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P.n. Paraskevopoulos - One of the best experts on this subject based on the ideXlab platform.

  • Modeling and Control of a Neutral Time Delay Test Case Central Heating System
    2020
    Co-Authors: Nikolaos D. Kouvakas, Fotis N. Koumboulis, P.n. Paraskevopoulos
    Abstract:

    In the present paper, the mathematical model of a test case Central Heating System is developed in the form of a nonlinear neutral time delay model which in turn is simplified to a neutral time delay model with constant time delay. In the process it is shown that the influence of the delay is significant, thus its incorporation to the model is of high importance. A PI controller is derived to control the temperature of a room which is modeled as a first order differential equation.

  • On the Morgan's problem for neutral time delay Systems via dynamic controllers with application to a test case Central Heating System
    2009 IEEE Control Applications (CCA) & Intelligent Control (ISIC), 2009
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas, P.n. Paraskevopoulos
    Abstract:

    The Morgan's problem is investigated, using a realizable controller with dynamic measurement output feedback and dynamic precompensator for the general class of linear neutral multi delay Systems. It is proven that the necessary and sufficient condition for the solvability of the problem via a realizable controller is independent of the realizability requirement and it is the right invertibillity of the open loop transfer matrix. A class of controllers solving the problem is explicitly determined. The proposed technique is applied to a test case Central Heating System to achieve thermal autonomy. Based on the dynamic model of the Heating System the performance of the proposed control scheme is successfully illustrated through computational experiments.

  • CCA/ISIC - On the Morgan's problem for neutral time delay Systems via dynamic controllers with application to a test case Central Heating System
    2009 IEEE International Conference on Control Applications, 2009
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas, P.n. Paraskevopoulos
    Abstract:

    The Morgan's problem is investigated, using a realizable controller with dynamic measurement output feedback and dynamic precompensator for the general class of linear neutral multi delay Systems. It is proven that the necessary and sufficient condition for the solvability of the problem via a realizable controller is independent of the realizability requirement and it is the right invertibillity of the open loop transfer matrix. A class of controllers solving the problem is explicitly determined. The proposed technique is applied to a test case Central Heating System to achieve thermal autonomy. Based on the dynamic model of the Heating System the performance of the proposed control scheme is successfully illustrated through computational experiments.

  • Dynamic disturbance rejection controllers for neutral time delay Systems with application to a Central Heating System
    Science in China Series F: Information Sciences, 2009
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas, P.n. Paraskevopoulos
    Abstract:

    In the present paper the problem of disturbance rejection of single input-single output neutral time delay Systems with multiple measurable disturbances is solved via dynamic controllers. In particular, the general form of the controller matrices is presented, while the necessary and sufficient conditions for the controller to be realizable are offered. The proposed technique is applied to a test case neutral time delay Central Heating System. In particular, the nonlinear model of the plant and its linearized approximation are presented. Based on the linearized model, a two-stage controller is designed in order to regulate the room temperature and the boiler effluent temperature. The performance of the closed loop System is investigated through computational experiments.

  • analytic modeling and metaheuristic pid control of a neutral time delay test case Central Heating System
    2008
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas, P.n. Paraskevopoulos
    Abstract:

    In the present paper, the analytic mathematical model of a test case Central Heating System is developed in the form of a nonlinear neutral time delay model with time varying delay which in turn is simplified to a neutral time delay model with constant time delay. In the process it is shown that the influence of the delay is significant, thus its incorporation to the model is of high importance while the constant delay approximation imposes only small error. A PID controller is derived to control the temperature of a room, which is modeled as a first order differential equation. The controller parameters are evaluated using a metaheuristic algorithm.

Xin Wang - One of the best experts on this subject based on the ideXlab platform.

  • inverse problem and variation method to optimize cascade heat exchange network in Central Heating System
    Journal of Thermal Science, 2017
    Co-Authors: Yin Zhang, Yinping Zhang, Xin Wang
    Abstract:

    Urban Heating in northern China accounts for 40% of total building energy usage. In Central Heating Systems, heat is often transferred from heat source to users by the heat network where several heat exchangers are installed at heat source, substations and terminals respectively. For given overall Heating capacity and heat source temperature, increasing the terminal fluid temperature is an effective way to improve the thermal performance of such cascade heat exchange network for energy saving. In this paper, the mathematical optimization model of the cascade heat exchange network with three-stage heat exchangers in series is established. Aim at maximizing the cold fluid temperature for given hot fluid temperature and overall Heating capacity, the optimal heat exchange area distribution and the medium fluids’ flow rates are determined through inverse problem and variation method. The preliminary results show that the heat exchange areas should be distributed equally for each heat exchanger. It also indicates that in order to improve the thermal performance of the whole System, more heat exchange areas should be allocated to the heat exchanger where flow rate difference between two fluids is relatively small. This work is important for guiding the optimization design of practical cascade Heating Systems.

  • application of concept of heat adaptor determining an ideal Central Heating System using industrial waste heat
    Applied Thermal Engineering, 2017
    Co-Authors: Yin Zhang, Yinping Zhang, Xin Wang
    Abstract:

    Abstract In northern China, urban Heating energy consumption accounts for about 40% of the total building energy consumption and emits a lot of pollutants to atmosphere environment, while tremendous low grade industrial waste heat is discharged into the environment. Utilizing these industrial waste heat for Central Heating in winter is of great importance in energy saving and atmosphere environment protection. Hence, it raised more concerns during recent years. However, in traditional Systems, such waste heat is used to produce relatively low temperature supply water through heat exchangers. It leads to large mass flow rate in the primary network, which results in huge pumping energy consumption after long distance delivery, since the Heating users are often far away from the industrial waste heat sources. In this paper, applying the concept of heat adaptor put forward in our previous paper, an ideal Central Heating System using such industrial waste heat is determined. It is composed of two heat adaptors at heat source and substations respectively. The optimal return water temperature in the primary network of the ideal Central Heating System is derived to be the ambient air temperature. Compared with a conventional Central Heating System including heat exchanger System or absorption heat exchanger System, the return water temperature, mass flow rate and delivery pumping energy consumption of an ideal Central Heating System can be decreased greatly. In the illustrative example, the delivery pumping energy consumption is reduced by 82%, by using the proposed ideal Central Heating System. It is hoped that the method developed in the present paper is helpful for optimization design of practical Central Heating Systems using industrial waste heat.

  • application of heat adaptor thermodynamic optimization for Central Heating System through extremum principle
    Energy Procedia, 2015
    Co-Authors: Yin Zhang, Yinping Zhang, Xin Wang
    Abstract:

    Abstract Urban Heating energy consumption in northern China accounts for 40% of total building energy consumption. In traditional Central Heating System, heat transfers from primary network (130°C/70°C) to secondary network (60°C/45°C) through heat exchangers in substations. In this paper, by introducing heat engine, heat pump and considering obtaining heat from environment, a new heat adaptor is built and the best System can be deduced out after thermodynamic optimization through extremum principle. The preliminary results indicate that when the return water temperature of primary network equals the ambient temperature, the Heating capacity reaches the maximal value, which increases by 40% compared to absorption heat exchange System. Thus the thermal performance of existing Heating Systems can be evaluated.

Yin Zhang - One of the best experts on this subject based on the ideXlab platform.

  • inverse problem and variation method to optimize cascade heat exchange network in Central Heating System
    Journal of Thermal Science, 2017
    Co-Authors: Yin Zhang, Yinping Zhang, Xin Wang
    Abstract:

    Urban Heating in northern China accounts for 40% of total building energy usage. In Central Heating Systems, heat is often transferred from heat source to users by the heat network where several heat exchangers are installed at heat source, substations and terminals respectively. For given overall Heating capacity and heat source temperature, increasing the terminal fluid temperature is an effective way to improve the thermal performance of such cascade heat exchange network for energy saving. In this paper, the mathematical optimization model of the cascade heat exchange network with three-stage heat exchangers in series is established. Aim at maximizing the cold fluid temperature for given hot fluid temperature and overall Heating capacity, the optimal heat exchange area distribution and the medium fluids’ flow rates are determined through inverse problem and variation method. The preliminary results show that the heat exchange areas should be distributed equally for each heat exchanger. It also indicates that in order to improve the thermal performance of the whole System, more heat exchange areas should be allocated to the heat exchanger where flow rate difference between two fluids is relatively small. This work is important for guiding the optimization design of practical cascade Heating Systems.

  • application of concept of heat adaptor determining an ideal Central Heating System using industrial waste heat
    Applied Thermal Engineering, 2017
    Co-Authors: Yin Zhang, Yinping Zhang, Xin Wang
    Abstract:

    Abstract In northern China, urban Heating energy consumption accounts for about 40% of the total building energy consumption and emits a lot of pollutants to atmosphere environment, while tremendous low grade industrial waste heat is discharged into the environment. Utilizing these industrial waste heat for Central Heating in winter is of great importance in energy saving and atmosphere environment protection. Hence, it raised more concerns during recent years. However, in traditional Systems, such waste heat is used to produce relatively low temperature supply water through heat exchangers. It leads to large mass flow rate in the primary network, which results in huge pumping energy consumption after long distance delivery, since the Heating users are often far away from the industrial waste heat sources. In this paper, applying the concept of heat adaptor put forward in our previous paper, an ideal Central Heating System using such industrial waste heat is determined. It is composed of two heat adaptors at heat source and substations respectively. The optimal return water temperature in the primary network of the ideal Central Heating System is derived to be the ambient air temperature. Compared with a conventional Central Heating System including heat exchanger System or absorption heat exchanger System, the return water temperature, mass flow rate and delivery pumping energy consumption of an ideal Central Heating System can be decreased greatly. In the illustrative example, the delivery pumping energy consumption is reduced by 82%, by using the proposed ideal Central Heating System. It is hoped that the method developed in the present paper is helpful for optimization design of practical Central Heating Systems using industrial waste heat.

  • application of heat adaptor thermodynamic optimization for Central Heating System through extremum principle
    Energy Procedia, 2015
    Co-Authors: Yin Zhang, Yinping Zhang, Xin Wang
    Abstract:

    Abstract Urban Heating energy consumption in northern China accounts for 40% of total building energy consumption. In traditional Central Heating System, heat transfers from primary network (130°C/70°C) to secondary network (60°C/45°C) through heat exchangers in substations. In this paper, by introducing heat engine, heat pump and considering obtaining heat from environment, a new heat adaptor is built and the best System can be deduced out after thermodynamic optimization through extremum principle. The preliminary results indicate that when the return water temperature of primary network equals the ambient temperature, the Heating capacity reaches the maximal value, which increases by 40% compared to absorption heat exchange System. Thus the thermal performance of existing Heating Systems can be evaluated.

Fotis N. Koumboulis - One of the best experts on this subject based on the ideXlab platform.

  • Modeling and Control of a Neutral Time Delay Test Case Central Heating System
    2020
    Co-Authors: Nikolaos D. Kouvakas, Fotis N. Koumboulis, P.n. Paraskevopoulos
    Abstract:

    In the present paper, the mathematical model of a test case Central Heating System is developed in the form of a nonlinear neutral time delay model which in turn is simplified to a neutral time delay model with constant time delay. In the process it is shown that the influence of the delay is significant, thus its incorporation to the model is of high importance. A PI controller is derived to control the temperature of a room which is modeled as a first order differential equation.

  • ETFA - Temperature control of a neutral time delay Central Heating System via a two term disturbance compensator
    2010 IEEE 15th Conference on Emerging Technologies & Factory Automation (ETFA 2010), 2010
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas
    Abstract:

    The control problem of a Central Heating System is studied via a PD controller feeding back the environment temperature and the performance output, i.e. the temperature of the heated room. The design goal is to compensate the influence of the environment temperature to the room temperature. To achieve this goal, a PI controller has supplementary been used. Even though, the controller is simple and easily implementable to low level control architectures, the performance the closed loop System is satisfactory. The parameters of the controller are computed using pure and mixed heuristic schemes based on the linearization of the nonlinear general neutral plant and minimizing the norm of the influence of the disturbance to the plant output.

  • Temperature control of a neutral time delay Central Heating System via a two term disturbance compensator
    2010 IEEE 15th Conference on Emerging Technologies & Factory Automation (ETFA 2010), 2010
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas
    Abstract:

    The control problem of a Central Heating System is studied via a PD controller feeding back the environment temperature and the performance output, i.e. the temperature of the heated room. The design goal is to compensate the influence of the environment temperature to the room temperature. To achieve this goal, a PI controller has supplementary been used. Even though, the controller is simple and easily implementable to low level control architectures, the performance the closed loop System is satisfactory. The parameters of the controller are computed using pure and mixed heuristic schemes based on the linearization of the nonlinear general neutral plant and minimizing the norm of the influence of the disturbance to the plant output.

  • On the Morgan's problem for neutral time delay Systems via dynamic controllers with application to a test case Central Heating System
    2009 IEEE Control Applications (CCA) & Intelligent Control (ISIC), 2009
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas, P.n. Paraskevopoulos
    Abstract:

    The Morgan's problem is investigated, using a realizable controller with dynamic measurement output feedback and dynamic precompensator for the general class of linear neutral multi delay Systems. It is proven that the necessary and sufficient condition for the solvability of the problem via a realizable controller is independent of the realizability requirement and it is the right invertibillity of the open loop transfer matrix. A class of controllers solving the problem is explicitly determined. The proposed technique is applied to a test case Central Heating System to achieve thermal autonomy. Based on the dynamic model of the Heating System the performance of the proposed control scheme is successfully illustrated through computational experiments.

  • CCA/ISIC - On the Morgan's problem for neutral time delay Systems via dynamic controllers with application to a test case Central Heating System
    2009 IEEE International Conference on Control Applications, 2009
    Co-Authors: Fotis N. Koumboulis, Nikolaos D. Kouvakas, P.n. Paraskevopoulos
    Abstract:

    The Morgan's problem is investigated, using a realizable controller with dynamic measurement output feedback and dynamic precompensator for the general class of linear neutral multi delay Systems. It is proven that the necessary and sufficient condition for the solvability of the problem via a realizable controller is independent of the realizability requirement and it is the right invertibillity of the open loop transfer matrix. A class of controllers solving the problem is explicitly determined. The proposed technique is applied to a test case Central Heating System to achieve thermal autonomy. Based on the dynamic model of the Heating System the performance of the proposed control scheme is successfully illustrated through computational experiments.

Ali Keçebaş - One of the best experts on this subject based on the ideXlab platform.

  • Remote control-based energy management for energy savings in a Central Heating System
    Environmental Progress and Sustainable Energy, 2017
    Co-Authors: Volkan Şahin, Yusuf Başoğul, Barış Gürel, Osman Ipek, Ali Keçebaş
    Abstract:

    © 2016 American Institute of Chemical Engineers Environ Prog In this study, to enhance the performance of a Central Heating System, the following tasks were performed on the System via Radio Frequency modems: collection of data, evaluation of the System, real time monitoring, remote control, and management processes. A Central Heating System testing apparatus and related software and hardware were developed. Both short-time and long-time experiments were conducted. In the experiments, Case 1, in which the System operated under ambient conditions for an hour without remote control, was compared with Case 2, in which the space temperature was kept constant at 21°C. The experimental results indicated that Case 2, in which remote control-based energy management was conducted, resulted in 20 L of fuel savings compared to Case 1, and a 57–60% thermal efficiency was measured. As a result, a Central Heating System using remote control-based energy management is more efficient, economical, and less harmful to the environment. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 600–609, 2017.

  • Remote control-based energy management for energy savings in a Central Heating System
    Environmental Progress, 2016
    Co-Authors: Volkan Şahin, Yusuf Başoğul, Barış Gürel, Osman Ipek, Ali Keçebaş
    Abstract:

    In this study, to enhance the performance of a Central Heating System, the following tasks were performed on the System via Radio Frequency modems: collection of data, evaluation of the System, real time monitoring, remote control, and management processes. A Central Heating System testing apparatus and related software and hardware were developed. Both short-time and long-time experiments were conducted. In the experiments, Case 1, in which the System operated under ambient conditions for an hour without remote control, was compared with Case 2, in which the space temperature was kept constant at 21°C. The experimental results indicated that Case 2, in which remote control-based energy management was conducted, resulted in 20 L of fuel savings compared to Case 1, and a 57–60% thermal efficiency was measured. As a result, a Central Heating System using remote control-based energy management is more efficient, economical, and less harmful to the environment. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 600–609, 2017