building to its incoming service water by means of a heat transferring medium self-circulating in a closed pipe system between a vaporization place, through which the waste water flows, and a condensation place, through which the service water flows and which is located at a higher level than the vaporization place, wherein the transferring medium is vaporized at the vaporization place and flows from this place in vapor phase to the condensation place, is condensed at the condensation place during heat emission for said heat transfer and flows in fluid phase back to the vaporization place.
• the present invention is an improvement of such a method in order to essentially increase the efficiency of the heat transfer.
• a number of experiments with different embodiments for utilizing such a method have proved, that the configuration of the vaporization place, i.e. the heat transfer from the waste water, is of particularly importance to the efficiency, and the present invention provides for said purpose a special method for this heat transfer.
• the present invention is characterized by feeding the waste water to the vaporization place where there are substantially undisturbed layer zones comprising layers of temperature in the waste water with the top layer being warmer than the bottom layer and transferring heat from the waste water to the heat transferring medium in said layers independent of each other.
• the absorption of heat from the waste water shall according to the invention take place in at least two layers (level zones).
• a natural zoning of warm water uppermost and cold water towards the bottom takes place in a vessel, unless flows disturb this zoning. It is accordingly in order to obtain the required zoning essential, that such disturbing flows which result in a mixing of the upper warmer waste water with the lower cold waste water are avoided.
• the inflow of the waste water must therefor, according to the invention, take place in such a manner, that the waste water has the possibility to be zoned.
• the waste water should be fed into the vaporization place below the level of the waste water therein and in a preferred method, according to the invention, the waste water is for zone-promoting purposes supplied to the vaporization place in a substantially horizontal direction, wherein moreover the waste water preferably is supplied tangentially.
• the kinetic energy of the waste water should also be damped immediately before or at the intake into the vaporization place.
• the heat transfer takes place in each of said zones along a substantially horizontal plane.
• the condensate of the heat transferring medium should accumulate covering a relatively large area in said plane so that the vaporization of the heat transferring medium is promoted.
• the present invention also relates to an apparatus for carrying out the method.
• the apparatus according to the invention includes a waste water vessel, a service water vessel located at a higher level than the waste water vessel and a self-circulating heat transferring medium in a closed pipe system between said vessels.
• the apparatus according to the invention is characterized by layer-promoting means to obtain essentially undisturbed zoning into temperature layers in the waste water vessel with an upper layer zone of warmer waste water than the lower layer zone and at least two separate pipe circuits for the heat transferring medium arranged with the heat-absorbing parts of the pipe circuits in the waste water vessel spaced apart vertically with at least one of said pipe circuit parts in each layer zone.
• said layer- promoting means for the incoming waste water comprises of a tangentially connected inlet pipe, preferably having a channel in the wall of the vessel successively leading into the vessel.
• said layer-promoting means comprises of a partition wall extending into the waste water vessel substantially horizontally, said wall covering an essential part of the inner area of the vessel. The partition wall is located such that it separates the zones in which the heat absorption to said pipe circuits takes place.
• said heat-absorbing pipe circuits in the waste water vessel are formed as a substantially plane spiral.
• Such a plane spiral utilizes the pipe length effectively due to the fact that condensate is present in the total pipe length in the spiral.
• Figure 1 is a vertical section through the preferred embodiment
• Figure 2 is a section along II-II in Figure 1.
• a waste water vessel 1 is arranged for receiving waste water from a building that has valuable heat content, such as, for example, the discharge from clothes washing machines, dish washing machines, bathrooms and the like.
• the waste water is conducted into the vessel as shown by the arrow A and is discharged at the bottom of the vessels as shown by the arrow B.
• the waste water supplied to the vessel through the vertical pipe 2 looses a part of its kinetic energy when it meets the waste water level in the pipe 2 and also by the perpendicular deflection to the horizontal in tangential inlet 3.
• the waste water can after entering vessel 1 be zoned so that waste water that is warmer than that inside the inlet 3 rises on entering the vessel and colder waste water sinks downward, and this takes place without disturbing the zoning.
• heat pipe loops 4a and 4b are each arranged in a substantially horizontal plane.
• the pipe loops are preferably formed as a substantially plane spiral.
• the outlet for the waste water may preferably be formed as a level-maintaining device and such a device is shown in Figure 1 as an Outlet pipe 5 having the outlet opening positioned at a desired level in the waste water vessel 1.
• a wall or pipe 6 shields the outlet opening of the pipe 5 so that only the colder bottom water flows to the outlet.
• An upper vessel 7 is positioned at a higher level above the waste water vessel 1. Heat from the warm waste water flowing through the waste water vessel shall be transferred to the contents of vessel 7.
• Vessel 7 can for instance be a water heater or the contents of the vessel can be fresh water coming into the building, the fresh water of which shall be pre-heated.
• the fresh water enters the vessel at the bottom as shown by the arrow C and is discharged at the top as shown by the arrow D.
• the heat pipe loops 4a, 4b in the waste water vessel are connected to screw-line-formed loops 8a, 8b in the fresh water vessel.
• Distilled water, freon, ammonia or like liquids having high vaporization heat are used as heat transferring medium in these heat pipe loops.
• the amount of medium is adapted such that optimum heat transfer effect is obtained.
• the air is evacuated so that only the pressure of the heat transferring medium in the pipe is present for the respective temperature.
• the pipes should be made of metal, for instance copper.

Landscapes

• Engineering & Computer Science (AREA)
• Thermal Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Heat Treatment Of Water, Waste Water Or Sewage (AREA)
• Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
• Steam Or Hot-Water Central Heating Systems (AREA)
• Sorption Type Refrigeration Machines (AREA)
• Air Bags (AREA)
• Interface Circuits In Exchanges (AREA)
• Central Heating Systems (AREA)
• Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20339598

Family Applications (1)

Country Status (9)

Cited By (2)

Citations (1)

• 1979
  • 1979-12-19 SE SE7910472A patent/SE420018B/sv unknown
• 1980
  • 1980-12-19 DE DE8181900151T patent/DE3068752D1/de not_active Expired
  • 1980-12-19 EP EP81900151A patent/EP0047748B1/en not_active Expired
  • 1980-12-19 AT AT81900151T patent/ATE8703T1/de not_active IP Right Cessation
  • 1980-12-19 JP JP81500332A patent/JPS56501772A/ja active Pending
  • 1980-12-19 WO PCT/SE1980/000342 patent/WO1981001874A1/en active IP Right Grant
• 1981
  • 1981-08-12 FI FI812488A patent/FI63289C/fi not_active IP Right Cessation
  • 1981-08-13 NO NO812744A patent/NO812744L/no unknown
  • 1981-08-18 DK DK365781A patent/DK365781A/da not_active Application Discontinuation

Patent Citations (1)

Also Published As

Similar Documents

Legal Events