Theoretical and experimental investigation on characteristics of adsorption cooling systems using advanced porous materials

Download

index.pdf

Date

2014

Author

Bonyadi, Nima

Metadata

Show full item record

Item Usage Stats

100
views

74
downloads

The solid sorption cooling systems are getting more popular around the globe due to their benign behavior and possibility to work with renewable energy. Despite many advantages, the overall efficiency of adsorption cooling systems is still low in comparison to vapor compression chillers. Researchers declare that heat and mass transfer and adsorption capacity inside the adsorbent bed have dominant role on the performance of the cooling unit. One way to increase both adsorption capacity and heat distribution inside the bed is by improving the characteristics of the adsorbents. Enhancing the adsorption characteristics of adsorbent materials can be achieved by developing new composites and mixtures. Using impregnation method and metal piece additives increase the adsorption capacity and thermal conductivity of the adsorbent. This thesis is an integration of three related works. In the first place, the influence of thermal conductivity on adsorption and desorption processes were investigated numerically. Next, the silica gel adsorbent was modified using metal mixture and impregnation methods. In the last step, the thermo physical and adsorption properties of new materials like adsorption capacity, thermal conductivity, heat capacity and pore size were determined in a set of experimental studies. The numerical results show that thermal conductivity affects the equilibrium adsorption behavior and using materials with higher thermal conductivities yield to lower cycle time. Higher thermal conductivity values have been obtained for new materials in comparison to silica gel. Also, pore size and diameter of the impregnated materials have been increased. On the other hand, water adsorption capacity of impregnated materials increased significantly. However, addition of metal additives decreased the adsorption rate slightly which is mainly due to the lower mass of adsorbent and higher mass transfer resistances.

Subject Keywords

Solar energy., Adsorption., Cooling., Porous materials.

URI

http://etd.lib.metu.edu.tr/upload/12617894/index.pdf
https://hdl.handle.net/11511/23970

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Modeling and financial analysis of a solar-biomass hybrid power plant in Turkey Özdemir, Merve; Yozgatlıgil, Ahmet; Department of Mechanical Engineering (2017) Solar thermal and biomass combustion systems can be hybridized via a Rankine cycle to have a continuous electricity generation and lower CO2 footprint. Disadvantages of these two renewable technologies can be overcome by hybridization. In this work; we develop a simulation model for Rankine cycle based, solar-biomass hybrid power plants using the ASPEN PLUS software. Solar parabolic collectors and biomass combustion are arranged in parallel to produce steam for power generation. Using the simulation model; ...
Conceptual design and heat transfer investigation of a dense granular flow solar receiver Johnson, Evan Fair; Baker, Derek Keıth; Tarı, İlker; Department of Mechanical Engineering (2017) Solid particles have previously been proposed as an alternative to molten salt as a heat transfer and heat storage medium for concentrating solar power plants. While previous solid particle solar receiver designs use fluidized or falling particles, the new type of receiver proposed in this thesis uses a gravity-driven flow of particles in a dense granular flow regime. Through experimentation with sand, the flow and heat transfer properties were studied in two geometries: vertical tubular and vertical parall...
Investigating the performances of photovoltaic modules/systems for Central Anatolia using a thermal modeling approach Tunçel, Bilge; Akınoğlu, Bülent Gültekin; Department of Physics (2019) Effective use and performance enhancement of the renewable energy systems are becoming increasingly important as climate change is widely recognized as one of the most crucial problems for the Earth. Turkey, a country within the solar belt, has an abundance of solar energy potential. Economical, environmental and physical investigations are needed to ensure effective utilization of this potential. In this thesis, using the meteorological parameters of the Central Anatolia and parameters of photovoltaic (PV)...
Sizing of a Photovoltaic-Wind-Oil Shale Hybrid System: Case Analysis in Jordan AL-Ghussain, Loiy; Taylan, Onur; Fahrioglu, Murat (2018-02-01) The integration between renewable energy systems (RESs) and oil shale system ensures reliable power generation source with a competitive energy generation cost when compared to costs of conventional systems. In addition, this integration will prevent considerable amount of CO2 emissions. This study aims to determine the size of a grid-tied hybrid system in Al-Tafilah, Jordan that maximizes the yearly overall fraction of demand met with levelized cost of electricity (LCOE) equal to or lower than the local co...
Design and realization of a new concentrating photovoltaic solar energy module based on lossless horizontally staggered light guide Selimoğlu, Özgür; Turan, Raşit; Department of Physics (2013) Concentrating Photovoltaic systems are good candidates for low cost and clean electricity generation from solar energy. CPV means replacing much of the expensive semiconductor photovoltaic cells with the cheaper optics. Although the idea is simple, CPV systems have several problems inherent to their system design, such as module thickness, expensive PV cells and overheating. Light guide systems are good alternatives to classical CPV systems that can clear off most of the problems of those systems. In this t...

Citation Formats

N. Bonyadi, “Theoretical and experimental investigation on characteristics of adsorption cooling systems using advanced porous materials,” M.S. - Master of Science, Middle East Technical University, 2014.