Radiant Light and Heat 1

Radiant Heat and Thermal Comfort in Vehicles

Infrared-reflective (IRR) treatment of automotive glass has been shown to reduce air temperature in vehicle cabins, thereby increasing fuel economy and occupant comfort. Its effect on radiant heat, however, may augment these benefits. In this study, the hypothesis that radiant heat affects subjective comfort ratings in a vehicle was tested. IRR films were systematically applied to the driver-si...

Heat Transfer Characteristics of Rowing Headgear with Radiant Heat Flow

INTRODUCTION Radiant heat gain to the head has recently been shown to affect sensation in human subjects (Buyan et al., 2006). However, only one published study has been conducted on the influence of radiant heat gain for sports headgear (Ishigaki et al., 2001). One could assume that reducing heat stress by shielding solar radiation using sports headgear would increase thermal comfort, and poss...

Radiant heat from propane jet fires

Sonic propane jet fire experiments were carried out in absence of wind, with visible flame length ranging between 2.2 and 8.1 m. The thermal radiation intensity increased with the mass flow rate and the flame length. The net heat released was also computed and a correlation for the flame length as a function of Q is proposed. The surface emissive power and the fraction of heat irradiated were e...

Measurement of Radiant Energy in Light Therapy

Radiant heat transfer of bicycle helmets and visors.

Twenty-six bicycle helmets and their associated visors were characterized for radiant heat transfer using a thermal manikin headform in a climate chamber to assess their ability to protect the wearer from heating by the sun. A single configuration for applied radiant flow of 9.3 W was used to assess the roles of the forward and upper vents and the visor. The helmets shielded 50-75% of the radia...