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Experimental investigation of a thermally powered central heating circulator: Pumping characteristics

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  • Markides, Christos N.
  • Gupta, Ajay

Abstract

A thermally powered circulator based on a two-phase thermofluidic oscillator was constructed and operated successfully as a replacement for a central heating hot water circulator coupled to a domestic gas-fired boiler. During regular operation the thermally powered circulator demonstrated a pumped flow-rate that decreased monotonically as the head applied across it increased. A maximum measured flow-rate of 850L/h was achieved at zero head, and a maximum head of 8.4 mH2O was attained at near-stalling (zero flow-rate) conditions. In agreement with previous modelling studies of the technology, increased inertia in the load line seems to lead to improved circulator performance. Further, the oscillating circulator exhibited an operational frequency between 0.24 and 0.33Hz, which was mostly determined by the circulator configuration. The pumping capacity was strongly affected by the oscillating liquid amplitudes in the power cylinder that defined the positive displacement amplitudes of the liquid piston into and out of the hot water circuit. The best circulator configuration was associated with lower operation frequencies and relatively large ratios of suction to discharge displacement.

Suggested Citation

  • Markides, Christos N. & Gupta, Ajay, 2013. "Experimental investigation of a thermally powered central heating circulator: Pumping characteristics," Applied Energy, Elsevier, vol. 110(C), pages 132-146.
    • Handle: RePEc:eee:appene:v:110:y:2013:i:c:p:132-146
    DOI: 10.1016/j.apenergy.2013.03.030
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    References listed on IDEAS

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    1. Solanki, Roochi & Mathie, Richard & Galindo, Amparo & Markides, Christos N., 2013. "Modelling of a two-phase thermofluidic oscillator for low-grade heat utilisation: Accounting for irreversible thermal losses," Applied Energy, Elsevier, vol. 106(C), pages 337-354.
    2. Bisio, G & Rubatto, G, 1999. "Sondhauss and Rijke oscillations—thermodynamic analysis, possible applications and analogies," Energy, Elsevier, vol. 24(2), pages 117-131.
    3. Markides, Christos N. & Osuolale, Adebayo & Solanki, Roochi & Stan, Guy-Bart V., 2013. "Nonlinear heat transfer processes in a two-phase thermofluidic oscillator," Applied Energy, Elsevier, vol. 104(C), pages 958-977.
    4. Markides, Christos N. & Smith, Thomas C.B., 2011. "A dynamic model for the efficiency optimization of an oscillatory low grade heat engine," Energy, Elsevier, vol. 36(12), pages 6967-6980.
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    Cited by:

    1. Taleb, Aly I. & Timmer, Michael A.G. & El-Shazly, Mohamed Y. & Samoilov, Aleksandr & Kirillov, Valeriy A. & Markides, Christos N., 2016. "A single-reciprocating-piston two-phase thermofluidic prime-mover," Energy, Elsevier, vol. 104(C), pages 250-265.
    2. Christoph J.W. Kirmse & Oyeniyi A. Oyewunmi & Andrew J. Haslam & Christos N. Markides, 2016. "Comparison of a Novel Organic-Fluid Thermofluidic Heat Converter and an Organic Rankine Cycle Heat Engine," Energies, MDPI, vol. 9(7), pages 1-26, June.
    3. Motamedi, Mahmoud & Ahmadi, Rouhollah & Jokar, H., 2018. "A solar pressurizable liquid piston stirling engine: Part 1, mathematical modeling, simulation and validation," Energy, Elsevier, vol. 155(C), pages 796-814.
    4. Tang, K. & Feng, Y. & Jin, S.H. & Jin, T. & Li, M., 2015. "Performance comparison of jet pumps with rectangular and circular tapered channels for a loop-structured traveling-wave thermoacoustic engine," Applied Energy, Elsevier, vol. 148(C), pages 305-313.
    5. Tan, Jingqi & Wei, Jianjian & Jin, Tao, 2020. "Electrical-analogy network model of a modified two-phase thermofluidic oscillator with regenerator for low-grade heat recovery," Applied Energy, Elsevier, vol. 262(C).
    6. Kirmse, Christoph J.W. & Oyewunmi, Oyeniyi A. & Taleb, Aly I. & Haslam, Andrew J. & Markides, Christos N., 2017. "A two-phase single-reciprocating-piston heat conversion engine: Non-linear dynamic modelling," Applied Energy, Elsevier, vol. 186(P3), pages 359-375.
    7. Wang, Kai & Sanders, Seth R. & Dubey, Swapnil & Choo, Fook Hoong & Duan, Fei, 2016. "Stirling cycle engines for recovering low and moderate temperature heat: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 62(C), pages 89-108.
    8. Ngangué, Max Ndamé & Stouffs, Pascal, 2020. "Dynamic simulation of an original Joule cycle liquid pistons hot air Ericsson engine," Energy, Elsevier, vol. 190(C).
    9. Nikunj Gangar & Sandro Macchietto & Christos N. Markides, 2020. "Recovery and Utilization of Low-Grade Waste Heat in the Oil-Refining Industry Using Heat Engines and Heat Pumps: An International Technoeconomic Comparison," Energies, MDPI, vol. 13(10), pages 1-29, May.
    10. Oyewunmi, Oyeniyi A. & Kirmse, Christoph J.W. & Haslam, Andrew J. & Müller, Erich A. & Markides, Christos N., 2017. "Working-fluid selection and performance investigation of a two-phase single-reciprocating-piston heat-conversion engine," Applied Energy, Elsevier, vol. 186(P3), pages 376-395.

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