explain

Qvent = m X Cp X AT Where: . Qvent : Heat load due to ventilation (W or BT W/ hr) . m: Air mass flow rate (kg/s or lb/hr) . Cp: Specific heat capacity of air (approximately 1.005 kJ/kg.K or 0.24 BTU/lb F) . AT: Temperature difference between indoor and outdoor air ("C or ' F) Alternatively, you can calculate the airflow in terms of volumetric flow rate: Qvent = V X P X Cp X AT Where V is the volumetric flow rate ( m3/s or CFM) and p is the air density ( about 1.2 kg/m3 or 0.075 1b/ ft3 )