Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for subject:(cascaded system analysis). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Anna University

1. Chinnapandian M. Experimental investigation and thermodynamic analysis of a cascaded latent heat storage system for diesel engine waste heat recovery;.

Degree: 2013, Anna University

There exists today worldwide concern about the best ways of using the depletable sources of energy, and of developing techniques to reduce pollution. This interest has encouraged research and development efforts in the fields of alternative energy sources, cost effective use of the exhaustible sources of energy, and the reuse of the usually wasted forms of energy. In the present work, the cascading arrangement of the phase change storage system is studied to analysis the improvement in the efficiency of the storage system during the charging and discharging processes. A charging experiment is conducted by integrating a two stage cascading thermal storage system with an internal combustion engine. The thermal performance of heat recovery heat exchanger and the storage system has been studied for the charging process of the phase change material in the thermal storage tank for various engine operating conditions. The work also deals with the use of exergy as an efficient tool to measure the quantity and quality of energy extracted from a diesel engine exhaust and stored in a phase change material based thermal storage system. This analysis provides a more realistic and meaningful assessment than the conventional energy analysis. Using actual system data, the assessment of energy and exergy saved, and the energy and exergy efficiencies are evaluated and reported. A comparison of performance has also been made through energy and exergy flow diagrams. The discharge process is analyzed with a case study and it is concluded that it is possible to improve both the energy and exergy efficiency appreciably, using the cascaded latent heat storage system, when the energy from the exhaust gas is to be stored at a high temperature. It is concluded that the cascaded arrangement with multiple phase change materials improves both the energy and exergy efficiency and the exergy analysis combined with environment and economic perspectives is the useful solution methodology for many of the energy and environment problems

Appendices 1 to 5; pp.96-114

Advisors/Committee Members: Velraj, R..

Subjects/Keywords: Thermodynamic analysis; cascaded latent; heat storage system; diesel engine; exergy

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

M, C. (2013). Experimental investigation and thermodynamic analysis of a cascaded latent heat storage system for diesel engine waste heat recovery;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/11420

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

M, Chinnapandian. “Experimental investigation and thermodynamic analysis of a cascaded latent heat storage system for diesel engine waste heat recovery;.” 2013. Thesis, Anna University. Accessed October 19, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/11420.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

M, Chinnapandian. “Experimental investigation and thermodynamic analysis of a cascaded latent heat storage system for diesel engine waste heat recovery;.” 2013. Web. 19 Oct 2020.

Vancouver:

M C. Experimental investigation and thermodynamic analysis of a cascaded latent heat storage system for diesel engine waste heat recovery;. [Internet] [Thesis]. Anna University; 2013. [cited 2020 Oct 19]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11420.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

M C. Experimental investigation and thermodynamic analysis of a cascaded latent heat storage system for diesel engine waste heat recovery;. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/11420

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Nano, Tomi F. An apodized-aperture x-ray detector design for improved image quality in mammography.

Degree: 2019, University of Western Ontario

X-ray imaging for early cancer detection, such as screening mammography, requires images with high signal-to-noise ratio (SNR) using low levels of radiation exposure. Conventional detectors consist of a matrix of sensor elements, producing images where each pixel corresponds to a single sensor element. This imposes a fundamental limitation on image contrast and SNR for imaging fine detail for a given exposure. The work presented here reconsiders x-ray image formation using a new x-ray detector design that synthesizes image pixels from a large number of very small sensor elements with the goal of optimizing contrast and SNR. Our new detector design, called apodized-aperture pixel (AAP), makes use of recent technology developments to produce images from an “over-sampled” sensor signal while suppressing both signal and noise aliasing to improve the modulation transfer function (MTF) and detective quantum efficiency (DQE). Signal and noise performance of the AAP approach is described theoretically using a cascaded-systems analysis. This approach preserves the MTF of the small sensor elements up to the image sampling cut-off frequency where the MTF is increased by up to 53%. Frequencies above the cut-off are suppressed, eliminating both signal and noise aliasing artifacts and corresponding to a high-frequency DQE increase by 2.5x. X-ray interactions in a scintillator introduce signal and noise correlations, including x-ray reabsorption and converter blur, resulting in reduced aliasing and decreased improvement in DQE. Best results with the AAP design were obtained using a high-resolution converter, such as selenium (Se), with little impact from reabsorption. Implementation on a Se/CMOS micro-sensor prototype with 7.8μm element size with image pixel size approximately 50μm showed a flat DQE curve (ideal) up to 10cycles/mm. AAP images of resolution test patterns, mammography phantoms, and specimen imaging of micro-calcifications from biopsies showed the expected improvements in SNR and visibility of fine-detail. It is concluded that synthesizing image pixels from small physical sensor elements can increase MTF and DQE, and eliminate aliasing artifacts, for a desired image pixel size. The resulting increase in SNR may benefit all forms of radiography, and in particular mammography, where accurate visualization of fine detail is important for early cancer detection.

Subjects/Keywords: Apodized aperture pixel (AAP); x-ray detector design; detective quantum efficiency (DQE); noise aliasing; signal to noise ratio; cascaded system analysis; Medical Biophysics

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nano, T. F. (2019). An apodized-aperture x-ray detector design for improved image quality in mammography. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/6233

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Nano, Tomi F. “An apodized-aperture x-ray detector design for improved image quality in mammography.” 2019. Thesis, University of Western Ontario. Accessed October 19, 2020. https://ir.lib.uwo.ca/etd/6233.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Nano, Tomi F. “An apodized-aperture x-ray detector design for improved image quality in mammography.” 2019. Web. 19 Oct 2020.

Vancouver:

Nano TF. An apodized-aperture x-ray detector design for improved image quality in mammography. [Internet] [Thesis]. University of Western Ontario; 2019. [cited 2020 Oct 19]. Available from: https://ir.lib.uwo.ca/etd/6233.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nano TF. An apodized-aperture x-ray detector design for improved image quality in mammography. [Thesis]. University of Western Ontario; 2019. Available from: https://ir.lib.uwo.ca/etd/6233

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.