Heat gain reduction through ceiling by PV ventilation system
Keywords:
PV ventilation system, Heat transfer, The convective heat transferAbstract
The objective of this research is to study heat gain reduction and convective heat transfer through the ceiling by PV ventilation system. The roof of the test house is an angle of 30 degrees. The dimension of the room as (W:1×L:1 ×H:1 m). The results indicated that the attic temperature is 47-48ºC. The upper ceiling surface temperature of reference house is 44.5ºC, which is higher than the test house 3.2ºC. The bottom ceiling surface of the test house has a maximum temperature of 41.5ºC. The maximum temperature difference at the bottom ceiling surface is 4.3ºC. From heat transfer through the ceiling, the house was equipped with a PV ventilation system shown lower temperature values. The highest room temperature difference of both houses is 4.2 ºC. The number of air changes (ACH) is 127-132 m3/hr. The convective heat transfer of the house with PV ventilation system is lower than the reference house throughout the day about 190 W/m2. K. The average percentage of heat gain reduction through the ceiling during the day is 30-34%. The result of installing a PV ventilation system can reduce the amount of heat accumulated in the house.
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