The 16 May monthly technical meeting of SAIRAC Johannesburg saw presenters from Ziehl-Abegg address members and guests about retrofitting fans to optimise efficiency.

Robert Fox, the South African Institute of Refrigeration and Air Conditioning (SAIRAC) Johannesburg centre vice chairman welcomed everyone to the evening’s technical talk, where he shared information about the upcoming Dreosti Memorial lectures. Certificates for courses and new members were handed out.

Once all the formalities had been completed, Fox introduced Marius du Plessis and George Oosthuizen from Ziehl-Abegg to present their technical talk.
Du Plessis spoke about retrofitting, particularly about why you would need to retrofit, looking at Key
Performance Indicators (KPIs) to detail its benefits.

He also addressed fan efficiencies, especially the importance of looking at the whole system and not just at one component of the system. Du Plessis spoke about retrofitting with Ziehl-Abegg range of plug fans, installation guidelines for plug fans, how the housing size impacts on the performance of plug fans and the failures if incorrectly installed. He also spoke about multiple fan arrangements and the new ZAcube module.

His presentation also looked at retrofitting axial fans with Ziehl-Abegg’s range of axial fans, and the fact that Ziehl-Abegg’s engineers were inspired by nature to develop a “bionic blade design” for an efficient impellor and with a composite housing to come up with an innovative axial fan system. He then moved onto project case studies that realised energy savings when retrofitting fans with Ziehl-Abegg range of fans.

At the end of the talk, SAIRAC’s Gareth Channer thanked the speakers for the presentation, whereafter everyone enjoyed some light refreshments.