Question

Problem 3.002 x Your answer is incorrect. Try again. A new building to be located in a cold climate is being designed with a basement that has an L-200-mm-thick wall. Inner and outer basement wall temperatures are T- 20°C and T. 0°C, respectively. The architect can specify the wall material to be either aerated concrete block with kac = 0.45 W/mK, or stone mix concrete. To reduce the conduction heat flux through the stone mix wall to a level equivalent to that of the aerated concrete wall, what thickness of extruded polystyrene sheet ( 35 kg/m) must be applied onto the inner surface of the stone mix concrete wall? Floor dimensions of the basement are 20 mx 30 m, and the expected rental rate is $50/m/month. What is the yearly cost, in terms of lost rental income, if the stone mix concrete wall with polystyrene insulation is specified? Thickness of extruded polystyrene sheet is 11.57 1694.2857 The yearly cost is $ Physical Properties Mathematical Functions

Answer 1

Aw3 20 C Ti To 0°c Kat 0.45 W]M-K 3 5 1m 'Kps 0027W m. K Ksm, W m.K 50 m2 month Kac (Ti-To (20-0) o.45 2 = 45 Ti-To Kps Ksm 20- O 5 0.027 -3 2610 Cs Scanned with CamScanner

3.1420 X10(20+30) Y 2 Arear o.81426 m2 R 50 x12 X0.D1 8856/ per year Cs Scanned with CamScanner