DOI: 10.5937/jaes0-37006
This is an open access article distributed under the CC BY 4.0
Volume 20 article 1022 pages: 1175-1183
Using solar energy to cover heating loads of building is a clean and unconventional way that can help reduce electricity consumption. Problems of the cost of energy and environmental pollution are among the most important challenges facing humanity at the present time. And as most of the energy is used for heating and ventilation, thus the need to find renewable sources of energy has become a pressing need. In this direction Trombe wall, which is a classical passive solar wall, has become one of the most important heating and ventilation technologies of buildings. In the present work a three-dimensional numerical study of thermal energy performance for Trombe wall utilizing paraffin wax as PCM was presented. The effect of PCM thickness was studied as (2, 3, 4 and 5 cm). A FORTRAN-90 computer program was built to solve a three-dimensional, turbulent Navier stokes and energy equations in addition to enthalpy transforming method for PCM with explicit scheme based on finite volume method. Numerical results of the present code were validated by comparing them with previous experimental results and a good agreement was noted. The results show that a 2 cm thick PCM is an optimal thickness, where the percentage rates of increasing in air temperature over ambient temperature at day hours (10 am, 12 pm, 5 pm, 10 pm and 7 am of the next day) were (37.8, 19.5, 30.7, 60 and 69.2%) respectively, compared to (33.5, 15.2, 25.9, 53.3 and 65.3) % respectively for a 5 cm wax calculated at the same hours.
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