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Combined evaporator and condenser for sorption cooling systems: A steady-state performance analysis

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  • Abadi, G. Bamorovat
  • Bahrami, Majid

Abstract

The main obstacles that prevent wide commercialization of sorption cooling/heat pump systems are their bulky size (weight), cost, and low efficiency. Combining two main cycle components, namely, evaporator and condenser, is a potential solution that can reduce the complexity, mass, and cost of such systems. Capillary-assisted low-pressure evaporators (CALPEs) are used in closed-cycle sorption systems including heat pumps, heat transformers, desalination, and thermal energy storage systems. This paper investigates the feasibility of a combined evaporator and condenser (CEC). A custom-built testbed for evaluating performance of CEC is used to test four types of commercially available finned-tube heat exchangers with a range of fin geometries. Tests were performed with water vapor pressure of 0.61–5.63 kPa and 0–35 °C heat transfer fluid (HTF) inlet temperature. Comparing tubes with different fins indicates that tubes with 1.42 mm parallel fins, 40 fins per inch (FPI), have a higher overall heat transfer coefficient as an evaporator (40 W/K) and those with 0.9 mm cross head fins (40 FPI) marginally outperformed the other tubes as a condenser (47 W/K). Therefore, the capacity of the custom-built CEC is reported within practical operating temperature range.

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  • Abadi, G. Bamorovat & Bahrami, Majid, 2020. "Combined evaporator and condenser for sorption cooling systems: A steady-state performance analysis," Energy, Elsevier, vol. 209(C).
    • Handle: RePEc:eee:energy:v:209:y:2020:i:c:s0360544220316121
    DOI: 10.1016/j.energy.2020.118504
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    References listed on IDEAS

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    1. Sabir, H. M. & Bwalya, A. C., 2002. "Experimental study of capillary-assisted water evaporators for vapour-absorption systems," Applied Energy, Elsevier, vol. 71(1), pages 45-57, January.
    2. 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.
    3. Askalany, Ahmed A. & Salem, M. & Ismael, I.M. & Ali, A.H.H. & Morsy, M.G. & Saha, Bidyut B., 2013. "An overview on adsorption pairs for cooling," Renewable and Sustainable Energy Reviews, Elsevier, vol. 19(C), pages 565-572.
    4. Cheppudira Thimmaiah, Poovanna & Sharafian, Amir & Huttema, Wendell & McCague, Claire & Bahrami, Majid, 2016. "Effects of capillary-assisted tubes with different fin geometries on the performance of a low-operating pressure evaporator for adsorption cooling system applications," Applied Energy, Elsevier, vol. 171(C), pages 256-265.
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