Download Analyzing field measurements: air conditioning & heating by Robert S. Curl PDF
By Robert S. Curl
This guide is meant to aid 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 selection will point out the deficiencies of the process proven and strategies of correction. development of operation almost always leads to aid of application expenditures. uncomplicated monitors and directions will allow non-technical body of workers to function apparatus successfully at minimal strength expenses. In a number of construction installations, this kind of keep watch over might retailer up to seventy five% of upkeep time since you can learn the situation of the method with the pc sooner than you ship out the upkeep guy to make alterations. additionally, you will be in a position to predetermine the precise challenge in order that an analogous upkeep guy won't have to spend time checking a few goods till he pinpoints the trouble. the knowledge during this ebook will support development vendors, upkeep group of workers, contractors, and technicians in opting for the operation of energy-using platforms and strategies of lowering power intake.
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Additional info for Analyzing field measurements: air conditioning & heating
Distribution of air to refrigerated display units: Locate the sections of the store which have upright refrigeration cabinets which are open. The air supply system should be directed away from this area. This will result in a fairly cold surrounding area at this location but should not be too uncomfortable to the customers. Determine air flow also across horizontal freezer cabinets, especially with ice cream and similar products, to determine if the air is sweeping these areas and causing additional refrigeration and additional pre-cooling from such areas.
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. Sheet metal - look for dirt streaks at joints.
Dirt streaks at joint corners will show leakage. If the ductwork is poorly assembled, it is possible to lose as much as 60% of the air supply into the space surrounding the ductwork, usually above a ceiling, before it enters the conditioned space outlets. If the ceiling space is a return, this air, of course, returns back to the system. If excessive leakage occurs, this can be partially determined by the temperature of the return air coming back to the air conditioner. If return air is below the average room temperature, short-circuiting is occurring.