Wednesday, August 5, 2009

Abbreviations in Air Conditioning Works

Abbreviations

There are some adding abbreviations that normally used in air conditioning work in addition to the standard that have been use in international standards (S.I):

ahu : Air-Handling Unit
swg : Static water gauge
ach : Air changes (room volumes) per hour
db : dry bulb temperature
wb : wet bulb temperature
dp : dew point temperature
rh : relative humidity
kg/kg : kilogram water vapour per kilogram dry air (absolute moisture content)
TH : Total Heat
SH : Sensible Heat
LH : Latent Heat
SHR : Sensible Heat Ratio
ON OFF: The condition of air or water entering or leaving a coil or heat exchanger
TR: Tons of refrigeration capacity
TRE: Tons of refrigeration capacity extracted
TRR: Tons of refrigeration rejected (at final cooler)
HP: High Pressure (refrigerant)
LH: Low Pressure (refrigerant)
DX: Direct expansion cooling




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