Case studies from Eliwell, Danfoss, Teko, SANDEN and GIZ will be presented at ATMOsphere Europe 2017 in Berlin, Germany.

The ATMOsphere Review Panel is pleased to announce the second round of case study selections for ATMOsphere Europe 2017 on 25-27 September in Berlin.

Eliwell, Danfoss, Teko, SANDEN and GIZ will discuss their innovative natural refrigerant-based technologies at the conference. 

The presentations are:

Eliwell | An efficient R290 self-contained cabinet based on pulse EEV plus a variable speed compressor by Francesco Castagna

Eliwell will present a solution which is maximizing the cabinet efficiency while taking the cost restrained. The company has developed a special algorithm which dynamically adapts the super-heating setpoint while ensuring the best efficiency and the best variable speed compressor management.

While there are solutions in the market that are combining electronic expansion valves and variable speed compressors; Eliwell believes they can get better performances with less complexity and cost. In fact this new solution is based on pulse EEV and an innovative algorithm for estimating the suction pressure. This concept will be presented with data and measured efficiency from a real self-contained cabinet under development.

Lastly an outlook on the opportunities of smart stores with CO₂ and extended heat production for thermal networks using the actual ‘not-in use’ compressor capacity is shown. Examples on cost of operation are shown based on a typical supermarket.

TEKO | ROXSTAcube integral (transcritcal CO₂-rack) by Nadine Neuberger

Due to the use of the natural refrigerant CO₂, the GWP of the ROXSTAcube integral system is 1. This system is absolutely future-proof, can be used under environmental protection conditions after 2030 and is not affected by the regulations of the F-Gas regulation. Of course, you also get system solutions with propane or F-gas refrigerants at TEKO.

SANDEN | Full store with compact and efficient CO₂ plug-in by Emilie Aubry

Sanden developed a wide range of CO₂ plug-in condensing units to cover the needs of retail stores, for both medium and low temperatures.

Air and Water cooled models offer to the food retail market efficient solutions that are based on natural and non-flammable refrigerant.

Interest in the use of hydrocarbons within commercial refrigeration and air conditioning appliances is growing, but market development is obstructed by charge size limits within product safety standards. Within EN 60335-2-40, charge size is limited by room area and unit installation height, such that it is often impossible to use sufficient refrigerant to cool a given room. Within EN 60335-2-89, charge size is limited to 150g of flammable refrigerant, whilst products in this standard typically require up to 1500g.

The behaviour of leaked refrigerants during commercial refrigeration and air conditioning use is affected by variables such as position and orientation of leak source, appliance size and airflow characteristics, and room size and congestion. A number of measures have been proposed for revised product standards under IEC SC61C WG4 for IEC 60335-2-89 and IEC SC 61D WG16 for IEC 60335-2-40, subject to parallel vote at CENELEC level.