COILS, COOLERS AND CONDENSERS
Green building thanks to integrated planning
neutral store. The building was awarded the DGNB platinum prize in the ‘retail building’ category in recognition of this high standard of building and sustainable use of material and energy resources. The transcritical CO2
The Rewe supermarket in the Norderstedt district of Schleswig-Holstein operates as a CO2
cooling
system from the company Epta uses a Güntner FLAT Vario gas cooler from the S-GVH series.
T
he REWE Group implements sustainable and energy-effi cient supermarket concepts in Germany. At the end of 2016 the company has established more than 50 green building supermarkets in accordance with DGNB (German Association for Sustainable Building) standards, and there are even more in the pipeline.
The REWE green building concept for the sustainable construction and operation of commercial real estate is based on the integrated planning of all trades. In terms of building
40 October 2017
services, the latest cooling and air conditioning, heating, ventilation and lighting technology was installed.
The around fi ve million euro supermarket building in Norderstedt has a sales fl oor area of 1,300 m², made from environmentally friendly building materials. It is particularly well insulated, and the pioneering building engineering dispenses fully with the need for fossil fuels. Further features that contribute to the positive energy footprint include the daylight architecture and the use of locally sourced, renewable energy (heat
Gas cooler
To ensure that transcritically operated CO2
refrigeration systems
achieve optimal COP ratings, there must be a control valve to regulate the pressure in the gas cooler to a constant value that is a function of its outlet temperature. Owing to the high operating pressure under which CO2
cooler is designed for a maximum operating pressure of 120 bar as standard.
To enable it to withstand these high pressures, Güntner has been using small-diameter core tubes made of high-strength copper alloy since 2015. This substantially reduces the necessary tube volume to about 40% of that in typical stainless steel core tubes. On one hand, this helps to
signifi cantly reduce the refrigerant charge needed in the plant, but it also speeds up the process of switching between subcritical and transcritical operation, because less CO2
systems operate, the gas
has to be displaced into the gas cooler. One positive side eff ect is that a smaller intermediate pressure vessel can potentially be used, because less refrigerant needs to be provided for this process.
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