A Thermopane window of area 10 m2 is constructed of two layers of glass, each 10 mm thick, separated by an air space of 5 mm. If the inside is at 20 oC and the outside is at -30 oC. The thermal conductivity of the glass is 0.84 W/(moC) and the thermal conductivity of the air is 0.0234 W/(moC). The rate of heat flow through a material of area A and thickness x depends on the thermal conductivity k of the material. Heat flows from the high to the low temperature side. When a steady state is reached, the same amount of heat crosses any cross sectional area per second. The thermal conductivity k is defined through the equation Q/t = -kA(T2 - T1)/x What is the rate of heat loss through the window? a) 1.1kW; b) 1.9kW; c) 2.1kW; d) 2.3kW; e) None of the above;