Stoves and furnaces – Tool having fluid fuel burner – Curling iron
Patent
1980-06-10
1983-01-18
Yeung, James C.
Stoves and furnaces
Tool having fluid fuel burner
Curling iron
126418, 137 59, F24J 302
Patent
active
043687245
ABSTRACT:
A protection device for automatically draining the water contained in a solar energy water heater in case of frost is a frost detector disposed externally of the heater, and includes a heat exchanger formed of a material having a good heat conductivity, preferably metal, secured to a small container filled with water through a bond having a good heat conductivity, and means responsive to a difference between the physical properties of water and ice, notably a variation in the density, and, therefore, a variation in volume and a variation in the electric resistivity. When the outdoor temperature has fallen below the water freezing point in this frost detector, the small volume of water contained in the small container is transformed into ice, and this icing is utilized for producing an electric signal controlling the draining of the heater. Conversely, when the temperature rises from a water icing value to an ice melting value, another signal is produced which differs from the former and causes the heater to be filled automatically with water to be utilized.
REFERENCES:
patent: 1924251 (1933-08-01), McGuire
patent: 4044754 (1977-08-01), Cronin et al.
patent: 4244352 (1981-01-01), Foster
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