The first is the transfer function method (TFM) (implemented in the well-known DOE-2 and eQuest simulation programs) that involves three distinct sequential phases: calculation of individual heat gains of three types (conduction, solar, and internal), determination of cooling loads that depend on room and other properties, and the heat extraction rate (applicable when the zone thermostat set point is not kept constant). We present three different methods to determine design cooling load. We discuss various issues pertinent to cooling load calculations that require transient heat calculations and involve many more interactive terms to be considered. The peak heating load is relatively simple to determine requiring only a few heat transfer phenomena and a steady-state approach. The procedure begins with a detailed description of the design climatic conditions. The focus of this chapter is to cover methods that combine all these heat flows and interactions in order to determine design loads on the peak day(s) of the year annual loads and energy consumption are addressed in the next chapter. The calculation of various driving forces affecting cooling and heating loads of a zone or building along with steady-state and transient heat flow models has been treated in previous chapters.
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