Show simple item record

dc.contributor.authorDeshpande, Jaydeep Sanjeeven_US
dc.date.accessioned2016-06-20T17:52:24Z
dc.date.available2016-06-20T17:52:24Z
dc.date.issued2016-06-20en_US
dc.identifier.othervt_gsexam:8181en_US
dc.identifier.urihttp://hdl.handle.net/10919/71370
dc.description.abstractDesalination is one of the proposed methods to meet the ever increasing water demands. It can be subdivided into two broad categories, thermal based desalination and electricity based desalination. Multi-effect Distillation (MED), Multi-Stage Flashing (MSF), Membrane Distillation (MD) fall under former and Reverse Osmosis (RO), Electro-Dialysis (ED) fall under later. MD offers an attractive solution for seawater as well as brackish water distillation. It shows highly pure yields, theoretically 100% pure. The overall construction of a MD unit is way simpler than any other desalination systems. MD is a thermally driven diffusion process where desalination takes places in the form of water vapor transport across the membrane. It has low second law efficiency due to parasitic heat losses. The objective of the first part of the investigation is to thoroughly analyze a Direct Contact Membrane Distillation (DCMD) system from the view point of yield and exergy. The insights from exergy analysis are used in a design study, which is used for performance optimization. The first part concludes with a design procedure and design windows for large scale DCMD construction. In the second part of the investigation, focus is moved to waveguide solar energy collector. The idea behind an ideal waveguide is to reduce the complexity of modeling solar energy collection. The mathematical model provided in this analysis can be extended to a family of non-imaging optics in solar energy and serves as a benchmarking analysis tool. A waveguide is suitable for low temperature operations due to limitations on maximum continuous temperature of operation. Thus, it becomes an ideal solution for DCMD applications. A levelized cost analysis is presented for a waveguide powered DCMD plant of a 30,000 capacity. A combination of waveguide and DCMD shows levelized cost of water at $1.80/m3, which is found to be lower than previously reported solar desalination water costs.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectseawater desalinationen_US
dc.subjectmembrane distillationen_US
dc.subjectdirect contact membrane distillationen_US
dc.subjectexergy analysisen_US
dc.subjectrecovery ratioen_US
dc.subjectoptimizationen_US
dc.subjectlevelized costen_US
dc.subjectwaveguideen_US
dc.subjectsolar desalinationen_US
dc.titleInvestigations on Solar Powered Direct Contact Membrane Distillationen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.committeechairPitchumani, Rangaen_US
dc.contributor.committeememberHuxtable, Scott T.en_US
dc.contributor.committeememberMahajan, Roop L.en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record