Load build-up sets out the selected room's design load line by line. Every row has its figure and its basis: the arithmetic, and where each input came from. The page's own defaults say “no cited source”.
How the totals are built
- 1
Holding load: transmission through each surface, infiltration, internal loads, defrost and product respiration.
- 2
Pull-down load: the holding load plus Product pull-down, the heat taken out of the incoming batch and its packaging over the pull-down time.
- 3
The larger of the two governs sizing, and its row says so.
- 4
Safety factor: a percentage of the governing load.
- 5
Design load: the governing load plus the safety factor, as a 24-hour load, times 24 and divided by the Run hours.
Safety factor and run hours
Both are under Sizing basis. The Safety factor's page default has no cited source: the final margin is an engineering judgement, and its basis says whether the figure is the default or one you entered. Run hours is the hours a day the plant runs to carry the day's load, so fewer run hours give a larger design load.
Warnings
Conditions the calculation finds itself sit at the top of the build-up: the doorway method reading far above the air-change estimate, or a room at a temperature its produce is damaged at.
Where else the loads show
- The strip of readings above the page shows the selected room's Design load, Holding load and the All rooms total by default. Pin readings chooses others, such as each component or each suction group. The choice is remembered in this browser.
- The Room ledger shows each room's design and holding loads, and totals them by suction group.
- Download report at the foot of the ledger makes a report of every room as saved, not the unsaved figures on screen.
Note
Every result needs checking by a suitably qualified refrigeration engineer before installation, as the foot of the build-up says.