Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 1500F and 500F, respectively. Determine the rate of heat transfer by radiation between the plates in Btu/hft2 and the radiative heat transfer coefficient in Btu/hft2F and in W/m2K. 1. In the natural hot water heating system the boiler is =Under the radiators Above the radiators Inside of the radiators Any of these