Abstract
Though thermodynamic cycles have already been introduced in Sect. 17.2, this chapter covers cycles, in which the working fluid is subject to phase changes. If a system after several changes of state finally reaches the initial state, it is called a thermodynamic cycle. Thus, all state values reach their initial value, i.e.
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- 1.
Idealised in this case means, that there is no generation of entropy!
- 2.
Only the fluid flow through the heat exchanger is part of the system boundary. The environment being on a larger temperature level, and thus forming an imperfection with the fluid, is not covered.
- 3.
Since potential and kinetic energies have been ignored. Furthermore, no dissipation occurs.
- 4.
Super-cooled means, that the fluid’s temperature is lower than the boiling temperature at this pressure.
- 5.
The required energy comes from the process itself!
- 6.
Ignoring the kinetic and potential energies!
- 7.
See Fig. 13.13!
- 8.
This is since the temperature of the heat reservoir is constant!
- 9.
This imperfection is due to the \(\Delta T\) between fluid and reservoir.
- 10.
Cooling water is regarded as an incompressible liquid. There shall be no pressure drop for the cooling water!
- 11.
The generation of entropy is due to the heat transfer from ammonia to the cooling water. Since there is no pressure drop for the ammonia respectively the cooling water, there is no dissipation.
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Schmidt, A. (2019). Thermodynamic Cycles with Phase Change. In: Technical Thermodynamics for Engineers. Springer, Cham. https://doi.org/10.1007/978-3-030-20397-9_22
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DOI: https://doi.org/10.1007/978-3-030-20397-9_22
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