Vegetable Vacuum Cooler Application Technology Analysis
From principle to selection — vacuum level ≤660Pa, 30~50 min/batch, final temp 0~10°C adjustable. Complete vegetable cooling parameter reference table included.
Why Conventional Cooling Falls Short
Leafy greens left at room temperature start wilting after 4-6 hours. A standard cold room takes 8-10 hours to reach 8°C core temperature — by then, the center of the produce is still warm.
Vacuum precooling works differently. Under low pressure, surface moisture evaporates rapidly, absorbing latent heat from the produce itself. Each gram of water evaporated removes approximately 2,260 joules of heat.
How It Works
Key point often misunderstood — the vacuum pump does NOT cool the product. It only removes non-condensable gases. Actual cooling comes from the refrigeration system: water vapor condenses on the cold trap (evaporator at -10°C~-5°C), and the refrigerant cycle expels latent heat.
No defrost cycle needed. Each batch runs 30-50 min, frost buildup is minimal, and the next hot batch naturally melts any residual frost.
CVF Series Specs
| Model | Capacity | Vacuum | Batch Time | Final Temp |
|---|---|---|---|---|
| CVF-1000E | 2P | ≤660Pa | 30~40min | 0~10°C |
| CVF-2000E | 4P | ≤660Pa | 35~45min | 0~10°C |
| CVF-3000E | 6P | ≤660Pa | 35~45min | 0~10°C |
| CVF-4000E | 8P | ≤660Pa | 40~50min | 0~10°C |
| CVF-6000 | 12P | ≤660Pa | 40~50min | 0~10°C |
Vegetable Cooling Parameters
| Type | Cooling Time | Moisture Loss |
|---|---|---|
| Spinach/Lettuce | 25~35min | 1.5~2.5% |
| Head Lettuce | 30~40min | 1.0~2.0% |
| Choy Sum/Kai Lan | 30~40min | 1.5~2.5% |
| Mushroom | 20~30min | 0.5~1.5% |
| Fresh Cut Flowers | 20~30min | 1.0~2.0% |
| Strawberry/Blueberry | 25~35min | 0.5~1.5% |
Case Study: Hong Kong Export Farm, Dongguan
CVF-2000E, three months of operation data:
- Cooling time: 8 hrs → 35 min
- Spoilage rate: 12% → under 3%
- Power: ~18 kWh per batch, 60% less than cold room
Yuanxian Machinery — specializing in vegetable vacuum cooling equipment.