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Evaluation of low-pressure flooded evaporator performance for adsorption chillers

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  • Thimmaiah, Poovanna Cheppudira
  • Sharafian, Amir
  • Rouhani, Mina
  • Huttema, Wendell
  • Bahrami, Majid

Abstract

In an adsorption chiller, the refrigerant (water) operating pressure is low (0.5–5 kPa) and the cooling power generation of a flooded evaporator is affected by the height of water column. To resolve this issue, we experimentally investigate the performance of a flooded evaporator as a function of water height. The results show an optimum water height equal to 80% of the tube diameter leading to achieve the highest cooling power. Under this condition, the internal and external thermal resistances on the inside and outside of the evaporator tubes account for up to 73% of the overall thermal resistance. To reduce the internal thermal resistance, twisted and Z-type turbulent flow generators are incorporated into the evaporator tubes. The evaporator cooling power shows an increase by 12% and 58% when twisted tape and Z-type turbulators are used at a cost of an increase in the internal pressure drop by 2.5 and 14.5 times, respectively. The twisted tape and Z-type turbulators improve the average specific cooling power of the adsorption chiller by 9% and 47%, respectively. To reduce the external thermal resistance, the outside surface of the evaporator tubes is coated with porous copper. The coated evaporator increases the overall heat transfer coefficient by 1.4 times and improves the specific cooling power of the adsorption chiller by 48% compared to the uncoated tubes.

Suggested Citation

  • Thimmaiah, Poovanna Cheppudira & Sharafian, Amir & Rouhani, Mina & Huttema, Wendell & Bahrami, Majid, 2017. "Evaluation of low-pressure flooded evaporator performance for adsorption chillers," Energy, Elsevier, vol. 122(C), pages 144-158.
    • Handle: RePEc:eee:energy:v:122:y:2017:i:c:p:144-158
    DOI: 10.1016/j.energy.2017.01.085
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    References listed on IDEAS

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    3. Karol Sztekler & Tomasz Siwek & Wojciech Kalawa & Lukasz Lis & Lukasz Mika & Ewelina Radomska & Wojciech Nowak, 2021. "CFD Analysis of Elements of an Adsorption Chiller with Desalination Function," Energies, MDPI, vol. 14(22), pages 1-19, November.
    4. Jaroslaw Krzywanski, 2019. "A General Approach in Optimization of Heat Exchangers by Bio-Inspired Artificial Intelligence Methods," Energies, MDPI, vol. 12(23), pages 1-32, November.
    5. Chao, Jingwei & Xu, Jiaxing & Yan, Taisen & Xiang, Shizhao & Bai, Zhaoyuan & Wang, Ruzhu & Li, Tingxian, 2023. "Performance analysis of sorption thermal battery for high-density cold energy storage enabled by novel tube-free evaporator," Energy, Elsevier, vol. 273(C).
    6. He, Fang & Nagano, Katsunori & Seol, Sung-Hoon & Togawa, Junya, 2022. "Thermal performance improvement of AHP using corrugated heat exchanger by dip-coating method with mass recovery," Energy, Elsevier, vol. 239(PE).
    7. Abadi, G. Bamorovat & Bahrami, Majid, 2020. "Combined evaporator and condenser for sorption cooling systems: A steady-state performance analysis," Energy, Elsevier, vol. 209(C).
    8. Chao, Jingwei & Xu, Jiaxing & Xiang, Shizhao & Bai, Zhaoyuan & Yan, Taisen & Wang, Pengfei & Wang, Ruzhu & Li, Tingxian, 2023. "High energy-density and power-density cold storage enabled by sorption thermal battery based on liquid-gas phase change process," Applied Energy, Elsevier, vol. 334(C).

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