Experimental Comparative Study between a Simple Roof Concrete and Roof Solar Cells Chimney Assisted with DC Fan and Life Cycle Cost Analysis

This paper reports experimental comparative study between a Simple Roof Concrete (SRC) and Roof Solar Cells Chimney assisted with DC fan (RSCC) and Life Cycle Cost Analysis. The RSCC consisted of double roof. Its dimensions of area were 0.56 m 2 with 50WP external roof, 0.015 m thick solar cells panel, 0.015 m thick red color CPAC Monier and 0.07 m thick autoclave aerated concrete panel internal roof, 0.01 m air gap. Openings located at the bottom was 0.15 x 0.70 m 2 assisted with 5.76 WP DC fan (room side) and at the top was 0.10 x 0.3 m 2 (ambient side). RSCC was installed at the south facade of two small houses of the same dimension, 4.05 m 3 volume made from autoclaved aerated concrete. Then the comparison of performance between SRC and RSCC for reducing thermal heat gain of ceiling, using another small house model, was studied. The experimental results revealed that indoor temperature of RSCC room and air indoor under roof was 0.2 – 6oC lower than that of the SRC room. This ventilation reduced heat gain admitted through the south roof considerably. Moreover, according to the economic analysis between the Roof Solar Cells Chimney and the Simple Roof Concrete it was found that their payback periods are 32.7 and 61.8 years; rates of return are 37 and 34% per annum. The RSCC is expected to promote solar energy use, save cooling energy and protect environment and is more appropriate for an investment.