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A new version of the Large Temperature Jump method: The thermal response (T–LTJ)

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  • Tokarev, M.M.
  • Aristov, Yu.I.

Abstract

In this communication, we propose a new version of the Large Temperature Jump (LTJ) method for studying the ad/desorption dynamics on representative pieces of heat exchangers (HEx) used in real adsorption chillers. This method is based on direct measurement of the temperature difference ΔT of a heat carrier at the inlet and outlet of the tested HEx fragment after a fast drop/jump of the inlet temperature. This tightly repeats the procedure used in real HExs for transformation and storage of low temperature heat. For the sake of validation, the measurements were carried out with the same adsorbent (AQSOA FAM-Z02) and HEx as well as under the same conditions already comprehensively studied in [1]. It is demonstrated that the measured ΔT-response allows studying ad/desorption dynamics, extracting the characteristic process time and heat with sufficient accuracy. The new Thermal Large Temperature Jump (T-LTJ) method gives similar information as the G-LTJ version being more simple in realization and close to the common procedure for evaluating dynamic performance of real adsorptive chillers. Moreover, the T-LTJ provides valuable information about the heat flux directly transferred to a heat carrier fluid that is not available from other LTJ versions.

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  • Tokarev, M.M. & Aristov, Yu.I., 2017. "A new version of the Large Temperature Jump method: The thermal response (T–LTJ)," Energy, Elsevier, vol. 140(P1), pages 481-487.
    • Handle: RePEc:eee:energy:v:140:y:2017:i:p1:p:481-487
    DOI: 10.1016/j.energy.2017.08.093
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    References listed on IDEAS

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    1. Santamaria, Salvatore & Sapienza, Alessio & Frazzica, Andrea & Freni, Angelo & Girnik, Ilya S. & Aristov, Yuri I., 2014. "Water adsorption dynamics on representative pieces of real adsorbers for adsorptive chillers," Applied Energy, Elsevier, vol. 134(C), pages 11-19.
    2. Sharafian, Amir & Nemati Mehr, Seyyed Mahdi & Thimmaiah, Poovanna Cheppudira & Huttema, Wendell & Bahrami, Majid, 2016. "Effects of adsorbent mass and number of adsorber beds on the performance of a waste heat-driven adsorption cooling system for vehicle air conditioning applications," Energy, Elsevier, vol. 112(C), pages 481-493.
    3. Wang, R.Z. & Xu, Z.Y. & Pan, Q.W. & Du, S. & Xia, Z.Z., 2016. "Solar driven air conditioning and refrigeration systems corresponding to various heating source temperatures," Applied Energy, Elsevier, vol. 169(C), pages 846-856.
    4. Girnik, Ilya S. & Aristov, Yuri I., 2016. "Dynamic optimization of adsorptive chillers: The “AQSOA™-FAM-Z02 – Water” working pair," Energy, Elsevier, vol. 106(C), pages 13-22.
    5. Sapienza, Alessio & Santamaria, Salvatore & Frazzica, Andrea & Freni, Angelo & Aristov, Yuri I., 2014. "Dynamic study of adsorbers by a new gravimetric version of the Large Temperature Jump method," Applied Energy, Elsevier, vol. 113(C), pages 1244-1251.
    6. Aristov, Yuri I., 2017. "Adsorptive transformation and storage of renewable heat: Review of current trends in adsorption dynamics," Renewable Energy, Elsevier, vol. 110(C), pages 105-114.
    7. Zhao, Y.J. & Wang, R.Z. & Li, T.X. & Nomura, Y., 2016. "Investigation of a 10 kWh sorption heat storage device for effective utilization of low-grade thermal energy," Energy, Elsevier, vol. 113(C), pages 739-747.
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    Cited by:

    1. Tokarev, M.M. & Zlobin, A.A. & Aristov, Yu.I., 2019. "A new version of the large pressure jump (T-LPJ) method for dynamic study of pressure-initiated adsorptive cycles for heat storage and transformation," Energy, Elsevier, vol. 179(C), pages 542-548.
    2. Aristov, Yuri I., 2020. "Dynamics of adsorptive heat conversion systems: Review of basics and recent advances," Energy, Elsevier, vol. 205(C).
    3. Palomba, Valeria & Sapienza, Alessio & Aristov, Yuri, 2019. "Dynamics and useful heat of the discharge stage of adsorptive cycles for long term thermal storage," Applied Energy, Elsevier, vol. 248(C), pages 299-309.
    4. Mohammadzadeh Kowsari, Milad & Niazmand, Hamid & Tokarev, Mikhail Mikhailovich, 2018. "Bed configuration effects on the finned flat-tube adsorption heat exchanger performance: Numerical modeling and experimental validation," Applied Energy, Elsevier, vol. 213(C), pages 540-554.

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