The calculation method is very complicated, and it can be calculated by empirical formula, mainly depending on the area of refrigeration area, fresh air volume and use environment. There is a table for your reference.

load index (estimation) (for reference only):

building type cooling load w/m2 (cal/m2)

residence, apartment, Standard Room 114-138 (98-118)

Western Restaurant 211-286 (171-246)

Chinese Restaurant 257-438 (221-376)

Hotpot City, Barbecue 465-698 (411-611)

Small shops 175-267 (151-231)

Big shopping malls and department stores 251-411 (215-344)

Haircuts, Beauty 151-225 (129-193)

Meeting Room 211-311 (181-258)

Office 128-171 (111-146)

Atrium, Reception 112-151 (97-129)

Library 91-125 (77-118)

Exhibition Hall, Showroom 131-211 (112-172)

Theater 181-351 (154-311)

Computer room, Internet cafe 231-411 (211-351)

Workshop with cleaning requirements, Operating room, etc. 311-511 (258-431)

The above parameters are various types of refrigerating capacity per unit area. According to the above parameters, the refrigerating capacity of different use environments can be estimated. If the fresh air volume is large (greater than 31%), the refrigerating capacity per unit area can be appropriately increased.