Techno-economic and Environmental Analysis of an Innovative ORC-based Micro-scale CCHP System under Mediterranean Conditions

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Abstract

With the obvious lack of investments and timely reforms, the Lebanese energy sector is neither reliable nor reasonably priced, creating a heavy burden on public resources and becoming an obstacle for the social and economic development. Due to the lack of conventional fossil fuel energy resources, energy needs are majorly met through oil products import, with no effective harnessing of the potential renewable energy resources. Considering the high energy demand for cooling, heating and electricity and with more than 300 annual sunny days, an innovative hybrid biomass-solar driven micro-scale tri-generation system is proposed to provide cooling, heating and electricity under Lebanese conditions. The system comprises an organic Rankine cycle-based combined heat and power unit, a liquid desiccant dehumidification unit and a dew point evaporative cooling unit with a cross flow heat and mass exchanger and a psychrometric energy core. A complete technical, economic and environmental assessment of the micro-scale tri-generation system is performed to assess its applicability and feasibility. Employing a 2 kWe ORC-based CHP unit with a micro-scale scroll expander, the useful heat output of the system ranges between 4.2 and 11.75 kW, with an electric power capacity between 0.7 and 1.92 kW. The maximum hourly cooling capacity delivered by the coupled cooling and dehumidification system is attained in August with about 8.7 kW. The tri-generation system allows annual savings of 8226 USD on the heating bill, 961 USD on the electricity bill and 951 USD on the cooling bill compared to conventional production technologies. In addition, the CO 2 emissions reduction due to the system implementation ranges between 3.1 tonnes in June and 9.2 tonnes in March. The overall investigation carried out in this study demonstrates the large potential of using such renewable energy-driven micro-scale tri-generation systems under the Lebanese conditions compared to the conventional separate energy production technologies.

Original languageEnglish
Title of host publicationProceedings of 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
EditorsJosé Carlos Teixeira
Publication date2018
Article number255
ISBN (Electronic)978-972-99596-4-6
Publication statusPublished - 2018
Event31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems - Guimarães, Portugal
Duration: 17. Jun 201821. Jun 2018

Conference

Conference31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems
Country/TerritoryPortugal
CityGuimarães
Period17/06/201821/06/2018

Keywords

  • Environmental analysis
  • Evaporative cooling
  • Liquid desiccant dehumidification
  • Micro-scale tri-generation system
  • Organic Rankine cycle
  • Techno-economic

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