Air is contained in a vertical piston–cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 101.325 kPa on the top of the piston, which has a mass of 50 kg and a face area of 0.10 m2. Electric current passes through the resistor, and the volume of the air slowly increases by 2 ft3 while its pressure remains constant. The mass of the air is 0.32 kg, and its specific internal energy increases by 20 Btu/lb. The air and piston are at rest initially and finally. The piston–cylinder material is a ceramic composite and thus a good insulator.Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 32.0 ft/s2 Determine the heat transfer from the resistor to the air, in Btu, for a system consisting of (a) the air alone, (b) the air and the piston. Also draw the schematic diagram.Hint: Refer to example Air is contained in a vertical piston-cylinder assembly fitted with an electricalresistor. The atmosphere exerts a pressure of 101.325 kPa on the top of the piston,which has a mass of 50 kg and a face area of 0.10 m'. Electric current passesthrough the resistor, and the volume of the air slowly increases by 2 ft while itspressure remains constant. The mass of the air is 0.32 kg, and its specific internalenergy increases by 20 Btu/lb. The air and piston are at rest initially and finally.The piston-cylinder material is a ceramic composite and thus a good insulator.Friction between the piston and cylinder wall can be ignored, and the localacceleration of gravity is g = 32.0 f/s Determine the heat transfer from the resistorto the air, in Btu, for a system consisting of (a) the air alone, (b) the air and thepiston. Also draw the schematic diagram.

The change of kinetic energy is zero in this system. The change in potential energy is also zero in…

Answered: Air is contained in a vertical…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Air is contained in a vertical piston–cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 101.325 kPa on the top of the piston, which has a mass of 50 kg and a face area of 0.10 m 2 . Electric current passes through the resistor, and the volume of the air slowly increases by 2 ft3 while its pressure remains constant. The mass of the air is 0.32 kg, and its specific internal energy increases by 20 Btu/lb. The air and piston are at rest initially and finally. The piston–cylinder material is a ceramic composite and thus a good insulator. Friction between the piston and cylinder wall can be ignored, and the local acceleration of gravity is g = 32.0 ft/s2 Determine the heat transfer from the resistor to the air, in Btu, for a system consisting of (a) the air alone, (b) the air and the piston. Also draw the schematic diagram. Hint: Refer to example