Refrigeration – Automatic control – Gas-liquid contact cooler – fluid flow
Patent
1987-06-24
1988-08-09
Wayner, William E.
Refrigeration
Automatic control
Gas-liquid contact cooler, fluid flow
622594, 374136, F28D 300
Patent
active
047619651
ABSTRACT:
An evaporative roof cooling system for placement upon a roof surface exposed to relatively high levels of solar radiation. The system includes water distribution piping and a plurality of mist/spray nozzles positioned on the roof surface for supplying a uniform spray of water thereover to lay down a substantially uniform thin film of water on the roof surface. A solenoid-controlled valve controls the supply of water to the system over periods during which the temperature of the roof surface is measured to be within a predetermined temperature range. A thermistor, encapsulated in an expoxy block, is affixed to the roof surface and monitors and measures the actual roof temperature. Cooling systems control circuitry, in electric communication with the thermistor and the solenoid-controlled valve, compares the electric resistance value developed by the thermistor and a range of current values related to the predetermined temperature range and directs the opening of such valve when the termister senses the high point temperature of such range and the closing of such valve when the thermister senses the low point temperature of such range whereby the mist/sprays of water discharged from the nozzles evaporatively cool the roof surface.
REFERENCES:
patent: 1386618 (1921-08-01), Hartnig
patent: 2266321 (1941-12-01), Holder
patent: 2506936 (1950-05-01), Murray
patent: 3861624 (1975-01-01), Lear
patent: 4559789 (1985-12-01), Riek
Junkins Philip D.
Wayner William E.
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