Page 40

40

Events

heart of the system. The pumped CO 2 provides the condensing medium for the subcritical DX frozen food system. We’ve got CO 2 for frozen, pumped CO 2 for the chilled, and ammonia to keep the CO 2 at the required temperature,” Arrowsmith said. A key reason for opting for this type of system was the high coefficient of performance (COP) of 4.0. “The increased cost of this system was recovered within half a year on paper,” Arrowsmith said. Similarly, in Profroid’s experience CO 2 and ammonia together provide the best solution, according to Pondicq-Cassou. Comparing an ammonia system with an ammonia-CO 2 system, Profroid found the latter to offer the best combination of efficiency, safety and investment cost.

Technology training is crucial

For us, natural refrigerants are a no-brainer for industrial. – Eric Delforge, Mayekawa

use only one refrigerant. They did not want to handle many refrigerants [and] they wanted a future-proof, easy-to-handle refrigerant. CO 2 was the optimal option,” said Schönenberger.

Though Europe’s commercial and industrial sectors are both moving away from HFCs, low-GWP refrigerants will need to be utilised across the full HVAC&R spectrum to achieve the phase-down objectives under the EU’s F-Gas Regulation. On 1 January 2018, the HFC quota under the F-Gas Regulation will fall to 63% of the 2015 baseline (which refers to the total quantity placed on the market in the period 2009-2012). The anticipated shortage has already led to price hikes for the most commonly used HFCs, such as R404A and R407. Arno Kaschl from the European Commission’s climate action department told ATMOsphere Europe

As technology develops, the ammonia charge can be reduced, thereby improving system safety, pointed out Wolfgang Dietrich, product manager (chillers) at GEA Refrigeration Germany. The combination of CO 2 and ammonia in an NH 3 -CO 2 cascade system appeals to Nicolas Pondicq-Cassou, director of engineering – mechanical systems at Profroid (a Carrier brand), and Paul Arrowsmith, refrigeration design manager at UK retailer Sainsbury's. At its new online fulfilment centre in east London, Sainsbury’s decided to go for an ammonia-CO 2 cascade refrigeration system from GEA. “It’s pumped CO 2 for the chilled [products], cascaded from an ammonia system which keeps the pumped CO 2 at -6°C,” Arrowsmith said. No ammonia circulates on site. Instead, it is restricted to the plant room, the evaporator and the evaporative condensers. “The liquid CO 2 is the

Jonas Schönenberger, Frigo-Consulting

Accelerate Europe

Winter 2017

Accelerate Europe #9 Winter 2017  

HONOURING THE TRAILBLAZERS The past twelve months have been full of innovation in the HVAC&R sector. The winter 2017 edition of Accelerate...

Accelerate Europe #9 Winter 2017  

HONOURING THE TRAILBLAZERS The past twelve months have been full of innovation in the HVAC&R sector. The winter 2017 edition of Accelerate...