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.
You are required to tabulate your calculations providing one row for each part of the buildings structure and column headings of area, u and heat loss. The total heat loss should be provided at the bottom of the table. Provide a table number and a suitable caption for your table.
How did you determine the area of the walls ?