1. Presented by
Group 8th
Rully Efriadi
Mariatul Kibtiah
Suryaman

2. HEAT
ENGINE
Application of Second Law
Thermodynamic

3. The concept of the
second law of
thermodynamics
applied to heat engine
is equally applicable on
the internal combustion
engines used in our
cars, motorcycles,
ships, airplanes, etc.
Heat Engine

4. A heat engine takes in some works fluid
accros a cycle process where abouts (1) the
heat is absorbed of one high temperature
sources, increasing energy in machine; (2 )
change partly energies in this goes to
mechanical effort; and (3) discarding
residuary energy as a heat goes to low
temperature source.
Q Q1 Q2 W Q1 Q2
Heat Engine

5. The basic principle of
a cooler engine is
flowing heat from the
cool reservoir T2 to
the hot reservoir T1
by exerting external
effort on the system.
This principle is
opposite to that of in
aheat engine.
Cooler Engine

6. The magnitude of external work needed in a cooler
engine is formulated as follows
W = Q1 – Q2
Q1 = heat absorbed from low temperature
Q2 = heat given at high temperature
If the process happening in the color engine is
reversible, then it is called a carnot cooler (ideal
cooler) where the following equation applies
Q2 T2
Q1 T1
Cooler Engine

7. The example of cooler engine are refrigerator and air
conditioner
In refrigerator, what function as the cool reservoir is
the refrigerator’s interior (place to store foods) and
what function as the hot reservoir is the external air
around the refrigerator. The external work used to
transfer heat from the refrigerator’s interior to the
external air is obtained from the electric current
running in the system.
In an air condition, what functions as the cool reservoir
is the inside of the air conditioner, while what function
as the hot reservoir is the air outside the air conditioner
magchine.
Cooler Engine

8. If the performance of a heat engine is shown
by the efficiency of the engine, the
performance of a cooler engine is shown by its
coefficient of performance. Coefficient of
performance is defined as the ratio of values of
the heat in the cool reservoir to the work
applied in the system. In equation form,
coefficient of performanceis written as follow.
Q2 Q2 T2
CP
W Q1 Q2 T1 T2
Cooler Engine

9. The other application of thermodynamic
second law is steam engine in the train.
Heat produced through the coal
combustion is changed into mechanical
energy that can moves the train wheel.
The principle of Steam engine is same
with heat engine.
Steam Engine

10. Picture of Steam Engine

11.  Mention the application of 2nd law of
thermodynamic!
 Explain the difference of basic
principple among the heat engine and
the cooler engine!
 Which is object that the functions as
the cool reservoir and the hot
reservoir in the refrigerator and in
the air conditioner?
Exercise

12. Thanks For
You’re
Attention