**Latent Heat**

To calculate the latent heat due to moisture in the air we can use this equation

**hl = 4,840 q dwlb**

**hl** is the latent heat in Btu per hour

**q** is the air volume flow in cubic feet per minute

**dwlb** is the humidity ratio difference in lb water per lb dry air

**Sensible Heat**

To calculate the sensible heat in a heating or cooling process of air we can use this *equation*

*hs = 1.08 q ΔT*

**hs** is the sensible heat in Btu per hour

**q** is the air volume flow in cubic feet per minute

**ΔT** is the temperature difference in °F

**Total Heat – Latent and Sensible Heat**

To calculate the Total heat(Sensible and Latent Heat) due to both temperature and

moisture we can use this equation

**ht = 4.5 q Δh**

**ht** is the total heat in Btu per hour

**q** is the air volume flow in cubic feet per minute

**Δh** is the enthalpy difference in btu per lb dry air

Or we can calculate the Total Heat by using this equation

**ht = hs + hl= 1.08 q dt + 0.68 q dwgr**