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IIR document

Design optimization of NH3 evaporators for heat pumps in district heating.

Number: 0037

Author(s) : FILIPPINI S., MERLO U., DEMURTAS D., MACCHI E.

Summary

Efficient district heating and cooling (DHC) systems can play a key role in achieving the objectives of the European Union. District heating systems contribute substantially to the reduction of primary energy supplies, carbon emissions and costs.
Heat pumps are key system components when it comes to providing sustainable heat and integration of energy systems in a climate-friendly future. Heat pumps allow the use of various accessible heat sources such as ambient air, seawater, groundwater or waste heat from the industry.
Currently, the use of heat pumps for district heating is in a critical phase. Efficiency and reliability are key to the diffusion of these systems on a larger scale.
LU-VE participated from the beginning in the development of specific large air evaporators for district heating application, using NH3 as working fluid.
The paper describes in the first part the main issue characterizing the design of a large field of evaporators for heat pump application in district heating plants.
The second part of the paper illustrates the R&D activity that enables the latest product evolution, capable of lowering the energy consumption of the evaporators by 21%.
A new ventilation concept has been developed and dedicated experimental tests have been performed in order to validate the design. Air distribution has been improved as well as the aerodynamic configuration of the ventilation housing.

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Pages: 10 p.

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Details

  • Original title: Design optimization of NH3 evaporators for heat pumps in district heating.
  • Record ID : 30029671
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0037
  • Document available for consultation in the library of the IIR headquarters only.

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