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12h15 – 13h00
13h00 – 13h45
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Cooling as a Service( case studies and success stories)
Improvement of ammonia refrigeration systems
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With the rapid increase in global energy costs and the pressure to reduce carbon emissions, designers are constantly seeking new ways to improve the energy efficiency of refrigeration systems. Traditional two-stage ammonia systems already provide excellent efficiency in low-temperature applications, but this could be improved if ambient heat sinks are utilized.
The high discharge temperatures of ammonia booster compressors provide an opportunity to reject heat directly to the atmosphere. This reduces the induced load on the high-stage compressor and results in lower system power consumption. After reviewing different methods to achieve low-stage de-superheating, it was found that the use of simple evaporative condenser technology may hold the key to cost-effective improvements.
This presentation deals with the potential reduction in peak power that could be achieved by introducing a low-stage de-superheating circuit into the refrigeration system design, combined with a highpressure liquid sub-cooler. Results from a test site are included to review the performance of the evaporative condenser in a de-superheating application.
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Dawie Kriel- General Manager of Energy Partners Refrigeration. Dawie has Postgraduate qualifications in thermodynamics, air-conditioning and refrigeration with concentrated experience over the last 30 years in industrial refrigeration, drying systems, pack house, cold room and cold chain system design. In addition to the technical responsibility for all mechanical services from plumbing to rational design, Dawie has been appointed overall professional team leader for several multidisciplinary projects in the food and beverage sector. Started and successfully ran MGC Industrial projects from 2004 until 2011 when it was sold to Energy Partners. Since joining EP, I was responsible to build the Refrigeration contracting business through acquisitions and internal growth over a period of three years. Now one of the biggest refrigeration contractors in South Africa, EP Refrigeration is a world leader in outsourced cooling( CaaS) which we have developed over the last 10 years with a growing portfolio of $ 20 million in 2023. Dawie currently leads the refrigeration business as general manager reporting to the EP group CEO.
Hannes Steyn- Senior Director Divisional Representative HRT Region WEMEA | Southern & Eastern Africa – GEA. Hannes Steyn studied Mechanical Engineering at Stellenbosch University and project management at the University of Cape Town. He registered with Engineering Council of South Africa( ECSA) as a Professional Engineer in 1999 and has more than 25 years’ experience in the industry. He is an active member of the South African Institute for Refrigeration and Air Conditioning( SAIRAC) and received the SAIRAC special meritorious service award in 2020. He is also a member of the International Institute of All Natural Refrigerants. Hannes has a keen interest in Heat Pumps as well as energy optimisation and recovery in Industrial Refrigeration Systems.
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