The Ultimate Guide to Calculating Cooling Capacity of Outdoor Cabinets | 3 Steps to Accurate Selection + Example Analysis
Subtitle: A Must-Read for the Telecom/Power Industry! High-Temperature Shutdown Prevention Solution
Core Formula
Outdoor Cabinet Cooling Capacity = (Equipment Heat Dissipation + Environmental Heat Transfer + Solar Radiation) × Safety Margin
Wrong Selection = Equipment Downtime! Accurate Calculation is the Key
I. Analysis of the Three Major Heat Sources (Including Quick Calculation Templates)
1. Equipment Heat Dissipation (Q₁)
Industry Pain Points: 90% of Over-Temperature Failures Come from Underestimating Equipment Heat!
Calculation method:
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ΣEquipment power consumption (W) = server power consumption + power supply power consumption + others
✅ Example: 2 500W servers + 200W power supply = **1200W**
2. Environmental heat transfer (Q₂)
Key parameter table (collect for future use):
| Insulation material | Thermal conductivity λ (W/m·K) | Applicable scenarios |
| Polyurethane | 0.02-0.03 | High cold/high temperature area |
| Rock wool | 0.04-0.06 | Normal climate |
Calculation formula:
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Q₂ = [λ × cabinet surface area (m²) × temperature difference (ΔT)] / insulation layer thickness (δ)
✅ Example: 8.8m² cabinet/ΔT=20K/δ=0.05m → 105.6W
3. Solar radiation heat (Q₃)
Regional difference warning:
The radiation intensity in tropical areas is as high as 1000W/m² (only 600W/m² in temperate zones)
Cost-saving tips:
Light cabinet absorption coefficient (0.3-0.5) vs dark cabinet (0.7-0.9) → refrigeration equipment costs reduced by 30%!
✅ Example: 3m² receiving surface → 720W
II. Ultimate calculation template (Excel can be directly applied)
| Heat source type | Calculation method | Example value |
| Q₁ | Total power consumption of equipment | 1700W |
| Q₂ | (λ×S×ΔT)/δ | 105W |
| Q₃ | Radiation intensity×area×absorption rate×60% | 720W |
| Safety margin | 20% (required!) | ×1.2 |
| Total cooling capacity | (Q₁+Q₂+Q₃)×1.2 | 3030W |
⚠️ Selection conclusion: Choose ≥3.1kW outdoor dedicated cooling equipment
II. Engineers' guide to avoid pitfalls (industry experience)
Fatal misunderstandings
Indoor air conditioners used in outdoor cabinets → The efficiency plummets by 60% on hot days!
✅ Solution: Choose outdoor models with a temperature resistance of -30℃~55℃
Hidden cost black hole
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Sealed cabinet: must rely 100% on refrigeration equipment
Ventilated cabinet: can reduce 10-20% of cooling capacity → save $500+ in electricity bills per year!
Hot spot failure prevention
Equipment-intensive areas must meet: ventilation frequency ≥30 times/hour
Recommended solution: side-mounted circulation fan + top strong exhaust
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