Book - School of Science and Technology

190 Heat emitting equipment(a)(b)(d)(c)Figure 7.13 Steel radiators (some radiant components)examples shown should properly be called convectors. It must be emphasised thatalthough the extended surface provides additional output for a radiator having a givenfrontal area, it does so at the expense of cleanliness. The extended surface is usuallyhidden away at the rear and provides a series of small vertical air-ways which are both outof sight and notoriously difficult to clean. Figure 7.14 illustrates four of the more commontypes:(a) Single convoluted panels with additional corrugated surface added at the rear, as asupplement.(b) A flat plate panel front with additional waterway surface added at the rear to theextent that it predominates.