Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Sensible Heat Ratio - SHR

The ratio Sensible Heat (or Cooling) Load to the Total Heat (or Cooling) Load.

Sponsored Links

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 = qs / qt     

       =  qs / (qsql)                                                (1)

where

SHR = sensible heat ratio (ratio of sensible heat load to total heat load)

qs = sensible heat load (kW, Btu/hr)

qt = total heat load - sensible heat and latent heat (kW, Btu/hr)

ql = latent heat load (kW, Btu/hr)

For an air flow (1) can be modified to:

SHR = cp (to - ti) / (ho - hi)                                              (2)

where

cp = specific heat air (1.005 kJ/kgoC, 0.240 Btu/lboF)

to = outlet air temperature (oC, oF)

ti = inlet air temperature (oC, oF)

ho = outlet moist air enthalpy (kJ/kg, Btu/lb)

hi = inlet moist air enthalpy (kJ/kg, Btu/lb)

Example - SHR for a room

The inlet temperature to a room with some people is 20 oC. 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 oC 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/kgoC) ((26 oC) - (20 oC)) / ((47 kJ/kg) - (37 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
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

3 30

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more