The following information is available for a company’s maintenance cost over the last seven months. Month Units Produced Maintenance Cost
June 90 $ 3,750
July 180 4,700
August 130 3,950
September 160 4,400
October 220 5,300
November 250 5,600
December 90 3,200

Using the high-low method, estimate both the fixed and variable components of its maintenance cost.

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window