Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
thumb_up100%
Chapter 8, Problem 9P
To determine
Find the required minimum (ability of conduct heat)
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Consider a house that is approximated as a cube that is 8 m on a
side and has no windows. The house loses heat from the four
walls and the roof. For an inside temperature of 20°C and an
outside temperature of –20°C, it is desired to keep the total heat
loss less than 5 kW. What is the minimum RSj value that is
required for the walls and roof?
6
The concrete wall of a building is 0.114 m thick. The temperature inside the building is 23.4 °C, while the temperature outside is 0.0 °C.
Heat is conducted through the wall. The outside of the wall loses the energy only due to radiation. What is the emissivity of the wall?
Number
i
Units
Conduction
L
Radiation
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- Solve this problem.arrow_forwardA line was measured to be 412 m using a 30-m tape, which is of standard length at a temperature of 20 deg.C. During measurement, the temperature was 52 deg.C. If the coefficient of thermal expansion of the tape material is 0.0000116 m/m deg.C, calculate the correct length of the line.arrow_forwardCalculate the thermal expansion of a concrete roof with the dimensions of 40 m×110 m for a temperature increase of 50°C. Assume the coefficient of thermal expansion.arrow_forward
- An insulated steam pipe having outside diameter of 3 cm is to be covered with two layers of insulation each having a thickness of 2.5 cm. the thermal conductivity of one material is 5 times that of the other assuming that the steam pipe surface temperature and outer air temperature remain fixed . how much change in heat transfer take place if the better insulating material is next to the pipe than it is on outer side?arrow_forwardWhen the temperature was 3 deg. C, the distance from E to F was measured using a steel tape that has a standard length of 100m at 20 deg. C with a coefficient of thermal expansion of 0.0000116 / deg. C. If the correct distance from E to F is 836.5 m, what is the measured distance in meters?arrow_forwardA wire 100 meter long at 20 °C has a linear temperature coefficient of 2 * 10-51. The wire is heated and expands to a length of 100.01 m. What is the final temperature?arrow_forward
- Calculate the specific heat of the material in J/g-deg C if material of 10 kilograms raises by 2 deg C when 2000 joules of heat is added. O 100 O 50 O 0.1 O 0.2 O none of the abovearrow_forwardSteam enters a turbine at 30 bar, 300°C (u = 2750 kJ/kg, h = 2993 kJ/kg) and exits the condenser as saturated liquid at 15 kPa (u = 225 kJ/kg. h = 226 kJ/kg). Heat loss to the surrounding is 50kJ/kg of steam flowing through the turbine. Neglecting changes in kinetic energy and potential energy, the work output of the turbine (in kJ/kg of steam) isarrow_forwardA wooden shelter has walls constructed of wooden planks 1.00 cm thick. If the exterior temperature is -20.0°C and the interior is 5.00°C, find the rate of energy loss through a wall that has dimensions 1.95 m by 2.30 m.arrow_forward
- A certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.arrow_forwardI need the answer as soon as possiblearrow_forwardOn a hot summer day, the flat roof of a tall building reaches 50° C in temperature. The area of the roof is 400m2. Estimate the heat radiated from this roof to the sky in the evening when the temperature of the surrounding air or sky is at 20° C. The temperature of the roof decreases as it cools down. Estimate the rate of energy radiated from the roof, assuming roof temperatures of 50, 40, 30, and 25° C. Assume ε = 0 9 . for the roof.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
