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Thermodynamic feasibility evaluation of hybrid dehumidification – mechanical vapour compression systems

Author

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  • Thu, K.
  • Mitra, S.
  • Saha, B.B.
  • Srinivasa Murthy, S.

Abstract

Air conditioning approach using two separate units for latent heat and sensible heat removal opens up opportunities and challenges for improved efficiency. In such systems, the dehumidification device removes moisture from the air stream usually without condensation whilst the remaining sensible load is handled by a conventional mechanical vapour compression (MVC) machine. This article investigates the thermodynamic feasibility of such hybrid dehumidifier + MVC systems as potential replacements for the conventional MVC devices. We shed some light on the minimum efficacy requirement in terms of COP or simply the breakeven COP for the coupled dehumidification system. Thermodynamic investigation has been conducted using classical Carnot, endoreversible technique and the experimental approaches. The breakeven COPs for a dehumidifier + MVC system where the latter using HFC-R14a, HFC-R32 and HFO-R1234yf as refrigerants have been investigated at assorted outdoor air ratios. Performance enhancement in terms of COP and the cooling capacity at elevated temperatures for sensible cooling are accounted for. It is observed that the breakeven COP for the dehumidification system ranges from 9 to 17 (Carnot approach) and 4.3 to 6.8 (Ideal cycle) in order to be realistically competitive with the current efficiency offered by a MVC system for the both dehumidification and sensible cooling. The life cycle cost (LCC) analysis is further performed to assess the fresh air-handling systems using a conventional MVC system and a dehumidifier + MVC system. The unprecedented improvement in the performance of the MVC systems further raises the ceiling for the breakeven COP of the dehumidification systems.

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  • Thu, K. & Mitra, S. & Saha, B.B. & Srinivasa Murthy, S., 2018. "Thermodynamic feasibility evaluation of hybrid dehumidification – mechanical vapour compression systems," Applied Energy, Elsevier, vol. 213(C), pages 31-44.
    • Handle: RePEc:eee:appene:v:213:y:2018:i:c:p:31-44
    DOI: 10.1016/j.apenergy.2018.01.024
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    Cited by:

    1. Liang, Jyun-De & Huang, Bo-Hao & Chiang, Yuan-Ching & Chen, Sih-Li, 2020. "Experimental investigation of a liquid desiccant dehumidification system integrated with shallow geothermal energy," Energy, Elsevier, vol. 191(C).
    2. Qing Cheng & Han Wang & Lin Zhu & Yao Chen, 2023. "A current efficiency model coupled with desiccant molecular weight for electrodialysis regeneration in liquid desiccant air-conditioning systems," Energy & Environment, , vol. 34(4), pages 909-926, June.
    3. Matsui, Kohei & Lin, Jie & Thu, Kyaw & Miyazaki, Takahiko, 2022. "On the performance improvement of an inverted Brayton Cycle using a regenerative heat and mass exchanger," Energy, Elsevier, vol. 249(C).
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    5. Gado, Mohamed G. & Ookawara, Shinichi & Nada, Sameh & El-Sharkawy, Ibrahim I., 2021. "Hybrid sorption-vapor compression cooling systems: A comprehensive overview," Renewable and Sustainable Energy Reviews, Elsevier, vol. 143(C).

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