Refrigeration and Air Conditioning
Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure, ps = Pressure of saturated air, pd = Pressure at dry bulb temperature, pw = Saturation pressure corresponding to wet bulb temperature, and μ = Degree of saturation)

μ/[1 - (1 - μ) (Ps/Pb)]
0.622 Pv / (Pb - Pv)
None of these
[Pv (Pb - Pd)]/ [Pd (Pb - Pv)]

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Refrigeration and Air Conditioning
The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

0.1 to 0.5 h.p. per ton of refrigeration
2 to 5 h.p. per ton of refrigeration
1 to 2 h.p. per ton of refrigeration
0.5 to 0.8 h.p. per ton of refrigeration

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