Air Conditioning Clinic Cooling and Heating Load Estimation by The Trane Company

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

Example text

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, in most buildings, ventilation air is conditioned prior to being delivered to the space. Therefore, the ventilation load adds to the total cooling coil load, but does not add to the space cooling load. Additionally, heat gains that occur within the HVAC system, such as fan heat and duct heat gain, are considered coil loads, but not space loads. VSDFH ORDG FRPSRQHQWV VHQVLEOH ORDG %WXKU >:@ FRQGXFWLRQ WKURXJK URRI FRQGXFWLRQ WKURXJK H[WHULRU ZDOO FRQGXFWLRQ WKURXJK ZLQGRZV VRODU UDGLDWLRQ WKURXJK ZLQGRZV SHRSOH OLJKWV HTXLSPHQW LQILOWUDWLRQ         WRWDO VSDFH FRROLQJ ORDG  >@ >@ >@ >@ >@ >@ >@ >@ >@ ODWHQW ORDG %WXKU >:@  >@  >@  >@  >@ Figure 57 This table lists only the space cooling loads calculated for the example used in Period Two.

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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