Solar Air Heater Case Study

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Performance Study of A Solar Air Heater, Veena Pal, Ajeet Kumar Rai, Vivek Sachan, Journal Impact Factor (2015): 8.8293 Calculated by GISI ( 1 1Department of Mechanical Engineering, SSET, SHIATS-Allahabad, UP. India. ABSTRACT In the present work an attempt has been made to experimentally investigate the performance of a flat plate solar air heater. Experiments were performed to find the energy and exergy efficiency at different mass flow rate of air. It is observed that for a 16% increase in mass flow rate of air, energy efficiency increases by 20%, whereas exergy efficiency increases by 36%. INTRODUCTION Solar air heater is widely used because it is simple in design, and easy to fabricate, easy to maintain and it required…show more content…
Exergy efficiency of SAH system has been evaluated in terms of the net output exergy of the system. The second law efficiency is calculated as follows: (20) RESULTS AND DISCUSSIONS Fig. 2 shows variation in solar intensity for different days when mass flow rate of air taken as 0.036, 0.039 and 0.042 kg/s.Fig.3 shows the variation in wind speed for these days. Fig.4 shows variation of temperature difference of air from outlet to inlet. This is high for higher value of mass flow rate. Fig. 5 shows variation in energy efficiency at different mass flow rate. The daily energy efficiency of 46.65% is obtained with lower mass flow rate 0.036 kg/s. When mass flow rate increases to 0.039 kg/s energy efficiency is 51.35%, maximum of 56% daily efficiency is obtained with mass flow rate of 0.042 kg/s. A maximum instantaneous efficiency of 91% is obtained with 0.042 kg/s for lower solar intensity I (t). The effect of mass flow rate is minimized at low solar intensity. Fig.6 shows the exergy efficiency at different mass flow rate.

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