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Experimental evaluation of a small-capacity, direct-fired ammonia-water absorption chiller.

Number: pap. 2273

Author(s) : GOYAL A., STAEDTER M. A., HOYSALL D. C., et al.

Summary

This paper presents the results from an experimental evaluation of a small-scale, direct-fired ammonia-water absorption chiller. The absorption cycle is thermally driven using the waste heat from diesel generator exhaust. The absorber and condenser are directly-coupled to the ambient air. A novel design for the desorber component is presented. The remaining heat exchange components of the absorption cycle are packaged in a compact monolithic structure and utilize microchannel geometries for enhancing heat transfer. The system is designed to deliver 2.71 kW of cooling at extreme ambient temperature conditions of 51.7°C. The design coefficient of performance (COP) for the system based on the cooling duty and the desorber heat input rate is 0.55. A steady-state cycle model is developed to specify the inlet and outlet state points for various components. Experiments on a heat pump breadboard system are conducted at ambient conditions of 29.7 - 44.2°C, with delivered cooling duties of 2.54 kW to 1.91 kW. The performance of the system and individual components is analyzed and compared with cycle model predictions. The
absorber was identified to be the limiting component in the cycle. Other limitations in the system are identified and the deviations from the model results are explained. Effects of variation in ambient temperature are studied to characterize the operation of the system at off-design conditions.

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Pages: 11

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Details

  • Original title: Experimental evaluation of a small-capacity, direct-fired ammonia-water absorption chiller.
  • Record ID : 30018864
  • Languages: English
  • Source: 2016 Purdue Conferences. 16th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2016/07/11

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