consider a house that has a 10-m x 20-m base and a 4-m-high wall. all four walls of the house have an r-value of 2 31m2 "cw. the two 10-m x 4-m walls have no windows. the third wall has five windows made of 0.5-cm-thick glass ( 0.78 wim-k), 1.2m x 1.8m in sine. the fourth wall has the same size and number of windows, but they are double paned with a 15-cm-thick air o som-thick glass layers. the thermostat in the house is set at 24°c and the average emperature outside at that location is 8 c during the five-month-long heating season. sregarting any direct radiation gain or loss through the windows and taking the heat stagnant air space (k 0.026 w/mk) enclosed between two transfer coefficients at the inner and outer surfaces of the house to be 7 and 18w/mk, respectively, determine: () the average rate of heat transfer through the fourth wall with double paned window. (hint: (2) if the house is electrically heated and the price of electricity is y1/kwh, determine the real = r-value/awal) amount of money this household will save per heating season by converting the single-pane windows in the third wall to double-pane windows (assume the heat loss in the third wall with single-pane windows is 4534w).