CO2 calculations in cold warehouse!?

Hello, My name is Alex Martinez and I am a master student of Supply Chain and Logistics at Eindhoven University of Technology in the Netherlands. Currently I am writing my master thesis and I am calculating how much CO2 is generated in a warehouse with a volume of 250.000 cubic metres. On average, how many KwH are needed to keep one cubic metre cool? I found out several values ranging from 0.9 to 3.5 kwH per cubic foot. 35.315 cubic feet is a cubic metre. If I multiply 35.315 x 0.9 KwH I have 31,78 kwH per cubic metre. If I multiply this number with the CO2 emission factor per KwH in the Netherlands is : 54,9 kwH x 392 (grams Co2) is 12459 gms CO2 per KwH, which means 12.45 kgs Co2 per kwH. If I multiply 12.45 kgs of CO2/m3 x 250000m3 I have 3,114,783 kgs (3,115 tonnes) of CO2, for just one day! Is that true? Are my calculations correct??? Kind regards and I truly hope for your reply! Alex