6. Cooling and Heating Load Calculations

This chapter provides detailed coverage of both cooling and heating load calculations. After a brief introduction in Sect. 6.1, the cooling and heating load calculation procedures are compared in Sect. 6.2. Section 6.3 provides extensive coverage of cooling load calculations by examining all possible sources of heat gain including heat gain due to occupants, lights, and appliances. This section has several sub-sections illustrating calculations of sensible and latent cooling loads with detailed step-by-step calculations of different types of loads due to heat conduction, radiation, infiltration, and ventilation. The design outdoor and indoor conditions are also discussed in Sect. 6.3. Section 6.3 illustrates the use of data from ASHRAE tables including cooling load temperature difference (CLTD), cooling load factor (CLF), solar heat gain coefficient (SHGC), solar cooling load (SCL), shading coefficient (SC), and solar heat gain factor (SHGF). The differences between cooling load for the space and the cooling load on the cooling coil (cooling device) are illustrated in Sect. 6.3. Section 6.4 focusses on calculation of heating loads. This section provides detailed step-by-step procedures for calculating heating loads due to heat loss through surface, and heat losses due to infiltration, and ventilation.