(a) Let's say that it is chilly To outside, and a much warmer T; inside. If we were to have a single-pane window (which is made of a single piece of glass) with a thickness w and an area A, write an equation for (i) the flux of heat Fh across the window; and (ii) the flow of heat Qh across the window. What are the units of Fh and Qn? (b) Determine values for Fh and Qn assuming that T, = -15°C, T; = +20°C, w =7 mm, and A = 0.8 m². (c) If there are about nw = 20 such windows in the house, and energy costs 10 cents (US) per kilowatt-hour (kWh), estimate the heating bill per month (in US dollars) just to offset losses through the windows? [And now you can see why double-paned windows, which are much more insulating, are normal in cold climates!]
(a) Let's say that it is chilly To outside, and a much warmer T; inside. If we were to have a single-pane window (which is made of a single piece of glass) with a thickness w and an area A, write an equation for (i) the flux of heat Fh across the window; and (ii) the flow of heat Qh across the window. What are the units of Fh and Qn? (b) Determine values for Fh and Qn assuming that T, = -15°C, T; = +20°C, w =7 mm, and A = 0.8 m². (c) If there are about nw = 20 such windows in the house, and energy costs 10 cents (US) per kilowatt-hour (kWh), estimate the heating bill per month (in US dollars) just to offset losses through the windows? [And now you can see why double-paned windows, which are much more insulating, are normal in cold climates!]
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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I need help on this fourniers Law Problem. Assume it is winter and the thermal conductivity of glass k = 0.85 W/m K.
![(a) Let's say that it is chilly To outside, and a much warmer T; inside. If we were to have a single-pane window
(which is made of a single piece of glass) with a thickness w and an area A, write an equation for (i) the flux
of heat Fh across the window; and (ii) the flow of heat Qh across the window. What are the units of F, and
Qn?
(b) Determine values for Fh and Qh assuming that To = -15°C, T¡ = +20°C, w = 7 mm, and A = 0.8 m2.
(c) If there are about nw
(kWh), estimate the heating bill per month (in US dollars) just to offset losses through the windows? [And
now you can see why double-paned windows, which are much more insulating, are normal in cold climates!]
20 such windows in the house, and energy costs 10 cents (US) per kilowatt-hour](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F03b7918c-d94c-4943-a460-522394a4ae27%2F251774d3-ccbf-4e9e-adb3-f06c50dfb171%2Fip2n7l_processed.png&w=3840&q=75)
Transcribed Image Text:(a) Let's say that it is chilly To outside, and a much warmer T; inside. If we were to have a single-pane window
(which is made of a single piece of glass) with a thickness w and an area A, write an equation for (i) the flux
of heat Fh across the window; and (ii) the flow of heat Qh across the window. What are the units of F, and
Qn?
(b) Determine values for Fh and Qh assuming that To = -15°C, T¡ = +20°C, w = 7 mm, and A = 0.8 m2.
(c) If there are about nw
(kWh), estimate the heating bill per month (in US dollars) just to offset losses through the windows? [And
now you can see why double-paned windows, which are much more insulating, are normal in cold climates!]
20 such windows in the house, and energy costs 10 cents (US) per kilowatt-hour
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