For sensible heating:
The amount of heating input to the air approximates to; H1-2 = m x Cp x (t2 - t1)
Or more accurately from psychrometric chart: H1-2 = m x (h2 - h1)
For sensible cooling:
The amount of cooling input to the air approximates to; H2-1 = m x Cp x (t2 - t1)
Or more accurately from psychrometric chart: H2-1 = m x (h2 - h1)
where: H = Heat or cooling energy (kW)
m = mass flow rate of air (kg/s)
Cp = Specific heat capacity of air, may be taken as 1.01 kJ/kg degC.
t = Dry bulb temperature of air (oC)
h = specific enthalpy of air (kJ/kg) found from psychrometric chart.