A piston-cylinder device (see Figure 1) is in a heated environment (its surroundings), which is at a temperature of 177°C and able to transfer heat to the device. The device contains2 kg of water which is initially at 101.42 kPa with the quality (dryness fraction) of 0.4. Heat is added to the water from the surroundings, and the water expands isothermally in aquasi-equilibrium manner until the final volume is 4.017 m3. During the expansion process, the specific work done is 171.4 kJ/kg. It can be assumed that the piston and cylinder isweightless, and that kinetic and potential energy changes are negligible. In answering the various questions, you should choose the closest answer which may be slightly differentfrom your own answer because of rounding errors or differences .Surroundings (at temperature of 177° C)Water:Initially at101.42kPa andx=0.4CylinderFigure 1What is specific heat transfer in kJ/kg from the system to the surrounding in the process? .a. 712.37, negativeb. 1424.74, negativec. 1424.74, positived. 712.37, positivea .- n - os

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Engineering

Mechanical Engineering

What is specific heat transfer in kJ/kg from the system to the surrounding in the process? .

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

A piston-cylinder device (see Figure 1) is in a heated environment (its surroundings), which is at a temperature of 177°C and able to transfer heat to the device. The device contains
2 kg of water which is initially at 101.42 kPa with the quality (dryness fraction) of 0.4. Heat is added to the water from the surroundings, and the water expands isothermally in a
quasi-equilibrium manner until the final volume is 4.017 m3. During the expansion process, the specific work done is 171.4 kJ/kg. It can be assumed that the piston and cylinder is
weightless, and that kinetic and potential energy changes are negligible. In answering the various questions, you should choose the closest answer which may be slightly different
from your own answer because of rounding errors or differences .
Surroundings (at temperature of 177° C)
Water:
Initially at
101.42
kPa and
x=0.4
Cylinder
Figure 1
What is specific heat transfer in kJ/kg from the system to the surrounding in the process? .
a. 712.37, negative
b. 1424.74, negative
c. 1424.74, positive
d. 712.37, positive
a .- n - os

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