Experimental Investigation of a Cascade Solar Still Connected to a Photovoltaic Thermal Collector at Zahedan Thermal Power Plant


Abstract:

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.

Keyword: Solar energy, cascade solar still, photovoltaic thermal collector, energy analysis, thermal efficiency

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