The total cooling equation for an HVAC system, Qt = 4.5 x CFM x dH, determines the system's cooling load in BTU/hr. It incorporates the airflow rate (CFM), the enthalpy difference (dH in BTU per pound of dry air), and a factor (4.5) derived from the air density under "standard air" conditions (0.075 lb/ft³ at sea level and 70°F). Note that deviations from these standard conditions can affect the factor used in the calculation. #hvac #hvactechnician #hvacfamily #hvactech #hvacservice | Tony Mormi
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