Change search
ReferencesLink to record
Permanent link

Direct link
Performance and size assessment of ORCs in mobile military power generation
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this study the suitability of small-scale organic Rankine cycles in military power generation is evaluated. It is presupposed that external combustion engines have favorable characteristics in terms of noise, heat and vibration signals.The work is conducted through a process consisting of three blocks; working fluid selection, component selection and modeling. The research community states that the optimal fluid is a matter of application. Therefore, a screening of working fluids is performed on the basis of a few key properties. A simplistic cycle model is used to determine the operating conditions that yield the best thermodynamic performance. Consequently, these conditions are the starting point of the component selection process. Each component that is selected introduces restrictions to the cycle. The upper pressure is, for example, limited by the material of the boiler. Therefore, an iterative selection methodology is employed in order to consider both cycle performance and component limitations. In the last block the model is refined with realistic properties of the selected components. Size and performance of the system are evaluated for electric outputs between 0.1 and 3.0 kW. The model is realized in Excel VBA and constructed for high user flexibility.It is found that the thermal efficiency is proportional to the size of the system. A water-methanol mixture passes the screening process and provides the best cycle performance. Also, scroll expanders are recommended as the prime mover of the system. With the proposed components, the realizable power range is between 1.8 and 3.0 kW. The most critical components, in terms of size, are the expander and condenser. Finally, this study indicates that the system can be built in sizes competitive to existing solutions.

Place, publisher, year, edition, pages
2015. , 75 p.
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-170579OAI: diva2:838957
Educational program
Master of Science in Engineering - Mechanical Engineering
Available from: 2015-08-28 Created: 2015-07-01 Last updated: 2015-08-28Bibliographically approved

Open Access in DiVA

fulltext(2223 kB)112 downloads
File information
File name FULLTEXT01.pdfFile size 2223 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Heat and Power Technology
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 112 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 135 hits
ReferencesLink to record
Permanent link

Direct link