We are proud to announce that we have selected the final 6 Technology Case Study Presentations to be given at ATMOsphere America 2012!

Below you will find a short summary of the case studies selected:

• Global Technology Trends and Development in CO₂ by Michael Englebright, Danfoss: This presentation will provide an historical overview of CO₂ global technology developments during the past decade, closely examining the technology advances, implementation and adoption in the global industrial refrigeration and food retail segments. A specific overview of CO₂ systems in North America will be depicted showing a current case study of the first trans-critical CO₂ booster system installed in the US. The presentation will cover design benefits, system challenges, efficiency thresholds compared to other refrigerants, and will conclude with an outlook for how the North America market can overcome adoption barriers - specifically training and capital costs constraints.

• Innovation in low charge, packaged ammonia refrigeration systems for temperature controlled storage and HVAC applications by Rob Lamb, Star Refrigeration: Star’s case studies about low charge, high efficiency packaged ammonia cooling solutions for three different applications will demonstrate the viability and operational benefits of this ammonia technology applicable to the North American market. ‘Critical charge’ system designs have reduced ammonia charges in excess of 80%. The use of inverted technology and developments in heat exchanger technology have ensured efficiencies match and surpass those of traditional pumped circulation and flooded solutions. The presentation will show best practice using case studies relevant for the North American market.

• Propane Compressors for Light Commercial Refrigeration Segment in US Market by Embraco: Propane can be considered as the most interesting refrigerant both for low evaporating temperature field as well as for positive temperature evaporation appliances. Recent EPA SNAP positive conclusion opens opportunity in US household and light commercial refrigeration applications. Comparative analysis of different types of propane applications will be presented in this presentation, including a performance testing (R290 vs R404A) of a Ben &Jerry freezer produced by IARP for Unilever field test in US with an Embraco compressor as well as a comparative performance testing (R290 vs R404A) of True Manufacturing appliance for US market and more.

• 
Products innovations in the field of natural refrigerants for North America, by Marc-André Lesmerises, Carnot: The presentation will highlight results of two recent projects. The first project will show a highly efficient ammonia/CO₂ system in a distribution center with reduced refrigerant charge and low system cost. Efficiency numbers, cost and general results will be presented. The second project together with leading Canadian supermarket retailer Sobeys will demonstrate how to introduce leading edge CO₂ as primary fluid technologies and practices for refrigeration system design and operation. This presentation will show the real energy consumption data and the potential the systems have for other stores in North America.

• Latest Ultra Low Charge Ammonia Shell and Tube Evaporator by Zahid Ayub, Isotherm: The paper will show results from a low charge ammonia evaporator that has been developed to cool process fluid on the tube side. Ammonia is expanded on the shell side. The evaporator incorporates multi-stage distribution mechanism that results in even distribution of refrigeration along the bundle height resulting in thin film evaporation. The first commercial unit was installed on board a commercial fishing vessel in Chile. The chiller was designed for a capacity of 385 kW and the total refrigerant charge in the system is less than 18 kg. With several other projects in the commissioning phase, he will explain the strong relevance for the North America with the goal to reduce the ammonia charge to extreme minimum so the safety issue will be scaled down.

• Safe ammonia system design in various applications, by Alexander Cohr Pachai, Johnson Controls: This paper is about a selected number of installations using different natural refrigerant solutions in different applications in the US including an ice cream factory that has been equipped by JCI. It uses 80 tons of ammonia in the new installation and 30 tons in the old part of the buildings located close to a residential area. Another application presented will highlight results of using new equipment in a cascade system.