Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1987-07-24
1990-02-06
Price, Carl D.
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
126362, 126374, 126389, 126437, 126419, 126421, 237 19, 122381, F24J 302
Patent
active
048981524
ABSTRACT:
The invention represents part of well known solar drain-back systems which store and transfer the collected solar heat to a conventional home hot water system. Heat transfer occurs only while hot water is being drawn, i.e. during water flow through heat exchangers located in a solar liquid storage tank. A thermally well insulated liquid storage tank receives heat by circulating the stored liquid over a conduit through solar energy collectors which are located such that gravitational drainage of the liquid back to the tank is assured. The unpressurized and vented liquid storage tank has external level indicator for seasonal changes of liquid storage volumes.
A pipe having heat exchange turns is located in the area above the highest of the variable liquid storage levels in the tank, the pipe and conduit are sealed to form a double pipe counterflow section. A pump when active, circulates the liquid from near the bottom of the tank to the solar heater and then to the conduit. When the pump is inactive, the liquid back-flows by gravity. A vacuum breaker located inside the tank, allows the back-flow to drain the solar heater and facilitates exchange of liquid and air or vapor from inside the tank by preventing vacuum lock.
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patent: 4397794 (1983-08-01), Manabo
patent: 4440152 (1984-04-01), Leflor et al.
patent: 4562828 (1986-01-01), Koshela
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