Sensible Heat Ratio  SHR
The ratio Sensible Heat (or Cooling) Load to the Total Heat (or Cooling) Load.
The Sensible Heat Ratio  SHR  is used to describe the ratio of sensible heat load to total heat load and can be expressed as:
SHR = q _{ s } / q _{ t }
= q _{ s } / (q _{ s } + q _{ l } ) (1)
where
SHR = sensible heat ratio (ratio of sensible heat load to total heat load)
q _{ s } = sensible heat load (kW, Btu/hr)
q _{ t } = total heat load  sensible heat and latent heat (kW, Btu/hr)
q _{ l } = latent heat load (kW, Btu/hr)
For an air flow (1) can be modified to:
SHR = c_{p} (t _{ o }  t _{ i } ) / (h _{ o }  h _{ i } ) (2)
where
c_{p} = specific heat air (1.005 kJ/kg ^{o}C, 0.240 Btu/lb ^{o}F)
t _{ o } = outlet air temperature ( ^{o}C, ^{o}F)
t _{ i } = inlet air temperature ( ^{o}C, ^{o}F)
h _{ o } = outlet moist air enthalpy (kJ/kg, Btu/lb)
h _{ i } = inlet moist air enthalpy (kJ/kg, Btu/lb)
Example  SHR for a room
The inlet temperature to a room with some people is 20 ^{o}C . The relative moisture of the inlet air is 50% . From the Mollier chart the enthalpy of the inlet air is 37 kJ/kg .
The outlet temperature is 26 ^{o}C and the relative moisture of the outlet air is 40% . From the Mollier chart the enthalpy of the outlet air is 47 kJ/kg .
The Sensible Heat Ratio can be calculated as
SHR = (1.005 kJ/kg ^{o}C ) (( 26 ^{o}C )  ( 20 ^{o}C ) ) / (( 47 kJ/kg )  (3 7 kJ/kg ))
= 0.6
60% of the load provided to the room heats the air (sensible load) and 40% of the load provided humidifies the air (latent load).
Example  SHR for a evaporator
If the SHR value for an evaporator is 75% (0.75)  75% of the load cools the air (sensible load) and 25% of the loads dehumidifies the air (latent load).
General Design Values
 Auditoriums, Theaters  SHR : 0.65  0.75
 Apartments  SHR : 0.80  0.95
 Banks, Court Houses, Municipal Buildings  SHR : 0.75  0.90
 Churches  SHR : 0.65  0.75
 Dining Halls  SHR : 0.65  0.80
 Computer Rooms  SHR : 0.80  0.95
 Cocktail Lounges, Bars, Taverns, Clubhouses, Nightclubs  SHR : 0.65  0.80
 Jails  SHR : 0.80  0.95
 Hospital Patient Rooms, Nursing Home, Patient Rooms  SHR : 0.75  0.85
 Kitchens  SHR : 0.60  0.70
 Libraries, Museums  SHR : 0.80  0.90
 Malls, Shopping Centers  SHR : 0.65  0.85
 Medical/Dental Centers, Clinics and Offices  SHR : 0.75  0.85
 Motel and Hotel Public Areas  SHR : 0.75  0.90
 Motel and Hotel Guest Rooms  SHR : 0.80  0.95
 Police Stations, Fire Stations, Post Offices  SHR : 0.75  0.90
 Precision Manufacturing  SHR : 0.80  0.95
 Restaurants  SHR : 0.65  0.80
 Residences  SHR : 0.80  0.95
 Retail, Department Stores  SHR : 0.65  0.90
 Other Shops  SHR : 0.65  0.90
 School Classrooms  SHR : 0.65  0.80
 Supermarkets  SHR : 0.65  0.85
Related Topics

Air Conditioning Systems
Design of Air Conditioning systems  heating, cooling and dehumidification of indoor air for thermal comfort. 
Air Psychrometrics
Moist and humid air calculations. Psychrometric charts and Mollier diagrams. Aircondition systems temperatures, absolute and relative humidities and moisture content in air.
Related Documents

Cooling and Heating Equations
Latent and sensible cooling and heating equations  imperial units. 
Cooling Load  Latent and Sensible Heat
Latent and sensible cooling loads to consider when designing HVAC systems. 
Great Sensible Heat Factor  GSHF
The Great Sensible Heat Factor is the ratio sensible to total heat in a cooling coil. 
Heat Index
Equivalent heat index vs. air temperature and relative humidity  in degrees Fahrenheit and Celsius. 
Heat Recovery Efficiency
Classification of heat recovery efficiencies  temperature efficiency, moisture efficiency and enthalpy efficiency  online heat exchanger efficiency calculator. 
HVAC Abbreviations
Commonly used HVAC abbreviations. 
Indoor Relative Humidity vs. Outdoor Relative Humidity and Temperature
Recommended indoor relative humidity vs. outdoor relative humidity and temperature. 
Latent Heat Flow
Latent heat is the heat when supplied to or removed from air results in a change in moisture content  the temperature of the air is not changed. 
Room Sensible Heat Factor  RSHF
Room Sensible Heat Factor  RSHF  is defined as the sensible heat load divided by the total heat load in a room 
Sensible Heat Flow
Sensible heat is dry heat causing change in temperature but not in moisture content