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A new ammonia/lithium nitrate absorption chiller for solar cooling applications.

Author(s) : ZAMORA M., BOUROUIS M., VALLÈS M., et al.

Summary

The ammonia/lithium nitrate mixture has been proposed in the open literature as a suitable pair for absorption cooling systems driven by low-temperature heat sources, which makes it an interesting option for residential solar cooling applications using flat panels. This working pair presents a lower risk of crystallization than water/lithium bromide at high temperatures in the absorber and condenser, allowing safety operation of the chiller at high heat rejection temperatures. This is essential for hot climates such as the Mediterranean in which high solar radiation and high cooling demand are coincident at the same daily hour with high ambient temperatures. A new small capacity absorption chiller prototype using ammonia/lithium nitrate as the working mixture has been designed at the Rovira i Virgili University in Tarragona (Spain). A water-cooled and an air-cooled compact prototypes have been manufactured and tested in a test bench. A patent has been applied for the configuration of the new absorption chiller using brazed plate heat exchangers in the main components and ammonia/lithium nitrate as the working fluid together with a new design of the solution distributor in the absorber and the integration of a finned tube heat exchanger dry-cooler for the condenser and absorber heat rejection. This paper reports the cooling capacity and COP measurements in the test bench of both prototypes under the following test conditions: medium heat rejection temperature between 30 and 41ºC, chilled water temperature of 8 and 15°C, and driving hot water temperature at 85, 90 and 95°C.

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Pages: 8 p.

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Details

  • Original title: A new ammonia/lithium nitrate absorption chiller for solar cooling applications.
  • Record ID : 30002754
  • Languages: English
  • Source: 4th Conference on Ammonia Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 14-16, 2011.
  • Publication date: 2011/04/14

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