Refrigeration and Air Conditioning
The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process)

(hA - h2)/ (h1 - h2)
(hA - h1)/ (h2 - h1)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)

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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

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

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Refrigeration and Air Conditioning
The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)

(td₃ - td₂)/(td₃ - td₁)
(td₂ - td₃)/(td₃ - td₁)
(td₃ - td₁)/(td₂ - td₃)
(td₃ - td₁)/(td₃ - td₂)

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Refrigeration and Air Conditioning
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

Which is lower than the dew point temperature of the incoming stream
Of adiabatic saturation of incoming stream
Which lies between the wet bulb and dew point temperatures of the incoming stream
Which lies between the dry bulb and wet bulb temperatures of the incoming stream

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Refrigeration and Air Conditioning
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because

It considerably reduces mass of the system
It improves the C.O.P., as the condenser is small
It leads to significant cost reduction
The positive work in isentropic expansion of liquid is very small

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