The Experts below are selected from a list of 49164 Experts worldwide ranked by ideXlab platform
Jose M. Pinto - One of the best experts on this subject based on the ideXlab platform.
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Integrated analysis of Cooling Water Systems: Modeling and experimental validation
Applied Thermal Engineering, 2009Co-Authors: Giorgia F. Cortinovis, Marcelo T. Ribeiro, José Luís De Paiva, Tah W. Song, Jose M. PintoAbstract:Cooling towers are widely used in many industrial and utility plants as a Cooling medium, whose thermal performance is of vital importance. Despite the wide interest in Cooling tower design, rating and its importance in energy conservation, there are few investigations concerning the integrated analysis of Cooling Systems. This work presents an approach for the Systemic performance analysis of a Cooling Water System. The approach combines experimental design with mathematical modeling. An experimental investigation was carried out to characterize the mass transfer in the packing of the Cooling tower as a function of the liquid and gas flow rates, whose results were within the range of the measurement accuracy. Then, an integrated model was developed that relies on the mass and heat transfer of the Cooling tower, as well as on the hydraulic and thermal interactions with a heat exchanger network. The integrated model for the Cooling Water System was simulated and the temperature results agree with the experimental data of the real operation of the pilot plant. A case study illustrates the interaction in the System and the need for a Systemic analysis of Cooling Water System. The proposed mathematical and experimental analysis should be useful for performance analysis of real-world Cooling Water Systems.
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Integrated analysis of Cooling Water Systems: Modeling and experimental validation
Applied Thermal Engineering, 2009Co-Authors: Giorgia F. Cortinovis, Marcelo T. Ribeiro, José Luís De Paiva, Tah W. Song, Jose M. PintoAbstract:Cooling towers are widely used in many industrial and utility plants as a Cooling medium, whose thermal performance is of vital importance. Despite the wide interest in Cooling tower design, rating and its importance in energy conservation, there are few investigations concerning the integrated analysis of Cooling Systems. This work presents an approach for the Systemic performance analysis of a Cooling Water System. The approach combines experimental design with mathematical modeling. An experimental investigation was carried out to characterize the mass transfer in the packing of the Cooling tower as a function of the liquid and gas flow rates, whose results were within the range of the measurement accuracy. Then, an integrated model was developed that relies on the mass and heat transfer of the Cooling tower, as well as on the hydraulic and thermal interactions with a heat exchanger network. The integrated model for the Cooling Water System was simulated and the temperature results agree with the experimental data of the real operation of the pilot plant. A case study illustrates the interaction in the System and the need for a Systemic analysis of Cooling Water System. The proposed mathematical and experimental analysis should be useful for performance analysis of real-world Cooling Water Systems. (C) 2009 Elsevier Ltd. All rights reserved.FAPESP[00/15097-0
Giorgia F. Cortinovis - One of the best experts on this subject based on the ideXlab platform.
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Integrated analysis of Cooling Water Systems: Modeling and experimental validation
Applied Thermal Engineering, 2009Co-Authors: Giorgia F. Cortinovis, Marcelo T. Ribeiro, José Luís De Paiva, Tah W. Song, Jose M. PintoAbstract:Cooling towers are widely used in many industrial and utility plants as a Cooling medium, whose thermal performance is of vital importance. Despite the wide interest in Cooling tower design, rating and its importance in energy conservation, there are few investigations concerning the integrated analysis of Cooling Systems. This work presents an approach for the Systemic performance analysis of a Cooling Water System. The approach combines experimental design with mathematical modeling. An experimental investigation was carried out to characterize the mass transfer in the packing of the Cooling tower as a function of the liquid and gas flow rates, whose results were within the range of the measurement accuracy. Then, an integrated model was developed that relies on the mass and heat transfer of the Cooling tower, as well as on the hydraulic and thermal interactions with a heat exchanger network. The integrated model for the Cooling Water System was simulated and the temperature results agree with the experimental data of the real operation of the pilot plant. A case study illustrates the interaction in the System and the need for a Systemic analysis of Cooling Water System. The proposed mathematical and experimental analysis should be useful for performance analysis of real-world Cooling Water Systems.
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Integrated analysis of Cooling Water Systems: Modeling and experimental validation
Applied Thermal Engineering, 2009Co-Authors: Giorgia F. Cortinovis, Marcelo T. Ribeiro, José Luís De Paiva, Tah W. Song, Jose M. PintoAbstract:Cooling towers are widely used in many industrial and utility plants as a Cooling medium, whose thermal performance is of vital importance. Despite the wide interest in Cooling tower design, rating and its importance in energy conservation, there are few investigations concerning the integrated analysis of Cooling Systems. This work presents an approach for the Systemic performance analysis of a Cooling Water System. The approach combines experimental design with mathematical modeling. An experimental investigation was carried out to characterize the mass transfer in the packing of the Cooling tower as a function of the liquid and gas flow rates, whose results were within the range of the measurement accuracy. Then, an integrated model was developed that relies on the mass and heat transfer of the Cooling tower, as well as on the hydraulic and thermal interactions with a heat exchanger network. The integrated model for the Cooling Water System was simulated and the temperature results agree with the experimental data of the real operation of the pilot plant. A case study illustrates the interaction in the System and the need for a Systemic analysis of Cooling Water System. The proposed mathematical and experimental analysis should be useful for performance analysis of real-world Cooling Water Systems. (C) 2009 Elsevier Ltd. All rights reserved.FAPESP[00/15097-0
Xiao Feng - One of the best experts on this subject based on the ideXlab platform.
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Sustainable design of Cooling Water System
Towards Sustainable Chemical Processes, 2020Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract A Cooling Water System requires a large amount of energy and Water to fulfill the Cooling duty of industry. It contains two subSystems, namely a cooler network and a pump network. In a conventional Cooling Water System design, a cooler network is in pure parallel structure, and all the pumps are designed with the same supply pressure head. This kind of conventional design will result in larger Water flow rate and higher pressure drop, leading to higher Water and energy consumption. In addition, the interaction between the two subSystems has not been considered in previous research. In this chapter, a parallel-series structure is applied in cooler network to reduce Water flow rate, and a main-auxiliary pump network, multiloop structure is applied in pump network to reduce energy consumption. The intrinsic relationship between the cooler network and pumping System is investigated. The model is formulated as a mixed-integer nonlinear programming (MINLP) problem. The objective is to determine the Cooling Water System by minimizing the total annual cost. Finally, air coolers are involved in the study to find optimal heat duty distribution between Water Cooling and air Cooling in different conditions.
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optimization of circulating Cooling Water networks considering the constraint of return Water temperature
Journal of Cleaner Production, 2018Co-Authors: Chen Li, Yufei Wang, Xiao FengAbstract:Abstract Circulating Cooling Water System is widely used in industry. Traditionally, circulating Cooling Water System is in a parallel structure. Without reuse of Cooling Water, the return temperature of Water is low and total flow rate of Water is high. This leads to the low efficiency of Cooling tower and high energy consumption of System. When the coolers are in series arrangement and Water is reused, the return temperature of Cooling Water will increase. High return temperature of Cooling Water can lead to the severe fouling of coolers. The level of fouling depends on outlet temperature and velocity of Water. In this paper, we proposed model where Cooling Water is reused and the fouling of cooler is avoided. The numerical relationship between stream velocity and return temperature is introduced. The objective is to formulate the framework with minimum flow rate and no fouling with coolers. A case study is used to show the effectiveness of the proposed model.
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optimization of Cooling Water System with compression refrigeration cycle
2018Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract Cooling Water System and chilled Water System are wildly used in industry to reject waste heat. When Cooling Water is not capable to cool down the hot stream to target temperature, chilled Water is required. So far, Cooling Water System and chilled Water System are designed separately because the two Systems use Water with different qualities. Desalted Water is used in chilled Water System but it cannot be used in Cooling Water System, because Water losing is huge in open Cooling tower. Meanwhile, fresh Water cannot be used in chilled Water System because of high concentration of impurities. In this work, closed Cooling tower is applied, because there is no lose of recirculating Water in closed Cooling tower, desalted Water can be used in Cooling Water System. A large amount of Water was saved by using closed Cooling tower. Cooling Water System and chilled Water System was integrated into one, Cooling duty was redistributed between the two Systems. Stage-wise heat exchanger network was employed where Water can be reused. For returned hot Water, they are firstly sent to closed Cooling tower to be cooled down to a certain temperature, and then part of the Water is further cooled down by refrigeration cycle. The model is formulated as mixed-integer nonlinear programming (MINLP) problem. The objective is to minimize the cost of integrated Cooling and chilled Water System, and determine the optimal heat load distribution between closed Cooling tower and refrigeration cycle. Results show that optimization model yields significant reduction on total annual cost and energy consumption, in comparison with System where Cooling Water System and refrigeration cycle are separated.
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Synthesis Cooling Water System with air coolers
Chemical Engineering Research and Design, 2018Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract Adding air coolers to Cooling Water System is an effective way to reduce heat load and the cost of Cooling Water System. It is also an effective method to prevent fouling and save Water in the region where Water is scarce. There is a trade-off between air cooler System and Cooling Water System. When heat load of air cooler is high, Cooling tower consumes less fresh Water, but the cost of air cooler can be high. Conventionally, the two Systems are optimized separately. This paper presents an optimization model for synthesizing Cooling Water System with air coolers. The Water coolers, air coolers, pumping scheme and Cooling tower are simultaneously optimized. Each hot stream can be cooled down by air cooler to certain degree and then cooled down by Water cooler to target temperature. Or it can be cooled down by the air cooler or Water cooler exclusively. The model is formulated as mixed-integer nonlinear programming (MINLP) problem. The objective is to formulate the Cooling Water System with the minimizing total annual cost. The case is optimized under two cities with different prices of Water and electricity. Results show that optimization model yields 29.4% and 13.1% TAC reduction. Results also indicate that it is particularly necessary to add air coolers to Cooling Water System in region where Water is scarce and electricity price is low.
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Optimization of multi-plants Cooling Water System
Energy, 2018Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract Conventionally, Cooling Water System is optimized within a single plant. In reality, a set of Cooling towers supply Water for multiple plants. This paper presents an optimization model for multi-plants Cooling Water System. Instead of using a set of uniform pumps to transport Cooling Water, this work proposed a novel multi-loops pump network and an updated main-auxiliary pump network to reduce pumping energy. Distance factors and pipeline layouts are considered owing to the long distance between plants and pump station. Connecting patterns of different pump networks are investigated and corresponding piping costs are treated as optimized variables. Cooler and pump networks, Cooling tower and pipeline layouts are optimized simultaneously. The model is formulated as a mixed-integer nonlinear programming (MINLP) problem. The objective is to obtain the Cooling Water System with minimized total annual cost. Two case studies are used to illustrate the effectiveness of the proposed structure.
Andrew Ruminski - One of the best experts on this subject based on the ideXlab platform.
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Failure Analysis of a Low-Temperature Carbon Steel Pipe from a Nuclear Power Station Cooling Water System
Journal of Failure Analysis and Prevention, 2015Co-Authors: Andrew RuminskiAbstract:This paper presents the results of a failure examination on an ASTM A106 carbon steel pipe from component Cooling Water System at a nuclear power station. The pipe was associated with a large motor air cooler. Through-wall cracking occurred after over three decades of total service and approximately one decade following a refurbishment. The pipe was filled with demineralized Water and operated at a temperature
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failure analysis of a low temperature carbon steel pipe from a nuclear power station Cooling Water System
Journal of Failure Analysis and Prevention, 2015Co-Authors: Andrew RuminskiAbstract:This paper presents the results of a failure examination on an ASTM A106 carbon steel pipe from component Cooling Water System at a nuclear power station. The pipe was associated with a large motor air cooler. Through-wall cracking occurred after over three decades of total service and approximately one decade following a refurbishment. The pipe was filled with demineralized Water and operated at a temperature <40 °C. Sections of the failed pipe along with a similar non-leaking section were examined with light optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, mass spectrometry, a gas analyzing furnace, and a microhardness indenter to provide data about the failure mechanism and the base material. The results of the study showed that the failure was the result of outside diameter initiated, intergranular stress corrosion cracking. The failure occurred in the vicinity of a weld in the heat-affected zone (HAZ) of the pipe. Other areas of non-through-wall cracking were also observed in the pipes outside of the HAZ.
Yufei Wang - One of the best experts on this subject based on the ideXlab platform.
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Sustainable design of Cooling Water System
Towards Sustainable Chemical Processes, 2020Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract A Cooling Water System requires a large amount of energy and Water to fulfill the Cooling duty of industry. It contains two subSystems, namely a cooler network and a pump network. In a conventional Cooling Water System design, a cooler network is in pure parallel structure, and all the pumps are designed with the same supply pressure head. This kind of conventional design will result in larger Water flow rate and higher pressure drop, leading to higher Water and energy consumption. In addition, the interaction between the two subSystems has not been considered in previous research. In this chapter, a parallel-series structure is applied in cooler network to reduce Water flow rate, and a main-auxiliary pump network, multiloop structure is applied in pump network to reduce energy consumption. The intrinsic relationship between the cooler network and pumping System is investigated. The model is formulated as a mixed-integer nonlinear programming (MINLP) problem. The objective is to determine the Cooling Water System by minimizing the total annual cost. Finally, air coolers are involved in the study to find optimal heat duty distribution between Water Cooling and air Cooling in different conditions.
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optimization of circulating Cooling Water networks considering the constraint of return Water temperature
Journal of Cleaner Production, 2018Co-Authors: Chen Li, Yufei Wang, Xiao FengAbstract:Abstract Circulating Cooling Water System is widely used in industry. Traditionally, circulating Cooling Water System is in a parallel structure. Without reuse of Cooling Water, the return temperature of Water is low and total flow rate of Water is high. This leads to the low efficiency of Cooling tower and high energy consumption of System. When the coolers are in series arrangement and Water is reused, the return temperature of Cooling Water will increase. High return temperature of Cooling Water can lead to the severe fouling of coolers. The level of fouling depends on outlet temperature and velocity of Water. In this paper, we proposed model where Cooling Water is reused and the fouling of cooler is avoided. The numerical relationship between stream velocity and return temperature is introduced. The objective is to formulate the framework with minimum flow rate and no fouling with coolers. A case study is used to show the effectiveness of the proposed model.
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optimization of Cooling Water System with compression refrigeration cycle
2018Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract Cooling Water System and chilled Water System are wildly used in industry to reject waste heat. When Cooling Water is not capable to cool down the hot stream to target temperature, chilled Water is required. So far, Cooling Water System and chilled Water System are designed separately because the two Systems use Water with different qualities. Desalted Water is used in chilled Water System but it cannot be used in Cooling Water System, because Water losing is huge in open Cooling tower. Meanwhile, fresh Water cannot be used in chilled Water System because of high concentration of impurities. In this work, closed Cooling tower is applied, because there is no lose of recirculating Water in closed Cooling tower, desalted Water can be used in Cooling Water System. A large amount of Water was saved by using closed Cooling tower. Cooling Water System and chilled Water System was integrated into one, Cooling duty was redistributed between the two Systems. Stage-wise heat exchanger network was employed where Water can be reused. For returned hot Water, they are firstly sent to closed Cooling tower to be cooled down to a certain temperature, and then part of the Water is further cooled down by refrigeration cycle. The model is formulated as mixed-integer nonlinear programming (MINLP) problem. The objective is to minimize the cost of integrated Cooling and chilled Water System, and determine the optimal heat load distribution between closed Cooling tower and refrigeration cycle. Results show that optimization model yields significant reduction on total annual cost and energy consumption, in comparison with System where Cooling Water System and refrigeration cycle are separated.
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Synthesis Cooling Water System with air coolers
Chemical Engineering Research and Design, 2018Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract Adding air coolers to Cooling Water System is an effective way to reduce heat load and the cost of Cooling Water System. It is also an effective method to prevent fouling and save Water in the region where Water is scarce. There is a trade-off between air cooler System and Cooling Water System. When heat load of air cooler is high, Cooling tower consumes less fresh Water, but the cost of air cooler can be high. Conventionally, the two Systems are optimized separately. This paper presents an optimization model for synthesizing Cooling Water System with air coolers. The Water coolers, air coolers, pumping scheme and Cooling tower are simultaneously optimized. Each hot stream can be cooled down by air cooler to certain degree and then cooled down by Water cooler to target temperature. Or it can be cooled down by the air cooler or Water cooler exclusively. The model is formulated as mixed-integer nonlinear programming (MINLP) problem. The objective is to formulate the Cooling Water System with the minimizing total annual cost. The case is optimized under two cities with different prices of Water and electricity. Results show that optimization model yields 29.4% and 13.1% TAC reduction. Results also indicate that it is particularly necessary to add air coolers to Cooling Water System in region where Water is scarce and electricity price is low.
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Optimization of multi-plants Cooling Water System
Energy, 2018Co-Authors: Yufei Wang, Xiao FengAbstract:Abstract Conventionally, Cooling Water System is optimized within a single plant. In reality, a set of Cooling towers supply Water for multiple plants. This paper presents an optimization model for multi-plants Cooling Water System. Instead of using a set of uniform pumps to transport Cooling Water, this work proposed a novel multi-loops pump network and an updated main-auxiliary pump network to reduce pumping energy. Distance factors and pipeline layouts are considered owing to the long distance between plants and pump station. Connecting patterns of different pump networks are investigated and corresponding piping costs are treated as optimized variables. Cooler and pump networks, Cooling tower and pipeline layouts are optimized simultaneously. The model is formulated as a mixed-integer nonlinear programming (MINLP) problem. The objective is to obtain the Cooling Water System with minimized total annual cost. Two case studies are used to illustrate the effectiveness of the proposed structure.