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Analyzing field measurements: air conditioning & heating by Robert S. Curl PDF

By Robert S. Curl

This guide is meant to help engineers and technicians with a heritage of use of temperature, strain, humidity, ventilation, and flue fuel tools, to interpret their readings of box measurements. This choice will point out the deficiencies of the approach demonstrated and strategies of correction. development of operation almost always ends up in relief of application expenses. basic monitors and directions will allow non-technical body of workers to function gear successfully at minimal strength bills. In a number of construction installations, this kind of keep an eye on might retailer up to seventy five% of upkeep time since you can learn the situation of the method with the pc earlier than you ship out the upkeep guy to make changes. additionally, you can be in a position to predetermine the precise challenge in order that an analogous upkeep guy wouldn't have to spend time checking a few goods till he pinpoints the trouble. the data during this ebook will help development vendors, upkeep body of workers, contractors, and technicians in choosing the operation of energy-using structures and techniques of reducing strength intake.

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If system is blow through, look for air bypassing coils or filters. 3. Air Quantity a. If air quantity supplied from air outlets is below total air supply 1. Look for duct leaks. a. Trunk ducts. b. At take off branch connections. c. At connections from duct to air outlets. [EXPERIENCE] In testing 100 houses, the connection between the duct and drywall ceiling air outlet leaked in 56. SMACCNA calls for a sheet metal collar between trunk and air outlet. b. Check fan operation if air quantity is low.

For gymnasiums which are not air conditioned, economizer control is essential since outside air cooling is required during periods of peak occupancy especially during public sporting exhibitions. Locker rooms, which require considerable ventilation, can be placed on recirculation or intermittent operation during non-occupied periods. Toilet room exhaust should be inter- Page 22 locked with the supply system to shut off fans during non-occupied periods. e. Living and Sleeping: Sleeping rooms should by individually controlled but, if not practical, should be at least zoned in accordance with solar exposure or direction.

Reset dampers. 3. Sharp duct turns close to supply fan outlet cause interference. 4. Dirty reheat coils. 5. Complicated duct elbows. (Check static pressure entering and leaving assembly. ) [EXPERIENCE] Two 90° elbows together 20 ft from fan on 4 inch static system has 3 inch pressure drop. Changed to three 45° elbows, static now ½ inch. 6. In double duct system, balance static pressure in both ducts under heating and cooling conditions. 7. Low air supply static pressure. a. If return air temperature is low, look for duct leaks.

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