Hi All,
I just started to step in this industry,
Please give me some suggestion how to calculate the PDU and KW for the following coldroom.

Room Dimension: 3615mmX3615mmX4038mm(H)X75mm(T)
Temperature Require: -2'C
Storage: Chinese Broccoli/Kai Lan
Frequency To Open Sliding Door: 20% per Day.

How To Calculate The PDU and KW For this coldroom without any support of software.
Please Advice The Calculation.
Thanks a lot...