The Experts below are selected from a list of 13224 Experts worldwide ranked by ideXlab platform
Gunter Rockendorf - One of the best experts on this subject based on the ideXlab platform.
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simulation and evaluation of solar thermal combi systems with direct integration of solar heat into the space Heating Loop
Energy Procedia, 2016Co-Authors: Jens Glembin, Thomas Haselhorst, Jan Steinweg, Gunter RockendorfAbstract:Abstract Usually, solar heat in combi systems is used via a buffer storage. In contrast to that, the solar collectors may be connected directly to the space Heating circuit in order to store the heat in the building itself. Such a direct solar integration is investigated within system simulations for different layouts and Heating elements. The simulations show significant reductions in the final energy demand as well as an increasing solar yield due to less thermal losses of the storage tank compared to the usual solution with one buffer storage. A prototype of one of the investigated Heating concepts within a single family house proofs the functionality of the system concept and the high solar yield, particularly at low radiation levels. Since only a few manufacturers provide such system solutions with a direct solar integration, the results may have an important impact on the future development of combi systems.
Stevan Dubljevic - One of the best experts on this subject based on the ideXlab platform.
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receding horizon optimal operation and control of a solar thermal district Heating system
Aiche Journal, 2018Co-Authors: Yuan Yuan, Stevan DubljevicAbstract:This work focuses on the receding horizon optimal control for a solar-thermal district Heating (STDH) system containing lumped parameter and distributed parameter subsystems. A common STDH system includes solar collector system, a short-term energy storage tank and a district Heating Loop system with a secondary gas boiler system. The inclusion or exclusion of these components leads to different operational and working modes. Detailed system description and mathematical models are provided, and three working modes are introduced and in each mode several operations are demonstrated and addressed. Single-objective and multiobjective problems are formulated. Moreover, in the mode where gas boiler system is included to help addressing the district Heating demand, the internal model based boundary servo-control approach is proposed and applied to obtain desired boiler water temperatures such that the expected district Heating demand can be satisfied. Moreover, a boundary state observer is designed for the considered solar collector system. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1217–1233, 2018
Louis Gosselin - One of the best experts on this subject based on the ideXlab platform.
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Combined Heating and cooling networks with waste heat recovery based on energy hub concept
Applied Energy, 2019Co-Authors: Hossein Ahmadisedigh, Louis GosselinAbstract:Abstract Waste heat recovery can help reducing operation costs and greenhouse gas emissions. In the present work, an “energy hub” template was employed to design combined Heating and cooling networks in which heat pumps can be used to recover heat from the cooling Loop and supply it to the Heating Loop. Heating and cooling loads of the network can be satisfied by natural gas boilers, electric boilers, chillers, and heat pumps. The design of the system and its operation over the year were optimized with respect to cost and greenhouse gas emissions under different combinations of Heating and cooling loads. The introduction of 8760-h synthetic loads allowed covering several possible load profiles driving the energy hub. The contribution of each possible energy source and technology and the sizing of the heat pump system are optimized, while ensuring satisfaction of the Heating and cooling demands. The optimized hub configurations for scenarios with and without waste heat recovery were compared, showing that heat pumps were beneficial in all scenarios. The optimal capacity of heat pumps to minimize total cost was found to be ∼80% of the maximal possible value from a thermodynamic analysis of the loads. The simultaneous minimization of cost and emissions revealed a relatively sharp transition from gas to electric Heating as more emphasis is put on emissions than cost, but in all cases, waste heat recovery with heat pumps was heavily used to satisfy the Heating and cooling loads.
Jens Glembin - One of the best experts on this subject based on the ideXlab platform.
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simulation and evaluation of solar thermal combi systems with direct integration of solar heat into the space Heating Loop
Energy Procedia, 2016Co-Authors: Jens Glembin, Thomas Haselhorst, Jan Steinweg, Gunter RockendorfAbstract:Abstract Usually, solar heat in combi systems is used via a buffer storage. In contrast to that, the solar collectors may be connected directly to the space Heating circuit in order to store the heat in the building itself. Such a direct solar integration is investigated within system simulations for different layouts and Heating elements. The simulations show significant reductions in the final energy demand as well as an increasing solar yield due to less thermal losses of the storage tank compared to the usual solution with one buffer storage. A prototype of one of the investigated Heating concepts within a single family house proofs the functionality of the system concept and the high solar yield, particularly at low radiation levels. Since only a few manufacturers provide such system solutions with a direct solar integration, the results may have an important impact on the future development of combi systems.
Steva Dubljevic - One of the best experts on this subject based on the ideXlab platform.
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modelling and control of solar thermal system with borehole seasonal storage
Renewable Energy, 2017Co-Authors: Steva DubljevicAbstract:The paper addresses the problem of controlling a solar thermal storage system with the purpose of achieving a desired thermal comfort level and energy savings. A solar thermal power plant is used for Heating district houses with borehole seasonal energy storage. As the energy output from the solar thermal plant with borehole seasonal storage varies, the control system maintains the thermal comfort by using a servo controller. In this work, the modelling of the solar thermal system with borehole seasonal storage is inspired by the Drake Landing Solar Community in Okotoks, Alberta, Canada [1]. The discrete model of the integrated energy system is obtained by using energy preserving Cayley-Tustin discretization. A simple and easily realizable servo control algorithm is designed to regulate the system operating at desired thermal comfort level despite disturbances from the solar thermal plant system, the borehole geo-thermal energy storage system and/or the district Heating Loop system. Finally, the performance of the servo controller and frequency analysis of the plant is given in simulation results section.