Aradiator may be treated as a block body with a true surface area of 6m2 and an envelope area of 4m2. it has a surface temperature of 40°c and is situated in a dark room at 20°c. the surface heat transfer coefficient is 4w/m²k. calculate the radiated heat transfer and the convected heat transfer rate. calculate the radiated surface heat transfer coefficient and obtain the same answer using it.

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?