It was clear at ATMOEurope 2015 that suppliers and end users alike are already charting new territory in order to maximise overall system and building energy efficiency. Integrated CO2 refrigeration systems for CVS layouts from Carel and EPTA Deutschland, CO2 condensing units and the need to scale down solutions for smaller formats were all on topic.
“The key factors for the convenience stores are the integration of the components of the systems – from refrigeration to air conditioning to lighting,” said the company’s CO2 retail specialist Nicola Pieretti.
“There is a 96% refrigerant leak reduction and this seems to be a very high number, but it is the reality because we are moving from multiplex systems, where the average leakage rate is about 10-15%, to integrated cabinets where the cabinets are made and tested in the factory, so the leakage rate is reduced to about 1%, with a charge reduction of 80%.”
“The originality of Sanden is that we are making our own key devices; compressors or heat exchangers. In order to accelerate this transition, and not just say, ‘we’re going all CO2’ we took the decision last year to open a new office. We are not only talking about distributing products but defining the market by coming up with innovative product plans for the next years,” Gillaux said.
“Are we missing the best opportunity to get the most out of these systems?” Hansen asked. “Do we include heating in the equation? Yes, we do care about energy efficiency, especially when we’re here and then we forget about it a little bit at home. There is room for more integrated solutions, you will save money and you will save energy if you work at it. We have seen no real good comparisons of real life integrated systems with COPs or about how simple can we make the whole building system; how can we integrate out energy solutions. I think we’re missing a great opportunity,” he said.
“The system is currently in operation in Central Europe, but this concept is applicable and beneficial everywhere within the CO2 equator. Conventional systems are currently being monitored but what we have already seen is that this system, the Clima is green, is competitive, efficient and cost saving for supermarkets and hypermarkets,” Görner said.
“The first generation CDU exceeds Ecodesign requirements, but we can improve, I believe we have the ability to match best in class. We need the (market) pressure to produce more efficient systems.”
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