Abstract
Abstract In the present paper, design of solar chimney (SC) and earth-to-air heat exchanger (EAHE) to meet thethermal need of flat buildings are studied regarding adaptive thermal comfort criteria. Investigation onthe effects of geometric features shows that the design of SC with the air gap and outlet sizes of 0.2 m andalso EAHE with the diameter and length of 0.5 and 25.0 m reveals better performance. Thermal comfortanalysis shows that the SC is capable to power the underground heating system during few hours of thesunny days even at the ambient temperature as low as 08C and the heating demand of 1000 W withoutneeding the auxiliary devices. In addition, the required numbers of SCs and the underground air channelsare strongly influenced by environmental outdoor conditions and heating demand of building and areapproximately calculated by: room volume/50and 2 ð room volume/50Þþ1, respectively. Keywords: Design; earth-to-air heat exchanger; natural heating; solar chimney Received 31 July 2013; revised 23 November 2013; accepted 4 January 2014
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