The walls of the refrigerated storage room are 10 m long and 3 m high and constructed with 100 mm concrete blocks (k = 0.935 W / [m ° C]) and 14 cm fiberglass insulation board (k = 0.048 W). / [m °...

The walls of the refrigerated storage room are 10 m long and 3 m high and constructed with 100 mm concrete blocks (k = 0.935 W / [m ° C]) and 14 cm fiberglass insulation board (k = 0.048 W). / [m ° C]). The cold room temperature is -10 ° C and the convective heat transfer coefficient is 40 W / (m² K); the outside air temperature is 30 ° C with the outer wall surface convection heat transfer coefficient of 10 W / (m² K). Calculate the overall heat transfer coefficient. Overall heat transfer coefficient = AnswerW / (m² K).