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Session: Operational experience II
Session starts: Tuesday 08 October, 15:40
Presentation starts: 15:40
Room: Van Beuningen Zaal

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Joost Brasz (Danfoss Turbocor Compressors)

Abstract:
Potential ORC customers are faced with choosing from an increasing number of equipment manufacturers. Comparing the relative merit of various product offerings is difficult since ORC thermal efficiency and the amount of power being generated are heavily dependent on heat source and heat sink temperature and capacity. To allow an easy comparison between various ORC products the performance data provided by manufacturers should be certified by an independent entity, based on identical and well-defined heat source and heat sink conditions and follow qualified testing methods, specifying maximum allowable measurement deviations. Off-design performance of ORC systems is also critical since the daily and seasonal fluctuations in ambient conditions affect heat sink temperature levels causing large variations in ORC output power. The air-conditioning industry faced similar problems in the second half of the last century. Like ORC behavior, air-conditioning performance also strongly depends on outdoor weather conditions as well as indoor cooling demands. To allow a fair comparison of competing product offerings the HVAC equipment manufacturers have formed the American Heating and Refrigeration Institute (AHRI). Through the use of industry standards and voluntary participation in AHRI's certification programs, consumers are assured manufacturers' performance claims are accurate and rated uniformly, enabling meaningful comparisons. AHRI provides access to its standards and guidelines, as well as information about how they are developed and advanced globally. After reviewing some of the performance rating and certification programs that were implemented by AHRI to help the HVAC industry through self-regulation, the paper will focus on potential testing procedures and test conditions to be included in a future standard for ORC equipment qualification. The objective of this presentation is to see whether there is interest within the ORC community for an independent organization with the authority to certify the performance claims by various manufacturers.