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Performance simulation of a solar-assisted micro-tri-generation system: hotel case study

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  • Ana I. Palmero-Marrero
  • Armando C. Oliveira

Abstract

In this work, a micro-tri-generation system integrated with a solar system is studied. A basic micro-cogeneration technology [micro-CHP (combined heat and power) system] integrating solar collectors, storage tank, micro-turbine and a thermodynamic cycle based on the organic Rankine cycle (ORC) is combined with an absorption chiller. The heat rejected at the condenser of the micro-CHP system is used for water heating (WH), and the absorption chiller is used for space cooling. Hot water from the solar storage tank is the heat source for the cooling system (absorption chiller) and the micro-CHP system. A heat exchanger is used to transfer heat from the hot water circuit to the power cycle (which uses an organic refrigerant). The micro-CHP system under analysis uses a micro-turbine and an electric generator with a power output of 5 kW. The turbine inlet temperature is 80°C and the working fluid is cyclohexane. The absorption chiller, which is a single-effect water-fired chiller, operates with a lithium bromide and water mixture, and water inlet temperature is between 80 and 100°C. The performance for different solar collector areas and tank capacities was evaluated through a numerical model. A hotel building was used as a case study and the analysis was extended throughout the cooling season, for climatic conditions of different European cities: Athens (Greece), Lisbon (Portugal), Madrid (Spain), Paris (France) and London (UK). The monthly average solar fraction was evaluated for different cases: the micro-CHP system, the cooling system and the micro-tri-generation system with the useful condenser energy used for WH. The solar fraction of the micro-CHP system was low, compared with that of the cooling system, because the efficiency of the micro-CHP system is lower than 7%. However, when the tri-generation system is considered, the monthly average solar fraction is much higher, due to the utilization of the condenser heat. The solar system, cooling system and its components were modelled with the TRNSYS simulation program. The micro-CHP system was modelled with EES software. Copyright , Oxford University Press.

Suggested Citation

  • Ana I. Palmero-Marrero & Armando C. Oliveira, 2011. "Performance simulation of a solar-assisted micro-tri-generation system: hotel case study," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 6(4), pages 309-317, July.
    • Handle: RePEc:oup:ijlctc:v:6:y:2011:i:4:p:309-317
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    File URL: http://hdl.handle.net/10.1093/ijlct/ctr028
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    Cited by:

    1. Liu, Mingxi & Shi, Yang & Fang, Fang, 2014. "Combined cooling, heating and power systems: A survey," Renewable and Sustainable Energy Reviews, Elsevier, vol. 35(C), pages 1-22.
    2. Ayub, Mohammad & Mitsos, Alexander & Ghasemi, Hadi, 2015. "Thermo-economic analysis of a hybrid solar-binary geothermal power plant," Energy, Elsevier, vol. 87(C), pages 326-335.
    3. Mirzaei, Mohammad Reza & Kasaeian, Alibakhsh & Sadeghi Motlagh, Maryam & Fereidoni, Sahar, 2024. "Thermo-economic analysis of an integrated combined heating, cooling, and power unit with dish collector and organic Rankine cycle," Energy, Elsevier, vol. 296(C).
    4. Abdul Mujeebu, Muhammad & Alshamrani, Othman Subhi, 2016. "Prospects of energy conservation and management in buildings – The Saudi Arabian scenario versus global trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 1647-1663.

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