# Heat Transfer Rate

Heat transfer rate, abbreviated as \(Q_t\), is the amount of hear transfered per unit of time per fluid or material.

## Heat Transfer Rate FormulA |
||

\(\large{ Q_t = k_t \; \frac { \Delta T}{l} }\) | ||

Symbol |
English |
Metric |

\(\large{ Q_t }\) = heat transfer rate | \(\large{\frac{Btu}{hr}}\) | \(\large{W}\) |

\(\large{ l }\) = length or distance | \(\large{ft}\) | \(\large{m}\) |

\(\large{ \Delta T }\) = temperature differential | \(\large{F}\) | \(\large{K}\) |

\(\large{ k_t }\) = thermal conductivity constant | \(\large{\frac{Btu-ft}{hr-ft^2-F}}\) | \(\large{\frac{W}{m-K}}\) |