EP0035994A4 - Heat recovery system. - Google Patents
Heat recovery system.Info
- Publication number
- EP0035994A4 EP0035994A4 EP19800901047 EP80901047A EP0035994A4 EP 0035994 A4 EP0035994 A4 EP 0035994A4 EP 19800901047 EP19800901047 EP 19800901047 EP 80901047 A EP80901047 A EP 80901047A EP 0035994 A4 EP0035994 A4 EP 0035994A4
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat exchanger
- heat
- scroll
- plys
- dome
- 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
Links
Classifications
-
- 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
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/0005—Recuperative heat exchangers the heat being recuperated from exhaust gases for domestic or space-heating systems
- F28D21/0007—Water heaters
-
- 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
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/04—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by spirally-wound plates or laminae
Definitions
- My invention is a system of mechanical apparatus for the recovery of waste heat from smokepipes, chimneys or stacks using natural draft.
- Prior means for improving the heat output of natural draft stoves, boilers, furnaces or fireplaces have made use of the following means: air blown through tubular grates set in the fire; heat exchanger and fan units have been mounted in the smokepipe (Magic Heat); thermal wheels have been used in large capacity commercial applications (Ljungstrom Air Preheater Co.); literature describes the horizontal phasechange heat pipes. Prior art is all limited by the need to keep the stack temperatures hot enough - and thus wasteful - to maintain adequate draft.
- My invention uses a special heat exchanger mounted on a stack or chimney and baffled so that the gases go up thru the core and down thru the exchanger before release to the atmosphere.
- the reclaimed heat is transferred to liquid which is circulated to just those areas where it is desired.
- the heat obtained from fireplaces and stoves is greatly increased and without the aesthetic violence of blowers, heat tubes, or the sheer physical bulk of surface.
- Some metals in the stainless steel series while they are acid resistant, have poor thermal conductivity and thus do not lend themselves to fabrication as finned tubing where the heat travel is a relatively long path.
- Sheet 1 of the drawings shows a vertical section thru the equipment and a schematic of the other system elements.
- the exchanger unit either sits on top of a leveled masonry chimney or is supported to embrace a flue.
- the basic elements are: a torus shaped condensate pan (l); a heat exchanger scroll (2); a jacket around the scroll (3); a hinged cap (4) which is tensioned to open by a spring; the cap incorporates a dome (5) and a filler cap (6); short flexible hoses lead from the exchanger outlet (7) to the dome and from the dome (8) down to piping which leads to a pump; hose (9) runs to tubing which leads to bottle (10).
- the pump circulates the heated water through any conventional heating system or device, such as baseboard heaters, convectors, radiators, unit heaters, etc. or even to a hot water storage tank. This, via supply line (11) and return (12).
- any conventional heating system or device such as baseboard heaters, convectors, radiators, unit heaters, etc. or even to a hot water storage tank. This, via supply line (11) and return (12).
- Bottle (10) is open and sized to hold the volume of liquid displaced by expansion plus the small volume in dome (5).
- the liquid in the dome is expelled automatically upon the generation of any steam - as would follow upon any power failure.
- the cap, now unloaded, is opened by the aforementioned spring.
- the exchanger is by-passed and no liquid is boiled off or wasted out of the system.
- Sheet 2 of the drawings shows the construction of the heat exchanger itself. This begins as a two ply sandwich of metal strip (figure 1); these are embossed, fitted with liquid connections and rolled into a spiral scroll (figure 3); the scroll is inserted into the jacket (figure 4 ) which protects the scroll from abuse and resists the "hoop stress" or the spring back of the scrol 1. Best Mode For Carrying Out The 1 nve ⁇ t ion
- One set of rolls impresses shallow tits to the interior of the sandwich (21); the other set of rolls impresses larger and wider spaced dimples to the outside of the sandwich (22).
- the small tits establish a liquid channel and will be on the concave face of the scroll; the larger dimples maintain a gap for the gases. Both patterns serve to rigidize and strengthen a metal gauge chosen for economy and light weight.
- the edges of the lapped sheets are run thru the wheels of a resistance seam welder or a high frequency resistance welder.
- the skew cut (fig. 5) is parallel with the dimples and the liquid connection cuff (24) is inserted here.
- This piece is bench welded by Tungsten Inert Gas with filler metal, or alternately by Metal Inert Gas wire feed to embrace the half nipple (23).
- This cuff is a heavier gauge, say, .0375 inch (1mm plus).
- the cuff wraps around the nipple but gradually blends off in a tapering run until it is pinched flat at the other end (24).
- a machine seam is run across the skew to join the thin skins to the heavier cuff, with a temporary copper chill sheet inserted (25) thru the end of the sandwich and then withdrawn and the end welded shut.
- the top nipple, the outlet nipple should not be inserted deeper than 1 cm. into the sandwich. The whole is now rolled into a spiral scroll and leak tested. If quality control has been good, the scroll should be inserted into the jacket and then tested. The test is made by admitting only low pressure air to one of the ports with the other capped, and submerged in lukewarm water with a wetting agent added.
- the interior of the jacket should have no sharp edges or protrusions to gouge the exchanger scroll which may be withdrawn for ease of c l ean ⁇ ng .
- Connection (13) is a stub tube inserted low so that condensate may be drained off if desired.
- a weatherproof, snap-acting thermostat set for 140° F (60° C) is surface mounted on the exterior of the jacket anywhere close under the cap - preferably near the hinge. This is to start and stop the pump when a manual-automatic switch is set to automatic position.
- the dome (5) has three functions: it is an air-separation chamber where air swept out from anywhere in the whole heating system will be trapped out; it has a small superheating effect; it is an unloader to prevent boiling off liquid if the power supply were interrupted or the heating system could not absorb as much heat as was produced. If steaming occurs, the liquid in the dome is forced out via hose (9) to small diameter tubing which runs to bottle (10) thru check valve (14) which has a controlled leak in the reverse flow direction. When vapor condenses in the dome, it allows the return of liquid over a period of say half an hour to overcome the spring and again test for excessive heat. Incidentally, the cap in an open position without any firing going on, is a signal of air in the system to be bled out.
- the liquid in the heating system can well be clean, filtered rain water with only enough ethylene glycol type anti-freeze added to protect against minimum temperatures. This does not preclude other precautions against freezing which can be used.
- the pump of choice selected for prototype models may be of interest. It is not universally known that small centrifugals a re available with magnetically coupled drives which eliminates weeps from stuffing boxes or mechanical seals which may develop over years of service. Such pumps also protect themselves in that the impeller declutches should grit from a dirty piping system be entrained.
- PE/NE future fuel costs as % of PFC; and when worked out for typical usages we have:
- Wood, stove 50% / 95% .526
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7402079A | 1979-09-10 | 1979-09-10 | |
US74020 | 1979-09-10 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0035994A1 EP0035994A1 (en) | 1981-09-23 |
EP0035994A4 true EP0035994A4 (en) | 1982-07-12 |
EP0035994B1 EP0035994B1 (en) | 1984-04-11 |
Family
ID=22117205
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19800901047 Expired EP0035994B1 (en) | 1979-09-10 | 1981-03-23 | Heat recovery system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0035994B1 (en) |
DE (1) | DE3067413D1 (en) |
WO (1) | WO1981000760A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB201402193D0 (en) * | 2014-02-07 | 2014-03-26 | Laberge Sylvain | Baseboard for use in preheating water |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124197A (en) * | 1964-03-10 | Addmxnal spaces in home a | ||
DE1913226B1 (en) * | 1969-03-15 | 1970-08-27 | Krupp Gmbh | Heat exchanger consisting of hollow disks |
FR2344804A1 (en) * | 1976-03-17 | 1977-10-14 | Fimec | Household ventilation system heat recuperator - has concentric tubes forming meander paths for hot stale air and cold fresh air |
US4066210A (en) * | 1975-05-20 | 1978-01-03 | Pemberton Alonza R | Chimney heat reclaimer |
DE2733590A1 (en) * | 1977-07-26 | 1979-02-01 | Balcke Duerr Ag | Cylindrical shell heat exchanger with cylindrical core - uses strips with longitudinal corrugations placed shells forming flow paths |
DE2901690B1 (en) * | 1979-01-17 | 1979-10-25 | Otto Geb Kg | Cover for chimneys |
DE2935543A1 (en) * | 1979-09-03 | 1981-03-19 | Dieter Pomplun | Movable chimney cover assembly - comprises motor driven cowl with pipes and insulating covering controlled by burner |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2663549A (en) * | 1950-07-14 | 1953-12-22 | Griscom Russell Co | Spiral heat exchanger |
US3278122A (en) * | 1964-03-02 | 1966-10-11 | Laing Vortex Inc | Central heating systems |
FR2313650A1 (en) * | 1975-06-05 | 1976-12-31 | Bertin & Cie | COMPACT HEAT EXCHANGER FOR FLUIDS |
-
1980
- 1980-04-18 DE DE8080901047T patent/DE3067413D1/en not_active Expired
- 1980-04-18 WO PCT/US1980/000443 patent/WO1981000760A1/en active IP Right Grant
-
1981
- 1981-03-23 EP EP19800901047 patent/EP0035994B1/en not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124197A (en) * | 1964-03-10 | Addmxnal spaces in home a | ||
DE1913226B1 (en) * | 1969-03-15 | 1970-08-27 | Krupp Gmbh | Heat exchanger consisting of hollow disks |
US4066210A (en) * | 1975-05-20 | 1978-01-03 | Pemberton Alonza R | Chimney heat reclaimer |
FR2344804A1 (en) * | 1976-03-17 | 1977-10-14 | Fimec | Household ventilation system heat recuperator - has concentric tubes forming meander paths for hot stale air and cold fresh air |
DE2733590A1 (en) * | 1977-07-26 | 1979-02-01 | Balcke Duerr Ag | Cylindrical shell heat exchanger with cylindrical core - uses strips with longitudinal corrugations placed shells forming flow paths |
DE2901690B1 (en) * | 1979-01-17 | 1979-10-25 | Otto Geb Kg | Cover for chimneys |
DE2935543A1 (en) * | 1979-09-03 | 1981-03-19 | Dieter Pomplun | Movable chimney cover assembly - comprises motor driven cowl with pipes and insulating covering controlled by burner |
Non-Patent Citations (1)
Title |
---|
See also references of WO8100760A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0035994A1 (en) | 1981-09-23 |
DE3067413D1 (en) | 1984-05-17 |
WO1981000760A1 (en) | 1981-03-19 |
EP0035994B1 (en) | 1984-04-11 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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