Browsing by Author "Pereira, R."
Now showing 1 - 7 of 7
Results Per Page
Sort Options
- BIPV/T versus BIPV/T-PCM: A numerical investigation of advanced system integrated into Solar XXI building façadePublication . Aelenei, Laura Elena; Pereira, R.; Goncalves, Helder
- Energy saving potential of a hybrid BIPV-T system integrated with heat storage materialPublication . Aelenei, Laura Elena; Pereira, R.; Goncalves, Helder; Silva, António Rocha e
- Optimization assessment of the energy performance of a BIPV/T-PCM system using Genetic AlgorithmsPublication . Pereira, R.; Aelenei, Laura ElenaABSTRACT: In this paper, a BIPV/T-PCM installed in an office building façade is investigated to approach the system efficiency optimization using Genetic Algorithm method. Based on an updated mathematical model, theoretical simulation has been conducted for BIPV/T-PCM in this case for the existing system set-up (geometry-air cavity width, ventilation, system layers). Furthermore, field testing for this case has also been performed to validate the model, and then the simulated and experimental results are compared and found in considerably good agreement. The overall energy efficiency of the system was evaluated for winter and summer condition adopting different utilization strategies and optimization variables have been identified. The thermal and electric efficiencies were calculated based on the optimization variables and the results shown that the system can achieve a maximum overall efficiency of 64% with winter configuration and 32% with summer configuration.
- PV system with maximum power point tracking: modeling, simulation and experimental resultsPublication . Pereira, R.; Melício, R.; Mendes, V. M. F.; Joyce, AThis paper focuses on the five parameters modeling, consisting on a current controlled generator, single-diode, a shunt and series resistances. Also, a simulation, identification of the parameters for a photovoltaic system and the maximum power point tracking based on VP„g„g is presented. The identification of parameters and the performance of the equivalent circuit model for a solar module simulation are validated by data measured on the photovoltaic system.
- PV system with maximum power point tracking: modeling, simulation and experimental resultsPublication . Pereira, R.; Melício, R.; Mendes, V. M. F.; Joyce, AThis paper focuses on the five parameters modeling, consisting on a current controlled generator, single-diode, a shunt and series resistances. Also, a simulation, identification of the parameters for a photovoltaic system and the maximum power point tracking based on VP„g„g is presented. The identification of parameters and the performance of the equivalent circuit model for a solar module simulation are validated by data measured on the photovoltaic modules.
- A PV/T and Heat Pump based trigeneration system model for residential applicationsPublication . Joyce, A; Coelho, Luís; Martins, João F.; Tavares, Nelson; Pereira, R.; Magalhães, PedroA solar trigeneration system, based on photovoltaic-thermal (PV/T) collectors, photovoltaic (PV) modules and a heat pump unit for heating and cooling, is modelled to forecast the thermal and electric yields of the system. The aim of the trigeneration system is to provide enough electricity, domestic hot water (DHW), heating and cooling power to meet the typical demand of an urban single family dwelling with limited roof area and allow the household to achieve a positive net energy status. The PV/T collectors and PV modules provide the electricity while the former also powers the DHW component of the trigeneration system. The heating and cooling components rely on a vapour compression cycle heat pump unit powered by electricity. In Fong et al. (2010), solar-powered electric compression refrigeration was found to have the most energy saving potential in subtropical climates. Thus, a heat pump based cooling system is a cost effective solution for residential applications in Lisbon,Portugal. Thus, according to the dwelling's location, construction details and energy demand patterns, the model computes the system's net results by comparing the dwelling demand with the trigeneration system supply. The paper presents a breakdown of the proposed trigeneration system model and describes each component briefly. Preliminary results produced by the model are presented and analysed in order to identify possible ways of improving the overall system performance.
- Thermal performance of a hybrid BIPV-PCM: modeling, design and experimental investigationPublication . Aelenei, Laura Elena; Pereira, R.; Goncalves, Helder; Athienitis, AndreasIn this paper, a BIPV-PCM installed in an office building façade is investigated to approach the practical application of PV-PCM. Based on an updated mathematical model, theoretical simulation has been conducted for BIPV-PCM in this case. Furthermore, field testing for this case has also been performed to validate the model, and then the simulated and experimental results are compared and found in considerably good agreement. The experiments have been conducted during the winter time, as the prototype has been installed in January 2013. The experimental and numerical results show a good agreement, the maximum electrical efficiency of this BIPV-PCM can reach 10% and the thermal one 12%.