Haocool
Author: Senior Sichuan Basin High-Humidity Farm & Herbal Cold Chain Engineer
12 years large cold park EPC experience in Sichuan Chongqing subtropical humid regions. Familiar with GB 50072-2021 Cold Storage Standard, GB31605 Food Cold Chain Hygiene Norm, SB/T 11095 Chinese Herbal Medicine Warehouse Spec & GSP herbal storage rules, specialized in dual-purpose fruit/meat/herbal multi-temperature high-moisture design for Sichuan plum rain climate.
Project Overview
This integrated 3-building cold chain logistics park is located in Meishan, Sichuan, a major fruit and Chinese medicinal herb producing area. Local climate feature: annual average RH 78%–85%, long plum rain season, summer peak ambient 35℃+ sultry high humidity, easy to cause fruit mildew, herbal oil exudation and insect infestation without dedicated moisture-proof design. The whole park integrates fresh agricultural storage, frozen meat warehouse, sorting logistics transit and constant-humidity herbal medicine storage, fully complying food HACCP and herbal GSP audit standards.
Core Basic Project Data
- Total nominal volume: 35,000 m³
Building 4 (Dual-story fresh & cooked food): 0~10℃ chilled area, 14.15m height
Building 5 (Logistics transit two-story): Multi-temperature sorting buffer zone
Building 6 (Chinese herbal medicine dedicated warehouse): 2–20℃ constant humidity herbal storage - GB standard total usable capacity calculation:
Average mixed cargo density 0.32 t/m³, volume utilization coefficient η=0.54
Total storage ton = 35000 × 0.54 × 0.32 = 6048 tons (actual full load 8,000 tons with multi-layer high rack stacking) - Full construction & commission cycle: 6 calendar months
- Compliance certification: GB50072, food HACCP, SB/T11095 herbal storage, GSP herbal warehouse audit
Pre-Construction Core Operational & Quality Pain Points
- Original scattered small cold rooms without independent herbal partition, mixed storage with fruits leads herbal odor absorption & oil exudation, annual scrap rate up to 11.5%;
- Single-layer insulation without full vapor barrier, plum rain wall continuous condensation, fruit mold loss severe;
- Ordinary single refrigeration unit without standby loop, summer high temperature frequent overload shutdown, batch goods risk;
- Simple manual temperature records unable to pass annual food & herbal market supervision inspection;
- No dedicated constant humidity equipment for herbal zone, high humidity triggers insect breeding and medicinal value decline.
1 Sichuan Plum Rain Exclusive Double Vapor Barrier Envelope System
Comply with southern high-humidity GB50072 mandatory clause:
| Zone Type | PU Panel Standard | Humidity Anti-Condensation Optimization |
|---|---|---|
| 0~10℃ Fresh Food Area | 100mm B1 flame retardant PUR | Double-layer full HDPE warm-side vapor barrier, all panel joints mildew-proof low-temp sealant |
| -18℃ Frozen Meat Zone | 150mm B1 high-density PUR | Thickened anti-freeze XPS floor with drainage slope |
| Herbal Medicine Constant Humidity Zone | 100mm B1 anti-mildew PUR | Independent airtight wall, light-shield ceiling to prevent herbal photooxidation |
Core construction rule: All suspension brackets & pipeline holes fitted nylon insulation gaskets to eliminate cold bridge ceiling sweating; all cold vestibules equipped heating air curtains to block hot humid air inflow during frequent loading.
2 Hybrid CO₂ Transcritical + Screw Refrigeration System (Adapted To 35℃ Summer Ambient)
Design Matching Logic For Three Buildings
- Fresh fruit & sorting building: CO₂ booster transcritical unit with evaporative cooling condenser, solve Meishan summer high ambient efficiency attenuation; low-speed air coolers to avoid fruit water loss.
- Frozen meat zone: Bitzer parallel screw rack, 1-main-1-standby redundant per chamber.
- Herbal constant humidity warehouse: Independent small screw units + industrial rotary dehumidifier interlock control.
Unified Power Safety Standard
Dual municipal power supply + 72h UPS for all temp & humidity monitoring equipment, uninterrupted non-editable data recording during power outage.
3 Chinese Herbal Medicine GSP Exclusive Constant Humidity Control System
Mandatory herbal storage RH range: 35%–75%, temp classified zoning
1. Cold herbal warehouse: 2–8℃ (ginseng, cordyceps, easily deteriorated medicinal materials)
2. Shaded herbal warehouse: ≤20℃ (liquorice, astragalus bulk herbs)
- Equipped multi-point RH sensors, auto start/stop large dehumidifier when RH exceeds 75%;
- Full light-shield wall & ceiling, no direct sunlight; low-wind circulation to prevent herb surface drying.
4 HACCP & Herbal Isolation Logistics Layout
Three Building Functional Separation (No Cross Contamination)
- Building 4 Fresh Zone: Raw fruit receiving → pre-cool buffer → finished outbound, independent passage separated from herbal area;
- Building 5 Logistics Transit: Shared constant temp sorting vestibule with physical partition to avoid odor cross mixing;
- Building 6 Dedicated Herbal Warehouse: Fully isolated single access, independent defective herbal isolation room for audit compliance.
Mandatory One-Way Flow
Separate personnel & cargo passages; food zone and herbal zone fully wall partition, no shared cold doors or air circulation channels to prevent odor cross-contamination.
5 Intelligent Centralized Monitoring Platform
Siemens PLC full park centralized control:
1. Multi-point PT100 temp & RH sensors, fluctuation limited ≤±0.8℃ for food, ≤±0.5℃ for herbal warehouse;
2. 5-year non-editable encrypted data storage, one-click export HACCP & GSP audit reports;
3. Multi-level linkage alarm: on-site sound-light + mobile SMS remote push for humidity/temp over-limit.
6 Measurable 12-Month Park Operation Benefits
- Independent herbal isolated zone + full vapor barrier eliminate condensation & cross odor, herbal scrap rate reduced from 11.5% down below 1.3%;
- CO₂ evaporative cooling system cut annual refrigeration power consumption by 30% vs traditional single-stage unit;
- Separate food/herbal layout pass food & herbal supervision double audit at one time without rectification;
- Constant humidity herbal equipment restrain insect breeding, extend medicinal material storage cycle by 4 months;
- Multi-temperature integrated layout lift annual goods turnover efficiency by 40%.
7 7 Common Sichuan High-Humidity Agri-Herbal Cold Park Inspection Pitfalls
- Omit double vapor barrier for Sichuan plum rain → year-round wall condensation & fruit/herbal mildew
- Shared air circulation between fruit and herbal zones → permanent odor cross-contamination, audit failure
- No independent dehumidifier for herbal warehouse → high humidity causes insect infestation & oil exudation
- Single compressor without standby → summer overload mass goods loss risk
- Editable temperature & humidity records → invalid data for food/GSP supervision
- No light-shield structure for herbal warehouse → medicinal material photooxidation devaluation
- Ordinary high-speed air coolers → fruit shrinkage, herbal surface drying weight loss
FAQ For Sichuan Agricultural Industrial Park Operators
Q1 What special anti-moisture design for Meishan plum rain cold park?
All walls & roofs adopt double HDPE full vapor barrier, each loading vestibule fitted heating air curtain, herbal zone matched dedicated rotary dehumidifier.
Q2 What’s the mandatory humidity range for Chinese herbal medicine storage?
Stable RH 35%–75% per SB/T11095 & GSP standard, split 2–8℃ cold zone and ≤20℃ shaded zone by herb type.
Q3 Why separate herbal warehouse from fruit cold room completely?
Fruits release volatile esters & ethylene gas, easily absorbed by medicinal herbs to change original medicinal odor, fail market supervision inspection.
Q4 What advantage of CO₂ transcritical unit in Sichuan 35℃ summer?
Matched evaporative cooling air cooler reduces inlet air temperature, greatly improve unit COP under high ambient temperature, save long-term electricity cost.
Custom Sichuan High-Humidity Agri & Herbal Cold Park Inquiry
Provide total volume, proportion of fruit/frozen meat/herbs and local summer max temperature to get moisture-proof layout & full itemized quotation.
Construction & Completion Photos
