Multi-scale study of coated heat exchanger in refrigeration systems

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Context

 

The trend in refrigeration systems is to get more and more efficient devices  , to reach higher performance while decreasing their consumption. Each of the component should then be enhanced. The project here focuses on heat exchangers dealing with humid air and thus subject to frost. This is here illustrated with the evaporator of an air-air or air-water heat pump.
Because of the low evaporation temperature of the refrigerant, humidity present in the air can deposit on the heat exchanger surface as liquid condensates or frost. The frost leads to an increase of pressure drops, decrease of heat exchange and should be avoided to keep decent performance.
One way to delay the frost apparition is to modify the surface energy of the exchanger surface by applying a hydrophobic coating. This technique has shown encouraging experimental results. But till date, no macroscopic model has been implemented to predict and design those specific exchangers. The goal of this project, founded by FRS-FNRS via a FRIA grant, is then to understand the physics at the surface level and use this knowledge at a higher scale by the means of numerical and experimental methods.

Objectives

 

  • Develop an open-source global simulation model of heat exchanger under frost conditions, accounting for the type of surface involved (hydrophilic-hydrophobic-superhydrophobic). It will be built from different submodels dealing with more fundamental aspects;
  • Validate and calibrate the models experimentally, at different scales:

- Frost accretion on simple geometries, to understand what happens at the surface scale;
- Highly instrumented heat pump test bench with different evaporators tested;

 

Partners

 

FNRS-FRS – FRIA grant

Publications


 

Contact

a.parthoens-at-uliege.be

 

Untitled document

BRICKER aims to develop a retrofitting solution package for existing public-owned non-residential buildings in order to achieve a drastic reduction of the energy consumption (beyond 50%) and GHG emissions in this sector. 

This retrofitting package is based on:

  • Envelope retrofitting solutions for demand reduction through made-to-measure façades, innovative insulation materials and high performance windows.
  • Zero emissions energy production technologies based on a cogeneration system fed with locally available and clean renewable sources.
  • Integration and operation strategies´ development for the BRICKER Technologies and guidance for design, commissioning and maintenance.

The retrofitting solution package will be implemented in three real demonstration multi-buildings complexes, located in different climate conditions in three different European Countries and with different end-uses: Sanitary, Educational and Administrative.

To maximize impact and replicability of the project, technologies´ integration, guidance for implementation and technological transfer to Social Housing will be developed. These should help public bodies on implementation of optimal building retrofitting strategies, taking into account economic and financial aspects in the framework of limited access to funding, breakthroughs and innovative business models and continuous operation strategies during renovation.

- See more at: http://bricker.imginternet.it/Project/Overall_Objective.kl#sthash.syOIdod0.dpuf

BRICKER aims to develop a retrofitting solution package for existing public-owned non-residential buildings in order to achieve a drastic reduction of the energy consumption (beyond 50%) and GHG emissions in this sector. 

This retrofitting package is based on:

  • Envelope retrofitting solutions for demand reduction through made-to-measure façades, innovative insulation materials and high performance windows.
  • Zero emissions energy production technologies based on a cogeneration system fed with locally available and clean renewable sources.
  • Integration and operation strategies´ development for the BRICKER Technologies and guidance for design, commissioning and maintenance.

The retrofitting solution package will be implemented in three real demonstration multi-buildings complexes, located in different climate conditions in three different European Countries and with different end-uses: Sanitary, Educational and Administrative.

To maximize impact and replicability of the project, technologies´ integration, guidance for implementation and technological transfer to Social Housing will be developed. These should help public bodies on implementation of optimal building retrofitting strategies, taking into account economic and financial aspects in the framework of limited access to funding, breakthroughs and innovative business models and continuous operation strategies during renovation.

- See more at: http://bricker.imginternet.it/Project/Overall_Objective.kl#sthash.syOIdod0.dpuf

BRICKER aims to develop a retrofitting solution package for existing public-owned non-residential buildings in order to achieve a drastic reduction of the energy consumption (beyond 50%) and GHG emissions in this sector. 

This retrofitting package is based on:

  • Envelope retrofitting solutions for demand reduction through made-to-measure façades, innovative insulation materials and high performance windows.
  • Zero emissions energy production technologies based on a cogeneration system fed with locally available and clean renewable sources.
  • Integration and operation strategies´ development for the BRICKER Technologies and guidance for design, commissioning and maintenance.

The retrofitting solution package will be implemented in three real demonstration multi-buildings complexes, located in different climate conditions in three different European Countries and with different end-uses: Sanitary, Educational and Administrative.

To maximize impact and replicability of the project, technologies´ integration, guidance for implementation and technological transfer to Social Housing will be developed. These should help public bodies on implementation of optimal building retrofitting strategies, taking into account economic and financial aspects in the framework of limited access to funding, breakthroughs and innovative business models and continuous operation strategies during renovation.

- See more at: http://bricker.imginternet.it/Project/Overall_Objective.kl#sthash.syOIdod0.dpuf

BRICKER aims to develop a retrofitting solution package for existing public-owned non-residential buildings in order to achieve a drastic reduction of the energy consumption (beyond 50%) and GHG emissions in this sector. 

This retrofitting package is based on:

  • Envelope retrofitting solutions for demand reduction through made-to-measure façades, innovative insulation materials and high performance windows.
  • Zero emissions energy production technologies based on a cogeneration system fed with locally available and clean renewable sources.
  • Integration and operation strategies´ development for the BRICKER Technologies and guidance for design, commissioning and maintenance.

The retrofitting solution package will be implemented in three real demonstration multi-buildings complexes, located in different climate conditions in three different European Countries and with different end-uses: Sanitary, Educational and Administrative.

To maximize impact and replicability of the project, technologies´ integration, guidance for implementation and technological transfer to Social Housing will be developed. These should help public bodies on implementation of optimal building retrofitting strategies, taking into account economic and financial aspects in the framework of limited access to funding, breakthroughs and innovative business models and continuous operation strategies during renovation.

- See more at: http://bricker.imginternet.it/Project/Overall_Objective.kl#sthash.syOIdod0.dpuf


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