How to m design a cold room with heat load calculations & prices

Heat Load Components

The refrigeration system is selected based on the total heat load, which includes:

1. Transmission heat through walls, roof, floor, and doors.
2. Product cooling load.
3. Product respiration load (for fresh fruits and vegetables).
4. Air infiltration due to door opening.
5. Internal equipment load.
6. Lighting load.
7. Occupancy load.
8. Fan motor heat.
9. Defrost heat (where applicable).
10. Safety factor (typically 5–10%).

Typical PUF Panel Thickness

Recommended Air Velocity

• Vegetables and fruits: 0.15–0.30 m/s
• Dairy products: 0.20–0.40 m/s
• Meat storage: 0.30–0.50 m/s
• Blast freezer: 2–5 m/s

Refrigeration Design Inputs Required

To accurately size the refrigeration equipment, collect:

• Room dimensions (L × W × H)
• Product type
• Storage capacity (kg or tonnes)
• Required room temperature
• Ambient temperature
• Product entering temperature
• Daily product loading
• Number of door openings
• Location (city)
• Operating hours
• Electrical supply
• Preferred refrigerant (R290, R448A, R449A, R404A, CO₂, etc.)

A well-designed cold room should maintain a temperature variation of ±1°C, relative humidity within the required range, provide uniform airflow to all stored products, minimise infiltration and heat gain, and use energy-efficient refrigeration equipment to reduce operating costs.

If you're designing a commercial cold room, I can also provide a complete cold room design checklist and a step-by-step heat load calculation sheet (Excel format) used by refrigeration engineers.