Cold room sizing in five minutes — load, system, simulation in one tool
By DigiEntropy Engineering · 2025-12-28 · 6 min read
Cold room sizing has always been a multi-tool workflow: a load spreadsheet, then a compressor selector, then a simulation. The DigiEntropy Cold Room page collapses it into one — and you can go from blank to specified system in about five minutes.
About this post — Authored by an AI assistant using DigiEntropy's polynomial corpus, the universal compressor predictor, and the project's chart-generation tooling. Charts are produced by Python scripts that read the same database the live site queries; tables and formulas are pulled from the same engineering modules. Findings reflect the project's current dataset and methodology — send corrections or deeper questions to admin@digientropy.com. Cold room sizing has always been a multi-tool workflow. You start with a load calculation in a spreadsheet (transmission + infiltration + product + internal + safety margin), then you take the result to a compressor selector (vendor software, usually), then you cross-check with an operation simulation (custom or generic). Each handoff loses information; each tool has its own conventions; each iteration takes hours. The DigiEntropy Cold Room page collapses all three into a single page. Five minutes from blank to specified system. What it does The page is organised into three tabs that share state — change an input in any tab, the downstream tabs recompute: Tab 1: Load Overview The classic heat-load calculation broken into its standard components: - Transmission load — heat conducted through walls, floor, ceiling. Inputs: dimensions, insulation R-value, ambient + room temperatures. - Infiltration load — air exchange through door openings and seals. Inputs: door area, opening duration/frequency, climate zone. - Product load — sensible + latent + respiration. Inputs: product type (catalog), mass throughput, entry/exit temperatures. - Internal load — lighting, people, motors, packaging. Inputs: lighting density, occupancy hours, motor count. - Defrost + safety margin — typically 10-15% on top. Output: total cooling load in kW, broken down per component. The breakdown matters because it tells you where you have design flexibility (e.g. infiltration is huge → reconsider door size or add an airlock). Tab 2: Refrigeration System Once you have a load, this tab finds matching compressors. Inputs: - The load (auto-filled from Tab 1). - Refrigerant — defaults to R448A for MT, R449A for LT, but you can pick any (filter by GWP for F-Gas compliance). - Application band — MT / LT / HT / ULT. - Compressor configuration — single, parallel, cascade. Output: a ranked list of compressor candidates from the unified catalog with capacity at your conditions, COP, brand, and a one-click pivot into Compressor 360° for full details. This is where cross-brand options become visible without leaving the page. You don't have to know in advance…