Solar tracking should be accounted for in all spaces, including interior spaces which may receive solar radiation in the morning or late afternoon when the sun angle is lower.On some occasions, a ground-contact floor with high thermal mass may even remove heat from a space during a cooling load calculation. Accurate model geometry is necessary and should account for all surfaces of a space or room including the internal walls, ceilings and floors.There are three “Heat Balances” shown in Figure 1 of the Heat Balance (HB) Method and two of those “Heat Balances” are applied to eachsurface of a space or room.įrom a design-engineering perspective, there are two important implications: The industry-standard ASHRAE Heat Balance Method has a number of important concepts, three of which are highlighted below. The ASHRAE Heat Balance Method was first defined as the preferred method for Load Calculations in the 2001 ASHRAE Handbook-Fundamentals, and it is now the most widely adopted non-residential load calculation method by practicing design engineers.
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