Thermodynamics-1.pdf

# Ideal cycles air standard cycles otto diesel dual and

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Ideal cycles: Air standard cycles, Otto, Diesel, Dual and Brayton cycle, Comparison of Otto, Diesel and Dual cycle. Vapour cycle: Carnot and Rankine cycle, Regenerative and reheat cycle. Psychometry : Air and water-vapour mixture and their properties, adiabatic saturation, Use of psychrometry charts, Simple introduction to psychometric process.

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COURSE PLAN 1. Scope and Objective of Course: The study of energy, its forms and transformations, and the interactions of energy with matter is defined as the Thermodynamics. Hence thermodynamics is concerned with: • Concept of energy. • The law that governs the conversion of one form of energy into another. • The properties of the working substance or the media used to obtain the e nergy conversion. Thermodynamics has extremely extensive range of applications. For example, it is utilized by the mechanical engineer in the design of energy converting devices such as steam and gas turbines, internal combustion engines, fuel cells, thermoelectric generators as well as refrigerators and air- conditioning equipment. 2. Textbooks TB1: Cengel, Yunus A., and Michael A. Boles. "Thermodynamics: an engineering approach” TB2: Nag, P. K. Engineering thermodynamics 3. Reference Books RB 1:R.K Rajput RB 2:D.S Kumar
5. Evaluation Scheme: Component 1 Mid Semester Exam 20 Component 2 Attendance /Assignment Evaluation 10 Component 3** End Term Examination** 70 Total 100 ** The End Term Comprehensive examination will be held at the end of semester. The mandatory requirement of 75% attendance in all theory classes is to be met for being eligible to appear in this component.

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Mechanical Engineering Department Thermodynamics ASSIGNMENT: 1 Q 1: When a stationary mass of gas was compressed without friction at constant pressure its initial state of 0.4 m3 and 0.105 MPa was found to change to final state of 0.20 m3 and 0.105 MPa. There was a transfer of 42.5 kJ of heat from the gas during the process. How much did the internal energy of the gas change? Q 2: cylinder containing the air comprises the system. Cycle is completed as follows: (i) 82000 N-m of work is done by the piston on the air during compression stroke and 45 kJ of heat are rejected to the surroundings. (ii) During expansion stroke 100000 N-m of work is done by the air on the piston.Calculate the quantity of heat added to the system. Q 3: A tank containing air is stirred by a paddle wheel. The work input to the paddle wheel is 9000 kJ and the heat transferred to the surroundings from the tank is 3000 kJ.Determine: (i) Work done; (ii) Change in internal energy of the system. Q 4: When a system is taken from state l to state m, in Fig. 4.18, along path lqm, 168 kJ of heat flows into the system, and the system does 64 kJ of work: (i) How much will be the heat that flows into the system along path lnm if the work done is 21 kJ? (ii) When the system is returned from m to l along the curved path, the work done on the system is 42 kJ. Does the system absorb or liberate heat, and how much of the heat is absorbed or liberated? (iii) If U l = 0 and Un = 84 kJ, find the heat absorbed in the processes.

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