Temperature Humidity Comfort Index

Heat index specifies how the human body experiences temperature and is based on subjective measurements.

Temperature humidity comfort index. Where thi is used research has identified thi values above which heat stress begins. Temperature humidity index thi combination of temperature and humidity that is a measure of the degree of discomfort experienced by an individual in warm weather. In order to create an environment with an effective comfort temperature of 70 f for every one degree fahrenheit that the average surface temperature is below 70 we will need to raise the air temperature 1 4 f to compensate for the radiant cooling of those cooler surfaces.

In order to determine the heat index using the chart above you need to know the air temperature and the relative humidity. For example if the air temperature is 100 f and the relative humidity is 55 the heat index will be 124 f. Thi has been used for estimation of the level of heat stress.

The human body will release excess heat into the environment so the body can continue to operate. The result is also known as the felt air temperature apparent temperature real feel or feels like. The heat index hi is an index that combines air temperature and relative humidity in shaded areas to posit a human perceived equivalent temperature as how hot it would feel if the humidity were some other value in the shade.

When the relative humidity is low the apparent temperature can actually be lower than the air temperature. The human body can be viewed as a heat engine where food is the input energy. Temperature humidity index values of 70 or less are considered comfortable 75 78 stressful and values greater than 78 cause extreme distress and animals are unable to maintain thermoregulatory mechanisms or normal temperature.

Comfort temperature humidity index recomm ended by the national meteorological agency dragotă cf. Mechanical contractor looking for good program to explain temp humidity comfort correlation to customer. It was originally called the discomfort index.

Temperature humidity index thi is a measure that has been used since the early 1990s. It accounts for the combined effects of environmental temperature and relative humidity and is a useful and easy way to assess the risk of heat stress. The heat index in c is given by.