Cooling Forumulas

Gross btu/hr = net btu/hr + (blower motor watts x 3.413) *only if the blower motor is in the air stream

EER = net btu/hr / total watts

Latent Cooling Capacity = 1061 x lbs.\hr

Super Heat and Subcooling

Generally excepted values – 10-15 degrees each

Superheat = suction line temperature – suction pressure converted to saturation temp.

Subcooling = liquid pressure converted to saturation temp. – Liquid line temp.

Basic cooling capacity formula

ΔH = btu/lb entering - btu/lb leaving

net capacity (btu/hr) = (unit cfm / ft3/lb of leaving air)x 60 x ΔH

gross capacity = net capacity + blower motor btu's

The Calculating tool uses both quantitative data and qualitative information covering HVAC design, installation and operation to benchmark energy efficient performance and identify potential areas for improvement.

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User warning: all this results are based on quick estimate calculation. Exact heat /cool load can be determined with a full heat and cool load analysis

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