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REFRIGERATION AND AIR CONDITIONING

Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = μ cp/k
NN = hl/k
NN = ρ V l /μ
NN = V²/t.cp

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

1 - B. P.F.
1 + B.P.F.
P.F. - 1
1/ B.P.F.

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Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

High boiling point
Non-explosive
Non-toxic
Non-flammable

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Refrigeration and Air Conditioning
The desirable property of a refrigerant is

All of these
High critical temperature
High latent heat of vaporisation
Low boiling point

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Refrigeration and Air Conditioning
The operating pressure for refrigerating units using R-12 as a refrigerant is

30 bar
2 bar
15 bar
8 bar

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