0.5 kg of steam at 250°C is enclosed behind a piston in a cylinder at0.9MPa. with the piston rigidly held in position, the cylinder is cooled until thepressure is 0.7MPa. Find the condition of the steam at the lower pressure.Calculate the change in internal energy and explain why this value represent thequantity of heat transfer during the cooling process. If the amount of heat is nowtransferred back into steam while the pressure remain constant at 0.7MPa,determine the final condition of the steam. Take the specific heat of superheatedsteam as 2kJ/kg K. (0.952, -115.7kJ, superheat temperature 231.1°C)14.15.A steam turbine is developed 3000kW from steam supplied at a pressure of3 MPa and 300°C. The exhaust pressure is 7 kPa and the condition at exhaust is0.9 dry. Determine a-the required steam flow rate in kg/s b-the cross sectionalarea of the turbine exhaust if the steam velocity is 75 m/s. (4.52 kg/s, 1.114 m²)initiall1:

Givenm=0.5kgT1=250oCP1=0.9MPaP2=0.7MPa

4. 0.5 kg of steam at 250°C is enclosed behind a piston in a cylin 0.9MPa. with the piston rigidly held in position, the cylinder is cooled un pressure is 0.7MPa. Find the condition of the steam at the lower pr Calculate the change in internal energy and explain why this value repres quantity of heat transfer during the cooling process. If the amount of heat transferred back into steam while the pressure remain constant at 0. determine the final condition of the steam. Take the specific heat of supera steam as 2kJ/kg K. (0.952, -115.7kJ, superheat temperature 231.1°C) A steam turbine is davalonad 30001W from steam supplied at a pres

4. 0.5 kg of steam at 250°C is enclosed behind a piston in a cylin 0.9MPa. with the piston rigidly held in position, the cylinder is cooled un pressure is 0.7MPa. Find the condition of the steam at the lower pr Calculate the change in internal energy and explain why this value repres quantity of heat transfer during the cooling process. If the amount of heat transferred back into steam while the pressure remain constant at 0. determine the final condition of the steam. Take the specific heat of supera steam as 2kJ/kg K. (0.952, -115.7kJ, superheat temperature 231.1°C) A steam turbine is davalonad 30001W from steam supplied at a pres

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

0.5 kg of steam at 250°C is enclosed behind a piston in a cylinder at
0.9MPa. with the piston rigidly held in position, the cylinder is cooled until the
pressure is 0.7MPa. Find the condition of the steam at the lower pressure.
Calculate the change in internal energy and explain why this value represent the
quantity of heat transfer during the cooling process. If the amount of heat is now
transferred back into steam while the pressure remain constant at 0.7MPa,
determine the final condition of the steam. Take the specific heat of superheated
steam as 2kJ/kg K. (0.952, -115.7kJ, superheat temperature 231.1°C)
14.
15.
A steam turbine is developed 3000kW from steam supplied at a pressure of
3 MPa and 300°C. The exhaust pressure is 7 kPa and the condition at exhaust is
0.9 dry. Determine a-the required steam flow rate in kg/s b-the cross sectional
area of the turbine exhaust if the steam velocity is 75 m/s. (4.52 kg/s, 1.114 m²)
initiall
1:

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