“Periodic heat flow-composite walls or roofs”, ASHVE Transaction,s 52, 283, 1946.
Mackey, C.O., Wright, L.T., “Periodic heat flow-homogeneous walls or roofs”, ASHVE Transactions, 50, 293-312, 1944. Ĝhaiyapinunt, S., Mangkornsaksit, K., and Phueakphongsuriya, B., “Development of cooling load temperature differential values for building envelopes in Thailand.”, Journal of the Chinese Institute of Engineers, 27, 677-688, 2004. ĚSHRAE, ASHRAE handbook-fundamentals, ASHRAE, Atlanta, 1993. Wang, S.K., Handbook of air conditioning and refrigeration, McGraw-Hill, New York, 2001. Yumrutas, R., Unsal, M., Kanoglu, M., “Periodic solution of transient heat flow through multilayer walls and flat roofs by complex finite Fourier transform technique”, Building and Environment, 40, 1117–1125, 2005. ěansal, K., Chowdhury, S., Gopal, M.R., “Development of CLTD values for buildings located in Kolkata, India”, Applied Thermal Engineering, 28, 1127–1137, 2008. Yumrutaş, R., Kaşka, Ö., Yıldırım, E., “Estimation of total equivalent temperature difference values for multilayer walls and flat roofs by using periodic solution”, Building and Environment, 42, 1878–1885, 2007. Therefore we are developing Heat load Calculator software based on the RTS method for Indian conditions. Although simple in concept, RTS involves too many calculations for practical use as a manual method, although it can easily be implemented in a simple computerized spreadsheet. The RTS method is suitable for peak design load calculations, but not for annual energy simulations because of its inherent limiting assumptions. These characteristics of the RTS method make it easier to apply engineering judgment during cooling load calculation. In addition, it is desirable for the user to be able to inspect and compare the coefficients for different construction and zone types in a form showing their relative effect on the result. 
This method was developed to offer an approach that is rigorous, yet does not require iterative calculations, and that quantifies each component’s contribution to the total cooling load. It effectively replaces all other simplified (non-heat-balance) methods, such as the transfer function method (TFM), the cooling load temperature difference/cooling load factor (CLTD/CLF) method, and the total equivalent temperature difference/time averaging (TETD/TA) method. The radiant time series (RTS) method is a simplified method for performing design cooling load calculations that are derived from the heat balance (HB) method. Radiant time series method for Indian condition
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