Sensible Heat Load

Calculates the heat load when water changes temperature without changing phase. Used for heat exchangers, chilled water loops, and closed loops.

$$Q=m\times c_p\times \Delta T$$

Variables

Symbol	Meaning	Unit
Q	Heat load	BTU/hr
m	Mass flow	lb/hr
$c_p$	Specific heat (1.0 for water)	BTU/lb·°F
$\Delta T$	Temperature change	°F

Worked example

Heating one pound of water from 72°F to 212°F: Q = 1 lb x 1.0 BTU/lb·°F x 140°F = 140 BTU.

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Part of The Blueprint of Water