Consider a house that has a 10-m x 40-m base and a 4-m-high wall. All four walls of the house have an R-value of 2.50 m2 · °C/W. The two 10-m x 4-m walls have no windows. The third wall has four windows made of 0.5-cm-thick glass (k = 0.78 W/m · °C), 2 m x 2 m in size. The fourth wall has the same size and number of double-paned windows, with a 1.2-cm-thick stagnant air space (k =
Consider a house that has a 10-m x 40-m base and a 4-m-high wall. All four walls of
the house have an R-value of 2.50 m2 · °C/W. The two 10-m x 4-m walls have no
windows. The third wall has four windows made of 0.5-cm-thick glass (k = 0.78 W/m ·
°C), 2 m x 2 m in size. The fourth wall has the same size and number of double-paned
windows, with a 1.2-cm-thick stagnant air space (k = 0.026 W/m ·°C) enclosed
between two 0.5-cm-thick glass layers. The thermostat in the house is set at 22 °C and
the average temperature outside at that location is 2°C during the four months long
heating season, Solve for the money this household will save per heating season by
converting the single-pane windows to double-pane windows. Consider that the house
is electrically heated and the price of electricity is $0.10/kWh.
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