The Experts below are selected from a list of 6594 Experts worldwide ranked by ideXlab platform
K. Sumathy - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic analysis and optimization of a solar Thermal Water pump
Applied Thermal Engineering, 2001Co-Authors: Y.w. Wong, K. SumathyAbstract:Thermodynamic analysis has been carried out in detail, to predict the performance of a solar Thermal Water pump working at different discharge heads. It is shown that the heating time of the working fluid and the condensation time of the spent vapour play an important role in determining the number of cycles that a pump can perform in a day. The heating time in turn depends on the amount of working fluid being loaded in the system initially. Similarly, it is observed that an optimal cooling coil area dictates the effective condensation time. Hence, in the present work, an optimum design has been outlined for a solar Thermal Water pump, both in terms of the amount of the working fluid to be loaded in the system and the optimum cooling coil area.
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Solar Thermal Water pumping systems: a review
Renewable & Sustainable Energy Reviews, 1999Co-Authors: Y.w. Wong, K. SumathyAbstract:A number of attempts have been made by scientists to utilize solar energy for irrigation Water pumping. It is mainly a problem of conversion of heat energy available from the sun, to mechanical energy. Some ingenious methods have been devised to utilize the available energy at low temperatures. This paper reviews past efforts to develop solar Thermal Water pumping systems which employ either conventional pumps or unconventional pumps, and emphasizes how the system modifications were made to suit different pumping conditions and requirements.
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Thermodynamic analysis of a solar Thermal Water pump
Solar Energy, 1996Co-Authors: K. Sumathy, A. Venkatesh, V. SriramuluAbstract:Abstract The principle of the workings of a solar Thermal Water pump with n-pentane as the working fluid is described briefly. The performance of the pump is predicted from the thermodynamic analysis of the cycle of events. Experiments were carried out with a small solar Thermal pump having a collector area of 1 m 2 . The experimental and theoretical results were compared. The experimental results were different from those obtained theoretically for ideal conditions. But, during the course of experimentation a number of constraints were noticed. When the theoretical analysis was appropriately modified to account for these limitations, the resulting agreement was found to be good which validates the model proposed.
Rolandas Uscila - One of the best experts on this subject based on the ideXlab platform.
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Treatment of diesel-contaminated soil using Thermal Water vapor arc plasma
Environmental Science and Pollution Research, 2020Co-Authors: Dovilė Gimžauskaitė, Andrius Tamošiūnas, Mindaugas Aikas, Simona Tučkutė, V. Snapkauskienė, Rolandas UscilaAbstract:Soil pollution with petroleum-based fuels is a serious issue causing environmental problems. Recently, the use of plasma technologies for soil remediation has shown an interest and great potential. The remediation process can be performed in a fast timeframe without adding supplementary chemical reagents or without additional pre-treatment of the polluted soil. As a result, the use of plasma enables to obtain highly effective degradation of pollutants. Thus, in the present experimental research, diesel fuel removal from contaminated soil by utilizing Thermal Water vapor arc plasma was investigated. It was found that increased concentration of diesel fuel in the soil raised carbon and hydrogen concentrations in the soil. Moreover, soil surface morphology was modified by causing the formation of bigger agglomerates. It was also determined that after the plasma treatment process, soil grains became akin in size and structure to clean soil grains. A complete desorption of carbon, which came from diesel fuel to the soil, and a slight decomposition of organic carbon present in the soil were observed during the soil remediation process. Thermogravimetric analysis showed that regardless of the diesel fuel concentration in the soil, four stages of mass loss were observed: moisture loss, vaporization, and combustion of diesel fuel as well as reduction of volatiles and char in the soil. Producer gas analysis indicated that during soil remediation diesel fuel was mainly converted to synthesis gas, i.e., a mixture of H_2, CO, and CO_2. Moreover, the decomposition of diesel fuel and the formation of synthesis gas depended on the amount of pollutant in the soil. According to the obtained results, Thermal Water vapor arc plasma was able to completely remove diesel fuel from polluted soil in the form of synthesis gas with no significant influence on soil’s properties.
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The Use of Thermal Water Vapor Arc Plasma as an Oily Soil Remediation Technique
Proceedings, 2018Co-Authors: Dovilė Gimžauskaitė, Mindaugas Aikas, Andrius Tamošiūnas, Simona Tučkutė, V. Snapkauskienė, Rolandas UscilaAbstract:Contaminated soil remediation with plasma is a new and little explored method. Thus, the aim of this study was to investigate Thermal Water vapor arc plasma suitability to remediate soil polluted by petroleum hydrocarbons (diesel). Also, the impact of different initial pollutant concentrations was investigated. Scanning electron microscopy (SEM) data showed that soil surface morphology depends on diesel fuel concentration in the soil. Results obtained with energy dispersive X-ray spectroscopy (EDS) indicated that carbon content in soil decreased after the treatment process and became similar to the carbon content in the clean soil. Furthermore, the measurements taken with gas analyzer revealed the Thermal Water vapor arc plasma suitability to remediate contaminated soil as well as generate by-product—synthesis gas (H2 + CO). It was observed that the amount of generated synthesis gas depends on the soil moisture content.
Dovilė Gimžauskaitė - One of the best experts on this subject based on the ideXlab platform.
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Treatment of diesel-contaminated soil using Thermal Water vapor arc plasma
Environmental Science and Pollution Research, 2020Co-Authors: Dovilė Gimžauskaitė, Andrius Tamošiūnas, Mindaugas Aikas, Simona Tučkutė, V. Snapkauskienė, Rolandas UscilaAbstract:Soil pollution with petroleum-based fuels is a serious issue causing environmental problems. Recently, the use of plasma technologies for soil remediation has shown an interest and great potential. The remediation process can be performed in a fast timeframe without adding supplementary chemical reagents or without additional pre-treatment of the polluted soil. As a result, the use of plasma enables to obtain highly effective degradation of pollutants. Thus, in the present experimental research, diesel fuel removal from contaminated soil by utilizing Thermal Water vapor arc plasma was investigated. It was found that increased concentration of diesel fuel in the soil raised carbon and hydrogen concentrations in the soil. Moreover, soil surface morphology was modified by causing the formation of bigger agglomerates. It was also determined that after the plasma treatment process, soil grains became akin in size and structure to clean soil grains. A complete desorption of carbon, which came from diesel fuel to the soil, and a slight decomposition of organic carbon present in the soil were observed during the soil remediation process. Thermogravimetric analysis showed that regardless of the diesel fuel concentration in the soil, four stages of mass loss were observed: moisture loss, vaporization, and combustion of diesel fuel as well as reduction of volatiles and char in the soil. Producer gas analysis indicated that during soil remediation diesel fuel was mainly converted to synthesis gas, i.e., a mixture of H_2, CO, and CO_2. Moreover, the decomposition of diesel fuel and the formation of synthesis gas depended on the amount of pollutant in the soil. According to the obtained results, Thermal Water vapor arc plasma was able to completely remove diesel fuel from polluted soil in the form of synthesis gas with no significant influence on soil’s properties.
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The Use of Thermal Water Vapor Arc Plasma as an Oily Soil Remediation Technique
Proceedings, 2018Co-Authors: Dovilė Gimžauskaitė, Mindaugas Aikas, Andrius Tamošiūnas, Simona Tučkutė, V. Snapkauskienė, Rolandas UscilaAbstract:Contaminated soil remediation with plasma is a new and little explored method. Thus, the aim of this study was to investigate Thermal Water vapor arc plasma suitability to remediate soil polluted by petroleum hydrocarbons (diesel). Also, the impact of different initial pollutant concentrations was investigated. Scanning electron microscopy (SEM) data showed that soil surface morphology depends on diesel fuel concentration in the soil. Results obtained with energy dispersive X-ray spectroscopy (EDS) indicated that carbon content in soil decreased after the treatment process and became similar to the carbon content in the clean soil. Furthermore, the measurements taken with gas analyzer revealed the Thermal Water vapor arc plasma suitability to remediate contaminated soil as well as generate by-product—synthesis gas (H2 + CO). It was observed that the amount of generated synthesis gas depends on the soil moisture content.
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Energy recovery from waste glycerol by utilizing Thermal Water vapor plasma
Environmental Science and Pollution Research, 2017Co-Authors: Andrius Tamošiūnas, Pranas Valatkevičius, Dovilė Gimžauskaitė, Vladas Mėčius, Mejdi Jeguirim, Mindaugas AikasAbstract:Glycerol, considered as a waste feedstock resulting from biodiesel production, has received much attention in recent years due to its properties, which offer to recover energy. The aim of this study was to investigate the use of a Thermal Water vapor plasma for waste (crude) glycerol conversion to synthesis gas, or syngas (H_2 + CO). In parallel of crude glycerol, a pure glycerol (99.5%) was used as a reference material in order to compare the concentrations of the formed product gas. A direct current (DC) arc plasma torch stabilized by a mixture of argon/Water vapor was utilized for the effective glycerol conversion to hydrogen-rich synthesis gas. It was found that after waste glycerol treatment, the main reaction products were gases with corresponding concentrations of H_2 50.7%, CO 23.53%, CO_2 11.45%, and CH_4 3.82%, and traces of C_2H_2 and C_2H_6, which concentrations were below 0.5%. The comparable concentrations of the formed gas products were obtained after pure glycerol conversion—H_2 46.4%, CO 26.25%, CO_2 11.3%, and CH_4 4.7%. The use of Thermal Water vapor plasma producing synthesis gas is an effective method to recover energy from both crude and pure glycerol. The performance of the glycerol conversion system was defined in terms of the produced gas yield, the carbon conversion efficiency, the cold gas efficiency, and the specific energy requirements.
Mindaugas Aikas - One of the best experts on this subject based on the ideXlab platform.
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Treatment of diesel-contaminated soil using Thermal Water vapor arc plasma
Environmental Science and Pollution Research, 2020Co-Authors: Dovilė Gimžauskaitė, Andrius Tamošiūnas, Mindaugas Aikas, Simona Tučkutė, V. Snapkauskienė, Rolandas UscilaAbstract:Soil pollution with petroleum-based fuels is a serious issue causing environmental problems. Recently, the use of plasma technologies for soil remediation has shown an interest and great potential. The remediation process can be performed in a fast timeframe without adding supplementary chemical reagents or without additional pre-treatment of the polluted soil. As a result, the use of plasma enables to obtain highly effective degradation of pollutants. Thus, in the present experimental research, diesel fuel removal from contaminated soil by utilizing Thermal Water vapor arc plasma was investigated. It was found that increased concentration of diesel fuel in the soil raised carbon and hydrogen concentrations in the soil. Moreover, soil surface morphology was modified by causing the formation of bigger agglomerates. It was also determined that after the plasma treatment process, soil grains became akin in size and structure to clean soil grains. A complete desorption of carbon, which came from diesel fuel to the soil, and a slight decomposition of organic carbon present in the soil were observed during the soil remediation process. Thermogravimetric analysis showed that regardless of the diesel fuel concentration in the soil, four stages of mass loss were observed: moisture loss, vaporization, and combustion of diesel fuel as well as reduction of volatiles and char in the soil. Producer gas analysis indicated that during soil remediation diesel fuel was mainly converted to synthesis gas, i.e., a mixture of H_2, CO, and CO_2. Moreover, the decomposition of diesel fuel and the formation of synthesis gas depended on the amount of pollutant in the soil. According to the obtained results, Thermal Water vapor arc plasma was able to completely remove diesel fuel from polluted soil in the form of synthesis gas with no significant influence on soil’s properties.
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The Use of Thermal Water Vapor Arc Plasma as an Oily Soil Remediation Technique
Proceedings, 2018Co-Authors: Dovilė Gimžauskaitė, Mindaugas Aikas, Andrius Tamošiūnas, Simona Tučkutė, V. Snapkauskienė, Rolandas UscilaAbstract:Contaminated soil remediation with plasma is a new and little explored method. Thus, the aim of this study was to investigate Thermal Water vapor arc plasma suitability to remediate soil polluted by petroleum hydrocarbons (diesel). Also, the impact of different initial pollutant concentrations was investigated. Scanning electron microscopy (SEM) data showed that soil surface morphology depends on diesel fuel concentration in the soil. Results obtained with energy dispersive X-ray spectroscopy (EDS) indicated that carbon content in soil decreased after the treatment process and became similar to the carbon content in the clean soil. Furthermore, the measurements taken with gas analyzer revealed the Thermal Water vapor arc plasma suitability to remediate contaminated soil as well as generate by-product—synthesis gas (H2 + CO). It was observed that the amount of generated synthesis gas depends on the soil moisture content.
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Energy recovery from waste glycerol by utilizing Thermal Water vapor plasma
Environmental Science and Pollution Research, 2017Co-Authors: Andrius Tamošiūnas, Pranas Valatkevičius, Dovilė Gimžauskaitė, Vladas Mėčius, Mejdi Jeguirim, Mindaugas AikasAbstract:Glycerol, considered as a waste feedstock resulting from biodiesel production, has received much attention in recent years due to its properties, which offer to recover energy. The aim of this study was to investigate the use of a Thermal Water vapor plasma for waste (crude) glycerol conversion to synthesis gas, or syngas (H_2 + CO). In parallel of crude glycerol, a pure glycerol (99.5%) was used as a reference material in order to compare the concentrations of the formed product gas. A direct current (DC) arc plasma torch stabilized by a mixture of argon/Water vapor was utilized for the effective glycerol conversion to hydrogen-rich synthesis gas. It was found that after waste glycerol treatment, the main reaction products were gases with corresponding concentrations of H_2 50.7%, CO 23.53%, CO_2 11.45%, and CH_4 3.82%, and traces of C_2H_2 and C_2H_6, which concentrations were below 0.5%. The comparable concentrations of the formed gas products were obtained after pure glycerol conversion—H_2 46.4%, CO 26.25%, CO_2 11.3%, and CH_4 4.7%. The use of Thermal Water vapor plasma producing synthesis gas is an effective method to recover energy from both crude and pure glycerol. The performance of the glycerol conversion system was defined in terms of the produced gas yield, the carbon conversion efficiency, the cold gas efficiency, and the specific energy requirements.
Y.w. Wong - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic analysis and optimization of a solar Thermal Water pump
Applied Thermal Engineering, 2001Co-Authors: Y.w. Wong, K. SumathyAbstract:Thermodynamic analysis has been carried out in detail, to predict the performance of a solar Thermal Water pump working at different discharge heads. It is shown that the heating time of the working fluid and the condensation time of the spent vapour play an important role in determining the number of cycles that a pump can perform in a day. The heating time in turn depends on the amount of working fluid being loaded in the system initially. Similarly, it is observed that an optimal cooling coil area dictates the effective condensation time. Hence, in the present work, an optimum design has been outlined for a solar Thermal Water pump, both in terms of the amount of the working fluid to be loaded in the system and the optimum cooling coil area.
-
Solar Thermal Water pumping systems: a review
Renewable & Sustainable Energy Reviews, 1999Co-Authors: Y.w. Wong, K. SumathyAbstract:A number of attempts have been made by scientists to utilize solar energy for irrigation Water pumping. It is mainly a problem of conversion of heat energy available from the sun, to mechanical energy. Some ingenious methods have been devised to utilize the available energy at low temperatures. This paper reviews past efforts to develop solar Thermal Water pumping systems which employ either conventional pumps or unconventional pumps, and emphasizes how the system modifications were made to suit different pumping conditions and requirements.
