# US 4,392,481 A · Solar collector apparatus having increased energy rejection during stagnation

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- Number: US 4,392,481 A
- Document ID: US4392481A
- Status: Granted
- Kind: A
- Application number: 06/225,493
- Filed: 1981-01-16
- Granted: 1983-07-12
- Earliest claimed: 1981-01-16
- Assignees: The United States of America as represented by the United States Department of Energy
- Inventors: Stanley W. Moore
- Web page: https://patentgrep.com/patent/US4392481A

## CPC

- F24S 40/50: Preventing overheating or overpressure (by draining the working fluid F24S40/60)
- F24S 10/501: {having conduits of plastic material}
- F24S 80/525: made of plastics
- F24S 80/56: characterised by means for preventing heat loss
- Y02E 10/44: Heat exchange systems
- F24S: SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS (for producing mechanical power from solar energy F03G6/00)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The disclosure relates to an active solar collector having increased energy rejection during stagnation. The collector's glazing is brought into substantial contact with absorber during stagnation to increase re-emittance and thereby to maintain lower temperatures when the collector is not in operation.

## Claims

### Claim 1

An apparatus for temperature limiting a solar collector comprising:
an absorber;
a layer of insulation disposed beneath said absorber;
glazing disposed over said absorber, said absorber and said glazing being constructable from materials incapable of withstanding temperatures above about 180.degree. F. for an extended period of time, said glazing comprising the topmost layer of said apparatus and said glazing being heat mirror coated to give it a low .epsilon. inner surface to eliminate radiation and convection resistance during stagnation periods; and
means for spacing said glazing away from said absorber during operation of said collector and for bringing said glazing substantially in contact with said absorber during stagnation to substantially increase energy convected and re-emitted from said collector, thereby maintaining a temperature below about 180.degree. within the said apparatus during stagnation.