Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
Gas Power Cycles
4.0 Introduction:
An important application of thermodynamics is the analysis of power cycles through
which the energy absorbed as heat can be continuo
School of Mechanical Sciences
Indian Institute of Technology, Bhubaneswar
Samantapuri, Odisha-751013, INDIA
Thermodynamics (MES 2001)
(Tutorial - 2)
1. At a certain instant a steam boiler of 1 m3 capacity contains superheated steam at
2.5 MPa and 250 C. T
School of Mechanical Sciences
Indian Institute of Technology, Bhubaneswar
Samantapuri, Odisha-751013, INDIA
Thermodynamics (ME S2001)
(Tutorial - 1)
1. A cylinder fitted with a massless piston contains 0.1 kg of saturated steam at 2 bar
as shown in Fig. 1
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.10 Brayton Cycle (Simple Gas Turbine Cycle):
3
2
4'
4
1
Volume
(a)
3
4'
2
4
1
Entropy
(b)
Fig.4.10. Brayton cycle on p-v and T-s diagram
Indian Institute of Technolo
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.7 Comparison of Otto, Diesel and Dual Cycles:
The important variable factors which are used as the basis for comparison of the cycles
are compression ratio, peak pre
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.9 Lenoir Cycle:
2
3
1
Volume
(a)
2
3
1
Entropy
(b)
Fig.4.9. Lenoir cycle on p-v and T-s diagrams
Indian Institute of Technology Madras
Gas Power Cycles
Prof. U.S.P.
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.8. Atkinson Cycle:
Atkinson cycle is an ideal cycle for Otto engine exhausting to a gas turbine. In this cycle
the isentropic expansion (3-4) of an Otto cycle (1-2-3
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.2 Stirling Cycle (Regenerative Cycle) :
The Carnot cycle has a low mean effective pressure because of its very low work
output. Hence, one of the modified forms of t
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.5 Air Standard Diesel Cycle:
Air standard diesel cycle is a idealized cycle for diesel engines. It is as shown on P-v
and T-s diagrams. The processes in the cycle ar
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.4 Air Standard Otto Cycle:
The air-standard-Otto cycle is the idealized cycle for the spark-ignition internal
combustion engines. This cycle is shown above on p-v an
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.6 Limited Pressure Cycle (or Dual Cycle):
This cycle is also called as the dual cycle, which is shown in Fig.4.6. Here the heat
addition occurs partly at constant vo
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.3 Ericsson Cycle:
The Ericsson cycle consists of two isothermal and two constant pressure processes.
The processes are:
Process 1-2: Reversible isothermal compressio
Gas Power Cycles
Prof. U.S.P. Shet , Prof. T. Sundararajan and Prof. J.M . Mallikarjuna
4.1 Carnot Cycle :
A Carnot gas cycle operating in a given temperature range is shown in the T-s diagram
in Fig. 4.1(a). One way to carry out the processes of this cyc
School of Mechanical Sciences
Indian Institute of Technology, Bhubaneswar
Samantapuri, Odisha-751013, INDIA
Thermodynamics (MES 2001)
(Tutorial - 3)
1. It is desired to maintain an auditorium at 25C throughout the year. For this
purpose it is planned to u