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Absorption cycle for combined heat recovery of exhaust gases and jacket cooling of diesel engines.

Author(s) : BOUAZZAOUI S., INFANTE FERREIRA C. A., LANGRECK J., et al.

Summary

Diesel engines on board of fishing trawlers produce significant quantities of heat. About 20% of the fuel energy is recoverable from the exhaust gases at temperatures of 320 to 400°C and about 30% of the fuel energy is recoverable from the jacket coolant system at a temperature level of 75 to 100°C. On board of fishing vessels there is a need for refrigeration. Rapid freezing requires low evaporating temperatures in the equipment used, generally plate freezers and air coolers in the related freezing stores. The evaporating temperature can then be as low as -50°C. At this evaporating temperature and heat rejection to the sea water, single stage absorption cycles can only be driven by the hot exhaust gases and have very low COPs. The paper investigates the possibilities of a two stage absorption resorption cycle to make optimal use of the recoverable heat available at the two different temperature levels. The paper gives a comparison between model results for the cooling capacity obtainable under different operating conditions for both single and two stage cycles. The two-stage option delivers approximately a 25% larger cooling capacity.

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Pages: 2008-2

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Details

  • Original title: Absorption cycle for combined heat recovery of exhaust gases and jacket cooling of diesel engines.
  • Record ID : 2009-0399
  • Languages: English
  • Source: 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Publication date: 2008/09/07

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