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Important Terms for Thermodynamic Cycles

Important Terms for Thermodynamic Cycles
**Points :** Important Terms for Thermodynamic Cycles, Mean Effective Pressure, Efficiency of a Cycle, Stroke Length, Compression Ratio, Full Cylinder Volume, Clearance Volume, Cylinder Bore, Stroke Volume
Though there are many terms used in thermodynamic cycles yet the following are
important from the subject point of view.

1. Mean Effective Pressure

2. Efficiency of a Cycle

3. Stroke Length

4. Compression Ratio

5. Full Cylinder Volume

6. Clearance Volume

7. Cylinder Bore

8. Stroke Volume
1. Mean Effective Pressure
As a matter of fact, pressure in the cylinder keeps on changing with the position of the
piston for all sorts of calculations. We need the means effective pressure, which may
be defined as the constant pressure acting on the piston during the working stroke. It
will be able to d the same amount of work, as done by the actual varying. Pressure
produced during the cycles. It is ratio of work done to the displacement volume.
Mathematically, mean effective pressure.
2. Efficiency of a Cycle
It may be defined as the ratio of work done to the heat supplied during a cycle.
Mathematically, efficiency of it cycle.
3. Stroke Length
The piston move in the cylinder due to rotation of the crank. Its extreme positions are
known a Top Dead Center (TDC). The distance between the two extreme positions
known as stroke length or stroke.
4. Compression Ratio
The ratio of full cylinder volume to the clearance volume is known as compression
ratio. It is an important term in an engine.
5. Full Cylinder Volume
The volume occupied by the working fluid when the piston is at the bottom dead
centers is known as full cylinder volume. Mathematically, full cylinder volume is equal
to the sum of clearance volume and swept volume.
6. Clearance Volume
The volume occupied by the working fluid, when piston reaches the top dead centre1
is known as clearance volume. It is generally denoted by (V_{c}).
7. Cylinder Bore
The diameter of the cylinders, in which the piston moves, is known as cylinder bore.
8. Stroke Volume
The volume swept by the piston, when it moves between the two extreme positions is
known as swept volume, or stroke volume.
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