Assessment of domestic evacuated tube direct solar water heater

Abstract

[Abstract]: This work presents the first assessment results of an evacuated tube solar collector at the Christchurch Polytechnic Institute of Technology. The assessment includes, a quantification of the capacity of heated water that could be supplied at different solar conditions and the realized energy savings (kWh), an interpretation of the working efficiency of the collector at different solar radiation and ambient temperatures. This paper presents a summary of the results achieved to date and outlines possible future developments that may be necessary to allow this type of direct solar water heater to be deployed in NZ conditions.