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Impact of porous copper coating on capillary-assisted low pressure evaporator for an adsorption chiller.

Number: AD-YR2-1012

Author(s) : CHEPPUDIRA THIMMAIAH P., HUTTEMA W., BAHRAMI M.

Summary

Developing a compact low pressure (LP) evaporator with a high overall heat transfer coefficient will have a significant effect in enhancing the performance of adsorption chillers. In an LP evaporator, the operating pressure of the refrigerant (water) is low (~1 kPa) and the performance of a flooded evaporator is negatively affected by the saturation pressure difference along the height of the water column. To resolve this issue, we designed a new capillary assisted low pressure evaporator (CALPE) and performed comprehensive experimental studies to investigate the performance of the CALPE. The results showed that the external thermal resistance on the outside of the evaporator tubes accounts for up to 60% of the overall thermal resistance in the LP evaporator.
To reduce the external thermal resistance the outside surface of the evaporator tubes was coated with highlyporous open-cell copper metalfoam. The overall heat transfer coefficient of the coated CALPE increased by 1.4 times and the cooling power by 2 times.

Details

  • Original title: Impact of porous copper coating on capillary-assisted low pressure evaporator for an adsorption chiller.
  • Record ID : 30023091
  • Languages: English
  • Source: International sorption heat pump conference, ISHPC 2017, Tokyo august 7-10.
  • Publication date: 2017/08/07

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