Document Type : Original Article
Department of Mechanical Engineering, University of Sistan and Baluchestan, Zahedan, Iran
In this paper, the experimental investigation of cascade solar still and the cascade solar still connected to photovoltaic thermal
collector is carried out. First, cascade solar still is constructed. Its tile angle is adjusted in 30 degree tangential situation on the
ground. All experiments are done in the climate conditions of Zahedan thermal power plant for the spring season. The experimental
data have been measured through two consecutive days. Due to good heat transfer between the photovoltaic panel and copper pipes,
the output electrical power of photovoltaic panel has been increased. In the primary times of day, the efficiency of cascade solar still
and the one connected to photovoltaic thermal collector is the same because of the low value of ambient temperature and solar
radiation intensity. But at the noon (12:00 pm), the efficiency of cascade solar still connected to photovoltaic thermal collector is
nearly 20 percent higher than simple cascade solar still due to the high value of ambient temperature and solar radiation intensity.
Photovoltaic thermal collector has been used in order to supply the required DC electrical power of relay center of Zahedan power
plant and the needed electrical power for circulating brackish water through the system.