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The shape of NC curves is similar to the equal-loudness contour representing the response of the human ear. NC curves also intend to indicate the permissible sound pressure level of broad-band noise at various octave bands rated by a single NC curve. NC curves are practical and widely used. Other criteria used are room criteria RC curves and A-weighted sound level, dBA. RC curves are similar to NC curves except that the shape of the RC curves is a close approximation to a balanced, bland-sounding spectrum.

Chilled water and brine are cooling media. They are often called secondary refrigerants to distinguish them from the primary refrigerants. A liquid absorbent is a working fluid used to absorb the vaporized refrigerant (water) after evaporation in an absorption refrigeration system. The solution that contains the absorbed vapor is then heated. The refrigerant vaporizes, and the solution is restored to its original concentration to absorb water vapor again. A numbering system for refrigerants was developed for hydrocarbons and halocarbons.

F/Btu), affects the sensible heat loss. 2 clo in winter. 6 69–74 75–78 <30 <50 If a suit jacket is the clothing during summer for occupants, the summer indoor design temperature should be dropped to 74 to 75°F. Regarding the indoor humidity: 1. Many comfort air-conditioning systems are not equipped with humidifiers. Winter indoor relative humidity should not be specified in such circumstances. 2. 1-1989 requires that the humidity control prevent “the use of fossil fuel or electricity to produce humidity in excess of 30% ...

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Air-conditioning and refrigeration by Wang S.K.

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