We're happy to announce the second round of case studies selected to be presented at ATMO Europe 2018 conference from Carrier Commercial Refrigeration, Frigotherm Ferrari, Microgroove, Sub-Zero, MTL Cool & Heat Transfer Technologies, Sainsburys and Tewis.
The ATMOsphere Review Panel is pleased to announce the second round of case study selections for ATMOsphere Europe 2018 taking place on 19-21 November in Lago di Garda, Italy.Carrier Commercial Refrigeration, Frigotherm Ferrari, Microgroove, Sub-Zero & Heat Transfer Technologies, Sainsburys and Tewis will present their innovative natural refrigerant-based technology case studies at the conference.
The presentations are:
Carrier Commercial Refrigeration | High efficiency solutions with CO2 for warm & hot climates by Dominique Giraud
Mostly based on ejectors, the full CO2 solutions necessary to tackle the "CO2 Equator" have been introduced in the last past years. A second generation of advanced CO2 systems, based on a combination of ejectors and other means to be tailored to the applications, is now available to deliver increased efficiency all year long, achieving significant annual energy consumption savings in warm and hot climates, when facing ambient temperature up to or even greater than 40°C. These systems will help to reach the Kigali objectives anywhere in the world, including Middle East and Asia, by providing full CO2 performances greater than the non-natural solutions used so far.
Frigotherm Ferrari GmbH | Refrigeration plant with high temperature heat recovery from river water through double stage ammonia heat pump by Kilian Salutt
FRIGOTHERM FERRARI GmbH from Lana (BZ/South Tyrol, Italy) in 2015 bilt for the austrian manufacturer of snowboards CAPITA MFG / Freistritz a.d. Gail an ammonia refrigeration plant combined with a double stage heat pump operating in a complex system. In their production facilities Capita needs simultaneously warm water at two temperature levels (40°C for room heating and 75°C for the machines in the production process, totally approx. 1300 kW) and refrigeration capacity for the cooling of the product prior to machining and for cooling of the production rooms.
In order to equilibrate the balance between cold and warm energy the system uses river water to dissipate energy in excess or to deliver additional energy when needed.
MicroGroove, Sub-Zero, MTL Cool and Heat Transfer Technologies | Sub-Zero and MTL Cool optimise MicroGroove copper-tube coils for use with natural refrigerants in refrigeration equipment by Nigel Cotton, Anderson Bortoletto and Yoram Shabtay
Hydrocarbons are highly attractive for use in refrigerator and freezer applications but their flammability necessitates strict “use conditions” with respect to refrigerant charge. Sub-Zero, Inc. makes high-end, built-in residential refrigerators, freezers and wine coolers. The company used a proprietary heat exchanger design and simulation software tool from Optimized Thermal Systems to identify feasible 5-mm inner-grooved copper tube coil designs. The baseline design used 6.35-mm copper tubes. For an R600a residential application, simulations identified 5-mm tube coil designs with significantly less internal tube volume than the baseline coil. One 5-mm design reduced the internal tube volume by as much as 41 percent as compared to the baseline, along with a potential 57 percent reduction in coil footprint, while maintaining a near equal airside pressure drop. Sub-Zero is reinventing its residential appliances to allow for more efficient use of natural refrigerants using MicroGroove smaller diameter copper tubes.
Sainsburys' new state of the art frozen food storage facility at Pineham Northampton replaces existing facilities at Elstree and Stone. The facility will be a single point of supply for frozen products to all our stores so the resilience of the refrigeration system is critical. The installation features an energy efficient ammonia refrigeration system designed with the necessary resilience required by any single point of supply. Also incorporated is a CHP that provides the baseline power requirements for the facility and the rejected heat from the CHP is recovered to an Absorption chiller.
The presentation will provide an overview of the refrigeration system and the resilience and energy efficiency features that have been incorporated into the design before summarising on the predicted energy and carbon that will be achieved.
Tewis | Integration of refrigeration & air conditioning with CO2 in supermarkets by Javier Atencia Escudero
Refrigeration and air conditioning industry are currently driven by F-Gas regulation together with taxes based on GWP refrigerants value, the lack of supply and the increase in prices. This scenario gives us the possibility to develop solutions based on natural refrigerants such as CO2 to cover the needs of refrigeration and air conditioning in retail and supermarkets without forgoing the energy efficiency of the systems thanks to the synergies with complementary technologies.
These technical solutions require a deep knowledge of the refrigeration systems, an adequate risk analysis in the facilities and the implementation of new and specific controllers. The object solution is based on a CO2 transcritical booster cycle machine with climate aspiration, parallel compressor and liquid economizer for freezing services. In addition to this integration, we propose to raise the evaporation pressure for freezing, cooling and AC controlling electronically the evaporators with an SH value between 2 and 0.
