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Define (i) Relative humidity, (ii) Ton of refrigeration, (iii) Point temperature (vi) Degree of Saturation, (v) Coefficient of performance.
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1. Relative Humidity (RH)
It is ratio of partial pressure of water vapor to equilibrium vapor pressure water. Simply it is measure of water vapor in air.
$$\begin {aligned}RH=\frac{P_{H_2 O }} {P^*_{H_2O }} \end{aligned}$$
2. Ton of refrigeration
One ton of refrigeration is equivalent to a refrigeration rate of 12660 …