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

By Robert S. Curl

This guide is meant to help engineers and technicians with a history 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 process proven and techniques of correction. development of operation almost always leads to aid of application charges. basic screens and directions will permit non-technical group of workers to function apparatus successfully at minimal power expenses. In a number of development installations, this kind of keep watch over could store up to seventy five% of upkeep time since you can examine the situation of the approach with the pc earlier than you ship out the upkeep guy to make changes. additionally, you will be capable of predetermine the precise challenge in order that a similar upkeep guy would not have to spend time checking a few goods until eventually he pinpoints the trouble. the knowledge during this publication will help development proprietors, upkeep group of workers, contractors, and technicians in identifying the operation of energy-using platforms and strategies of lowering strength intake.

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Laboratories: Because of contaminants, exhaust hoods are used. Measure face velocity at hood which should be a minimum of 150 ft/min. Consider limiting opening to still use hood and reducing exhaust. K. Special Equipment a. Thermal Storage: If use of cooling is intermittent, storage of cooling will permit operating smaller equipment for a longer time. If operation can be off peak, utility companies may provide a low rate. Measure compressor operation since suction temperatures are 25° or less. 3 kw per ton.

Page 12 b. Control at air handlers is by thermostat operating valves or dampers similar to direct expansion. Valves may be three-way bypassing water around the coil so as to keep the water flow in the system constant. c. There is a minimum water flow permitted for each chiller to prevent freeze up and equipment damage. 5. Thermostat location. a. Is thermostat located where it measures the average room temperature? b. Is there any heat producing source near thermostat? c. Does sun shine on thermostat?

Single zone b. Multizone c. Reheat d. Medium pressure mixing box e. Variable air volume f. Induction 4. 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.

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