Frequently Asked Questions

Vacuum cooling is a rapid cooling technology that uses evaporative cooling under vacuum conditions to remove heat from fresh produce or cooked food. By reducing the pressure in a sealed chamber, water on the product surface evaporates at low temperature, quickly removing heat. It is 6-10x faster than forced-air cooling and achieves uniform temperature reduction throughout the product.

Vacuum pre-cooling is significantly faster (20-40 minutes vs 3-6 hours for forced-air), more uniform (cools the entire batch evenly), and results in less weight loss (<2% vs 3-5%). It also removes field heat immediately after harvest, which is critical for extending shelf life. Forced-air cooling requires cold air to penetrate through packaging, while vacuum cooling works from the inside out as moisture evaporates from the entire product surface.

The target temperature depends on the product. Most leafy greens and herbs are cooled to 0-4°C. Berries and mushrooms to 2-4°C. Broccoli and cauliflower to 0-2°C. The vacuum pre-cooler can be set to any target temperature from 0°C to 15°C depending on your cold chain requirements.

Products with high surface-area-to-volume ratio and high moisture content benefit most. This includes leafy greens (lettuce, spinach, kale), herbs (cilantro, basil, mint), mushrooms, broccoli, cauliflower, berries, and cut flowers. Vacuum cooling is also highly effective for cooked foods like soups, stews, sauces, rice, pasta, and baked goods.

Yes, vacuum cooling is excellent for cooked meat and poultry products. After cooking, meat must be cooled through the danger zone (60°C to 10°C) quickly to prevent bacterial growth. Vacuum cooling achieves this in minutes rather than hours, making it ideal for HACCP compliance. However, raw meat is not typically vacuum cooled as the weight loss from evaporative cooling may affect yield.

The main difference is the incoming product temperature. Vacuum pre-coolers handle fresh produce at ambient temperature (25-30°C), while food vacuum coolers are designed for hot cooked food (80-90°C). Food vacuum coolers require a two-stage vacuum system (water ring pump + rotary vane pump) to handle the large volume of steam generated during cooling, and may need dual-stage water catchers for high-temperature applications.

Our vacuum pre-coolers range from CVF-1000 (200-400 kg/batch) to CVF-6000 (2000-2500 kg/batch). Our food vacuum coolers range from CVF-50 (50 kg/batch) to CVF-1000 (1000 kg/batch). The actual capacity depends on the product type, initial temperature, and desired final temperature. Contact our engineering team for a specific capacity calculation.

The cost depends on capacity, configuration, and application. A CVF-50 food vacuum cooler for small bakeries starts at approximately $8,000-$12,000. Industrial systems like the CVF-6000 for large farms range from $40,000-$80,000. For an exact quote, contact us with your product type, batch size, and target temperature requirements.

Vacuum pre-cooling can extend shelf life by 40-70% for most produce compared to no pre-cooling. For example, lettuce lasts 14-21 days instead of 5-7 days, mushrooms last 7-10 days vs 2-3 days, and broccoli lasts 21-28 days vs 7-10 days. The actual extension depends on maintaining the cold chain after pre-cooling.

Yes, we export worldwide. Our equipment ships to Southeast Asia, the Middle East, Europe, North and South America, and Africa. We have CE certification and can provide compliance documentation for your region. We offer multilingual support, remote commissioning, and global warranty service.

Freeze drying (lyophilization) freezes the product first, then sublimates ice directly to vapor under vacuum, removing 95-99% of moisture. This preserves the product's structure, nutrients, and flavor for years without refrigeration. Vacuum cooling only removes 1-3% moisture to rapidly cool the product for short-term cold chain preservation (days to weeks). Freeze drying is for long-term storage; vacuum cooling is for fresh supply chain management.

A complete vacuum pre-cooling cycle typically takes 20-40 minutes from chamber loading to product reaching target temperature. The actual time depends on the product (leafy greens cool faster than dense vegetables), initial temperature, batch size, and target temperature. Our CVF series includes automatic cycle control that stops precisely when the target temperature is reached.