clo
Areal thermal resistanceexact by definition
The clo is exactly 0.155 m²·K/W, defined as the insulation of a typical business suit: enough clothing to keep a resting person comfortable indefinitely at 21 °C in still air. A t-shirt and shorts is about 0.3 clo, a suit 1.0, and heavy winter clothing 3 to 4.
Watch out: The clo describes the whole clothing ensemble, not the fabric. Adding a 0.5 clo sweater to a 1.0 clo suit does not give 1.5, because layers compress and the still-air film between them is what does most of the insulating.
| 1 | 0.155 |
Introduced by Gagge, Burton and Bazett in 1941 as a unit ordinary people could reason about, and it stuck: ASHRAE Standard 55 and ISO 7730 both specify thermal comfort in clo, and the clo value of the occupants is a required input to any comfort calculation.
One clo in every areal thermal resistance unit
| 155,000 | square millimeter kelvin per watt (mm²·K/W) | |
| 1,550 | square centimeter Celsius per watt (cm²·°C/W) | |
| 126.739 | square inch hour Fahrenheit per BTU (in²·h·°F/BTU) | |
| 1.55 | tog (tog) | |
| 1 | clo (clo)this unit | |
| 0.880131 | hour square foot Fahrenheit per BTU (R (h·ft²·°F/BTU)) | |
| 0.180144 | square meter hour Celsius per kilocalorie (m²·h·°C/kcal) | |
| 0.155 | square meter kelvin per watt (RSI (m²·K/W)) | |
| 0.155 | square meter Celsius per watt (m²·°C/W) |