Find power rating of electric heater required to maintain

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Reference no: EM13314335

A room 7m x 6m x 3m high is to be electically heated to maintain the inside temperature at 20 C, when it is 0 C outside. The room has 2 windows each 1.2m x 1.8m and a sliding glass door 2.4m x 2.1m. The transmission coefficients u in Wm^2/C are given below.

Floor: concrete slab (100mm thick) : 11.5 W/m^2/C

Walls: Cavity Brick (280mm thick) : 2.0 W/m^2/C

Windows and door (Single glazed) : 5.8 W/m^2/C

Ceiling: (do not consider a roof) : 1.0 W/m^2/C

Ignore the effects of furnishings, presence of humans, orientation to sun or any wind exposure

Assume:

There is no requirement to heat the air in the room

Calculate the power rating of the electric heater required to maintain the required temperature.

Reference no: EM13314335

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