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

By Robert S. Curl

This handbook is meant to help engineers and technicians with a historical past of use of temperature, strain, humidity, ventilation, and flue fuel tools, to interpret their readings of box measurements. This decision will point out the deficiencies of the method confirmed and strategies of correction. development of operation almost always ends up in aid of application charges. basic monitors and directions will let non-technical team of workers to function gear successfully at minimal power bills. In a number of development installations, this sort of keep an eye on could keep up to seventy five% of upkeep time since you can research the of the process with the pc prior to 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 do not have to spend time checking a couple of goods till he pinpoints the trouble. the knowledge during this ebook will support development vendors, upkeep team of workers, contractors, and technicians in picking the operation of energy-using structures and strategies of lowering strength intake.

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11. Check fan belts. 12. When running, measure amps and volts on fan motor. Check with nameplate rating. Low amps may indicate low fan capacity. Low air flow requires lower supply air temperature to produce enough cooling, consequently more kw to run systems. 13. Inspect filters for cleanliness. 14. Inspect unit housing for air leaks. 15. Measure air static pressure entering and leaving unit. a. G. G. High static pressures indicate Page 6 restrictions in ducts. This is usually caused by dampers or turning vanes.

Or at various levels? Measure air temperature on walkways on every floor. Cooling may be satisfactory, heating may not. Reduce cooling and lighting during janitorial cleaning. Put on time cycle. ft. 3. Restaurants a. Kitchens. (1) Refrigeration: Inspect condensers for dirt and direction of heated air. Air should be directed away from personnel Measure outside surface temperature of refrigerator or walk in walls. Cold surface means bad insulation. (2) Refrigerated display cabinets: Shut off all cooling supply to this area.

Measure air temperature in return air duct. 5. Measure air temperature in outside air duct. 6. Measure temperature of mixed air entering unit. 7. Calculate percentage of outside air from temperatures 4, 5, 6. A. A. A. A. temperature X 100 8. Determine if this much outside air is necessary (20 CFM per person). 9. Examine the cooling coil: a. Are fins clean? b. If end of coil is exposed, feel return bends, top to bottom, for same level of cold. c. How many rows of tubes. Four (4) rows should be minimum, six (6) preferred.

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