Haocool
Author: Kiwi Export Cold Chain Senior Engineer
11 years quotation & EPC experience for kiwi industrial plantations and cross-border fruit exporters. Familiar with GB 50072 cold storage design standard & fresh kiwi postharvest preservation specification, distinguish regular constant humidity warehouse and airtight CA export warehouse two complete cost systems.
Kiwifruit is typical climacteric fruit, sensitive to temperature deviation, dry air and ethylene accumulation. Improper cold storage leads peel shrivel, core browning and rapid softening within 2 weeks at ambient temperature. Many plantation owners only compare total price without identifying CA airtight structure, ethylene scrubber and staged pre-cool room, resulting heavy export rejection loss.
1 GB 50072 Standard 100-Ton Kiwi Volume Reverse Calculation
Official Formula: Total Volume V = G ÷ (η × ρ)
Fixed Standard Parameters
1. Target capacity G = 100 tons
2. Small warehouse (≤1000m³) volume utilization coefficient η = 0.40
3. Carton packed kiwi unified density ρ = 0.22 t/m³
Exact Calculation
V = 100 ÷ (0.40 × 0.22) = 1136 m³
Matching Floor Area (Standard Clear Height 4m)
1136 ÷ 4 = 284 ㎡
Note: Industry rough empirical value 500–550m³ only applies multi-layer high rack stacking; GB calculated 1136m³ is mandatory for design drawing & equipment tender audit.
2 Full Turnkey Cost Table (Benchmark: 100mm B1 PU, Temperate Zone Max 32℃, Single Independent Chamber)
100-ton kiwi constant humidity cold storage for overseas sea export
| Warehouse Type | Exclusive Kiwi Matching | Total 100-Ton Investment (USD) | Max Storage Life |
|---|---|---|---|
| Regular Constant Humidity Warehouse | Micro-fog humidifier, low-speed air cooler, daily ventilation ethylene discharge | $38,000 – 48,000 | 50–60 days |
| CA Controlled Atmosphere Export Warehouse | Nitrogen generator, CO₂ scrubber, full airtight wall, ethylene scrubber | $72,000 – 95,000 | 100–120+ days |
Main Cost Premium Factors
- Import Bitzer parallel compressor upgrade: +25–33% total budget
- Southern plum rain double HDPE vapor barrier: +8–13%
- Independent 6h pre-cool buffer room: Extra $6,500 – 10,000
- Separate partition for different kiwi varieties: +10–16%
3 Four Core Fixed Cost Proportion (Kiwi Warehouse Exclusive)
- PU Insulation & Airtight Enclosure (30–38%): 100mm B1 PUR, full warm-side vapor barrier; CA warehouse add airtight sealing layer
- Refrigeration & Humidity System (32–42%): Low-wind evaporator, hot gas defrost
- CA Gas & Temp Monitoring (15–20%): O₂/CO₂/ethylene multi-point sensor (only for CA type)
- Installation & Air Tightness Test (12–18%): 72h full-load preservation calibration, CA pressure leak detection
4 Mandatory Kiwi Preservation Technical Standard (By Variety)
Stepwise Post-Harvest Pre-Cooling (Must Finish Within 24h After Picking)
Stage1: 10–12℃ hold 6–8h remove field heat
Stage2: 5–8℃ hold 6–8h
Stage3 Final Storage Temperature
- Green heart (Xuxiang/Cuixiang): 0 ~ +1℃
- Yellow heart (Jinyan): +1 ~ +2℃
- Red heart (Hongyang): +1 ~ +1.5℃
Fixed Humidity & Gas Limit
- Permanent RH: 90–95% to avoid peel shrinkage & weight loss
- Ethylene threshold: ＜0.1ppm; regular warehouse daily ventilation, CA equipped automatic scrubber
- Air flow ≤0.6m/s to prevent fruit surface dehydration
5 Real Italy Kiwi Export Project Case
Basic Info
- Scale: Standard CA warehouse, calculated volume 1120m³ (100 tons capacity)
- Full turnkey investment: $84,000
- Local mild climate, single pre-cool chamber matched
Measurable 12-Month Operation Benefits
- Off-season March selling price €1.85/kg vs harvest €0.78/kg huge premium
- Fruit spoilage scrap rate reduced from 15.3% down to 3.2%
- Support sea freight instead expensive air cargo, cut logistics cost 31%
- Full investment payback period: 10–12 months
6 7 Common Kiwi Cold Storage Hidden Pitfalls
- Omit staged pre-cool room → Uneven fruit core temp, short shelf life
- High-speed air cooler → Severe peel shrivel & weight loss
- Long-term storage below -0.5℃ → Irreversible cold spots & pulp browning
- Mix kiwi with apple/banana → Mass ethylene-induced softening
- CA warehouse without airtight wall → Gas leakage, storage period halved
- Omit micro-fog humidifier → 10%+ commodity weight loss
- Thin 80mm panel instead standard 100mm → Unit overload & high electricity cost
Simple ROI Calculation Formula For Kiwi Growers
Annual Net Income = Off-Season Price Premium − Annual Power & Maintenance − Spoilage Loss Reduction
Full Payback Months = Total Turnkey Investment ÷ Average Monthly Net Profit
FAQ For Kiwi Plantation & Fruit Exporters
Q1 How many cubic meters required for standard 100-ton kiwi warehouse per GB?
Calculated by GB formula V=100÷(0.4×0.22)=1136m³, matching 284㎡ with 4m height.
Q2 What’s the temperature difference between red/green heart kiwi?
Green heart 0–1℃, yellow heart 1–2℃, red heart 1–1.5℃; cannot unified 0℃ storage.
Q3 What extra equipment makes CA warehouse cost higher?
Add nitrogen generator, CO₂ scrubber, ethylene removal system and full airtight wall.
Q4 What upgrade for Sichuan/Yunnan plum rain kiwi base?
Install double HDPE warm-side vapor barrier to eliminate wall condensation & fruit mold.
Custom Kiwi Cold Storage Inquiry
Provide kiwi variety, export demand and local maximum humidity to get itemized quotation & staged pre-cool layout drawing.