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Under normal operating conditions a zone has a total cooling load of 120,000 Btu/hr (35 kW) with a SHF of 0.8. The space is to be maintained at 74 F (23 C) db and 50% relative humidity (RH). However, there are periods when the latent load is high and the SHF is estimated to be as low as 0.6. Assume that air enters the cooling coil at 8 F (29 C) db and 71 F (22 C) wb and the coil apparatus dew point is 48 F (9 C). (a) Devise a system and the associated psychrometric processes to cover the necessary range of operation. b) Define the various air states and show the processes on Chart ia. (c) Compute air-flow rate, coil load, minimum zone load, and any reheat that may be required. Assume constant air flow and standard sea-level pressure.
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Heating Ventilating and Air Conditioning: Analysis and Design
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