CASE STUDIES
replacement of R404A, making the change safe, easy and more efficient for the technicians.
Implementation
In its bid to reduce its carbon footprint, Makro has achieved some significant goals in this store : ■ Installation of doors and lids in MT and LT cabinets. This allowed for the de- commissioning of one out of the four original central racks, as consumption was
reduced.Maintenance costs were also reduced.
■ A strong focus on refrigerant leaks at the store resulted in a significant reduction to a level of only 6%.
■ The refrigeration system has now been converted to achieve higher efficiency and a further reduced carbon footprint.
■ The original oil management system, based on Venturi effect, has been replaced by active systems with oil separators and receivers with individual control of oil through the compressor.
■ Microchannel technology was introduced via V-shaped condensers with higher efficiency and a 15% lower refrigerant charge.
■ Introduction of floating condensing and evaporating control.
■ Inverter technology has been introduced for each rack’s master compressor.
The refurbishment project took place from 23 to 27 March 2016, and involved a total crew of 60 people working on all aspects relating to refrigeration, component replacement and electrics. Catri worked shifts continuously during those days.
Refrigerated stock from the medium temperature cabinets and cold rooms was moved to a nearby Makro logistics centre, whilst the products from the low temperature cabinets and walk-in freezers were kept in
2m x 13m long refrigerated trucks.A simple adjustment of all refrigeration controls saw the expansion valves closed by one turn, with superheat settings adjusted to meet the demands of the system.
Even though the discharge temperature of R448A is very close to that of R404A, due to the extreme peak temperatures in summer Makro decided to add extra mitigation in both low and medium temperatures with ChillBooster in both condensers.
What happens next?
Makro and Catri continue to work during the coming months on system optimisation. Evaporating temperature is continuously monitored to keep it as high as possible and achieve the lowest possible energy use, with an expected level of 2%-3% savings per degree Celsius.
After the success of this store in Leganés, the Makro store in Santander, Northern Spain was also retrofitted from R404A to the HFO blend R448A in May 2016.
José María de Santos, refrigeration manager at Makro said: “N40 (R448A) performance is good and set points were achieved immediately after retrofit. We will continue to monitor and measure energy consumption for a long period to have reliable data about savings and consider them for future plans.” Rafael Matarranz, manager at Catri added: “It was a real challenge to make the conversion in the planned time, working shifts and with up to 60 technicians in the plant. The easy handling of R448A, the fact that it is a direct replacement and the excellent operational strategy defined for the job together with Makro, helped in minimising the time.”
Aspen
STORM IS THE NEW NAME IN HVAC CLEAN ING.
VA
THE AIR IS FRESHER AND CLEANER AFTER A STORM!
To find out more about the range, contact us:
info@stormchemicals.com www.stormchemicals.com
www.acr-news.com
long lasting cleaning effe Unique formulas providin LONGER LASTING
the microscopic layer . Cleans deep into DEEPER CLEAN
September 2017 71
and the environment. Safe for the equipment, u SAFER
ser
ct. g a
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84
