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By Wang S.K.

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0°F. 0) = 52, 451 Btu hr o Warm Air Supply without Space Humidity Control When the sum of space heat losses is greater than the sum of the internal heat gains in winter, a warm air supply is needed. For many comfort systems such as those in offices and stores, in locations where winter is not very cold, humidification is usually not necessary. 5(a). 5 Basic air-conditioning cycle — winter modes: (a) warm air supply without space humidity control, (b) cold air supply without space humidity control, and (c) cold air supply with space humidity control.

1999 by CRC Press LLC 9-53 Air-Conditioning and Refrigeration Human ears can hear frequencies from 20 Hz to 20 kHz. For convenience in analysis, sound frequencies are often subdivided into eight octave bands. An octave is a frequency band in which the frequency of the upper limit of the octave is double the frequency of the lower limit. An octave band is represented by its center frequency, such as 63, 125, 250, 500, 1000, 2000, 4000, and 8000 Hz. On 1000 Hz the octave band has a higher limit of 1400 Hz and a lower limit of 710 Hz.

If its final state is equal to its initial state, it is a closed cycle; if the final state does not equal the initial state, it is an open cycle. Vapor compression refrigeration cycles can be classified as single stage, multistage, compound, and cascade cycles. 1. In a p-h diagram, pressure p, in psia or psig logarithmic scale, is the ordinate, and enthalpy h, in Btu/lb, is the abscissa. The saturated liquid and saturated vapor line encloses a two-phase region in which vapor and liquid coexist.

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