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ISBN-10: 1883413826

ISBN-13: 9781883413828

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The primary air quantity to units serving the north, northeast, or northwest exposures can usually be reduced by using separate primary air zones with different A/ T ratios and reheat schedules. Primary air quantity should never be reduced below minimum ventilation requirements. The peak cooling load for the south exposure occurs during the fall or winter months when outside temperatures are lower. If present or future shading patterns from adjacent buildings or obstructions will not be present, primary air zoning by solar exposure can reduce air quantities and unit coil sizes on the south.

1, Large Building AirConditioning Systems. 2 2000 ASHRAE Systems and Equipment Handbook (SI) the building and (2) to keep discharge air from fogging the building’s windows. Towers should be kept the same distance from parking lots to avoid staining car finishes with water treatment chemicals. When the tower is on the roof, its vibration and noise must be isolated from the building. Some towers are less noisy than others, and some have attenuation housings to reduce noise levels. These options should be explored before selecting a tower.

ASHRAE Journal 9(8):37. CHAPTER 4 CENTRAL COOLING AND HEATING Refrigeration Equipment ................................................................................................................ Heating Equipment ......................................................................................................................... Distribution ..................................................................................................................................... Instrumentation ...............................................................................................................................

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ASHRAE 2000 HVAC Systems and Equipment Handbook


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