Electrically heated draw batch furnaces are commonly used in the heat treatment industry. consider a draw batch furnace front made of a 20-mm thick steel plate with a thermal conductivity of 37 w/m·k. the furnace is situated in a room with surrounding air temperature of 20°c and an average convection heat transfer coefficient of 10 w/m2·k. if the inside surface of the furnace front is subjected to uniform heat flux of 5 kw/m2 and the outer surface has an emissivity of 0.30, determine the inside surface temperature of the furnace front in k. (round your answer up to 2 decimal places.) the stefan–boltzmann constant is 5.67 × 10-8 w/m2 . k4

Determine the time of the day and month of the year at which the peak sensible cooling load occurs for a top floor, north-eastern corner room of an office building in durban for the following conditions: floor area: 8 x 8 x 3 m east and north walls: 115 mm face brick (outside), 20 mm air space, 115 mm ordinary brick (inside) with 15 mm plaster roof construction: suspended plasterboard ceiling, 450 mm air space, 150 mm concrete, 75mm screed, waterproofing no heat transfer across other surfaces window area 3x 1,5 m high in north wall only. ordinary glass with venetian blinds. lights and occupants : from 07: 00 to 18: 00 average light density: 25 w/m2 number of occupants : 5 seated, light office work room temperature 24°c