Experimental investigation of phase change materials used in prototype military shelters

Erkal, Zafer
In this thesis, the possible usage of phase change materials in military shelters with the aim of decreasing the heating effect of the solar radiation is presented. In order to meet the rapidly growing demand for energy in military applications, a passive cooling technique, specifically, storing thermal energy with phase change materials is analyzed by using experimental approach. Not only different types of phase change materials but also different amounts of them are examined during the solar loading experiments. In order to simulate solar heat loading on prototype military shelters, solar radiation test or in other words sunshine test that is stated in military standard MIL‐STD‐810G, Environmental Engineering Considerations and Laboratory Tests, is used. Besides, in order to simulate the real world, solar radiation heat fluxes in Ankara are calculated and solar radiation tests are repeated according to the calculated solar radiation heat fluxes.


Statistical analysis of solar radiation data
Yilmaz, E.; Cancino, B.; Parra, W. R. (Informa UK Limited, 2007-01-01)
Solar radiation is the most important parameter in the design and study of solar energy conversion devices. The present work is based on statistical analysis of solar radiation data for the city of Valparaiso in the coast region of Chile. Experimental data were obtained from the Santa Maria University in Valparaiso over a five-year period measured by the actinograph and the pyranometer. The error between the actinography values in relation to the pyranometer ones was determined. The most frequent error perc...
Application of semi conductor films over glass/ceramic surfaces and their low temperature photocatalytic activity
Ersöz, Tuğçe İrfan; Karakaş, Gürkan; Department of Chemical Engineering (2009)
Semiconductor metal oxides can be induced by light with proper wavelength resulting in oxidation and reduction reactions for the transformation of water and oxygen molecules into active radicals. With this method, it is possible to obtain self-cleaning surfaces and products having antimicrobial properties. The aim of this study is to develop semiconductor metal oxide thin films for multifunctional glass products and the characterization of photocatalytic self cleaning and antimicrobial properties. As semico...
Numerical analysis of an organic Rankine cycle under steady and variable heat input
Bamgbopa, Musbaudeen O.; Uzgoren, Eray (Elsevier BV, 2013-07-01)
This paper develops a strategy to maintain steady operation of an organic Rankine cycle (ORC) by adjusting evaporator flow rates in relation to the available thermal energy. ORC unit under investigation uses R245fa as the working fluid, for which a regression based approach was implemented to evaluate its state properties. Steady and transient models for unit's subcomponents (pump, evaporator, expander and condenser) were developed. Heat source is considered as solar heated water between 80 degrees C and 95...
Development of silica fume-based geopolymer foams
Shakouri, Sahra; Bayer, Özgür; Erdoğan, Sinan Turhan (Elsevier BV, 2020-11-01)
Thermal insulation materials are critical for reducing the energy consumption and carbon emissions associated with buildings. A good insulation material must not only have low density and sufficient mechanical properties but also resist high temperatures and fires. In addition, its production process must be simple and inexpensive. This study describes the production of very low density (>85 kg/m(3)) inorganic foams with high porosity (<94%). Silica fume and NaOH solutions are mixed to prepare a geopolymer ...
Proposal of a Novel Gravity-Fed, Particle-Filled Solar Receiver
JOHNSON, Evan; Baker, Derek Keıth; Tarı, İlker (2016-10-14)
Solar Thermal Electricity power plants utilizing solid particles as heat transfer and storage media have been proposed by several research groups, with studies citing benefits of increased thermal efficiency and lower cost. Several types of solid particle receivers have been proposed, with leading designs consisting of particles falling or suspended in air. A new solid particle receiver is proposed here, consisting of a receiver fully packed with particles flowing downward with gravity. Particle flow rate i...
Citation Formats
Z. Erkal, “Experimental investigation of phase change materials used in prototype military shelters,” M.S. - Master of Science, Middle East Technical University, 2011.