The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
R Best - One of the best experts on this subject based on the ideXlab platform.
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comparison of the theoretical performance of a Solar Air Conditioning system operating with water lithium bromide and an aqueous ternary hydroxide
Solar Energy Materials and Solar Cells, 2000Co-Authors: R. J. Romero, W Rivera, R BestAbstract:Abstract This paper compares the theoretical performance of the modelling of a Solar absorption Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide mixture consisting of sodium, potassium and cesium hydroxides in the proportions 40 : 36 : 24 (NaOH : KOH : CsOH). In this paper, plots of the coefficients of performance of a Solar Air Conditioning system operating with these two mixtures are presented. The results showed that similar coefficients of performance are obtained for both mixtures, however, it was found that the system operating with the hydroxides may operate with a higher range of condenser and absorber temperatures and the heat delivered by these components can be removed by Air.
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Comparison of the theoretical performance of a Solar Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide
Solar Energy Materials and Solar Cells, 2000Co-Authors: Rosenberg J. Romero, W Rivera, R BestAbstract:Abstract This paper compares the theoretical performance of the modelling of a Solar absorption Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide mixture consisting of sodium, potassium and cesium hydroxides in the proportions 40 : 36 : 24 (NaOH : KOH : CsOH). In this paper, plots of the coefficients of performance of a Solar Air Conditioning system operating with these two mixtures are presented. The results showed that similar coefficients of performance are obtained for both mixtures, however, it was found that the system operating with the hydroxides may operate with a higher range of condenser and absorber temperatures and the heat delivered by these components can be removed by Air.
Rosenberg J. Romero - One of the best experts on this subject based on the ideXlab platform.
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Working fluid concentration measurement in Solar Air Conditioning systems
Solar Energy, 2006Co-Authors: Rosenberg J. Romero, M. A. Basurto-pensado, A.h. Jiménez-heredia, J. J. Sánchez-mondragónAbstract:In order to evaluate on-line corrosive electrolyte concentration in Solar Air Conditioning systems, an optical technique to determine the concentration is being proposed. With this optical sensing method, it is possible to measure the percentage concentration of the aqueous corrosive lithium bromide solution at temperatures ranging from 25 °C to 70 °C and a maximum concentration of 60%. The measurement system is based on the refractive index of the solution and the data correlation, at several temperature and concentration values. The results of this work present a direct method for concentration measurement of corrosive liquids and also show the correlation among the three parameters: refractive index, temperature and weight concentration. This correlation can be used to develop the optical device for Solar Air Conditioning systems to control and improve efficiency.
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Comparison of the theoretical performance of a Solar Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide
Solar Energy Materials and Solar Cells, 2000Co-Authors: Rosenberg J. Romero, W Rivera, R BestAbstract:Abstract This paper compares the theoretical performance of the modelling of a Solar absorption Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide mixture consisting of sodium, potassium and cesium hydroxides in the proportions 40 : 36 : 24 (NaOH : KOH : CsOH). In this paper, plots of the coefficients of performance of a Solar Air Conditioning system operating with these two mixtures are presented. The results showed that similar coefficients of performance are obtained for both mixtures, however, it was found that the system operating with the hydroxides may operate with a higher range of condenser and absorber temperatures and the heat delivered by these components can be removed by Air.
W Rivera - One of the best experts on this subject based on the ideXlab platform.
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comparison of the theoretical performance of a Solar Air Conditioning system operating with water lithium bromide and an aqueous ternary hydroxide
Solar Energy Materials and Solar Cells, 2000Co-Authors: R. J. Romero, W Rivera, R BestAbstract:Abstract This paper compares the theoretical performance of the modelling of a Solar absorption Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide mixture consisting of sodium, potassium and cesium hydroxides in the proportions 40 : 36 : 24 (NaOH : KOH : CsOH). In this paper, plots of the coefficients of performance of a Solar Air Conditioning system operating with these two mixtures are presented. The results showed that similar coefficients of performance are obtained for both mixtures, however, it was found that the system operating with the hydroxides may operate with a higher range of condenser and absorber temperatures and the heat delivered by these components can be removed by Air.
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Comparison of the theoretical performance of a Solar Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide
Solar Energy Materials and Solar Cells, 2000Co-Authors: Rosenberg J. Romero, W Rivera, R BestAbstract:Abstract This paper compares the theoretical performance of the modelling of a Solar absorption Air Conditioning system operating with water/lithium bromide and an aqueous ternary hydroxide mixture consisting of sodium, potassium and cesium hydroxides in the proportions 40 : 36 : 24 (NaOH : KOH : CsOH). In this paper, plots of the coefficients of performance of a Solar Air Conditioning system operating with these two mixtures are presented. The results showed that similar coefficients of performance are obtained for both mixtures, however, it was found that the system operating with the hydroxides may operate with a higher range of condenser and absorber temperatures and the heat delivered by these components can be removed by Air.
E F Camacho - One of the best experts on this subject based on the ideXlab platform.
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Application of a Transition Graph-Based Predictive Algorithm to a Solar Air Conditioning Plant
IEEE Transactions on Control Systems Technology, 2010Co-Authors: Darine Zambrano, Winston Garcia-gabin, E F CamachoAbstract:This brief presents the development of a transition graph-based predictive algorithm and its application to a Solar Air Conditioning plant. The process considered is a hybrid system of variable configuration subject to disturbances in its main energy source, namely Solar radiation. The predictive algorithm switches between the operating modes of the plant on the basis of minimizing the performance cost function associated to each operating mode and the switching cost function associated to the transition between operating modes. The cost functions depend on the predicted states of the plant. A transition graph is used to reduce the computational cost of the optimization problem; the graph is plotted using the concept of reachability. The main objective of the predictive algorithm is to find the optimal solution to the configuration problem and the optimal control signal of the plant throughout the day. Experimental results show that Solar energy was used during most of the test and cooling demand was satisfied.
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a smith predictive based mpc in a Solar Air Conditioning plant
Journal of Process Control, 2005Co-Authors: Amparo Nunezreyes, Julio E Normeyrico, Carlos Bordons, E F CamachoAbstract:Abstract This paper presents the application of a Model Predictive Controller to the temperature control in a Solar Air Conditioning plant. The controller uses a Smith Predictor and includes a feed-forward control action to reject disturbances caused by Solar radiation and the auxiliary gas heater. The tuning procedure is simple and allows a good compromise between robustness and performance. The behaviour of the controller is illustrated by experimental results.
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HSCC - A heuristic predictive logic controller applied to hybrid Solar Air Conditioning plant
Hybrid Systems: Computation and Control, 1Co-Authors: Darine Zambrano, Winston Garcia-gabin, E F CamachoAbstract:This paper shows the development of a heuristic predictive logic controller (HPLoC) applied to a Solar Air Conditioning plant. The plant uses two energy sources, Solar and gas, in order to warm up the water. The hot water feeds a single-effect absorption chiller. A hybrid controller using Model based Predictive Control (MPC) and heuristic logic conditions have been implemented in the real plant, the controller allows configuring the plant with the minimizing of the gas consumption.
Sebastian Engell - One of the best experts on this subject based on the ideXlab platform.
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Supervisory Control of a Solar Air Conditioning Plant with Hybrid Dynamics
European Journal of Control, 2008Co-Authors: Christian Sonntag, Hao Ding, Sebastian EngellAbstract:The control of Solar plants is challenging for several reasons, one of which is that the Solar irradiation that represents the main energy source cannot be manipulated and is subject to large fluctuations due to changes of the weather conditions. For the Solar Air Conditioning plant considered in this work, which is located at the University of Seville, Spain, additional difficulties arise from the presence of discretely switched valves and pumps and autonomous switches of the continuous dynamics which make it a hybrid system. The main control goal for this process is to minimize the consumption of auxiliary energy while ensuring a safe and robust operation even in the face of large disturbances. The available hybrid models of the plant that are suitable for algorithmic controller synthesis or model-predictive control do not represent the process dynamics accurately enough to ensure a robust plant operation under all conditions. In this paper, a supervisory control scheme is presented that was designed based on a thorough investigation of the energetic aspects of the Solar plant and on several identification experiments at the real plant. The application of the control scheme to the real Solar plant and to the simulation model illustrates the robustness and the efficiency of the approach.
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Hybrid supervisory control of a Solar Air Conditioning plant
2007 European Control Conference (ECC), 2007Co-Authors: Hao Ding, Christian Sonntag, Sebastian Engell, Olaf StursbergAbstract:The control of Solar plants is challenging for several reasons, one of which is that the Solar irradiation representing the main energy source cannot be manipulated and is subject to large disturbances due to changes of the weather conditions. For the Solar Air Conditioning plant considered in this work, additional difficulties arise from the presence of discretely switched valves and pumps and autonomous switchings of the continuous dynamics which make it a hybrid system. The main control goal for this process is to minimize the consumption of auxiliary energy while ensuring a safe and robust operation even in the face of large disturbances. Since the existing hybrid models of the plant do not represent the process dynamics accurately, this paper presents a robust supervisory control scheme that was designed based on a thorough investigation of the energetic aspects of the Solar plant. The application of the control scheme to a real Solar plant illustrates the robustness and efficiency of the approach.
