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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.%

Elements Of Electromagnetics
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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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/(mK) 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 a 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)? m². K/W 0.977 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.% Need Help? Read It
Transcribed Image Text: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/(mK) 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 a 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)? m². K/W 0.977 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.% Need Help? Read It
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