A 1,135 ft², 8 in. thick concrete wall has inside and outside surface temperatures of 19°C and 8°C. A 2 in. insulation batt with a thermal conductivity of k= 0.03 Btu/(h· ft °F) is added to the wall. Determine the reduction in heat transfer rate. What is the thickness of the insulation in meters? 0.0508 ✔m What is the thermal conductivity value of the insulation batt in W/(mK)? 0.05189 ✓ W/(m .K) What is the R-value of the concrete wall (in m². K/W)? 0.133 x Your response is within 10% of the correct value. This may be due to roundoff error, or you could have mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. m². K/W What is the R-value of the insulation batt (in m². K/W)? 0.977 ✔m². K/W What is the heat transfer rate (in W) when the insulation is added? 1046.04 ✔ W What is the percent reduction in the heat transfer rate? 89.82 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error.%
A 1,135 ft², 8 in. thick concrete wall has inside and outside surface temperatures of 19°C and 8°C. A 2 in. insulation batt with a thermal conductivity of k= 0.03 Btu/(h· ft °F) is added to the wall. Determine the reduction in heat transfer rate. What is the thickness of the insulation in meters? 0.0508 ✔m What is the thermal conductivity value of the insulation batt in W/(mK)? 0.05189 ✓ W/(m .K) What is the R-value of the concrete wall (in m². K/W)? 0.133 x Your response is within 10% of the correct value. This may be due to roundoff error, or you could have mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. m². K/W What is the R-value of the insulation batt (in m². K/W)? 0.977 ✔m². K/W What is the heat transfer rate (in W) when the insulation is added? 1046.04 ✔ W What is the percent reduction in the heat transfer rate? 89.82 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error.%
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.10P: 1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss...
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I JUST NEED HELP WITH THE RED MARKED AREAS, THANKS!
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