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Experimental study on the effects of the operation conditions on the performance of a chemisorption air conditioner powered by low grade heat

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  • Kiplagat, J.K.
  • Wang, R.Z.
  • Oliveira, R.G.
  • Li, T.X.
  • Liang, M.

Abstract

A chemisorption air conditioner with NaBr/expanded graphite composite sorbent and NH3 as refrigerant was designed and constructed to be powered by low temperature heat. The effect of independent variables (chilled water inlet temperature, heat source temperature and cycle time) on the coefficient of performance (COP) and cooling power of the machine was investigated with a 2k factorial design experimental set-up. This set-up was extended according to a central composite design to identify the coefficients of a 2° order polynomial equation that related the performance of the system and the independent variables. This equation was used to create response surfaces that enabled the identification of the operation conditions that maximized the machine performance. The experimental results indicated that the machine had a cooling power between 1.27 and 3.16kW and a COP ranging from 0.28 to 0.48, depending on the operation conditions. The response surface analysis showed that when the heat sink was 25±1°C the maximization of the cooling power occurred at a driving heat source of at least 71°C, in cycles not longer than 21min. Contrarily, the maximization of the COP occurred at cycle time above 77min, and heat source of around 56°C. For simultaneous maximization of both the COP and the cooling power, the heat source should be 56°C, and the cycle time between 20 and 25min.

Suggested Citation

  • Kiplagat, J.K. & Wang, R.Z. & Oliveira, R.G. & Li, T.X. & Liang, M., 2013. "Experimental study on the effects of the operation conditions on the performance of a chemisorption air conditioner powered by low grade heat," Applied Energy, Elsevier, vol. 103(C), pages 571-580.
    • Handle: RePEc:eee:appene:v:103:y:2013:i:c:p:571-580
    DOI: 10.1016/j.apenergy.2012.10.025
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    References listed on IDEAS

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    1. Oliveira, R.G. & Wang, R.Z. & Kiplagat, J.K. & Wang, C.Y., 2009. "Novel composite sorbent for resorption systems and for chemisorption air conditioners driven by low generation temperature," Renewable Energy, Elsevier, vol. 34(12), pages 2757-2764.
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    1. de Oliveira, Rogério Gomes & Generoso, Daniel João, 2016. "Influence of the operational conditions on the performance of a chemisorption chiller driven by hot water between 65°C and 80°C," Applied Energy, Elsevier, vol. 162(C), pages 257-265.
    2. Sultan, Muhammad & El-Sharkawy, Ibrahim I. & Miyazaki, Takahiko & Saha, Bidyut Baran & Koyama, Shigeru, 2015. "An overview of solid desiccant dehumidification and air conditioning systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 46(C), pages 16-29.
    3. Sharafian, Amir & Nemati Mehr, Seyyed Mahdi & Thimmaiah, Poovanna Cheppudira & Huttema, Wendell & Bahrami, Majid, 2016. "Effects of adsorbent mass and number of adsorber beds on the performance of a waste heat-driven adsorption cooling system for vehicle air conditioning applications," Energy, Elsevier, vol. 112(C), pages 481-493.
    4. Hamdy, Mohamed & Askalany, Ahmed A. & Harby, K. & Kora, Nader, 2015. "An overview on adsorption cooling systems powered by waste heat from internal combustion engine," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 1223-1234.

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