Powered by Blogger.


Tanzania NGO JOBS Kenya Agriculture Health - Medical Jobs Consultancy FINANCE JOBS MOZAMBIQUE South Africa United Nations - Les Nations Unies Ethiopia Rwanda Administration Zambia Ghana Zimbabwe Malawi Engineering Jobs Angola Education Jobs NIGERIA Uganda Namibia South Sudan Tunisia Botswana Monitoring and Evaluation Sudan Liberia Senegal Sierra Leone EGYPT Lesotho MEDIA - PUBLICATIONS Swaziland Human Resources MADAGASCAR Somalia Algeria Libya Mali ACCOUNTANT Mauritania Project Management Scholarships for Africans Burundi AfDB - African Development Bank Djibouti FREIGHT - AVIATION JOBS Guinea Logistics - Transport Burkina Faso Maroc - Morocco Peace and Security Republic of Congo TOGO Benin Cote d'Ivoire Law - Legal Jobs Research Jobs WHO World Health Organization Cameroun Gambia Seychelles Niger Central African Republic Sales Jobs Volunteers AU African Union ECOWAS Environmental Jobs Equatorial Guinea Eritrea ICT JOBS International Organization for Migration Procurement Jobs Internships USAID Climate Change FAO Food and Agriculture Organization Gabon Mauritius - Maurice TCHAD - CHAD Congo FOOD AND NUTRITION JOBS MINING JOBS Save the Children Cape Verde EAC East African Community TELECOMMUNICATION JOBS Teaching Jobs Comoros Information Technology Software Engineering WFP World Food Programme BANKING JOBS SADC Southern African Development Community United States Embassy World Vision ILO International Labour Organization NEPAD Réunion Sahrawi Arab Republic SaoTome and Principe UNECA Economic Commission for Africa University Jobs Western Sahara

Tuesday, November 1, 2016

PhD Student Position Water Harvesting from Air (4.4)

by Juma Mzuri  |  at  9:45 AM

MotivationThe earth’s atmosphere contains about 4% of the earth’s total fresh water. Harvesting humidity is therefore an interesting technology to supply to the ever increasing demand for fresh water. The technology is most promising for arid locations without connection to the centralized power grid.   Cooling humid air makes the vapor condensate, which then can be collected. However, energy-wise there is a better option. Prior to cooling, the relatively small amount of water vapor is separated from the high background of other components in the air, particularly nitrogen. This way only the water vapor needs to be cooled down, saving more than half of the energy. PDMS or SPEEK-coated membranes are impermeable for water in the liquid state but show a high selectivity for water vapor over nitrogen gas. The driving force for water vapor permeation across the membrane is the difference in partial water vapor pressure between the feed and permeate side. At the permeate side the vapor pressure can be reduced by (a combination of) low total pressure (‘vacuum’), a condenser and a (dry) sweeping gas. Coupling the system to either a wind turbine or solar energy generator creates a stand-alone device.                                
Research challengeA previous PhD student on this topic investigated the feasibility of this technology by performing simulations. In this way the effect of several parameters has been studied theoretically but these results still await the translation of this knowledge into a functional prototype. The aim of this current project is to explore different configurations, for example, in respect to membrane and condenser (e.g., direct contact, air gap or sweep gas) and design a working prototype. In addition, the membrane itself can be part of the focus (e.g., inside-out spiral, outside-in spiral or planar). Even the investigation of entirely new membrane material belongs to the options. 
RequirementsThe ideal candidate has an MSc degree and is a creative (mechanical) engineer with solid knowledge of thermodynamics and mass transport phenomena. Knowledge on membrane technology is an advantage. 
Our offerDoing a PhD in the Netherlands takes 4 year.
You earn a salary to make a living.
In year 1 the salary is €30.674, in year 4 €39.214 before tax.
The amount of paid holiday days is 35/year. 
PartnershipThe research project is part of the Wetsus research theme Dehydration
The following companies are part of this research theme: Avebe, Feyecon, (Dutch Rainmaker)
Promotor: Not yet decided
For more information contact dr. Henk Miedema of Wetsus (henk.miedema@wetsus.nl) or dr. ir. Antoine Kemperman of University Twente (a.j.b.kemperman@utwente.nl). 
LocationWetsus, Leeuwarden, The Netherlands

Blog Archive

Proudly Powered by Blogger.