Question: A concrete wall, which has a surface area of 20 m 2 and is 0.30 m thick, separates conditioned room air from ambient air. The

A concrete wall, which has a surface area of 20 m² and is 0.30 m thick, separates conditioned room air from ambient air. The temperature of the inner surface of the wall is maintained at 25°C, and the thennal conductivity of the concrete is 1 W/m. K.

(a) Determine the heat loss through the wall for outer surface temperatures ranging from - 15°C to 38°C, which correspond to winter and summer extremes, respectively. Display your results graphically.

(b) On your graph. also plot the heat loss as a function of the outer surface temperature for wall materials having thermal conductivities of 0.75 and 1.25 W/m . K. Explain the family of curves you have obtained.

Step by Step Solution

★★★★★

3.48 Rating (158 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

KNOWN Inner surface temperature and thermal conductivity of a concrete wall FIND Heat loss by conduc... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

8-P-T-H-M-T (2).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

A concrete wall with a surface area of 20 m 2 and a thickness of 0.30 m separates conditioned room air from ambient air. The temperature of the inner surface of the wall (T 1 ) is maintained at 25C....

A large Styrofoam cooler has a surface area of 1.0 m2 and a thickness of 2.5 cm. If 5.0 kg of ice at 0oC is stored inside and the outside temperature is a constant 35oC, how long does it take for all...

A black wood stove has a surface area of 1.20 m2 and a surface temperature of 175C. What is the net rate at which heat is radiated into the room? The room temperature is 20C.

1 . 4 A concrete wall, which has a surface area of 2 0 m 2 and is 0 . 3 0 m thick, separates conditioned room air from ambient air. The temperature of the inner surface of the wall is maintained at 2...

Question 1 : ( 3 0 marks ) A concrete wall, which has a surface area of 2 0 m 2 and is 0 . 3 0 m thick, separates conditioned room air from ambient air. The temperature of the inner surface of the...

A concrete wall, which has a surface area of 2 0 m 2 and is 0 . 3 0 m thick, separates conditioned room air from ambient air. The temperature of the inner surface of the wall is maintained at 2 5 C ,...

What do the rungs on a ladder diagram represent? a- circuit load b- diagram stand for something diff c- the line voltage power.

kindly solve the question Consider a long solid tube, insulated at the outer radius r2 and cooled at the inner radius ri, with uniform heat generation q (W/m ) within the solid. 1. Obtain the general...

ANSWER ALL QUESTIONS. WILL GIVE A GOOD RATING FOR A CORRECT ANSWERS ONLY 2-35E A spring whose spring constant is 200 lbf/in has an initial force of 100 lbf acting on it. Determine the work, in Btu,...

21. [0.66/1 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYSZO16 13.6.P.050. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) What is the vapor pressure (in Pa) of water at 25C ? 3171.47 Pa (b) What...

True, False, or Uncertain : In a risk-neutral world, all assets earn a zero rate of return.

What is the force F on the 1.0nC charge in the middle of figure 2 due to the four other charges? Give your answer in component form -2.0 nC 2.0 nC 1.0 cm 1.0 cm 1.0 nC -2.0 nC 2.0 nC

Feedback loops: Option A (a) Bring the system back into balance, which is sometimes termed "negative feedback" Option B (b) Moves the system toward change, which is sometimes termed "positive...

What amount did the owner of a $5000-face-value compound-interest Series S128 Canada Savings Bond receive when she redeemed the bond on a. November 1, 2015? b. August 21, 2016?

The number of lightning strikes on a square kilometer of open ground in a year has mean 6 and standard deviation 2.4. The National Lightning Detection Network (NLDN) uses automatic sensors to watch...

Imagine a debate on the following assertion: Behavioral scientists should only conduct research that has immediate practical applications. Develop arguments that support (pro) and oppose (con) the...

Visit the website of the Bank of Canada, www.bankofcanada.ca. Click Rates and Statistics and then Exchange Rates. a. What are the fundamental determinants of exchange rates? b. What are the different...

A categorical variable has three categories with the following frequency of occurrence: Category Frequency A 13 B 28 C 9 a. Calculate the percentage of values in each category. b. Construct a bar...

Consider using the experimental methodology of Problem 4.70 to determine the convection coefficient distribution about an airfoil of complex shape. Accounting for conduction in the metal sheathing...

Consider a two-dimensional, straight triangular fin of length L = 50 mm and base thickness t = 20 mm. The thermal conductivity of the fin is k = 25 W/m K. The base temperature is T b = 50C, and the...

A thin-walled tube with a diameter of $12 \mathrm{~mm}$ and length of $25 \mathrm{~m}$ is used to carry exhaust gas from a smoke stack to the laboratory in a nearby building for analysis. The gas...

Repeat Problem 8.52 for a circular tube of diameter $D=2 \mathrm{~mm}$, an applied heat flux of $q^{\prime \prime}=200,000 \mathrm{~W} / \mathrm{m}^{2}$, and a mass flow rate of \(\dot{m}=10...

Oil at $150^{\circ} \mathrm{C}$ flows slowly through a long, thin-walled pipe of 35-mm inner diameter. The pipe is suspended in a room for which the air temperature is $25^{\circ} \mathrm{C}$ and...

2. Benefits of eating organic. After 5 days, the proportion of fruit flies eating organic soybeans still alive is 0.90, while the proportion still alive eating conventional soybeans is 0.84. The...