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Integration of Municipal Air-Conditioning, Power, and Gas Supplies Using an LNG Cold Exergy-Assisted Kalina Cycle System

Author

Listed:
  • Dereje S. Ayou

    (Department of Mechanical Engineering, Khalifa University, Abu Dhabi 127788, UAE)

  • Valerie Eveloy

    (Department of Mechanical Engineering, Khalifa University, Abu Dhabi 127788, UAE)

Abstract

A Kalina cycle-based integration concept of municipal air-conditioning, electricity and gas is investigated thermodynamically, economically, and environmentally to reduce the carbon intensity of these supplies, with attention to hot climatic conditions. The proposed poly-generation system is driven by low-grade renewable or surplus heat, and utilizes waste exergy from liquefied natural gas vaporization for refrigeration and power augmentation. At nominal conditions (130 °C driving heat), approximately 561 and 151 kJ of refrigeration and useful power per kg of liquefied natural gas regasified are generated by the proposed system, respectively, at effective first-law and exergetic efficiencies of 33% and 35%, respectively. The Kalina sub-system condenser cryogenic heat rejection condition is found to triple the system useful electrical output compared with high ambient temperature condenser heat sinking conditions. Per million ton per annum of liquefied natural gas vaporization capacity, yearly net power savings of approximately 74 GWh e could be achieved compared to standard air-conditioning, electricity, and gas supply systems, resulting in 11.1 kton of natural gas saved and 30.4 kton of carbon dioxide-equivalent emissions avoided annually. The yearly net monetary savings would range from 0.9 to 4.7 million USD per million ton per annum of liquefied natural gas regasified at local subsidized and international electricity market prices, respectively, with corresponding payback periods of 1.7 and 2.5 years, respectively.

Suggested Citation

  • Dereje S. Ayou & Valerie Eveloy, 2020. "Integration of Municipal Air-Conditioning, Power, and Gas Supplies Using an LNG Cold Exergy-Assisted Kalina Cycle System," Energies, MDPI, vol. 13(18), pages 1-31, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4599-:d:408888
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    References listed on IDEAS

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    1. Maytungkorn Sermsuk & Yanin Sukjai & Montri Wiboonrat & Kunlanan Kiatkittipong, 2021. "Utilising Cold Energy from Liquefied Natural Gas (LNG) to Reduce the Electricity Cost of Data Centres," Energies, MDPI, vol. 14(19), pages 1-17, October.
    2. Valerie Eveloy & Yusra Alkendi, 2021. "Thermodynamic Performance Investigation of a Small-Scale Solar Compression-Assisted Multi-Ejector Indoor Air Conditioning System for Hot Climate Conditions," Energies, MDPI, vol. 14(14), pages 1-31, July.
    3. Sermsuk, Maytungkorn & Sukjai, Yanin & Wiboonrat, Montri & Kiatkittipong, Kunlanan, 2022. "Feasibility study of a combined system of electricity generation and cooling from liquefied natural gas to reduce the electricity cost of data centres," Energy, Elsevier, vol. 254(PA).

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