1.
Nusselt number (NN) is given by

2.
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

3.
The undesirable property of a refrigerant is

4.
The desirable property of a refrigerant is

5.
The operating pressure for refrigerating units using R-12 as a refrigerant is

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