Book - School of Science and Technology

Miscellaneous allowances 57This effect will be greatest with a convection type system, i.e. one which relies upon themovement of warmed air to heat the space, as is the case with forced and naturalconvectors and most forms of conventional radiators. Where the radiant component ofsystem output is greater, as is the case with metal radiant panels, heated ceilings andfloors, etc., a much more uniform temperature exists over the height of the space and, inthe case of floor heating, there is virtually no temperature gradient whatsoever.3.0Heated panelsRadiator Baseboard Floor CeilingRoom height m2.01.0015 20 25 15 20 25 15 20 25 15 20 25Air temperatures °CFigure 2.13 Vertical temperature gradients assuming heated rooms above and below3.0Warm air heatersLow level inlet High level inlet Bare roof108Room height m2.01.064Unit heightInsulated roofUnit height20015 20 25 15 20 2510 20 30 40Air temperatures °CFigure 2.14 Vertical temperature gradients with warm air heating