Exergy analysis of single and multistep thermal processes
2011 (English)Conference paper (Refereed)
The present paper introduces the concepts of exergy and treats it applications to analysis of the gain in exergy efficiency between one step and multi-step thermal processes. The analysis, which is carried out with the Excel based SEPE program, is exemplified with the comparison between single step and two-steps heat pump setup for providing heat to a heat floor system and a domestic hot water. The paper discusses the use of the concept of exergy efficiency as a measure of success for design of a heat pump application and how the use of information on exergy destruction and temperature levels in different parts of the system add a new perspective to the analysis and the evaluation of the system performance. The paper shows how this information can be used to improve the system configuration and also the operation of the system for given boundary conditions. This is especially useful when the energy from the low temperature sources is can be utilized at different temperature or quality levels such as for space heating and domestic hot water.
Place, publisher, year, edition, pages
2011. 1-8 p.
thermal processes, exergy
IdentifiersURN: urn:nbn:se:kth:diva-53132OAI: oai:DiVA.org:kth-53132DiVA: diva2:468998
2nd International Exergy, Life Cycle Assessment, and Sustainability Workshop & Symposium (ELCAS2) 19 - 21 June, 2011, NISYROS - GREECE