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Closed-loop oscillating heat-pipe with check valves (CLOHP/CVs) air-preheater for reducing relative humidity in drying systems

Author

Listed:
  • Meena, P.
  • Rittidech, S.
  • Poomsa-ad, N.

Abstract

A CLOHP/CV air-preheater has been used for recovering the waste heat from the drying cycle. The CLOHP/CV heat-exchanger consisted of copper tubes 3.58 m long and internal diameter 0.002 m. The evaporator and condenser sections were 0.19 m long, the adiabatic sections 0.08 m long, the hot air velocity was 0.5, 0.75 or 1.0 m/s with the hot air temperature 50, 60 or 70 °C, and the relative humidity was 100%. The working fluid was R134a with a filling ratio of 50%. The hot-air temperature increased from 50 to 70 °C; the heat-transfer rate increased slightly. The velocity increase from 0.5 0.75, to 1.0 m/s led to the heat-transfer rate slightly decreasing. The velocity increase from 0.5 to 1 m/s led to a slight decrease in effectiveness. As the hot-air temperature increases from 50 to 70 °C, the effectiveness slightly increased; and the relative humidity was reduced to the range 54-72% from 89% to 100%. The CLOHP/CV air-preheater can reduce the relative humidity and achieve energy thrift.

Suggested Citation

  • Meena, P. & Rittidech, S. & Poomsa-ad, N., 2007. "Closed-loop oscillating heat-pipe with check valves (CLOHP/CVs) air-preheater for reducing relative humidity in drying systems," Applied Energy, Elsevier, vol. 84(4), pages 363-373, April.
    • Handle: RePEc:eee:appene:v:84:y:2007:i:4:p:363-373
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    References listed on IDEAS

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    1. Rittidech, S. & Dangeton, W. & Soponronnarit, S., 2005. "Closed-ended oscillating heat-pipe (CEOHP) air-preheater for energy thrift in a dryer," Applied Energy, Elsevier, vol. 81(2), pages 198-208, June.
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    Cited by:

    1. Jiaqiang, E. & Zhao, Xiaohuan & Liu, Haili & Chen, Jianmei & Zuo, Wei & Peng, Qingguo, 2016. "Field synergy analysis for enhancing heat transfer capability of a novel narrow-tube closed oscillating heat pipe," Applied Energy, Elsevier, vol. 175(C), pages 218-228.
    2. Qu, Jian & Wang, Qian, 2013. "Experimental study on the thermal performance of vertical closed-loop oscillating heat pipes and correlation modeling," Applied Energy, Elsevier, vol. 112(C), pages 1154-1160.
    3. Zeng, M. & Du, L.X. & Liao, D. & Chu, W.X. & Wang, Q.W. & Luo, Y. & Sun, Y., 2012. "Investigation on pressure drop and heat transfer performances of plate-fin iron air preheater unit with experimental and Genetic Algorithm methods," Applied Energy, Elsevier, vol. 92(C), pages 725-732.
    4. He, Wei & Hong, Xiaoqiang & Zhao, Xudong & Zhang, Xingxing & Shen, Jinchun & Ji, Jie, 2015. "Operational performance of a novel heat pump assisted solar façade loop-heat-pipe water heating system," Applied Energy, Elsevier, vol. 146(C), pages 371-382.
    5. Han, Xiaohong & Wang, Xuehui & Zheng, Haoce & Xu, Xiangguo & Chen, Guangming, 2016. "Review of the development of pulsating heat pipe for heat dissipation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 692-709.
    6. Srimuang, W. & Amatachaya, P., 2012. "A review of the applications of heat pipe heat exchangers for heat recovery," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(6), pages 4303-4315.
    7. Ewa Zender–Świercz, 2021. "A Review of Heat Recovery in Ventilation," Energies, MDPI, vol. 14(6), pages 1-23, March.
    8. Wang, Junye, 2009. "Experimental investigation of the transient thermal performance of a bent heat pipe with grooved surface," Applied Energy, Elsevier, vol. 86(10), pages 2030-2037, October.
    9. Jouhara, Hussam & Ezzuddin, Hatem, 2013. "Thermal performance characteristics of a wraparound loop heat pipe (WLHP) charged with R134A," Energy, Elsevier, vol. 61(C), pages 128-138.

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