Final control questions on the subject “heat engineering” The purpose and function of the subject. Working parameter. Status parameters. Base words and phrases

10. Karno cycle and Karno's theorem. 
 
Base words and phrases: cycle, straight cycle, definitions, Karno's theorem, definition of 
Karno, equation. 
This cycle is the most ideal cycle among the cyclic processes, two isothermal, 
consists of two adiabatic processes. Its two diagrams 
we draw its appearance. 
Worker from the source of heat from point a 
heat is supplied to the body, so the result is an isothermal expansion process 
will happen. The expansion process is adiabatic along the process b 
continues, due to the lack of heat exchange with the external environment 
due to internal energy change. 
From the point C, the compression process begins, which heat 

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at the expense of taking it to a cold source with a low temperature 
is increased. 
Hence, the cd process is an isothermal compression process. Compression process s 
internal energy adiabatically through the process of not ending at the point 
is carried out at the expense of change. Thus, the working body is its own 
leaving the initial position, aw al expands and then narrows again 
returns to its previous state, that is, the work is done. 
The useful duty factor of any arbitrary taken cycle is as follows 
is determined using an expression. 
where: r)t is the useful work coefficient % 
q1 - amount of heat supplied J, kJ 
q1=
∆sT, 
q2 is the amount of removed heat J, kJ 
Q2=
∆T2 
useful work coefficient using the following expression for the Carnot cycle 
we can write: 
where: T, is the temperature of the hot water, °K; 
T2 is the temperature of the cold reservoir, "K. 
The useful work coefficient of the heating cycle is the heat source 
determined by the temperature of the refrigerator. 
(82) 
(83) 
h,k< l, (60%) 
For the reverse Carnot cycle