Sensible heat ratio. Sensible capacity divided by total capacity, so an SHR of 0.75 means three quarters of the work lowers temperature and one quarter removes moisture. Typical residential equipment runs around 0.70 to 0.80. Matching equipment SHR to the building's load SHR decides whether a space ends up both cool and dry; lowering blower speed lowers equipment SHR and improves dehumidification.
Load SHR is 0.65 in this restaurant and the unit's 0.80, it'll hit 72 and still feel like a swamp.
Also heard as
- sensible heat ratio
- S/T ratio
Related terms
Sensible heat
Heat that changes the air's temperature, which you can read on a thermometer.
Latent heat
Heat tied up in moisture, added or removed when water evaporates or condenses without changing air temperature.
Cooling load
How much heat and moisture a cooling system has to pull out of a space each hour to keep it at design conditions.
Relative humidity
The moisture in air as a percentage of what would saturate it at the same temperature, the number a humidistat shows.