1. ASHRAE Standard 93–1986, Methods of testing—to determine the thermal performance of solar collectors, ASHRAE Publications, New York, USA.
2. Heating of swimming pool water in Lauenau;Croy,1990
3. Heating of swimming pool water in Spenge;Rehrmann,1990
4. A recommended test method for determining the thermal performance of unconvered solar collectors;Soltau,1988
5. ASHARAE Standard 96–1980, Methods of testing—to determine the thermal performance of unglazed flat-plate liquid-type solar collectors, ASHRAE Publications, New York, USA.