How should door-opening frequency be included in energy testing of a commercial upright refrigerator?

Reproduce realistic door-opening frequency and duration, then compare energy use with internal temperature recovery. The buyer should request drawings, parameter limits, and test records so the delivered configuration can be checked objectively. Keep the approved sample and test conditions as a reference for later service, warranty, and performance disputes. The same technical definition should be used during quotation, FAT, delivery inspection, and SAT whenever possible. If the supplier cannot reproduce the agreed test conditions, the claimed capacity should not be treated as a directly comparable figure.