- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 22 Apr 2019
Dry-bulb temperature (Tdb, DBT or Td), is a measure of air temperature. It is referred to as dry-bulb temperature because the thermometer bulb is dry and so the temperature recorded does not vary with the moisture content of the air. This is as opposed to wet-bulb temperature which is the temperature recorded by a thermometer that has its bulb wrapped in cloth and moistened with distilled water. Wet-bulb temperatures are the same as dry-bulb temperatures at a relative humidity of 100%, but otherwise wet-bulb temperatures will be lower than dry-bulb temperatures due to the cooling effect of evaporation (described as wet-bulb depression).
Dry-bulb temperature can be used as to express a component of thermal comfort. For example, the wet bulb globe temperature index (WBGT) is widely used for the assessment of heat stress and combines wet-bulb temperature, dry-bulb temperature and globe temperature (mean radiant temperature).
 FIND OUT MORE
 Related articles on Designing Buildings Wiki
Featured articles and news
Overbuild and air-space developments.
Airports National Policy Statement and its impact on infrastructure.
Organisations will collaborate on infrastructure initiatives.
Technology informs procurement and planning practices.
BSRIA releases market sector growth projections.
Designing for durability and resilience.
Do plans to connect infrastructure and housing stack up?
1 minute review of CAMRA’s guide to historic drinking dens.
Their complex heritage remains largely unknown.
New editor covered facilities management, operations and construction in the US.
Exclusive log cabins on the North Antrim coastline.