Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1990-12-10
1992-09-22
Ford, John K.
Heat exchange
Movable heating or cooling surface
Rotary drum
165 35, 165 76, 165 47, 165103, 165 66, 165143, 165909, 165158, 4545, F24J 300, F28D 700
Patent
active
051488582
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heat exchanger for heat energy-containing discharge water, for example used hot water from baths, showers etc., connected to a water discharge conduit preferably sloping obliquely downwards.
Hitherto it has been usual to allow the heat energy in used hot water from example bath tubs, shower installations and the like not only in conventional units of habitation, hotels, institutions of various types, but also in public baths and the like to disappear in the sewer together with the used hot water, In other words, in spite of high prices for thermal power, a large waste of heat energy has been accepted. A main reason for this has certainly resided in not having realised any possibility for the economic utilisation of the thermal energy content in the said used hot water.
With the present invention the aim is to produce a heat exchanger which is well suited for the purpose and which is functionable even after use over a long period.
The heat exchanger according to the invention is characterised in that the heat exchanger is defined in one or more water trap(s) coupled in parallel or series, which are arranged substantially horizontally at a level just below the water discharge conduit and which are coupled parallel to the water discharge conduit, the water trap having an inlet at an intake union connected upstream to the water discharge conduit for the used hot water and an outlet at a discharge union connected downstream to the water discharge conduit for the used hot water. In this construction the volume of fresh water of the heat exchanger, which is defined in one or more pipes mounted between opposite end covers of the water trap, largely corresponds or is somewhat smaller than the volume of discharge water of the water trap, and that the volume of discharge water of the water trap is preferably substantially greater than the volume of the water discharge conduit between its upstream end and its downstream end.
According to the invention there is the possibility to form in connection with the water trap a storage space for hot water designed for the supply of pre-heated, that is to say partially heated fresh water. Gradually, as the heated fresh water is drawn off from the hot water storage space for bath tubs, showers or other purpose, it can be refilled with a corresponding amount of partially heated fresh water from the heat exchanger. The volume in the water trap and in the pipes of the heat exchanger for fresh water must clearly be adjusted after each individual use application. The larger the flow is of used hot water in the water trap, the larger becomes the supply of heat to the pipes for the fresh water. With a smaller flow of used hot water a certain loss of heat to the suroundings can obviously occur.
If the water trap should cease to function for one or another reason, for example on stoppage by substances from the discharge water, there is hereby the possibility of allowing the discharge water to circulate freely and unhindered outside the water trap.
Further features of the invention will be evident from the following description having regard to the accompanying drawings, in which:
FIG. 1 shows a vertical section of a heat exchanger according to the invention in connection with a pipe section of a water discharge conduit.
FIG. 2 shows a section along the line 2--2 of FIG 1.
FIG. 3 shows an example of heat exchangers coupled in series in connection with a water discharge conduit.
FIG. 4 shows a part of FIG. 1.
In FIG. 1 there is shown a pipe section 10 of a water discharge conduit which communicates with one or more discharge pipes from baths, showers or similar hot water consuming equipment. The pipe section 10 constitutes an unregulated overflow for a water trap 11. The pipe section 10 is shown with an outline sloping obliquely downwards relative to a horizontal main axis 11a--11a of the water trap 11 which is arranged just below the pipe section 10. The pipe section 10 is provided at its upstream end 10a with a radially opening outlet opening 12 directe
REFERENCES:
patent: 1539267 (1925-05-01), Muhleisen
patent: 1841528 (1932-01-01), Gebhardt
patent: 1955477 (1934-04-01), Turner
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patent: 3048372 (1962-08-01), Newton, Jr.
patent: 3361194 (1968-01-01), Cowlin
patent: 3439738 (1969-04-01), Dixon et al.
patent: 3948315 (1976-04-01), Powell
patent: 4874035 (1989-10-01), Kashiwada et al.
Ford John K.
Hand Francis C.
Telavag Energiteknikk A/S
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