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Sample text

8ºC] that we assumed, we need to recalculate the supply airflow. 89 SHR line. This second iteration will likely result in the same supply air condition as the first iteration. 1°C wet bulb] to offset the sensible and latent heat gains for the space in the correct proportions. For more information on the process of analyzing an HVAC system on the psychrometric chart, refer to the Psychrometry Air Conditioning Clinic. TRG-TRC002-EN 59 period three Psychrometric Analysis notes 5RRP  %WXKU >:@ WRWDO VSDFH VHQVLEOH ORDG  >@ WRWDO VSDFH ODWHQW ORDG YHQWLODWLRQ  >@  >@ WRWDO FRLO FRROLQJ ORDG  >@ Figure 66 Finally, the cooling coil in the air-conditioning system that serves this space must be capable of handling the sensible and latent loads for the space, plus any additional loads that affect the coil only.

For example, if the supply ductwork is routed through an unconditioned space, such as a ceiling plenum or an attic, heat can be transferred from the air surrounding the duct to the supply air. 48 TRG-TRC002-EN period two Cooling Load Estimation notes Supply ductwork is generally insulated to prevent this heat gain and the associated increase in temperature of the supply air. An increased supply air temperature requires a greater amount of supply air to maintain the desired space conditions, resulting in more fan energy use.

Additionally, when estimating the heat gain from fluorescent lights, approximately 20% is added to the lighting heat gain to account for the additional heat generated by the ballast. 0 for incandescent lights n CLF = cooling load factor, dimensionless Similar to the sensible heat gain from people, a cooling load factor (CLF) can be used to account for the capacity of the space to absorb and store the heat generated by the lights. 0. TRG-TRC002-EN 35 period two Cooling Load Estimation notes OLJKWV ™ OLJKWV ™ ™ ™ ™ Figure 40 Next, determine the internal heat gain from lighting in our example space.

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