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First operating experiences with novel resorption chillers to generate cooling from waste heat and biomass.

Number: pap. n. 263

Author(s) : HELLE K., WEIMER T., MORSCHEL M., et al.

Summary

Most of the cooling units are electrically driven compression chillers. Besides having a poor total energy balance, they cause a great stress to the power network in summer. A good alternative are cooling units using heat as driving force. Here a thermal driven ammonia based resorption process with reduced system pressure is investigated. Resorption chillers consist of two solvent loops which are coupled by an exchange of gaseous refrigerant medium. Due to this resorption principle of an ammonia based absorption chiller, a rectification of the gas is no longer necessary. The use of compact components allows for compact chillers which are able to generate cooling temperatures below 0°C as well. For the first time it’s possible to realise cost-efficient chillers working in a lowcapacity range with thermal operating power. First experimental experiences with two resorption chillers are related to a small resorption plant with a maximum cooling capacity of 2 kW at IUTA e.V. and a resorption chiller in combination with a FLOX burner for liquid (bio-)fuels. The small resorption chiller operates with the waste heat of a HT-PEM fuel cell, the other one with a new type of high temperature boiler equipped with a liquid fuel FLOX-burner. This system is able to produce heating and cooling energy. In spite of the low capacity range the 2 kW-resorption chiller makes COP > 0.4 possible, whereas the other chiller achieves COP over 0.5. The experimental set-up of the two applications, the results of the first experiments and promising applications will be presented.

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Pages: 8 p.

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Details

  • Original title: First operating experiences with novel resorption chillers to generate cooling from waste heat and biomass.
  • Record ID : 30004633
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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