Selection scope and sizing decision
Useful for: Food distributors carrying chilled, frozen or chill-sensitive cargoes at different setpoints on the same route
Each compartment creates a separate heat-load and airflow problem, while partitions and door openings also transfer heat between zones. The smallest or most frequently opened zone can control recovery performance.
Route planning matters because cargo is removed over time. Zone size, partition position and return-air paths may change after each stop, so the operating plan belongs in the configuration brief.
Sizing inputs
Supply these values before a model, body size or working rating is selected:
- 01Cargo and approved temperature range for each zone
- 02Zone volume and partition position through the route
- 03Starting cargo and body temperatures
- 04Door sizes, stop sequence and opening duration
- 05Evaporator, airflow, defrost and drainage concept
- 06Independent monitoring, alarms and excursion response
From sizing inputs to model approval
Size from the operating requirement, test the complete configuration and retain the project records that control the final selection.
- 01Define the target duty
Multi-temperature refrigerated truck compartment configuration
- 02Quantify sizing inputs
Cargo and approved temperature range for each zone; Zone volume and partition position through the route
- 03Test the complete vehicle
Zone duty and Air separation must both pass.
- 04Approve the selected rating
Zone-by-zone cargo and route brief; Partition, door and airflow drawing
Selection and sizing matrix
Use every row to test the proposed size. A nominal value is not sufficient when payload, geometry or operating limits conflict.
Scroll horizontally to view all columns.
| Decision factor | What to choose or check | Limit or condition |
|---|---|---|
| Zone duty | Define simultaneous setpoints and cargo for every compartment. | Chilled and frozen labels are not complete specifications. |
| Air separation | Provide controlled supply and return paths for each zone. | A partition without controlled airflow may not maintain separate conditions. |
| Route change | Model door openings, changing cargo mass and divider positions. | The departure layout does not represent every stop. |
| Monitoring | Identify sensor location, records, alarms and cargo response by zone. | One air sensor does not describe every product temperature. |
Applied calculation
Keep zone loads separate before checking shared capacity A multi-temperature selection needs a load for each zone plus the interaction created by partitions and door openings.
- 01Base simultaneous load5.0 kW before interaction allowance
3.2 + 1.8 - 02Zone capacityMust be shown separately
Each evaporator or air system maintains its own project condition - 03System capacityMust pass
Available simultaneous capacity ≥ combined approved design loads
Decision: The 5.0 kW base sum is only a starting point. Partition leakage, door sequence, defrost and changing cargo layout remain part of the supplier calculation.
Evidence boundary: Illustrative values only. Cargo requirements and the refrigeration supplier calculation control the final design.
Selection evidence checklist
Ask for evidence that is traceable to the selected model, configuration, vehicle or project scope. A record from another project is context, not verification.
- Zone-by-zone cargo and route brief
- Partition, door and airflow drawing
- Supplier heat-load and capacity selection by zone
- Commissioning and temperature-mapping plan
Selection and sizing traps
Adding a divider to a single-zone body
Better selection method: Design independent airflow and capacity for each required condition.
Using equal zone sizes without route data
Better selection method: Size compartments from cargo and stop sequence.
Monitoring only the coldest compartment
Better selection method: Define traceable sensing and response for every zone.
Limitations
- Cargo-owner and destination food-safety requirements remain controlling.
- USDA examples explain principles but do not size a KEEYAK project.
- Do not combine cargoes without approved segregation, temperature control, monitoring and excursion procedures.
Evidence scope and technical basis
Each source is limited to what it can support. This makes the evidence chain readable to buyers, search engines and AI systems without turning a general source into a project claim.
Supports: Controls the project-input, quotation, approval and inspection workflow described in this guide.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Provides public checklists and worksheets; the signed project documents remain controlling.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Primary public guidance supporting preconditioning, airflow, door-seal and loading checks. Cargo-owner and destination requirements remain controlling.
Does not establish: It is authority, jurisdiction or subject specific and does not approve the selected vehicle for another destination or project.