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Comparison of Conventional and Variable Borehole Heat Exchangers for Use in a Desiccant Assisted Air Conditioning System

Author

Listed:
  • Finn Richter

    (Institute of Engineering Thermodynamics, Hamburg University of Technology, Denickestrasse 17, 21073 Hamburg, Germany)

  • Peter Niemann

    (Institute of Engineering Thermodynamics, Hamburg University of Technology, Denickestrasse 17, 21073 Hamburg, Germany)

  • Matthias Schuck

    (Institute of Geotechnical Engineering and Construction Management, Hamburg University of Technology, Harbuger Schlossstrasse 20, 21079 Hamburg, Germany)

  • Jürgen Grabe

    (Institute of Geotechnical Engineering and Construction Management, Hamburg University of Technology, Harbuger Schlossstrasse 20, 21079 Hamburg, Germany)

  • Gerhard Schmitz

    (Institute of Engineering Thermodynamics, Hamburg University of Technology, Denickestrasse 17, 21073 Hamburg, Germany)

Abstract

The objective of this work is to analyze a gas injection borehole heat exchanger coupled with a desiccant assisted air conditioning system during cooling and heating operation. A common problem that occurs in air conditioning systems is peak loads, during which the cooling or heating power of the soil can be exceeded. To counteract this drawback, a gas injection borehole heat exchanger, which is capable of creating artificial groundwater flow along the heat exchanger by inducing a pressure difference inside the well, is used. Experimental results of the performance differences between a conventional and a gas injection borehole heat exchanger are presented. Under the same inlet conditions, a reduction in the outlet temperature of up to 2 °C is achieved compared with an equivalent conventional borehole heat exchanger in cooling mode. The maximum cooling power is increased by 26%. As a result, a fast and dynamic responding control of the heat transfer between the heat exchanger and the soil is possible. During winter operation, despite the lower drilling depth of the gas injection borehole heat exchanger system, the performance is within the range of a conventional system. The power increase is limited to around 0.2 kW th at a steady state. In conclusion, gas injection borehole heat exchangers can be promising in terms of reliable peak load handling within large geothermal fields.

Suggested Citation

  • Finn Richter & Peter Niemann & Matthias Schuck & Jürgen Grabe & Gerhard Schmitz, 2021. "Comparison of Conventional and Variable Borehole Heat Exchangers for Use in a Desiccant Assisted Air Conditioning System," Energies, MDPI, vol. 14(4), pages 1-12, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:926-:d:496909
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    References listed on IDEAS

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    1. Naicker, Selvaraj S. & Rees, Simon J., 2018. "Performance analysis of a large geothermal heating and cooling system," Renewable Energy, Elsevier, vol. 122(C), pages 429-442.
    2. Tomislav Kurevija & Adib Kalantar & Marija Macenić & Josipa Hranić, 2019. "Investigation of Steady-State Heat Extraction Rates for Different Borehole Heat Exchanger Configurations from the Aspect of Implementation of New TurboCollector™ Pipe System Design," Energies, MDPI, vol. 12(8), pages 1-17, April.
    3. Speerforck, Arne & Schmitz, Gerhard, 2016. "Experimental investigation of a ground-coupled desiccant assisted air conditioning system," Applied Energy, Elsevier, vol. 181(C), pages 575-585.
    4. Cui, Yuanlong & Zhu, Jie & Twaha, Ssennoga & Riffat, Saffa, 2018. "A comprehensive review on 2D and 3D models of vertical ground heat exchangers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 94(C), pages 84-114.
    5. Eicker, Ursula & Vorschulze, Christoph, 2009. "Potential of geothermal heat exchangers for office building climatisation," Renewable Energy, Elsevier, vol. 34(4), pages 1126-1133.
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    Cited by:

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