Page 11 - Climalife_Contact_15_EN

COMMERCIAL REFRIGERATION I HYPERMARKETS
A two-step retrofit
Guillaume Allard, FCT Business Manager, planned the operation carefully over two nights (one night per plant), so that it could be carried out without any need to close the store.
The job required a team of two technicians per night, plus appropriate site preparation.
The cabinets did not need to be emptied and the temperature of the units was maintained using blocks of dry ice which were put in place as soon as the store closed.
The medium temperature cooling unit with four Bitzer compressors was dealt with first. With the use of Climalife packaging equipped with dual-phase valves, push-pull recovery optimised recovery time. The circuit was then filled with R-448A fluid before being restarted.
The following day the low temperature unit was con- verted. It also had four Bitzer compressors and the same procedure was followed.
FCT is very used to this type of job; it is one of their particular areas of expertise. The overall operation went very smoothly.
11 | CASE STUDY | February 2019 | Climalife contact #15 Testimonial
From left to right: Daniel Dias, Sales manager Climalife, Corentin Bonnec, Branch Manager FCT Vendargues, Guillaume Allard, Business Manager FCT, Grégory Lopez, Intermarché Manager.
3.1 19.5
Corentin Bonnec & Guillaume Allard confirmed that they “didn’t encounter any particular difficulty during the R-448A retrofit.”
The settings of the installation’s Danfoss control system were configured to suit the new fluid. "The setpoints were taken into account but they were based on the average temperature to compensate for the Solstice® N40's glide," explained Mr. Bonnec.
BEFORE R-404A CONVERSION
AFTER CONVERSION TO R-448A
Unit Power plant +
Power plant - Power plant +
Power plant -
Cooling capacity Kw 277.2 KW
69.08 KW /
/
Discharge Kw 415.2 KW
148 KW /
/
0.6 2.5
0.4
Evaporating temperature °C -11°C
-35°C -11°C
-33°C
19.5 20.1
20.1
Condensing temperature °C +45°C
+45°C +45°C
+45°C
Discharge temperature °C 91.2
131.5 98.7
90
Suction temperature °C 6°C
-15°C 6°C
-25°C
Regulator inlet temperature °C +42°C
+42°C +42°C
+42°C
Refrigeration capacity (positions) Kw 365.35 KW
42.23KW 365.35 KW
42.23KW
Compressor capacity Kw 69.3 KW
17.27 KW /
/
Compressor make and model Bitzer 6F-40.2Y
Bitzer 4G-20.2Y Bitzer 6F-40.2Y
Bitzer 4G-20.2Y
Condenser make and model HK H9462B12BPN
HK H9155B48PN HK H9462B12BPN
HK H9155B48PN
Condenser capacity Kw 389 KW DT10
142 KW DT11 330 KW DT10
121.38 KW DT11
Refrigerant charge Kg 400
300 430
350
Oil brand Climalife HQ
Climalife HQ Climalife HQ
Climalife HQ
Oil type POE 32 POE 32
Oil quantity (L) 40
25 40
25
External air temperature °C 30
30 30
30
Evaporating pressure
Condensing pressure
Bar
Bar
Water softener for misting system
R-448A medium temperature plant