Effect of Air Channel Depth and Mass Flow Rate on the Efficiency of Hybrid Thermal - Photovoltaic Sensor
DOI:
https://doi.org/10.21152/1750-9548.12.2.147Abstract
We present in this paper the effect of the mass flow rate and air channel depth on the efficiency of hybrid thermal-photovoltaic sensor. A numerical simulation of the performance of the thermal-photovoltaic sensor with a heat exchanger including fins attached to the absorber and using air as a coolant is presented. A thorough analysis of the mass flow rate, and air channel depth influence on the efficiency and the working of the system are examined. We use the heat transfer equations cascade of the components as a matrix of four unknown’s temperatures, which are the glass, cells, fluid and insulation plate temperatures. To solve this matrix, the fixed point and Gauss-Seidel method, at the transitory regime are used. Results at solar irradiance of 1120 W/m2 show that the combined thermal-photovoltaic efficiency is increasing from 60% to 75% and the mass flow rate necessary to maintain the cells at a constant temperature is decreasing form 1.8 to 1.2 Kg/s, when the exchanger channel depth varies from 0.35 to 0.05 m. The overall conversion efficiency of the system increases from 25% to 60%, and the cell temperature decreases from 345K to 335K when mass flow rate changes from 0.02 kg/s to 0.1 kg/s.
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