Optimization of parameters of organic Rankine cycle for the source of low-potential energy

by

A.V. Dologlonyan1, V.T. Matviienko2

1 Institute of Natural and Technical Systems, RF, Sevastopol, Lenin St., 28

E-mail: dologlonyan@mail.ru

2 Black Sea the highest naval awards of the Red Star school of P.S. Nakhimov, RF, Sevastopol, Dybenko St., 1a

E-mail: mvt3900@mail.ru

DOI: 10.33075/2220-5861-2019-3-153-162

UDC 621.48

 Abstract:

   It has been determined that by optimization of power of the organic Rankine cycle (ORС) there are two independent parameters – the difference between temperature of the source of low-potential energy (SLE) and the temperature of the steam at the turbine inlet (ΔT1) as well as the difference between the critical temperature of the working medium and saturation temperature of the cycle (ΔT3). It has been found that when choosing the working medium, the value of the critical temperature, the character of the working medium (“dry” or “wet”) and the ratio between its critical temperature and temperature of SLE are of the highest value.

   It has been established that at the choice of a working medium the size of critical temperature, character of the working medium (“dry” or “wet”) and a ratio between its critical temperature and temperature of SLE have the greatest value. At the temperature of a source of the low-potential energy significantly exceeding the critical temperature of the working medium, the largest power of the ORC plant is reached at value ΔT3opt = 0.

   It has been proved that the scheme with regeneration is most favorable to ORC with constant warmth of a cycle, and for the ORC plants working from SLE having constant flow rate, the scheme without regeneration is favorable.

   It has been shown that for cycles without regeneration ammonia is a universal working medium and suits very well both for work with warmth sources with high temperature, and with rather low one, while for cycles with regeneration R-1233zd can be considered as the most suitable working medium.

Keywords: organic Renkine cycle, source of low-potential energy, working medium.

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