A closed rigid container has a volume 1m³ and holds air at 345 kPa and 20 °C. Heat is added until the temperature is 327 °C. Determine the change in internal energy . R = 287 J / kg k Cv20 = 718 J /kg k, Cv327 = 768 J / kg .k %3D a/ using an average value of specific heat b/ considering the variation of specific heat with temperature. Take AU = m Au

A closed rigid container has a volume 1m³ and holds air at 345 kPa and 20 °C. Heat is added until the temperature is 327 °C. Determine the change in internal energy . R = 287 J / kg k Cv20 = 718 J /kg k, Cv327 = 768 J / kg .k %3D a/ using an average value of specific heat b/ considering the variation of specific heat with temperature. Take AU = m Au

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter1: Heat, Temperature, And Pressure

Section: Chapter Questions

Problem 6RQ: One British thermal unit will raise the temperature of _____ 1b of water _____F.

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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

Example 2
A closed rigid container has a volume 1m³ and holds air at 345
kPa and 20 °C. Heat is added until the temperature is 327 °C.
Determine the change in internal energy .
R =
287 J / kg k
Cv20 = 718 J /kg k, Cv327 = 768 J / kg .k
%3D
a/ using an average value of specific heat
b/ considering the variation of specific heat with temperature.
Take AU = m Au

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