The saturated absolute humidity at the interface temperature
was plotted as a function of the refrigerant temperature (8 and
20 C) and the air-side heat transfer coefficient (60 and 80 W/
m2 C), as shown in Fig. 2, to allow for detailed analysis of the
increase in the mass transfer rate with respect to the air-side heat
transfer coefficient (air velocity). Here, the interface temperature is
the equivalent temperature of the fin and tube surfaces, and was
calculated from the mathematical model of Ye et al. [28]. The difference
in absolute humidity between the air and saturated air at
the interface temperature is the driving force for the mass transfer,
and the product of the mass transfer coefficient and the driving
force determines the mass flux. The interface temperature was
9.5 C for a refrigerant temperature of 20 C and an air-side heat
transfer coefficient of 60 W/m2 C. When the air-side heat transfer
coefficient increased to 80 W/m2 C at a refrigerant temperature of
20 C (i.e., the air velocity increased), the interface temperature
reached 7.3 C because the thermal resistance between the interface
and air decreased. The increase in the interface temperature
caused the saturated absolute humidity to rise, and as a result,
the difference in absolute humidity between the air and interface
The saturated absolute humidity at the interface temperature
was plotted as a function of the refrigerant temperature (8 and
20 C) and the air-side heat transfer coefficient (60 and 80 W/
m2 C), as shown in Fig. 2, to allow for detailed analysis of the
increase in the mass transfer rate with respect to the air-side heat
transfer coefficient (air velocity). Here, the interface temperature is
the equivalent temperature of the fin and tube surfaces, and was
calculated from the mathematical model of Ye et al. [28]. The difference
in absolute humidity between the air and saturated air at
the interface temperature is the driving force for the mass transfer,
and the product of the mass transfer coefficient and the driving
force determines the mass flux. The interface temperature was
9.5 C for a refrigerant temperature of 20 C and an air-side heat
transfer coefficient of 60 W/m2 C. When the air-side heat transfer
coefficient increased to 80 W/m2 C at a refrigerant temperature of
20 C (i.e., the air velocity increased), the interface temperature
reached 7.3 C because the thermal resistance between the interface
and air decreased. The increase in the interface temperature
caused the saturated absolute humidity to rise, and as a result,
the difference in absolute humidity between the air and interface
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