Effects of different cooling principles on thermal sensation and physiological responses

Applying low exergy cooling concepts in the built environment allows reduction of high quality energy sources. However, application of low exergy cooling systems can result in whole body and local discomfort of the occupants. Non-uniform thermal conditions, which may occur due to application of lowex systems, can be responsible for discomfort. However, in some cases combinations of local and general discomfort factors, for example draught under warm conditions, may not be uncomfortable. Two different cooling principles were studied: passive and active cooling. Active cooling occurred through either convection or radiation. Ten healthy male subjects (age: 20-29; BMI: 18-25) were exposed to four different experimental cases: (a) passive cooling through convection and (b) active cooling through convection, and active cooling by radiation via the (c) ceiling or (d) floor. Physiological and thermal sensation data indicate significant differences between the different cases.