Latent Heat

Written by Jerry Ratzlaff on . Posted in Thermodynamics

matter phasesLatent heat, abbreviated as L, is the energy absorbed or released by a substance during a constant temperature or phase change from a solid to liquid, liquid to gas or vise versa.

 

Latent Heat Formulas

\(\large{ L = \frac{Q}{m}  }\)   
\(\large{ L = 0.68 \; cfm \; \Delta gr  }\) (HVAC) btu/hr

Where:

\(\large{ L }\)  = latent heat of a substance

\(\large{ cfm }\)  = cubic feet per minute

\(\large{ \Delta gr }\)  = grains/lb differential

\(\large{ m }\) = mass of the substance

\(\large{ Q }\) = amount of energy transferred for the phase change

Solve for:

\(\large{ Q = m \; L }\)   

Tags: Equations for Heat Equations for HVAC Equations for Soil