The heat transfer coefficient was formerly called the total heat transfer coefficient. The heat transfer coefficient is unified in the current national standard.
The value of heat transfer coefficient K refers to the heat transferred through 1 square meter area within 1 s when the air temperature difference on both sides of the enclosure structure is 1 degree (k, ℃), and the unit is w/(M2·K), where k can be replaced by ℃.
1 kcal/m2·H (kcal/m2·h) = 1.16279 w/m2 (w/m2).
1kcal/(M2·h·℃) = 1.16279w/(M2·Kelvin) [w/(M2·K)]
1 BTU/(ft2·h·°f)] = 5.67826 w/(M2·Kelvin) [(w/m2·K)]
1 m2·h·℃/kcal = 0.86000 M2·Kelvin/w(M2·K/W)
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