Comparison of Environmentally Friendly Working Fluids for Organic Rankine Cycles

Braimakis, Konstantinos; Roumpedakis, Tryfon C.; Leontaritis, Aris-Dimitrios; Karellas, Sotiriοs

doi:10.1201/9781315368184-13

Cited by 3 publications

(2 citation statements)

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“…Based on the Montreal Protocol, a complete abolishment of chlorofluorocarbons (CFCs) was decided, due to their high ozone depletion potential (ODP) [5]. In addition, the phase out of hydrochlorofluorocarbon (HCFC) refrigerants was implemented [6]. On the other hand, the F-gas Regulation, first issued in the European Union in 2006, aimed to introduce measures for the reduction of fluorinated gases-hydrofluorocarbons (HFCs) and perfluorocarbons (PFCs)-in form of a phase-down, due to their high global warming potential (GWP) [7].…”

Section: Introductionmentioning

confidence: 99%

Design Evaluation for a Finned-Tube CO2 Gas Cooler in Residential Applications

et al. 2020

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Towards the introduction of environmentally friendlier refrigerants, CO2 cycles have gained significant attention in cooling and air conditioning systems in recent years. In this context, a design procedure for an air finned-tube CO2 gas cooler is developed. The analysis aims to evaluate the gas cooler design incorporated into a CO2 air conditioning system for residential applications. Therefore, a simulation model of the gas cooler is developed and validated experimentally by comparing its overall heat transfer coefficient. Based on the model, the evaluation of different numbers of rows, lengths, and diameters of tubes, as well as different ambient temperatures, are conducted, identifying the most suitable design in terms of pressure losses and required heat exchange area for selected operational conditions. The comparison between the model and the experimental results showed a satisfactory convergence for fan frequencies from 50 to 80 Hz. The absolute average deviations of the overall heat transfer coefficient for fan frequencies from 60 to 80 Hz were approximately 10%. With respect to the gas cooler design, a compromise between the bundle area and the refrigerant pressure drop was necessary, resulting in a 2.11 m2 bundle area and 0.23 bar refrigerant pressure drop. In addition, the analysis of the gas cooler’s performance in different ambient temperatures showed that the defined heat exchanger operates properly, compared to other potential gas cooler designs.

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Section: Introductionmentioning

confidence: 99%

Design Evaluation for a Finned-Tube CO2 Gas Cooler in Residential Applications

et al. 2020

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“…The energy demands and operating profile of the main engine are presented in the following Table The calculated net electrical output, gross and net electrical output are in accordance with respective declared values in literature. [34], [53], [66] & [75] Moreover, in order to estimate the performance of the WHR ORC during off design conditions the results of the off design model, developed during the experimental campaign of the WHR ORC prototype, was used [61]. Hence, the performance of the WHR ORC was estimated during monthly and yearly basis.…”

Section: No Further Actions Plannedmentioning

confidence: 99%

Experimental investigation and economic assessment of a fully automated organic Rankine cycle for waste heat recovery from marine engine jacket cooling water

Pallis¹,

Πάλλης²

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Η διδακτορική διατριβή επικεντρώθηκε στην αξιοποίηση της απορριπτόμενης θερμότητας κινητήρων εσωτερικής καύσης και πιο συγκεκριμένα από το κύκλωμα νερού ψύξης του χιτωνίου. Στα πλαίσια της πραγματοποιήθηκε η κατασκευή, η πειραματική αξιολόγηση, διερεύνηση και η πλήρη αυτοματοποίηση ενός συστήματος αξιοποίησης απορριπτόμενης θερμότητας για παραγωγή ηλεκτρικής ενέργειας με τη χρήση οργανικού κύκλου Rankine, ειδικά σχεδιασμένο για το κύκλωμα ψύξης του χιτωνίου ενός ναυτικού πετρελαιοκινητήρα.

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