Compensation of airflow maldistribution in fin-and-tube evaporators

Publication: ResearchArticle in proceedings – Annual report year: 2012

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Compensation of airflow maldistribution in fin-and tube evaporators for residential air-conditioning is investigated with regards to circuitry design and control of individual channel superheats. In particularly, the interlaced and the face split circuitry designs are compared numerically using a linear velocity profile and a CFD predicted velocity profile obtained from Kærn (2011d) in dry and wet conditions. The circuitry models are validated experimentally in wet conditions, and for this purpose a test case interlaced evaporator (17.58 kW) was reconstructed in order to become a face split evaporator by modifying its U-bend connections. Furthermore, a 14% and 28% blockage of the face split evaporator is studied experimentally with control of individual channel superheats. It is shown that the face split circuitry with compensation gives the best performance in both dry and wet conditions, however with lower gains in wet conditions (around 3% in cooling capacity and 7-9% in UA-value). This performance gain in cooling capacity is below the uncertainty in standard experiments, however the gain may be revealed and/or validated by the possible area savings experimentally, i.e. in terms of overall UA-value.
Original languageEnglish
Title of host publicationProceedings of the 14th International Refrigeration and Air Conditioning Conference
Number of pages9
Publication date2012
PagesPaper 2178
StatePublished

Conference

Conference14th International Refrigeration and Air Conditioning Conference
CountryUnited States
CityWest Lafayette,IN
Period16/07/1219/07/12

Keywords

  • Evaporator, Maldistribution, Compensation, Modeling, Modelica
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