6. 98 TABLE 6.9: SYMBOLS USED IN THE ENVIRONMENTAL CONTROL DESIGN PROCESS LH SH Latent Heat Sensible Heat SHR Sensible Heat Ratio= SH/SH+LH BUTh CFM Ma M water DB WB RH h w V Q Pfan p pump Pthermal British Thermal Units/hour - a measure of energy flow Note: 3.41 BTUh = 1 watt Cubic Feet/Minute: air flow Mass of Dry Air per minute Mass of Water per minute Dry Bulb Temperature Wet Bulb Temperature Relative Humidity enthalpy Humidity ratio lb water content/lb dry air Specific Volume of atmosphere heat flux removed through the cooling coil density of the atmosphere specific heat of atmosphere change in temperature Power needed to operate air fans Power needed to operate pumps Power needed to operate environmental control process watts watts BTUh cfm lb/min lb/min op op BTU/lb FT 3 /lb BTU/min lb/FT 3 BTU/lb°F op watts watts watts
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