=+13-2.

It is necessary to estimate the rate at which water is removed from an airstream by a cooling coil. The mass-transfer coefficient is not known, but the coil was tested at the same Reynolds number under sensible heat-transfer conditions, and the heat-transfer coefficient was 10 Btu/(hr-ft2-F) [56.8 W/(m2-C)]. Estimate the mass-transfer coefficient assuming a mean air temperature of 50 F (10 ℃).