What is the right way of blast freezer heat load calculations.

In one refers to Crack USA manual they say calculate product load & multiply that by 1.5 for System load.
By FAO Bulletins, multiply by 1.3 for system capacity.


I think the issue is working hour calculations.

Typically for 18 Hr working operation the system load is calculated by basic load x 24 / 18. Now if this factor is also applicable for product load.

That factor seems to be applicable for continuous operations. In some cases heat load is with this factor on entire product load & it some cases that factor is not considered on Product load.

Helpman software still gives totally different values much on the lower side.

Can some one throw more light on this.?