On high level evaluation and comparison of ORC power generators
2015 (English)In: Proceedings of the 3rd International Seminar on ORC Power Systems, 2015Conference paper (Refereed)
A review of the thermodynamic performance of ORCs from public, as well as non-public sources hasrevealed a correlation suitable to be used as a rule of thumb for high-level performance estimation ofORC power generators. Using the correlation, the limited amount of available test data can begeneralised leading to a high level evaluation of the commercial benefits of any potential applicationfor ORCs.Power generators using ORC-technology exist in relatively low numbers. Furthermore, fieldinstallations seldom imply comparable boundary conditions. As ORCs generally operate at lowtemperature differences between source and sink it has been shown that their relative sensitivity tovariations in temperatures i.e. the finiteness of source- and sink, is larger than the sensitivity of powergenerators operating with large temperature differences. Therefore the establishing of practical rule ofthumb performance estimation, similar to the figure of merit, Coefficient of Performance, COP, asused in refrigeration and air conditioning industry, has previously not been successful.In order to arrange field data in a manner suitable for comparison a refinement of suitable figures ofmerit was required. The suggested, refined terms are presented and explained as well as criticallyevaluated against the most common efficiency terms traditionally used.The current lack of a performance rule of thumb leaves room for less serious vendors and laymen tomake performance claims unrealistic to practical achievements. Scrutinizing such questionablestatements requires detail process simulations and a multitude of technical assumptions. Henceargumentation becomes ineffective. If a suitable rule of thumb can be established argumentationagainst dubious claims would become significantly more forceful.This paper suggests a new term to be used as rule of thumb and explains a method on how to use it.
Place, publisher, year, edition, pages
Research subject Energy Technology
IdentifiersURN: urn:nbn:se:kth:diva-188016DOI: 10.13140/2.1.4611.9123ISBN: 978-2-9600059-2-9OAI: oai:DiVA.org:kth-188016DiVA: diva2:933112
3rd International Seminar on ORC Power Systems, October 12-14, 2015, Brussels, Belgium
QC 201606072016-06-032016-06-032016-06-09Bibliographically approved