- Heat load: heat the system must remove.
- Cooling capacity: heat a unit can remove at stated conditions.
- TD: room-to-evaporating temperature difference.
- Air change: replacement of one room-air volume.
- Design point: temperatures and pressures used for rating.
- Safety margin: justified allowance, not a universal percentage.
In short: compare capacities only at matching conditions.
Glossary
| Term | Definition |
|---|---|
| Heat load | The total rate of heat that must be removed to hold temperature, in watts (W) or kilowatts (kW). It sums transmission through panels, infiltration from door openings, the product being cooled, and internal sources (lights, fans, people). See Heat load calculation |
| TD (temperature difference) | The gap between room temperature and the evaporating temperature. A small TD keeps humidity high (good for fresh produce); a large TD dries the air and dehydrates product but gives more capacity per coil. |
| Air change | One complete replacement of the room's air volume. Used in heat-load calculations to estimate infiltration loss from door openings — the more often the door opens, the more warm, humid air must be re-cooled. |
To turn these terms into a sized room, use the Frostbox size calculator, then request a quote.
Related articles
- Cold room terminology: an overview
- Construction & insulation terms
- Unit type & operating-regime terms
- Heat load calculation
- Using the Frostbox size calculator
Missing a term, or need a specification confirmed for your project? Contact [email protected].
