Efficiency of the thermal hybrid solar collector in the south of Siberia

The task of the study was to determine the maximum possible efficiency of thermal hybrid solar collectors when used in the south of Siberia. To do this, the nodal points and the efficiency of the organic Rankine cycle were calculated at the temperatures of the photovoltaic panel equal to 25 °C, 50 °C, 75 °C and 100 °C, plots of the dependence of the efficiency of the photovoltaic panel, the efficiency of the organic Rankine cycle and the efficiency of the thermal hybrid solar collector on temperature of the photovoltaic panel. The efficiency of the organic Rankine cycle at PV panel temperatures of 25 °C, 50 °C, 75 °C and 100 °C is 5,3%, 11,5%, 16,8% and 21,3%, respectively. The efficiency of a photovoltaic panel at its temperatures of 25 °C, 50 °C, 75 °C and 100 °C is 17%, 14,9%, 12,8% and 10,6%, respectively. The efficiency of a thermal hybrid solar collector at PV panel temperatures of 25 °C, 50 °C, 75 °C and 100 °C is 22,3%, 26,4%, 29,6% and 31,9%, respectively. The article substantiates the choice of ammonia (R717) as a low-boiling working fluid in the organic Rankine cycle. It is shown that the maximum possible efficiency of a thermal hybrid solar collector, equal to 31,9%, is achieved at a photovoltaic panel temperature of 100 °C. Based on the results of the work, it was concluded that the maximum possible amount of energy that can be obtained per year in Novosibirsk from 1 m² of a thermal hybrid solar collector following the sun is 856,5 kW·h; the maximum possible amount of energy that can be obtained per year in Novosibirsk from 1 m² of a stationary thermal hybrid solar collector is 585,4 kW·h.

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