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22 Standard Operating Conditions Every piece of HVAC equipment available is based on some particular operating conditions such as maximum temperature or pressure; usually, these conditions are spelled out by the manufacturer It is the responsibility of the design engineer to check these conditions and to ensure that they are compatible with the system conditions It is very important that variations in electrical service as well as maximum ambient air temperature be verified for all operating equipment
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Standard air conditions must be defined for ambient and ventilation air Ambient air is the surrounding air in which all HVAC equipment must operate Standard ambient air is usually listed as 70 F, while maximum ambient air temperature is normally listed at 104 F This temperature is the industry standard for electrical and electronic equipment For some boiler room work, the ambient air may be listed as high as 140 F It is incumbent on the designer to ensure that his or her equipment is compatible with such ambient air conditions Along with ambient air temperature, the designer must be concerned with the quality of ventilation air This is the air that is used to cool the operating equipment as well as provide ventilation for the building The designer must ensure that the equipment rooms are not affected by surrounding processes that contain harmful substances This includes chemicals in the form of gases or particulate matter Hydrogen sulfide is particularly dangerous to copper-bearing equipment such as electronics Many sewage treatment operations generate this gas, so it is very important that any HVAC equipment installed in sewage treatment facilities be protected from ambient air that can include this chemical Dusty industrial processes must be separate from equipment rooms to keep equipment clean Dust that coats heating or cooling coil surfaces or electronics will have a substantial effect on the performance and useful life of that equipment The designer must be aware of the presence of any such substances that will harm the HVAC equipment Ventilation air does not bother the operation of the pump itself, but it does affect the pump motor or variable-speed drive This is the air that is used to cool this electrical equipment Evaluating ventilation air is part of the design process for the selection of such equipment and is therefore very important in equipment selection Outdoor air data including maximum wet bulb and dry bulb temperatures is listed in the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE s) Systems and Equipment Handbook for most of
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2006 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Physical Data for HVAC System Design Physical Data for HVAC System Design 15
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the principal cities Indoor air quality must be verified as well, both from a chemical content basis as well as from a temperature basis Heat generation in the equipment rooms must be removed by ventilation or mechanical cooling to ensure that the design standards of the equipment are not exceeded
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222 Operating pressures
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Gauge pressure is the water or steam pressure that is measured by a gauge on a piece of HVAC equipment Following is the basic equation for gauge, absolute, and atmospheric pressures psia where psia psig Pe psig P e (21)
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absolute pressure, lb/in2 (psi) gauge pressure, lb/in2 (psi) atmospheric pressure, lb/in2 (psi)
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For example, if a water system is operating at 75 psig pressure at an altitude of 1000 ft, from Table 21, the atmospheric pressure is 142 lb/in2, so the absolute pressure is 892 psia
TABLE 21
Variation of Atmospheric Pressure with Altitude Average pressure Pa, ft H2O, up to 85 F 340 333 328 321 316 310 305 293 282 273 261 252 243 233 192 155
Altitude, ft 0 500 1,000 1,500 2,000 2,500 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000 15,000 20,000
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