Abstract— A series of articles focused on the indoor environment of buildings. Articles discuss the importance of a quality indoor environment and the implementation of the measurement of the parameters of the outgoing air from the indoor environment in the ventilation shaft of a panel house. The content of the second article is the determination of the procedure for measuring the speed, temperature and humidity of the air flowing through the ventilation shaft at the exit from the air duct of the selected panel house.
2. Assessment of Physicochemical Parameters of Soils Contaminated with Petroleum from Eleme Port Harcourt, Nigeria
Abstract— The study was conducted to examine the physicochemical parameters of soils contaminated with petroleum using nonpetroleum contaminated soil as control. Six petroleum contaminated soil samples from Eleme, Port Harcourt and one non petroleum contaminated soil sample from Awka were analyzed for pH, texture, moisture content, bulk density, total organic carbon, total organic nitrogen, total organic matter and total petroleum hydrocarbon. Some pH of the soil samples were acidic while others were alkaline and ranged from 5.26-7.84. The textural class of the petroleum contaminated soils (A-F) were silty clay loam while that of the non petroleum contaminated soil (G) was sandy loam implying that samples A-F are somewhat clayey and sample G almost sandy. Total moisture content of petroleum contaminated soils and their water holding capacity were higher than that of the control and fell in the ranges 0.50-40.56% and 13-29% respectively. Total organic carbon (TOC) and Total organic matter (TOM) of petroleum contaminated soils were higher than that of the non petroleum contaminated soil and were within the ranges 7.29-15.09% and 12.57-26.02% respectively. Total organic nitrogen result follow the same pattern with the non petroleum contaminated soil having the least value. The range was 0.365-0.755%. Bulk density results were within the range of 0.80-1.42g/cm3. The uncontaminated soil (G) had less amount of organic matter in it as a result, the bulk density was the highest (Olaitan and Lombin, 1984). The total petroleum hydrocarbon (TPH) content ranged from 107.5305-626.4060 mg/kg with that of the non petroleum contaminated soil being the least. The results indicated that petroleum contamination affected the physicochemical properties of the soils analyzed. Regular soil assessment is recommended so as to avert any ugly incidence which may occur.
3. Thermal Recovery of Lemna Minor during the Process of Obtaining Hydrogen
Authors: Lukáš Tóth, Romana Dobáková, Ivan Mihálik, Ľubomíra Kmeťová
Abstract— The aim of the article is a theoretical evaluation of the possibilities of using fast-growing aquatic plants, specifically Lemna minor, for the mass production of biomass suitable for the subsequent thermal treatment during the blue hydrogen production process. Much laboratory research has demonstrated the possibility of increasing the volume of biomass under controlled conditions, using water from wastewater treatment plants, or water contaminated with organic residues (faeces) from organic production. Hydroponic cultivation in controlled conditions has shown the possibilities of removing hazardous substances from wastewater, possibly reducing their contamination and at the same time, producing organic biomass with more favourable properties than in the case of dendromass.
4. Design of Passive Internal Heat Transfer Intensifier for Metalhydride Vessels for Mobile Applications
Authors: Filip Duda, Natália Jasminská, Ľubomíra Kmeťová, Šimon Hudák
Abstract— For the development of modern transport systems that meet the demanding goals of reducing greenhouse gas emissions, set in the Paris Agreement from the end of 2015, it is necessary to consider new technologies and new vehicle concepts. In addition to the contractually agreed and accelerating need to contribute to significant emissions reductions, such developments would help to replace fossil fuel energy that most countries around the world are heavily dependent from. Thus, fossil fuels cannot be part of a suitable transport system.
The aim of this work is to design an effective passive cooling system for metal hydride pressure vessel which is used for mobile applications.
5. Design of an Optimized Graphite Electrode Cooling System by using Numerical Simulations
Authors: Ivan Mihálik, Tomáš Brestovič, Marián Lázár, Šimon Hudák
Abstract— The article deals with the design of optimization of graphite electrode cooling in a plasma reactor. By means of experimentally obtained data during the operation of the plasma reactor, it analyzes the current state of electrode cooling. Based on the measured temperatures at the inlet and outlet of the reactor and on the basis of the calculated flow rate of the cooling medium, it proposes a suitable solution for the optimization of the cooling system in the plasma reactor providing the necessary cooling power by analytical calculations with the use of software support. The proposed solution works on the principle of a water-air type heat exchanger. The verification of this proposal is carried out by numerical simulations using the Ansys CFX software.
6. The Process of Heat Exchange in A Piece Batch
Authors: Romana Dobáková, Ľubomíra Kmeťová, Lukáš Tóth
Abstract— The most important phenomenon in technical practice, which affects the thermal regime of industrial aggregates, includes, among others, the heat exchange process, which is primarily characterized by the heat trans-fer coefficient. The article analyses the influence of the grain size of the batch and the flow rate of the gaseous heat-carrying medium on the heat transfer coefficient during heating of the batch to the required temperature as a function of time. The experimental measurement was carried out on shaft furnace models.
7. Methanization of Lemna Minor for the Purpose of obtaining Hydrogen
Abstract— The article discusses the theoretical possibilities of using biomass produced on open water bodies by growing the Lemna minor plant for hydrogen production. The process of obtaining hydrogen is solved primarily in two stages, including the methanization of biomass and the subsequent transformation of methane into hydrogen and carbon dioxide. It deals with current technologies of methane oxidation to form hydrogen using water vapor, such as WGSR, SMR, MPS and PSMR technologies. It indicates various methods of purifying hydrogen from unwanted elements with their subsequent applicability in small local hydrogen production plants in decentralized hydrogen economy.
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Agriculture Journal IJOEAR
International Journal of Environmental and Agriculture Research