Air Conditioning Charging Procedures Review. Basic Refrigeration. Basic Refrigeration. Liquid Line. Liquid Line. Metering Device. Condenser. Low Side. Hi Side. Evaporator. Compressor. Saturation Temperature. What is Saturation Temperature?.
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You must verify that you have proper airflow!…and you must have the proper tools to do the job….
-Evaporator Pressure Drop
-Air – Velocity
(Red Book, Pg. 33)
T X 1.08*
*1.08 = constant number for std air. It’s a combination of a number of values that are in the complete equation. Std air is 70F, sea level
55,200 BTU output
60 X 1.08
Digital Thermometer (one with Wet Bulb capabilities)
+ “Check the Enthalpy of the Evaporator Coil to verify system capacity…”
Total Heat Removed =
CFM X 4.5 X Change inEnthalpy (Heat Content)
Where’s the 4.5 come from?
It’s how many BTU’s are in one pound of DRY air (0%Rh)
Total Heat =CFM X 4.5 X Enthalpy Change
Difference = 6.79
800 X 4.5 X 6.79
= 24,444 BTUH !