Any progress is based on new knowledge from research and development.

This is why ScanRef has introduced this opportunity to publish actual scientific papers, relevant for the refrigeration and air conditioning industry.

Further suggestions are welcome.

 

Thanks to the use of Computational Fluid Dynamics Software and extensive testing in the LU-VE laboratory, a new generation of coil geometry was developed, aimed at performing well under frost formation with proper use of the finned surface. The surface has several turbulators for perfect aerodynamic configuration. Particular attention was paid to their definitions and a micro-photographic evaluation of frost formation on finned turbulators was made clearly showing frost growth on finned surface.

This paper, presented by Stefano Filippini, U. Merlo, LU-VE SpA at IIR Conference on Ammonia Refrigeration Technology, Ohrid, 2009 describes in detail the CFD software analysis, test ring, testing activity and the results of this important development.

Download as PDF-file (588 kb).

Link to LU-VE

 

Bent Wiencke, Corporate Engineering for Nestlé USA, Inc. and Nestlé Canada, presented his Case Study of Pipework Fracture in Ammonia Systems at the 2008 IIAR Ammonia Refrigeration Conference & Exhibition, Colorado Springs, Colorado, where it was awarded for the highest score on the evaluations forms submitted by those who attended the sessions.

Please contact Bent Wiencke (bwiencke@gmail.com) for a copy of this paper.

 

By Bent Wiencke, Issaquah, WA 98029, November 8, 2008
E: bwiencke@gmail.com

Abstract: The computation of the partial and total volume of pressure vessels with various type of head profiles requires detailed knowledge of the head profile geometry. Depending on the type ofhead profile the derivation of the equations can become very complex and the calculation processcumbersome. Certain head profiles require numerical methods to obtain the partial volume,which for most application is beyond the scope of practicability. This paper suggests a uniquemethod that simplifies the calculation procedure for the various types of head profiles by usingone common set of equations without the need for numerical or complex computation methods.

For ease of use, all equations presented in this paper are summarized in a single table format for horizontal and vertical vessels.

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