GREENCo

Το σύστημα συμπαραγωγής που θα αναπτυχθεί Στο πλαίσιο του ερευνητικού έργου θα έχει θερμική και ηλεκτρική ισχύ 200 kW και 20 kW αντίστοιχα. Η σωστά ελεγχόμενη καύση της βιομάζας θα γίνεται στους 130^ooC, ενώ η θερμοκρασία συμπύκνωσης του κύκλου ORC θα είναι περίπου 50 ^οοC, και δίνεται ως θερμική ισχύς στο θερμοκήπιο. Το υπό μελέτη σύστημα θα καλύψει τις θερμικές ανάγκες θερμοκηπίου 300 m2.².Organic fluid selection: An important research element has been the selection of the appropriate working fluid. According to the European Refrigerant Regulation, also known as the F-gas Regulation, the use of organic fluids with high Global Warming Potential (GWP) has begun to be limited in order to reinforce the use of environmentally friendly fluids. In addition, all fluids should have zero Ozone Depletion Potential (ODP). In this context, and in order to ensure the future use of the Greenco unit without any restriction, the R1224yd (Z) has been chosen, which is one of the most efficient for heat transfer in the range below 120 oC and also has a low GWP.

In the context of GreenCo project, Psyctotherm successfully developed an ORC engine integrated with a 200 kW thermal biomass boiler, utilizing a combustion temperature of 130 °C. The ORC system generated up to 20 kWe, while its cooling system, operating at 50 °C, supplied heat to a greenhouse to meet its heating needs. Using HFO refrigerant, chosen for its ultra-low global warming potential (GWP) and suitability for this temperature range, the cogeneration system was installed and operated at the Agricultural University of Athens. The project demonstrated the substantial benefits of combining ORC technology with biomass boilers in agricultural applications, highlighting a practical solution for sustainable energy use and enhanced efficiency in rural energy systems.