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Novel working fluid pair of methanol/betaine-urea for absorption refrigeration system driven by low-temperature heat sources

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Listed:
  • Bao, Yangzheng
  • Zhong, Yongbin
  • Yang, Jin
  • Tang, Siyang
  • Zhong, Shan
  • Feng, Wenqian
  • Ji, Junyi
  • Li, Hongjiao
  • Liang, Bin

Abstract

An absorption refrigeration system (ARS) designed for low-temperature heat sources like industrial waste heat, solar-heated water, or geothermal heat can offer substantial energy-saving benefits. This study explores a novel working fluid pair comprising methanol and betaine-urea (BE-UR), forming a deep eutectic solvent (DES) system. This design capitalizes on methanol's high enthalpy of vaporization, the low heat capacity of the working pair, and the appropriate intensity and strength of the hydrogen bonding network within the solution. The proposed fluid pair shows full solubility of BE-UR in methanol at a mole ratio of 1.81 to 1 (methanol to BE-UR), with an equilibrium vapor pressure dropping to 8.59 kPa at 303.15 K. Molecular dynamics simulations unveil a microscale solution structure, showcasing a hydrogen bond network and unbonded methanol in the concentrated working fluid pair. This configuration enhances the absorption process of methanol vapor in the ARS absorption unit. Aspen Plus simulations predict a coefficient of performance (COP) exceeding 0.85, comparable to H2O/LiBr in single effect-ARS and outperforming NH3/H2O in SE-ARS by approximately 30 %, while maintaining a lower cycle ratio of about 2.

Suggested Citation

  • Bao, Yangzheng & Zhong, Yongbin & Yang, Jin & Tang, Siyang & Zhong, Shan & Feng, Wenqian & Ji, Junyi & Li, Hongjiao & Liang, Bin, 2024. "Novel working fluid pair of methanol/betaine-urea for absorption refrigeration system driven by low-temperature heat sources," Energy, Elsevier, vol. 298(C).
    • Handle: RePEc:eee:energy:v:298:y:2024:i:c:s0360544224009964
    DOI: 10.1016/j.energy.2024.131223
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    References listed on IDEAS

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