By Robert S. Curl
This guide is meant to aid 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 selection will point out the deficiencies of the procedure validated and strategies of correction. development of operation almost always ends up in relief of application bills. basic monitors and directions will allow non-technical group of workers to function apparatus successfully at minimal strength bills. In a number of development installations, this sort of keep an eye on may well retailer up to seventy five% of upkeep time since you can study the situation of the process with the pc ahead of you ship out the upkeep guy to make changes. additionally, you'll be in a position to predetermine the precise challenge in order that an identical upkeep guy don't have to spend time checking a few goods until eventually he pinpoints the trouble. the data during this e-book will help construction proprietors, upkeep team of workers, contractors, and technicians in making a choice on the operation of energy-using platforms and strategies of lowering strength intake.
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Feel lower tubes of coil. They may be warmer. E. Chilled Water Systems 1. Measure water pressure at highest point of system. This should be at least 10 psi to make sure all equipment has water flowing Page 7 through it. If under 10 psi, locate makeup water valve, expansion tank, relief valve, and adjust. If relief valve opens at 12psi, replace with 30 psi valve. 2. Measure chilled water temperature entering and leaving chiller. Leaving temperature should be 42° to 45° for dehumidification. Temperature rise outlet to inlet should be from 8° to 12°.
If temperature drops below 54° there may be restricted air flow. 5b. Set thermostat 5° above room temperature. Measure air temperature. It should not go up to much over 80°. Above 80° indicates reheat or high outside air volume. 6a. Locate return grille. If room has lay-in ceiling and space above is used for return, measure air temperature above ceiling in area closest to air handler. Return below room air temperature indicates duct leaks. 6b. Fiberglass duct leaks - look for loose tape at joints and at tap in connections to main trunks.
To 15 ft. high. If these service areas are cooled from the air conditioning system or have separate lower temperature refrigeration systems for air circulation, we suggest that the air supply be lowered to a maximum of 10 ft. and the proper air outlets used so that the upper part of the space does not have to be air conditioned. A layer of warm air near the ceiling can remain which would reduce the cooling requirements for these areas. Check also to determine if there can be some time cycle control on these areas so that they are not cooled during unoccupied periods.
Analyzing field measurements: air conditioning & heating by Robert S. Curl