Air Conditioning System Design Manual, Second Edition by ASHRAE Press

By ASHRAE Press

The air-con handbook was once written to help entry-level engineers within the layout of air-conditioning platforms. it's also suable - in conjuction with basic HVAC&R resourcee fabric - as a senior- or graduate-level textual content for a school path in HVAC procedure layout. The handbook used to be written to fill the void among conception and perform - to bridge the space among real-world layout practices and the theoretical caluclations and analytical tactics or at the layout of parts.

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Sample text

The indoor air quality procedure offers an analytical alternative, allowing the designer to determine the ventilation rate based upon knowledge of the contaminants being generated within the space and the capability of the ventilation air supply to limit them to acceptable levels. While Standard 62 contains guidelines concerning maximum concentrations of some pollutants, “threshold limit values” for AIR-CONDITIONING SYSTEM DESIGN MANUAL⏐57 industrial applications and other pollutants are published by the American Conference of Governmental Industrial Hygienists (ACGIH 1992).

A pressure-reducing device, damper, or pressure regulator located in a terminal unit may generate noise as the energy expended in pressure reduction is converted to sound. This is why oversizing of terminal air devices is undesirable. Large-volume terminals (>2000 cfm AIR-CONDITIONING SYSTEM DESIGN MANUAL⏐33 [950 L/s]) and those with higher pressure differentials produce greater noise levels. Pressure-reducing devices should be installed in the duct system with sufficient downstream ductwork to absorb the sound generated by the device.

On the other hand, interior and perimeter spaces should almost always be on separate systems or control zones because of the disparity of their thermal loads. Rapid cycling of space temperature—as can occur with ON/OFF control—is yet another system and control consideration that can affect occupant comfort. Decisions regarding zoning requirements and the related cost implications must be resolved through the collaboration of the design team, the owners, and, if feasible, the prospective tenants.

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