Investigation of air-cooled condensers for ammonia-water absorption chillers.

Number: pap. 2270



This paper presents the results from experimental and analytical investigation of air-cooled condensers for use in small-scale, direct-fired ammonia-water absorption chillers. Two novel multi-pass tube-array condensers, compatible with ammonia-water refrigerant mixture, are designed, fabricated and evaluated. The condensers are built for an absorption system that delivers 2.71 kW cooling capacity in severe ambient temperatures as high as 52°C with a design condenser heat rejection rate of 2.51 kW into ambient air. A single-pressure ammonia-water test facility is constructed and used in conjunction with a temperature- and humidity-controlled air-handling unit to evaluate the condensers at design and off-design operating conditions. Condenser performance is recorded over a range of air temperatures, refrigerant temperatures, air volumetric flow rates, and refrigerant mass flow rates. The maximum ambient temperatures and minimum air flow rates required to reject design heat duty are identified for both the condensers. A heat transfer model is developed for the first condenser, which is determined to be air-side limited. The model
predictions are compared with the measured heat transfer rates at various ambient conditions and the deviations explained. Results from this investigation guide the development of air-coupled zeotropic mixture condensers for compact absorption heat pumps.

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  • Original title: Investigation of air-cooled condensers for ammonia-water absorption chillers.
  • Record ID : 30018865
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11


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