Browsing Comunicacions a congressos (Enginyeria Industrial i de l’Edificació) by Author "Arteconi, Alessia"
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- ItemOpen AccessBlack box modelling of a latent heat thermal energy storage system coupled with heat pipes(IOP Publishing, 2018) Arteconi, Alessia; Ferracuti, Francesco; Tascioni, Roberto; Mahkamov, Khamid; Kenisarin, Murat; Costa, Carolina; Cabeza, Luisa F.; Gracia Cuesta, Alvaro de; Halimic, Elvedin; Mullen, David; Lynn, Kevin; Cioccolanti, LucaThis paper presents black box models to represent a LHTESS (Latent Heat Thermal Energy Storage System) coupled with heat pipes, aimed at increasing the storage performance and at decreasing the time of charging/discharging. The presented storage system is part of a micro solar CHP plant and the developed model is intended to be used in the simulation tool of the overall system, thus it has to be accurate but also fast computing. Black box data driven models are considered, trained by means of numerical data obtained from a white box detailed model of the LHTESS and heat pipes system. A year round simulation of the system during its normal operation within the micro solar CHP plant is used as dataset. Then the black box models are trained and finally validated on these data. Results show the need for a black box model that can take into account the different seasonal performance of the LHTESS. In this analysis the best fit was achieved by means of Random Forest models with an accuracy higher than 90%.
- ItemOpen AccessInnovative concentrated solar micro organic Rankine cycle plant system for residential buildings(Edicions de la Universitat de Lleida, 2019) Maldonado, José Miguel; Gracia Cuesta, Alvaro de; Mahkamov, Khamid; Costa, Carolina; Kenisarin, Murat; Pili, Piero; Manca, Roberto; Leroux, Arthur; Mintsa, André Charles; Bartolini, Carlo M.; Pirro, Matteo; Lynn, Kevin; Mullen, David; Halimic, Elvedin; Cioccolanti, Luca; Arteconi, Alessia; Gimbernat, Toni; Botargues, Teresa; Cabeza, Luisa F.Reducing the energy consumption in the building sector, as well as its associated CO2 emissions, is one of the main environmental concerns at worldwide level. In developed countries, the building sector means 41% of the total energy consumption and 40% of the total greenhouse gases emissions. To improve the energy efficiency of residential buildings, several energy strategies were carried out in European countries to encourage the development of active energy saving systems; such as the solar thermal energy. The presented study is in the frame of the Innova MicroSolar European project, which is sponsored by the European Union’s Horizon 2020 research and innovation programme. The main goal of this project is to develop an innovative concentrated solar heat and power system for residential buildings, which supplies 2-kWelec and 18-kWth. This technology includes a concentrated solar system, a high performance micro organic Rankine cycle (ORC) turbine, and an enhanced latent heat thermal energy storage (LHTES). The solar system is based on linear Fresnel mirrors which are considerably easier and cheaper to manufacture than their parabolic equals. Also, the mirrors are led by a sun tracking mechanism so they are always focusing the absorber tubes, heating up to 295ºC the heat transfer fluid (HTF) flow. The total area of the real scale prototype solar field is 140 square metres, which could provide from 80 to 15 kWth. The micro ORC technology is equipped with a high speed permanent magnet AC alternator able to supply 2.3 kWel. The ORC block has to be fed with 22 kWth. Finally, the TES tank consists of two main blocks, the PCM tank and the enhanced heat sink. Both blocks are connected between them by reversible heat pipes as heat carrier. The storage is designed to supply 25 kWth during four working hours. The whole system will supply 60% of the total building energy demand, reducing the energy cost up to 20%, as well as the greenhouse gases emissions when comparing against the best renewable energy technologies available on the market. This study shows the first experiments of the whole systems. The HTF (Therminol 62) is heated up to 270ºC with the solar field, then the HTF is lead to the ORC evaporator and the organic fluid (cyclopenthane) evaporates and runs the turbine. The TES tank is charged when the solar field reaches maximum power levels. Once the solar production cannot run the ORC, the solar field is bypassed and the TES tank successfully becomes the main energy supplier.
- ItemOpen AccessNumerical Investigation of the Pipelines modeling in a Small-Scale Concentrated Solar Combined Heating and Power Plant(ICCHMT 2019, 2019) Tascioni, Roberto; Arteconi, Alessia; Del Zotto, Luca; Habib, Emanuele; Bocci, Enrico; Moradi, Ramin; Mahkamov, Khamid; Costa, Carolina; Cabeza, Luisa F.; Gracia Cuesta, Alvaro de; Pili, Piero; Mintsa, André Charles; Pirro, Matteo; Gimbernat, Toni; Botargues, Teresa; Halimic, Elvedin; Cioccolanti, LucaIn this paper four different detailed models of pipelines have been proposed, they are supposed to be used in a quasi steady-state model of a micro solar Combined Heat and Power plant developed under the EU funded project Innova MicroSolar. The integrated plant consists of a Linear Fresnel Reflectors solar field, 3.8 tons of Latent Heat Thermal Energy Storage system equipped with reversible heat pipes and an Organic Rankine Cycle unit designed for a power production of 2 kWe/18 kWth. Previous numerical analyses carried out by some of the authors have revealed a high incidence of pipelines on the plant performance due to thermal losses and their dynamic behavior. Hence, in this paper four different levels of models detail of such pipelines have been developed and tested based on the micro CHP operating conditions in order to find out which approach provides the most accurate dynamic behavior in small scale CHP systems simulations.
- ItemOpen AccessNumerical investigation of the smart energy management of modular latent heat thermal storage on the performance of a micro-solar power plant(ECOS2019 - 32 th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems, 2019) Tascioni, Roberto; Cioccolanti, Luca; Del Zotto, Luca; Mahkamov, Khamid; Kenisarin, Murat; Costa, Carolina; Cabeza, Luisa F.; Gracia Cuesta, Alvaro de; Maldonado, José Miguel; Halimic, Elvedin; Mullen, David; Lynn, Kevin; Arteconi, AlessiaSolar energy is widely considered as one of the most attractive renewable energy source to curb CO2 emissions at residential level where micro-cogeneration has a very interesting potential. One promising application of solar energy is in combination with Organic Rankine Cycle (ORC) plants due to the ability to utilize low-medium temperature heat sources. However, because of the intermittent availability of solar energy, thermal energy storage (TES) systems are required to improve the performance of such systems and assure their prolonged operation. At medium temperatures, latent heat thermal energy storage (LHTES) systems allow to effectively store and release the collected thermal energy from the solar field. However, room for improvements exists to increase their efficiency when in operation. For this reason, in this work the authors have numerically investigated the performance of a 2 kWe micro-solar ORC plant coupled with an innovative LHTES system that is going to be built and tested under the EU funded project Innova MicroSolar. The novel LHTES, developed and designed by some partners of the Consortium, is subdivided into six modules and consists of 3.8 tons of high-temperature phase change material. In this study the effect of the storage volume partialization on the performance of the integrated plant is evaluated using a fuzzy logic approach. Main aim of the storage management is to achieve a reduction of the thermal losses and improve the plant overall efficiency. Annual dynamic simulations are performed in order to determine the optimal storage volume needed in different operating conditions. Results clearly show a remarkable annual increase in electric and thermal energy production of 8 % and 6 % respectively, in comparison with the configuration without fuzzy logic control: this achievement was obtained decreasing the working LHTES modules in winter and conversely increasing them in summer.