Latent Heat
Latent heat, abbreviated as \(Q_l\), 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 |
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\(\large{ Q_l = \frac{Q}{m} }\) \(\large{ Q_l = 0.68 \; cfm \; \Delta gr }\) (HVAC) btu/hr |
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Symbol | English | Metric |
\(\large{ Q_l }\) = latent heat of a substance | \(\large{\frac{Btu}{lbm}}\) | \(\large{\frac{kJ}{kg}}\) |
\(\large{ cfm }\) = cubic feet per minute | \(\large{\frac{ft^3}{min}}\) | \(\large{\frac{m^3}{min}}\) |
\(\large{ \Delta gr }\) = grains/lb differential | \(\large{\frac{gr}{lbm}}\) | \(\large{\frac{mg}{kg}}\) |
\(\large{ m }\) = mass of the substance | \(\large{lbm}\) | \(\large{kg}\) |
\(\large{ Q }\) = amount of energy transferred for the phase change | \(\large{lbf-ft}\) | \(\large{J}\) |
Tags: Heat Equations HVAC Equations