Windows _________ more heat per square foot of area in winter and _____ more heat in summer than any other surface in the home. Group of answer choices Loose, Gain Gain, Loose Loose, Loose Gain, Gain
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The question is about how windows interact with heat in different seasons—specifically, how they lose or gain heat. Show more…
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Insulating a house You insulate your house using insulation rated as $\mathrm{R}-12$ , which will conduct 1$/ 12 \mathrm{Btu} / \mathrm{h}$ of thermal energy through each square foot of surface if there is a $1^{\circ} \mathrm{F}$ temperature difference across the material (R-12 insulation is said to have a thermal resistance $R$ of 12 $\mathrm{h} \cdot \mathrm{ft}^{2} \cdot^{\circ} \mathrm{F} / \mathrm{B} \mathrm{tu} ) .$ The conduction rate through a material of area $A$ , across which there is a temperature difference $T_{2}-T_{1},$ is $$H_{\text { Conduction }}=(1 / R) A\left(T_{2}-T_{1}\right)$$ Use this information to determine the conductive energy flow rate across (a) an 8.0 $\mathrm{ft} \times 16.0 \mathrm{ft}$ R-15 wall; (b) a $3.0 \mathrm{ft} \times 7.0 \mathrm{ft} \mathrm{R}-4$ door; and $(\mathrm{c})$ a $3.0 \mathrm{ft} \times 4.0 \mathrm{ft} \mathrm{R}-1.5$ window. Assume that the inside temperature is $68^{\circ} \mathrm{F}$ and the outside temperature is $20^{\circ} \mathrm{F} .$ (d) Convert each answer from $\mathrm{Btu} / \mathrm{h}$ to $\mathrm{J} / \mathrm{s}=\mathrm{W} .$
Problem 1 - Let's identify the heat transfer modes in Example 1.1. In Example 1.1, we identified the heat transfer modes on the double-pane window side of the room indicated in the figure below, assuming that the ambient air is cooler than the room air. Now, it is your turn to identify the heat transfer modes on the single-pane window side of the room. Please draw a schematic and discuss the implications of having double- and single-pane windows on the heating needs for this room. Double pane Ambient air Room air Single pane
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A grandmother is concerned about reducing her winter heating bills. Her strategy is to loosely fit rigid polystyrene sheets of insulation over her double-pane windows right after the first freezing weather arrives. Identify the relevant heat transfer processes on a cold winter night when the foamed insulation sheet is placed: (a) on the inner surface, and (b) on the outer surface of her window.
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