Windows are a major source of heat loss from a house because glass has a higher thermal conductivity than the other materials typically used in construction and because insulation can be placed inside walls but not windows. A typical house has 30 m² of windows, and window glass is typically 4.0 mm thick. Part A What is the rate of heat loss through windows on a chilly -5°C day from a typical house with single- pane windows if the interior temperature of the house is 20°C (68°F)? Express your answer with the appropriate units. P = 150 kW Submit Previous Answers ✓ Correct Part B Double-pane windows are two panes of glass separated by a 3.0-mm-wide gap filled with dry air. The gap has to be narrow to prevent convection currents in the air. Air is such a better insulator than glass that, to a good approximation, the thermal conductivity of a double-pane window is simply that of the layer of air. What is the rate of heat loss on the -5°C day if the house has double-pane windows? Express your answer with the appropriate units. P = 4500 μA J S ?

Windows are a major source of heat loss from a house because glass has a higher thermal conductivity than the other materials typically used in construction and because insulation can be placed inside walls but not windows. A typical house has 30 m² of windows, and window glass is typically 4.0 mm thick. Part A What is the rate of heat loss through windows on a chilly -5°C day from a typical house with single- pane windows if the interior temperature of the house is 20°C (68°F)? Express your answer with the appropriate units. P = 150 kW Submit Previous Answers ✓ Correct Part B Double-pane windows are two panes of glass separated by a 3.0-mm-wide gap filled with dry air. The gap has to be narrow to prevent convection currents in the air. Air is such a better insulator than glass that, to a good approximation, the thermal conductivity of a double-pane window is simply that of the layer of air. What is the rate of heat loss on the -5°C day if the house has double-pane windows? Express your answer with the appropriate units. P = 4500 μA J S ?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

Question

Windows are a major source of heat loss from a
house because glass has a higher thermal
conductivity than the other materials typically used
in construction and because insulation can be
placed inside walls but not windows. A typical
house has 30 m² of windows, and window glass is
typically 4.0 mm thick.
Part A
What is the rate of heat loss through windows on a chilly -5°C day from a typical house with single-
pane windows if the interior temperature of the house is 20°C (68°F)?
Express your answer with the appropriate units.
P = 150 kW
Submit
Previous Answers
Correct
Part B
Double-pane windows are two panes of glass separated by a 3.0-mm-wide gap filled with dry air.
The gap has to be narrow to prevent convection currents in the air. Air is such a better insulator than
glass that, to a good approximation, the thermal conductivity of a double-pane window is simply that
of the layer of air. What is the rate of heat loss on the -5°C day if the house has double-pane
windows?
Express your answer with the appropriate units.
I
P = 4500
μA
J
S
Submit Previous Answers Request Answer
?

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Step 2: Part A) Heat loss can be calculated as,

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Step 3: Substituting these values we get,

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Step 4: Part B) Heat loss through double pane window,

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