Technical analysis of utilization suitability of various wind rotors types for compressors power driving

Conception is from the converting of wind energy, which flows across the wind turbine in mechanic work needed for compressor working. The wind motor one part of energy transform into mechanical work, part of energy is unused and part of energy of stead flow is transformed into eddy after wind rotor.The aim was rendering of technical analysis for equipment, which would use the wind with parameters for chosen area and whole unit would supply power in peak demand. Unit consists of wind turbine, which pushes compressor. Compressor pumps air into the compressed air storage. The air is used for power producing in time of peak demand

Design of vacuum thermal insulation fitting in solar heating applications

The presented paper deals with designs of the vacuum thermal insulation fitting in solar heating applications. Fitting designs, identified by the  authors of this paper, reflects the construction problem of a flat vacuum solar collector caused by the conduction of heat gained with solar  collectors to the collector casing through thermal conductive connection located across the interface between casing and outer piping. As this heat further leaks into the surrounding environment, heat losses of the solar collector is higher and therefore thermal performance of the whole solar system is reduced. The solar collector element in the form of a vacuum  thermal insulation fitting allows a connection of the solar collector with  outer hydraulic circuit of the solar system without creating thermal  bridges while ensuring vacuum tightness of the collector casing. A part in the evaluation process of the proposed design was a vacuum thermal  insulation fitting modelled in CAD environment followed by heat transfer analysis under several operation scenarios (normal operation, extreme  operation, etc.). Subsequently, a functional prototype was manufactured for measurements and verifications of the desired characteristics of  fitting under different operating conditions. All the results of  measurements and simulations demonstrated not only the ability of fitting to ensure vacuum tightness of the solar collector but also the ability of reducing overheating of the collector casing as well

Research and development as contribution of the Renewable Energy Sources Centre to the wind energy utilization in Slovakia

The expected development of renewable energy sources utilization was not reached in last years in Slovakia. This is caused by some barriers. These barriers decrease the easiness of investments into the Renewable energy sources utilization. We recognize specific barriers for each of renewable energy sources and general barriers for all renewable energy sources. Activities of the Renewable Energy Sources Centre help to eliminate both specific and general barriers in Slovakia. The main activities are: a realization of research projects, working out expertises and feasibility studies, information of public about principals and specifics of the wind energy utilization. How the Renewable Energy Sources Centre encourages of the utilization wind energy can be demonstrated on one of the research projects: The designing a stable standpoint with a sufficient storage tank of wind energy, possibly of compressed air. The wind energy serves as a primary resource when it powers the compressor, which fills the pneumatic accumulator (storage tank of compressed air). The compressed air is at a time of peak endurance consumed from pneumatic accumulators for the work of pneumatic engine, which powers the generator and the produced electric energy is being supplied to the public network

Design of vacuum thermal insulation fitting in solar heating applications

The presented paper deals with designs of the vacuum thermal insulation fitting in solar heating applications. Fitting designs, identified by the  authors of this paper, reflects the construction problem of a flat vacuum solar collector caused by the conduction of heat gained with solar  collectors to the collector casing through thermal conductive connection located across the interface between casing and outer piping. As this heat further leaks into the surrounding environment, heat losses of the solar collector is higher and therefore thermal performance of the whole solar system is reduced. The solar collector element in the form of a vacuum  thermal insulation fitting allows a connection of the solar collector with  outer hydraulic circuit of the solar system without creating thermal  bridges while ensuring vacuum tightness of the collector casing. A part in the evaluation process of the proposed design was a vacuum thermal  insulation fitting modelled in CAD environment followed by heat transfer analysis under several operation scenarios (normal operation, extreme  operation, etc.). Subsequently, a functional prototype was manufactured for measurements and verifications of the desired characteristics of  fitting under different operating conditions. All the results of  measurements and simulations demonstrated not only the ability of fitting to ensure vacuum tightness of the solar collector but also the ability of reducing overheating of the collector casing as well

TESES rules as a tool of analysis for chosen OZE projects

Inevitability or in other words the need of energies extraction by other means than the present ones, leads us to furtheralternatives. The article is trying to show the importance of legislative by implementation of new technological solutions in using OZE.The impact of these limitations will be shown on two examples, which are limited by the mentioned legislative politics of SR

A Numerical Analysis of the Thermal Energy Storage Based on Porous Gyroid Structure Filled with Sodium Acetate Trihydrate

The present paper deals with the evaluation of the unique design of the thermal energy storage unit and its impact on the overall heat exchange efficiency. The proposed thermal energy storage unit consists of a gyroid thermally conductive structure, the voids of which are filled with sodium acetate trihydrate. The presented concept is focused on the use in the field of heavy machinery, where it is possible to accumulate and re-use waste heat from internal combustion engines from the cooling liquid or lubricating products. The evaluation of designs took place through numerical simulations on three models characterized by different levels of the introduction of the gyroid structure into the design. From the design point of view, the gyroid structure was considered as an object produced by additive manufacturing methods from a thermally conductive filament based on a thermoplastic polymer, which enables considerable simplification of production compared to the use of suitable anti-corrosion metals. A comparison of the essential thermophysical parameters in the process of charging and discharging of the proposed thermal energy storage unit quantified a significant increase in the rate of the charging, respectively, of the discharging process, manifested by a rapid increase in the temperature of the sodium acetate trihydrate volume, respectively, of the output temperature of the heat transfer medium that removes the accumulated heat for further use

A potention of renewable energy sources in Slovakia in term of production of electricity

Electro-energetics of Slovak Republic is in this time in state of re-structuralization consequent from responsibilities which SR has with integration to the EU and on the other hand with actual status of production capacities of fossil fuels using in heat power stations and heat stations also the utilization of nuclear energy in nuclear power stations Jaslovské Bohunice and Mochovce. Paradoxically slim representation in production capacities have renewable energy sources, while only one relevant one is utilization of water in small hydro power stations. According to fact, that to the year 2010, the share of renewable sources of energy using in comparing with electric energy has to achieve 21,7% (direction of EU 77/2001). It is necessary to evaluate possibilities of utilization and to specify potential of utilization from technical and economical aspect

Detection of Pathological Changes in the Aorta during Thoracic Aortic Aneurysm Progression on Molecular Level

The progression of thoracic aortic aneurysm depends on regulation of aortic wall homeostasis and on changes in the structural components of the extracellular matrix, which are affected by multiple molecular signalling pathways. We decided to correlate the diameter of ascending thoracic aneurysm with gene expression of inflammation markers (IL-6, CRP), cytokine receptors (IL-6R, TNFR1, and TNFR2), and extracellular matrix components (Emilin-1, MMP9, and TIMP) for detection of the degree of pathological process of TAA formation. The experimental group was divided into three groups according to the diameter of the aortic aneurysm. Whole blood and tissue samples were properly collected and used for nucleic acid, chromatin, and protein isolation. The mRNA levels were detected by qRT-PCR. For the detection of protein levels a Cytokine Array IV assay kit was used in combination with a biochip analyzer. In aortic tissue, significant positive correlations were found between increased mRNA levels of inflammatory cytokines (CRP and IL-6) on both mRNA levels in tissue and protein from the blood with maximum in stage 3. Changes of gene expression of selected genes can be used for the experimental study of the inflammatory receptor inhibitors during trials targeted on slowing down the progress of aortic wall aneurysm