JEPPIAAR ENGINEERING COLLEGE
CHENNAI
DEPARTMENT OF MECHANICAL ENGINEERING
113301 – ENGINEERING THERMODYNAMICS
UNIT – 1 : ASSIGNMENT QUESTIONS

1. A piston and cylinder machine contains a fluid system which passes through a complete cycle of four processes. During a cycle, the sum of all heat transfers is -170kJ. The system completes 100 cycles per min. Complete the following table showing the method for each item, and compute the net rate of work output in kW.

2. Air at 1.02 bar, 22ᵒC, initially occupying a cylinder volume of 0.015 m3 is compressed reversibly and adiabatically by a piston to a pressure of 6.8 bar. Calculate : (i) the final temperature, (ii) the final volume & (iii) the work done. (Ans: T2=507.25 K, V2= 0.003869, W=24.513kJ)

3. Air at 30ᵒC and 1 bar is compressed reversibly and polytropically from 5m3 to 1m3 . Calculate the final temperature, pressure and also the work done and heat transfer if the index of compression is 1, 1.4 and 0.9 respectively. Assume Cp=1.005kJ/kgK and Cv=0.7178 kJ/kgK.

4. 2m3 of H2 at a pressure of 1 bar and 20ᵒC is compressed isentropically to 4 bar. The same gas is expanded isothermally restored to o9riginal volume by constant volume heat rejection...

...czyET 3200 – EngineeringThermodynamics
Homework Assignment #6
Due June 15, 2013 @ 5:00 PM
Problem 4.8 - A Home Heat Pump for Space Heating
We wish to do a preliminary thermodynamic evaluation of a 1kW input power home heat pump system for space heating using refrigerant R134a. Consider the following system flow diagram
Thus the heat pump system absorbs heat from the evaporator placed outside in order to pump heat into the air flowing through...

...First Law-Exercise:
Problem 1: A volume 10 m3 contains 8 kg of oxygen at a temperature of 300 K. Find the work necessary to decrease the volume to 5 m3, (a) at a constant pressure and (b) at constant temperature. (c) What is the temperature at the end of the process in (a)? (d) What is the pressure at the end of process in (b)? (e) Show both processes in the p-V plane. Problem 2: The temperature of an ideal gas at an initial pressure p1 and volume V1 is increased at constant volume until the...

...Thermodynamics Lab
Introduction:
Thermodynamics is the study of energy which can exist in many forms, such as heat, light, chemical energy, and electrical energy. The variables that thermodynamics can be used to define include temperature, internal energy, entropy, and pressure. Temperature, relating to thermodynamics, is the measure of kinetic energy in the particles of a substance. Light is usually linked to absorbance and emission...

...Chapter 6
Introduction to thermodynamics
Topics First law of thermodynamics. Deﬁnitions of internal energy and work done, leading to dU = dq + dw. Heat capacities, Cp = CV + R. Reversible and irreversible processes. Various types of expansion, isothermal, adiabatic. CV and Cp according to kinetic theory, monatomic gases, other gases. The meaning of temperature, empirical temperature scale, perfect gas scale, the second law of thermodynamics,...

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APPLICATION OF THERMODYNAMICSTHERMODYNAMIC OF GASES
(ADIABATIC CHANGE)
In thermodynamic of gases, we can study about the changes to the internal energy of gas and factors affecting the internal energy. Thermodynamic also involves work done and heat supplied or lost by a gas.
THERMODYNAMICS
The study of temperature, heat, and related macroscopic properties comprises the branch of physics....

...COMSATS – LANCASTER
(Dual Degree Program)
EEE-112 Engineering Mechanics and Thermodynamics
Assignment # 1 Submission date: Mon, Sep 17, 2012
1. A certain fluid at 10 bar is contained in a cylinder behind a piston, the initial volume being 0.05 m3. Calculate the work done by the fluid when it expands reversibly:
a. at constant pressure to a final volume of 0.2 m3;
b. according to a linear law to a final volume of 0.2 m3 and a final pressure...

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saturated vapor enters the turbine. The condenser pressure is
6 kPa. Determine
(a) the thermal efficiency.
(b) the back...

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THERMODYNAMICS - THEORY
A control volume may involve one or more forms of work at the same time. If the boundary of the control volume is stationary, the moving boundary work is zero, and the work terms involved are shaft work and electric work. Another work form with the fluid is flow work.
Flow Work (Flow Energy)
A Flow Element
Flow Work with Imaginary Piston
Click to View Movie (68 kB)
Work is needed to push the fluid into...