|
The refrigeration needed for the different store rooms is generated centrally by three systems:
a) HT gravity circulation ammonia system using two T20-BWFG plate heat exchangers with three Frick screw compressors RXF68, 1,018 kW each, two on-duty and one stand-by producing 12 ºC; one chilled water facility for cooling the regular storage rooms
b) MT gravity circulation ammonia system using two T20-MWFG plate heat exchangers with 4 Frick screw compressors RWF II-134, 750 kW each, all on-duty producing chilled propylene Glycol at -10 ºC required for all MT applications
c) LT pump circulation system with two -36 ºC low-stage compressors RWF II-134 , 330 kW each, all on-duty with one swing compressor RWF II-134, 750/330 kW, for LT freezer room applications
7 banana ripening rooms connected with the MT glycol circuit, controlled by 110 propa controllers via central PC
2 forced-air wet coolers with -12 ºC pump circulation system connected with the MT system; serves to pre-cool all vegetables
All systems are controlled and monitored by a central PC unit using Johnson Controls DDC controllers FXO6, FX14, FX16. All coolers were assembled with variable-speed, built-in fan motors. I.e. the speed and temperature can be controlled to reduce power consumption and running costs.
|