Sensible heat factor is given by (where SHR = Sensible Heat Ratio and LHR = Latent Heat Ratio)
A. $$\frac{{{\text{SHR}}}}{{{\text{SHR}} + {\text{LHR}}}}$$
B. $$\frac{{{\text{SHR}} + {\text{LHR}}}}{{{\text{SHR}}}}$$
C. $$\frac{{{\text{LHR}} - {\text{SHR}}}}{{{\text{SHR}}}}$$
D. $$\frac{{{\text{SHR}}}}{{{\text{LHR}} - {\text{SHR}}}}$$
Answer: Option A
Solution (By Examveda Team)
Sensible Heat Ratio (SHR) - is used to describe the ratio of sensible heat load to total heat load and can be expressed as:$$\eqalign{ & {\text{SHR}} = \frac{{{{\text{q}}_{\text{s}}}}}{{{{\text{q}}_{\text{t}}}}} \cr & = \frac{{{{\text{q}}_{\text{s}}}}}{{{{\text{q}}_{\text{s}}} + {{\text{q}}_l}}}......\left( {\text{1}} \right) \cr} $$
where,
SHR = sensible heat ratio (ratio of sensible heat load to total heat load)
$${{{\text{q}}_{\text{s}}}}$$ = sensible heat load (kW, Btu/hr)
$${{{\text{q}}_{\text{t}}}}$$ = total heat load - sensible heat and latent heat (kW, Btu/hr)
$${{{\text{q}}_l}}$$ = latent heat load (kW, Btu/hr)
For an air flow (1) can be modified to:
$${\text{SHR}} = \frac{{{{\text{c}}_{\text{p}}}\left( {{{\text{t}}_{\text{o}}} - {{\text{t}}_{\text{i}}}} \right)}}{{{{\text{h}}_{\text{o}}} - {{\text{h}}_{\text{i}}}}}......\left( {\text{2}} \right)$$
where,
$${{{\text{c}}_{\text{p}}}}$$ = specific heat air (1.005 kJ/kg°C, 0.240 Btu/lb°F)
$${{{\text{t}}_{\text{o}}}}$$ = outlet air temperature (°C, °F)
$${{{\text{t}}_{\text{i}}}}$$ = inlet air temperature (°C, °F)
$${{{\text{h}}_{\text{o}}}}$$ = outlet moist air enthalpy (kJ/kg, Btu/lb)
$${{{\text{h}}_{\text{i}}}}$$ = inlet moist air enthalpy (kJ/kg, Btu/lb)
Related Questions on Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in
A. Melting of ice
B. Boiler furnaces
C. Condensation of steam in condenser
D. None of these
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in
A. Electric heater
B. Steam condenser
C. Boiler
D. Refrigerator condenser coils
The radiation emitted by a black body is known as
A. Black radiation
B. Full radiation
C. Total radiation
D. All of these

Join The Discussion