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Apparatus for solar hot water system and method of making same
| Details |
Inventors: Goolsby, Patrick F.;
Assignee: Reynolds Metals Company (Richmond, VA)
Primary Examiner: Sprague; Kenneth W.
Assistant Examiner: Yeung; James C.
Attorney, Agent or Firm: Glenn, Lyne, Girard, Clark and McDonald
Apparatus for heating and maintaining the temperature of water in a hot water tank of a solar hot water system and method of making same are provided wherein such apparatus comprises a thermally insulating container disposed around and in spaced relation from the tank with the container having a bottom portion defining a sump for a heat transfer liquid employed in the system and a device for maintaining the level of such liquid in the sump beneath the tank during normal system operation to thereby assure maintenance of an air space substantially completely around the tank with the air space cooperating with the insulating container to assure the temperature of water in the tank is maintained with minimum loss; and, the apparatus may also employ a pressure sensitive shut-off device in the cold water supply to the tank which cooperates with the air space to assure operation of the system with substantially no likelihood of contamination of the cold water supply. |
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DETAILED DESCRIPTION What is claimed is: 1.
In a solar hot water system having a collector subsystem; a hot water storage subsystem having a hot water tank; an energy transport subsystem operatively connected between said collector and hot water storage subsystem and including a heat transfer liquid; apparatus for heating and maintaining the temperature of water in said tank; and a control subsystem for said subsystems and apparatus; the improvement wherein said apparatus for heating and maintaining the temperature of water in said tank comprises, a thermally insulating container disposed around and in spaced relation from said tank, said container having a bottom portion defining a sump within said container for said heat transfer liquid, and a device for maintaining the level of said liquid in said sump beneath said tank during normal operation to thereby assure maintenance of an air space substantially completely around said tank, said air space cooperating with said insulating container to assure the temperature of water in said tank is maintained with minimum loss.
2.
A solar hot water system as set forth in claim 1 in which said tank has a bottom wall, a top wall, and a side wall connected between said bottom and top walls and wherein said apparatus further comprises means introducing said liquid against said top wall enabling gravity flow thereof as a film along said top wall and side wall to thereby provide optimum heat transfer between said liquid and said walls and thus optimum heating of said water.
3.
A solar hot water system as set forth in claim 2 wherein said introducing means comprises a pan supported above said tank for receiving said liquid therein, said pan being disposed so that upon filling thereof liquid overflows therefrom onto said top wall.
4.
A solar hot water system as set forth in claim 2 wherein said device comprises a liquid discharge port in said container beneath said bottom wall of said tank.
5.
A solar hot water system as set forth in claim 4 wherein said device includes an open sight tube in flow communication with said liquid discharge port
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