Shopping malls require large amount of electrical and thermal energy to provide quality services and maintain customer’s comfort. Conventionally, electrical energy for direct use and operation of HVAC systems is supplied directly from the electrical grid and is produced in remote power plants that burns fossil fuels. Thermal energy for hot water or heating supply is usually produced by boilers that use LP gas or fuel oil. Given these conditions, cogeneration and trigeneration systems supported by renewable sources of energy are ideal schemes to meet energy needing in a more efficient and cost-effective manner. For this reason, a hybrid trigeneration/photovoltaic system has been installed to cover approximately 50% of the electrical and thermal demands of a shopping mall complex, located in Morelia (MichoacÁn, Mexico). The trigeneration plant consists of a microturbine with an electric power output of 65 kW, three absorption chillers with an output of 5 RT each and a photovoltaic system of 30 kW of electrical power, composed of 108 photovoltaic modules of 280 W each. The Incentive Program for Technology Innovation of the National Council of Science and Technology has funded and sponsored the project and it is to demonstrate on-site feasibility under the Mexican energy context. The installation will generate information on the global and specific operation of the components. In this paper, the development and validation of thermodynamic models to analyze and simulate the individual and integral operation of the hybrid trigeneration/photovoltaic system components is presented. These models based on the First and Second law will allow an integral simulation of the plant to determine the most appropriate operating conditions. The First and Second law efficiencies as well as the exergy destruction in each component is reported. The models have been developed from data provided by manufacturers and the application of mass, energy and exergy balances. The validation of models has been carried out using experimental data acquired directly from the components of the plant and other measurement instruments that have been used for this purpose. The results of the models have been compared with experimental data and have showed satisfactory agreement, with an average difference of 2.92%.
Modelling and Validation of a Hybrid Trigeneration/Photovoltaic System Installed in a Shopping Mall Complex
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López Vega, A, Kowalski, GJ, Rubio-Maya, C, & Pacheco Ibarra, JJ. "Modelling and Validation of a Hybrid Trigeneration/Photovoltaic System Installed in a Shopping Mall Complex." Proceedings of the ASME 2017 International Mechanical Engineering Congress and Exposition. Volume 6: Energy. Tampa, Florida, USA. November 3–9, 2017. V006T08A019. ASME. https://doi.org/10.1115/IMECE2017-72020
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