Why The condenser saturation pressure should be kept above the atmospheric pressure in organic Rankine cycle?

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Rémi Dickes

It is not a mandatory constraint, but rather a practical issue: in case of leak in your system, you do not want to have air getting inside the ORC. Besides of contaminating your working fluid, the "non-condensable" gas will also rise your condensing pressure and degrade your conversion performance.

Youcef Ayoub Laouid

Thanks Mr @Rémi Dickes

Davide Ziviani

In addition to what Remi said: under certain conditions and working fluids, e.g. SES36, sub-atmospheric conditions can occur which require special care in handling and avoiding non-condensables in the ORC system.

Thanks Mrs Davide Ziviani , Rémi Dickes