Paper Conference

Proceedings of eSim 2010: 6th Conference of IBPSA-Canada

     

SIMULATION COMPARISON BETWEEN NATURAL AND HYBRID VENTILATION BY FANS AT NIGHT TIME FOR SEVERE HOT CLIMATE (ASWAN, EGYPT)

A. Rizk, A. El-Deberky, N. M. Guirguis

Abstract: The computer simulation measures the effect of ceiling and wall fans in decreasing air temperature during night time. The indoor temperature exceeds the thermal comfort through overheated period in Aswan. High time lag of envelope at the day time increase the indoor temperature at the night time. As a result, the indoor temperature becomes higher than the outdoor temperature at the night time of the overheated period. The simulation study consists of three models according to ventilation conditions (types). The first model that depends on cross ventilation only is called natural ventilation model. The second model is hybrid ventilation that consists of natural ventilation (cross ventilation) and mechanical ventilation (ceiling fan). The third model is using wall (side) Fan instead of ceiling fan. The boundary conditions are put according to Aswan weather in overheated period (July). Simulation results of hybrid ventilation models decreased indoor temperature from 2 ºC to 4ºC. The wall (side)(average indoor air velocity in case of wall fan equals 1 m/s) is better than ceiling fan)(average indoor air velocity in case of ceiling fan equals 0.86 m/s) according to decreasing indoor temperature (4ºC) and air flow is well-distributed inside the room at sitting level.
Pages: 216 - 223
Paper:
esim2010_NP1_216_223