Heat flows through a wall of a house at a steady-state on a day when the temperature of the outdoor air is 2°C and the air inside the house is maintained at 27°C. The temperatures of the inner surface of the wall is 2°C cooler than indoor air temperature. And the temperature of the outer surface of the wall is 3°C warmer than the outdoor air temperature. The rate of heat transfer through the wall is 964W. Determine the rate of total entropy generation associated with this heat transfer process (in W/K).

Heat flows through a wall of a house at a steady-state on a day when the temperature of the outdoor air is 2°C and the air inside the house is maintained at 27°C. The temperatures of the inner surface of the wall is 2°C cooler than indoor air temperature. And the temperature of the outer surface of the wall is 3°C warmer than the outdoor air temperature. The rate of heat transfer through the wall is 964W. Determine the rate of total entropy generation associated with this heat transfer process (in W/K).

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

See similar textbooks

Similar questions

Calculate the quantity of heat to be transferred in BTU to 2.81 kg of brass to raise its temperature from 20.8°C to 239.4°C. The specific heat of the brass is 0.394 kJ/kg K.
A rigid box with insulated side walls is put in the air. Only the top wall and the bottom wall of the box are not insulated. Hot air at 70°C is blown over a 1m × 2m flat surface of the top wall of a box at 30°C. The convection heat transfer coefficient is 45 W/(m2 · °C). Determine the rate of heat transfer in kW from the bottom wall to the air, if you know that the temperature of the box remains constant and no heat is generated inside. Justify your answer.
A heat engine is working between 920°C and 36°C.The measured output of the heat engine is 0.17 MW and the second law efficiency of an engine is 0.58. Determine the heat supplied in kW and irreversibility in kW. Efficiency Reversible work in kJ Heat supplied in kW Irreversibility in kW
Putting hot foods into the refrigerator without cooling them first not only wastes energy but also could spoil the foods nearby. Is it true?
Define the work (boundary) done on an adiabatic system is equal to the increase in the energy of the system.
A fluid enters a machine at 188.98 m/s, 805 kPa, and with a specific volume of 0.125 m³/kg. The radiation heat loss is 24.19 kJ/kg. The internal energy decreases by 478 kJ/kg. If the fluid leaves at 329.06 m/s, 139 kPa, and 0.868 m³/kg, determine the work done by the fluid in kJ. The mass of the fluid is 1.506 kg.
a) A gas is trapped in a piston-cylinder device. The initial pressure and temperature of the gas are 500 kPa and 300 K, respectively. The system undergoes an isothermal expansion process, in which 15KJ of boundary work is done by the gas and 3KJ of paddle-wheel work is done on the gas. Determine the amount heat transfer during this process. Explain the direction of the heat transfer.
Consider two identical rooms, one with a 2-kW electric resistance heater and the other with three couples fast dancing. In which room will the air temperature rise more quickly?
A heat engine operates between two reservoirs at 200°C and 20°C. One-half of the work output of the heat engine is used to drive a compressor of a refrigeration system, which is used to cool the chiller in a factory. (i) Apples with average mass of 500 g are dropped into the chiller at a rate of 10 pieces per minute, cooling from 20°C to 4°C. Determine the heat transfer rate of the apples.
Consider a room with indoor temperature of 28°C and the outdoor temperature of 32°C. Due to the temperature different between indoor and outdoor, it is estimated that about 1.49 kW. The room contains a 150-W TV set, a 250-W refrigerator, a 45-W light bulb, and a 11-kW iron. Determine the rate of increase of the energy content of the room when all of these electric devices are on
A gas contained in a vertical cylindrical tank has a volume of 11.12 m3. The gas receives a paddle work of 7.5W for 1hour. If the density of the gas at the initial state is 1.5 kg/m3, determine the specific heat gain or loss if the specific internal energy of the gas increases by 16.2kJ/kg.
None