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Extra info for Air Conditioning Clinic Cooling and Heating Load Estimation One of the Fundamental Series TRG-TRC002-EN

Example text

The data on this slide is an excerpt from the 1997 ASHRAE Handbook— Fundamentals. The handbook contains tables of sensible and latent heat gains from various types of office and restaurant equipment, although data for the actual piece of equipment is preferred, if available. Using this table, we estimate that the coffee maker contributes 3,580 Btu/hr [1,050 W] of sensible heat and 1,540 Btu/hr [450 W] of latent heat to our example space. 7 m2]). 7 m2 = 1,354 W] Similar to the sensible heat gain from people and lighting, tables of cooling load factors (CLF) can be used to refine this estimate.

For heat gain from people, the value of CLF depends on 1) the construction of the interior partition walls in the space, 2) the type of floor covering, 3) the total number of hours that the space is occupied, and 4) the number of hours since the people entered the space. Figure 37, CLF Factors for People, is an excerpt from the 1997 ASHRAE Handbook—Fundamentals. 65) of the sensible heat gain from the people is absorbed by the surfaces and furnishings in the space, and 65% is the actual cooling load in the space.

Heat gain from a fan is associated with three energy conversion losses. Fan motor heat is due to the energy lost in the conversion of electrical energy (energy input to the motor) to mechanical energy (rotation of the motor shaft). It is dissipated as heat from the motor and is represented by the inefficiency of the motor. fan motor heat gain = power input to motor × (1 – motor efficiency) If the fan motor is also located within the conditioned airstream, such as inside the cabinet of an air handler (as shown in Figure 51), it is considered an instantaneous heat gain to the airstream.

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