Download PDF by Wang S.K.: Air-conditioning and refrigeration

By Wang S.K.

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Space heat extraction rate qex, in Btu/hr, is the rate at which heat is removed from the conditioned space. When the space air temperature is constant, qex = qrc. 4. Space heating load qrh, in Btu/hr, is the rate at which heat must be added to the conditioned space to maintain a constant temperature. 5. Coil load qc, in Btu/hr, is the rate of heat transfer at the coil. The cooling coil load qcc is the rate of heat removal from the conditioned air by the chilled water or refrigerant inside the coil.

For laboratories, restrooms, or workshops where toxic, hazardous, or objectional gases or contaminants are produced, a slightly lower pressure than the surroundings, a negative pressure, should be maintained to prevent or reduce the diffusion of these contaminants’ exfiltrate to the surrounding area. 05 in in. WG. WG indicates the pressure at the bottom of a top-opened water column of specific inches of height; 1 in. 03612 psig. For clean rooms, Federal Standard No. 05 in. WG with all entryways closed.

In energy use calculations, hour-by-hour outdoor climate data of a design day should be adopted instead of summer and winter design values. S. S. S. Navy, and Canadian Atmospheric Environment Service. 5, or 5% of the total number of hours in these summer months (2928 hr). The data are an average of 15 years. 025 × 2928 = 73 hr, is most widely used. s during the summer months. s ′ less than 73 hr. This design value is often used for evaporative cooling design. • Mean daily range, in °F, is the difference between the average daily maximum and the average daily minimum temperature during the warmest month.

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Air-conditioning and refrigeration by Wang S.K.


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