The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Jos?? M. Mu??oz-Escalona - One of the best experts on this subject based on the ideXlab platform.
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A Humid Air Turbine-Organic Rankine Cycle combined cycle for distributed microgeneration
Energy Conversion and Management, 2015Co-Authors: Ricardo Chacartegui, Jos?? A. Becerra, Maria Jesus Blanco, Jos?? M. Mu??oz-EscalonaAbstract:This paper analyses the integration of Humid Air microturbine and an Organic Rankine Cycle in a combined cycle for distributed generation. This integration concept maximizes heat recovery at the exhaust of the micro gas turbine combining the capacities for medium temperature heat recovery of the Organic Rankine Cycle and low temperature heat recovery of the Humid Air Turbine. The integration analysis based on different sets of organic fluids and different recovery temperatures showed that the optimal combination was achieved using toluene and R245fa for medium and low temperature Organic Rankine Cycles respectively. Their combination with the low temperature heat recovery at the Humid Air Turbine saturator maximizes the heat recovery profile from the exhaust gases. The calculations carried out reveal a 25% improvement in net power output of the dual cycle compared to the standalone Humid Air microturbine. Such improvement also affects to global efficiency, increasing it up to 52% in the optimal configuration, above the 41% estimated for the standalone Humid Air Turbine and the 33% rated efficiency of the state of art microturbine Capstone C200. The economic analysis shows that these increases in efficiency and power values make the proposed concept highly competitive, with a 15% reduction in the Levelized Cost of Electricity compared with the standalone Humid Air Turbine and a reduction of 30% compared with the micro gas turbine base case. The presented results show this novel integration as a very promising solution for distributed generation applications at power range under 200 kW, due to its relative simplicity and cost.
Jenny Lindblom - One of the best experts on this subject based on the ideXlab platform.
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Producing water by condensation of Humid Air in buried pipe
2017Co-Authors: Alaaeddin A. Elhammeli, Jenny Lindblom, Mohamed A. Muntasser, Bo NordellAbstract:This study investigates the possibility of using warm Humid Air for irrigation and drinking water production, by flowing Air over the water surface in a solar still with saline or polluted water. V ...
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Underground condensation of Humid Air : a solar driven system for irrigation and drinking-water production
2016Co-Authors: Anna-maria Gustafsson, Jenny LindblomAbstract:The objective was to investigate the feasibility of using warm, Humid Air for subsurface irrigation and drinking water production. By letting Air flow over the water surface in a solar still wi ...
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Underground condensation of Humid Air for drinking water production and subsurface irrigation
Desalination, 2007Co-Authors: Jenny Lindblom, Bo NordellAbstract:Condensation Irrigation (CI) is a combined system for solar desalination and irrigation and/or drinking water production. Solar stills are used for Humidifying ambient Air flowing over the saline water surface in the still. This warm, Humid Air is then led into an underground pipe system where it is cooled and vapour precipitates as freshwater on the pipe walls. If drainage pipes are used the condensed water and some of Humid Air percolate through the pipe perforations and irrigates and aerates the ground. Drinking water can be collected at the pipe endings when using non-perforated pipes. The CI system has attracted attention from several North African countries, and pilot plants are now in operation in Tunisia and Algeria. Mass and heat transfer in the soil around the buried pipes has been modelled to evaluate the theoretical potential for these types of systems and to gain understanding of the mechanisms governing their productivity. For a presumed reference system, the mean water production rate in the drinking water system was 1.8 kg per meter of pipe and day. When using drainage pipes for subsurface irrigation, this number increased to 3.1 kg/m/d, corresponding to 2.3 mm/d of supplied irrigation water. © 2007.
Bo Nordell - One of the best experts on this subject based on the ideXlab platform.
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Producing water by condensation of Humid Air in buried pipe
2017Co-Authors: Alaaeddin A. Elhammeli, Jenny Lindblom, Mohamed A. Muntasser, Bo NordellAbstract:This study investigates the possibility of using warm Humid Air for irrigation and drinking water production, by flowing Air over the water surface in a solar still with saline or polluted water. V ...
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Underground condensation of Humid Air for drinking water production and subsurface irrigation
Desalination, 2007Co-Authors: Jenny Lindblom, Bo NordellAbstract:Condensation Irrigation (CI) is a combined system for solar desalination and irrigation and/or drinking water production. Solar stills are used for Humidifying ambient Air flowing over the saline water surface in the still. This warm, Humid Air is then led into an underground pipe system where it is cooled and vapour precipitates as freshwater on the pipe walls. If drainage pipes are used the condensed water and some of Humid Air percolate through the pipe perforations and irrigates and aerates the ground. Drinking water can be collected at the pipe endings when using non-perforated pipes. The CI system has attracted attention from several North African countries, and pilot plants are now in operation in Tunisia and Algeria. Mass and heat transfer in the soil around the buried pipes has been modelled to evaluate the theoretical potential for these types of systems and to gain understanding of the mechanisms governing their productivity. For a presumed reference system, the mean water production rate in the drinking water system was 1.8 kg per meter of pipe and day. When using drainage pipes for subsurface irrigation, this number increased to 3.1 kg/m/d, corresponding to 2.3 mm/d of supplied irrigation water. © 2007.
Ricardo Chacartegui - One of the best experts on this subject based on the ideXlab platform.
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A Humid Air Turbine–Organic Rankine Cycle combined cycle for distributed microgeneration
Energy Conversion and Management, 2015Co-Authors: Ricardo Chacartegui, Maria Jesus Blanco, Jos?? A. Becerra, José M. Muñoz-escalonaAbstract:Abstract This paper analyses the integration of Humid Air microturbine and an Organic Rankine Cycle in a combined cycle for distributed generation. This integration concept maximizes heat recovery at the exhaust of the micro gas turbine combining the capacities for medium temperature heat recovery of the Organic Rankine Cycle and low temperature heat recovery of the Humid Air Turbine. The integration analysis based on different sets of organic fluids and different recovery temperatures showed that the optimal combination was achieved using toluene and R245fa for medium and low temperature Organic Rankine Cycles respectively. Their combination with the low temperature heat recovery at the Humid Air Turbine saturator maximizes the heat recovery profile from the exhaust gases. The calculations carried out reveal a 25% improvement in net power output of the dual cycle compared to the standalone Humid Air microturbine. Such improvement also affects to global efficiency, increasing it up to 52% in the optimal configuration, above the 41% estimated for the standalone Humid Air Turbine and the 33% rated efficiency of the state of art microturbine Capstone C200. The economic analysis shows that these increases in efficiency and power values make the proposed concept highly competitive, with a 15% reduction in the Levelized Cost of Electricity compared with the standalone Humid Air Turbine and a reduction of 30% compared with the micro gas turbine base case. The presented results show this novel integration as a very promising solution for distributed generation applications at power range under 200 kW, due to its relative simplicity and cost.
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A Humid Air Turbine-Organic Rankine Cycle combined cycle for distributed microgeneration
Energy Conversion and Management, 2015Co-Authors: Ricardo Chacartegui, Jos?? A. Becerra, Maria Jesus Blanco, Jos?? M. Mu??oz-EscalonaAbstract:This paper analyses the integration of Humid Air microturbine and an Organic Rankine Cycle in a combined cycle for distributed generation. This integration concept maximizes heat recovery at the exhaust of the micro gas turbine combining the capacities for medium temperature heat recovery of the Organic Rankine Cycle and low temperature heat recovery of the Humid Air Turbine. The integration analysis based on different sets of organic fluids and different recovery temperatures showed that the optimal combination was achieved using toluene and R245fa for medium and low temperature Organic Rankine Cycles respectively. Their combination with the low temperature heat recovery at the Humid Air Turbine saturator maximizes the heat recovery profile from the exhaust gases. The calculations carried out reveal a 25% improvement in net power output of the dual cycle compared to the standalone Humid Air microturbine. Such improvement also affects to global efficiency, increasing it up to 52% in the optimal configuration, above the 41% estimated for the standalone Humid Air Turbine and the 33% rated efficiency of the state of art microturbine Capstone C200. The economic analysis shows that these increases in efficiency and power values make the proposed concept highly competitive, with a 15% reduction in the Levelized Cost of Electricity compared with the standalone Humid Air Turbine and a reduction of 30% compared with the micro gas turbine base case. The presented results show this novel integration as a very promising solution for distributed generation applications at power range under 200 kW, due to its relative simplicity and cost.
Shilie Weng - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigation of pressurized packing saturator for Humid Air turbine cycle
Applied Thermal Engineering, 2014Co-Authors: Yuzhang Wang, Shilie WengAbstract:Abstract Humid Air turbine (HAT) cycle is an advanced power generation system, and its efficiency and output power are improved by Humidifying the compressed Air. This Humidification process is completed in the saturator. Therefore, the Humidifying performance of saturator has great influence on the performance of HAT cycle. In this work, a new type packing saturator was designed and a series of experiments were carried out to study its Humidifying performance. In order to improve the uniformity of the saturator inlet, a twin-tangential annular flow gas distributor was designed. Then it was authorized by China invention patents (ZL201010200778.9). Now, the mal-distribution factor of inlet Air is mainly between 0.15 and 0.35 in all experimental conditions. Some key parameters of Air and water at the inlet and outlet of saturator were measured at different experimental conditions. These results show the outlet Humid Air temperature is an important parameter for determining the Humidifying amount of the saturator. The Humidifying performance of the saturator is mainly affected by the inlet water temperature and the liquid/gas (L/G) ratio. At the same operating pressure, the Humidity ratio of outlet Humid Air increases with inlet water temperature and L/G ratio. At higher inlet water temperature, the L/G ratio has a greater effect on the Humidity ratio of outlet Humid Air. The outlet water temperature is mainly affected by the inlet gas temperature. With the increasing of inlet Air temperature, the outlet water temperature increases, and it is close to the wet-bulb temperature of inlet Air.
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“Partial pressures” of Humid Air in wide pressure and temperature ranges
Frontiers in energy, 2013Co-Authors: Zidong Wang, Hanping Chen, Shilie WengAbstract:“Partial pressure” in Humid Air is a question very much concerned by scientists and no satisfactory answer has been found to date. This paper proposes a novel method to obtain the “partial pressures” of the water vapor and dry Air in Humid Air. The results obtained by the proposed method are quite different from that obtained by Dalton’s partial pressure law. The fundamental behaviors of water vapor and dry Air are studied in depth in wide pressure and temperature ranges. Semi-permeable membrane models are proposed and applied for both saturated and unsaturated Humid Air. “Improvement factors” are developed to quantitatively describe the magnitude of the interaction between dissimilar molecules. One discovery is that the “partial pressure” of the water vapor in saturated Humid Air equals Ps, rather than (f·Ps) which was formerly believed. The other is that the interaction between dissimilar molecules may be omitted when temperature is above “cutting-off temperature” for unsaturated Humid Air. This paper satisfactorily answers the quest of “partial pressures” in Humid Air from a new perspective.
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New calculation method for thermodynamic properties of Humid Air in Humid Air turbine cycle – The general model and solutions for saturated Humid Air
Energy, 2013Co-Authors: Zidong Wang, Hanping Chen, Shilie WengAbstract:The article proposes a new calculation method for thermodynamic properties (i.e. specific enthalpy, specific entropy and specific volume) of Humid Air in Humid Air turbine cycle. The research pressure range is from 0.1 MPa to 5 MPa. The fundamental behaviors of dry Air and water vapor in saturated Humid Air are explored in depth. The new model proposes and verifies the relationship between total gas mixture pressure and gas component pressures. This provides a good explanation of the fundamental behaviors of gas components in gas mixture from a new perspective. Another discovery is that the water vapor component pressure of saturated Humid Air equals PS, always smaller than its partial pressure (f·PS) which was believed in the past researches. In the new model, “Local Gas Constant” describes the interaction between similar molecules. “Improvement Factor” is proposed for the first time by this article, and it quantitatively describes the magnitude of interaction between dissimilar molecules. They are combined to fully describe the real thermodynamic properties of Humid Air. The average error of Revised Dalton's Method is within 0.1% compared to experimentally-based data.
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Revised Dalton's method for calculation of thermodynamic properties of unsaturated Humid Air and gas mixture after combustion in Humid Air turbine cycle
Energy, 2013Co-Authors: Zidong Wang, Hanping Chen, Shilie WengAbstract:The article applies Revised Dalton's method for calculation of thermodynamic properties (i.e. specific enthalpy, specific entropy and specific volume) of unsaturated Humid Air and gas mixture after combustion in Humid Air turbine cycle. The research temperature range is from 280 K to 1600 K and pressure range from 0.1 MPa to 5 MPa. “Improvement Factor” and “Cutting Off Temperature” for unsaturated Humid Air are explored in depth. Two “Improvement Factor” formulas are proposed. The discovery of the changing trends of “Improvement Factors” reveals the fundamental behaviors of dry Air and water vapor in unsaturated Humid Air. Another discovery is “Cutting Off Temperature”. It is a crucial temperature point, above which the interaction of dissimilar molecules may be omitted. Revised Dalton's method may also be applied to gas mixture after combustion. The thermodynamic properties of unsaturated Humid Air and gas mixture after combustion are calculated by the Revised Dalton's method. The average error of Revised Dalton's method is within 0.1% compared to experimental data.
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Numerical simulation of counter-flow spray saturator for Humid Air turbine cycle
Energy, 2007Co-Authors: Yuzhang Wang, Shilie Weng, Yixing Li, Yonghong WangAbstract:The numerical simulations of simultaneous heat and mass transfer process in the counter-flow spray saturator and Humid Air turbine cycle are carried out in this work, according to the experimental conditions and actual size of a prototype saturator. This Humidifying process involves two-phase flow of Air and water droplets, also including interaction, breakup and collision of water droplets. Eulerian approach is used for gas phase flow, Lagrangian approach is used for liquid phase flow, and the two-way coupling is used between two phases. The simulations agree well with the experimental measurements. The simulations show the flow is with high turbulence intensity, the relative Humidity and temperature of Humid Air increase along with the height of saturator, some water droplets carried by Air escape from the saturator, and the Humid Air is mainly Humidified at the lower part of saturator and is simultaneously Humidified and heated at the upper part.