During the February technical talks, the South African Institute of Refrigeration and Air Conditioning (SAIRAC)’s Johannesburg and KwaZulu-Natal centres looked at all things CO2 and the potential of this natural refrigerant.
The monthly technical talk was presented by Marius La Grange of Energy Partners Refrigeration Solutions, who is also the current SAIRAC national president.
Marius La Grange doing the talk for the Johannesburg centre.
Image credit: SAIRAC
The initial talk took place in Cape Town in October last year already and was such a hit, that the other SAIRAC centres requested a repeat of the talk for their regions too. Port Elizabeth followed with a talk in October while the remaining two centres (KwaZulu-Natal and Johannesburg) tackled this topic in February.
The KZN centre talk on 7 February was very well attended and, according to SAIRAC, the members found it very informative.
The Johannesburg SAIRAC centre held it’s talk on 21 February. Jaco Pieterse, Johannesburg centre chairman, welcomed everyone to the evenings technical talk, where he shared upcoming events and courses on the calendar. Certificates for courses and new members were also handed out, as usual and Grant Laidlaw, past president and national treasurer, spoke about the upcoming Dreosti Memorial Lecture. He also spoke about the upcoming conference on natural refrigerants to be held in Cape Town in June.
All about CO2
In ‘Part 1: CO2 as refrigerant’, La Grange spoke about the classification of refrigerants, the Ozone Depletion Potential (ODP) and the Ozone Warming Potential (GWP) of various refrigerants and about chlorine which causes ozone depletion.
He also discussed calculating of the Total Equivalent Warming Impact (TEWI) for installations; and the Life Cycle Climate Performance (LCCP) approach. According to La Grange, multiple perspectives are required to get a holistic view for a CO2 installation.
A brief history was given on refrigerants, in particularly on CO2, the early systems and where they were used, the current trends for CO2, the driving forces to reintroduce CO2 as a refrigerant and the safety considerations when using CO2.
The Johannesburg talk was attended by industry experts.
Image credit: SAIRAC
At the end of Part 1, La Grange noted that a free book on natural refrigerants could be downloaded from the GIZ website.
In ‘Part 2: Applications’, La Grange tackled the factors to consider for cascade systems and trans-critical booster type systems. He also spoke about installation guidelines, as well as the start-up and charging of the system. La Grange spoke about the design considerations for these systems and about the recent development of parallel compression.
La Grange advised looking at the Coefficient of Performance (COP) for the whole system.
After the talk and a Q&A session, refreshments and snacks were served.
Visit: www.sairac.co.za to find out when the technical talks are,
which are scheduled each month, at one of the four centres near you. The talks, free for both members and guests, are a great way to stay abreast of what’s happening in the HVAC&R industry and to network with peers.