[Case Study] 80% Reduction in Cooling Time + Water Loss Rate Below 2% — Application of CVF Food Vacuum Rapid Cooler in Prepared Dishes and Braised Products
Core conclusion: Food vacuum rapid coolers use the principle of vacuum evaporative heat absorption to cool hot food from 75–90℃ to 0–8℃ within 10–20 minutes.
[Case Study] 80% Cooling Time Reduction + Water Loss Rate Reduced to Below 2% — Application of the CVF Food Vacuum Rapid Cooler in Prepared Dishes and Braised Products
Core Conclusion: Through the principle of vacuum evaporative heat absorption, the food vacuum rapid cooler cools hot food at 75–90℃ to 0–8℃ within 10–20 minutes. Compared with traditional air cooling, it shortens cooling time by 80%, and reduces the water loss rate from 5%~8% to 0.8%~2.8%. Based on three delivered projects—a Shanghai central kitchen, Huangshanghuang Group, and a Beijing bakery factory—this article presents measured data on vacuum rapid cooling technology in prepared dishes, braised products, and baked foods.
I. Industry Background: Engineering Pain Points in Hot Food Cooling
Cooked food cooling has long faced three conflicting challenges: cooling speed—food must pass through the 60℃→10℃ danger temperature zone within 2 hours, which traditional air cooling struggles to achieve; water loss rate—air cooling reaches as high as 5%~8%, causing products to become dry and shriveled and reducing yield; condensation water—natural cooling forms water droplets on the surface, making products prone to mold and bag swelling after packaging. Vacuum rapid cooling technology uses the principle that the boiling point of water decreases as pressure decreases. In a vacuum chamber, moisture on the food surface rapidly evaporates and carries away latent heat, providing an engineered solution to the above problems.
II. Technical Solution: Principle and Configuration of the CVF Food Vacuum Rapid Cooler
The food vacuum rapid cooler is an industrial refrigeration equipment that uses the principle of vacuum evaporative cooling. Core process: hot food (75–90℃) is placed into a SUS304 stainless steel vacuum chamber → the vacuum pump reduces the chamber pressure to 0.5–2.0 kPa (absolute pressure) → water evaporates and carries away heat → the vapor condenser (cold trap) (i.e., the evaporator/heat-absorbing end of the refrigeration system, distinct from the condenser/heat-rejection end) condenses water vapor to maintain the vacuum → after reaching the target temperature, the vacuum is broken and the material is unloaded.
Comparison of Key Technical Parameters
| Parameter Item | Traditional Air Cooling | CVF Vacuum Rapid Cooling |
|---|---|---|
| Cooling time (200 kg) | 120–150 min | 10–20 min |
| Water loss rate (prepared dishes) | 5%~8% | 1.8%~2.8% |
| Water loss rate (baking) | 3%~5% | 0.8%~1.8% |
| Surface condensation water | Severe | None |
| Danger zone time | >90 min | <20 min |
| Equipment series: Uses a Bitzer semi-hermetic reciprocating compressor / Copeland scroll compressor + shell-and-tube vapor condenser. The model numbers correspond to batch processing capacity—CVF-100 (100 kg/batch), CVF-300 (300 kg/batch), CVF-500 (500 kg/batch). All food-contact surfaces are SUS304 stainless steel. |
III. Case Data: Measured Results from Three Delivered Projects
Case 1: A Central Kitchen in Shanghai — Prepared Dishes (Delivered in 2025)
| Item | Data |
|---|---|
| Equipment | CVF-500 (dual vapor condensers + chilled water pre-cooling module) |
| Food | Braised pork, Kung Pao chicken, Yuxiang shredded pork |
| Batch weight | 200 kg/batch |
| Feed → target | 75–85℃ → 4–8℃ |
| Cooling time | 30–35 min (air cooling 150 min) |
| Water loss rate | 2.0%~2.8% (air cooling 5%~8%) |
| Compressor | Bitzer 6DC-8.2-50S |
| Vapor condenser area | 2×18 m² shell-and-tube |
| Engineering value: Daily output increased from 4 batches to more than 12 batches. |
Case 2: A Food Company in Changsha — Braised Products (Delivered in December 2025)
| Item | Data |
|---|---|
| Equipment | CVF-300 (dual vapor condensers) |
| Food | Braised duck necks, braised duck wings, braised lotus root slices |
| Batch weight | 100 kg/batch |
| Feed → target | 85–90℃ → 0–4℃ |
| Cooling time | 35–40 min |
| Water loss rate | 1.8%~2.5% |
| Compressor | Bitzer 4DC-6.2-30S |
| Vapor condenser area | 2×12 m² shell-and-tube |
| Engineering value: Intact skin, texture indistinguishable from natural cooling, capacity increased by 300%. |
Case 3: A Beijing Bakery Chain Factory (Delivered in October 2025)
| Item | Data |
|---|---|
| Equipment | CVF-100 + CVF-300 dual lines |
| Food | Toast bread, chiffon cake |
| Batch weight | 50–100 kg/batch |
| Feed → target | 80–90℃ → 8–12℃ (bread), 4–8℃ (cake) |
| Cooling time | 10–15 min |
| Water loss rate (bread) | 0.8%~1.8% |
| Monthly output | 80 tons → 200 tons |
| Engineering value: No bread collapse, monthly output increased by 150%. |
IV. Customer Feedback
Production Manager of the Shanghai Central Kitchen: “Traditional air cooling 30 minutes is shortened to 8 minutes with vacuum rapid cooling (single tray); water loss rate is reduced by 50%; there is no condensation water in packaging, completely solving the bag swelling pain point.”
Chief Engineer of a food factory in Changsha: “After rapid cooling, the surface of the braised products remains intact, and the taste is no different from natural cooling. Capacity increased by 300%; this is an engineering upgrade for the braised product cooling process.” Plant Manager of a Beijing Bakery: “The bread crust remains intact with no collapse; monthly output increased from 80 tons to 200 tons. Vacuum rapid cooling has solved the capacity bottleneck in the cooling step of the baking industry.”
5. Summary
- Cooling efficiency transformation: 120–150 min → 30–50 min, a reduction of 75%~80%, allowing production line takt time to match packaging takt time.
- Controllable weight loss rate: From 5%~8% to 0.8%~2.8%, yielding 3–6 kg more finished product per 100 kg.
- Food safety compliance: Danger zone pass-through time reduced from >90 min to <20 min.
- Improved packaging quality: No residual condensed water, eliminating hidden risks of mold and bag swelling. For hot food processing enterprises with a daily processing capacity exceeding 1 ton, vacuum rapid cooling technology has changed from an “optional upgrade” to an engineering necessity for breaking production line efficiency bottlenecks.
Frequently Asked Questions (FAQ)
Q1: What is the difference between a food vacuum rapid cooler and a fruit and vegetable vacuum precooler? A: The feed temperature is different — a food rapid cooler handles 75–90°C hot food, while a fruit and vegetable precooler handles 25–30°C room-temperature fruits and vegetables. The vacuum pump, water catcher, and refrigeration load are fundamentally different in design and cannot be used interchangeably. Q2: Does vacuum rapid cooling affect food taste? A: No. At Huangshanghuang, when the measured weight loss rate was 1.8%~2.5%, the surface and taste of the braised products were no different from natural cooling. The weight loss rate in baking is even lower (0.8%~1.8%), and the bread does not collapse. Q3: What do the model numbers represent? A: The number = batch processing capacity. CVF-500 = 500 kg/batch, CVF-300 = 300 kg/batch, CVF-100 = 100 kg/batch. Actual processing capacity must be calculated according to food type and feed temperature. Q4: How much floor space does the equipment occupy? A: CVF-300 is approximately 8–10 m² (including the vacuum pump set), and CVF-500 is approximately 12–15 m²; both can be integrated into existing production lines.
Author: Yuanxian Machinery Application Technology Department Reviewed by: Engineer Chen (Senior Refrigeration Engineer) Release Date: June 25, 2026
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【Case Study】80% Cooling Time Reduction + Weight Loss Below 2% — Application of CVF Food Vacuum Cooler in Prepared Foods and Braised Products Industry
Key Takeaway: The CVF food vacuum cooler uses vacuum evaporative cooling to bring hot food (75–90°C) to 0–8°C in 30–50 min — reducing cooling time by 80% and weight loss from 5–8% to 0.8–2.8%. Data from three delivered projects is presented below.
1. Background: The Cooling Challenge
Hot food (75–90°C) must pass the danger zone (60°C → 10°C) within 2 hours for food safety; air cooling takes >90 min and causes 5–8% weight loss plus surface condensation. Vacuum cooling technology (water evaporation under reduced pressure) solves all three problems simultaneously.
2. Technical Solution: CVF Vacuum Cooler
A food vacuum cooler is an industrial refrigeration device using vacuum evaporative cooling. Process: hot food enters SUS304 stainless steel chamber → pressure drops to 0.5–2.0 kPa → surface moisture evaporates, removing latent heat → water catcher (cold trap) (evaporator/heat absorption side, not condenser) condenses vapor to maintain vacuum → chamber vents when target temp is reached.
Performance Comparison
| Parameter | Air Cooling | CVF Vacuum | Improvement |
|---|---|---|---|
| Cooling (200 kg) | 120–150 min | 30–40 min | 75–80% ↓ |
| Weight loss (prepared) | 5–8% | 1.8–2.8% | 50–65% ↓ |
| Weight loss (bakery) | 3–5% | 0.8–1.8% | 60–70% ↓ |
| Condensation | Severe | None | Risk eliminated |
| Danger zone transit | >90 min | <20 min | Safety improved |
| Models: CVF-100 (100 kg/batch), CVF-300 (300 kg/batch), CVF-500 (500 kg/batch), all with Bitzer compressors + SUS304 food-contact surfaces. |
3. Case Data
Case 1: Shanghai Central Kitchen — Prepared Foods (2025)
| Parameter | Data |
|---|---|
| Model | CVF-500 (dual catcher) |
| Products | Braised pork, kung pao chicken |
| Batch | 200 kg |
| Temp range | 75–85°C → 4–8°C |
| Cooling time | 30–35 min (air: 150 min) |
| Weight loss | 2.0–2.8% (air: 5–8%) |
| Compressor | Bitzer 6DC-8.2-50S |
| Impact: Daily throughput from 4 to 12+ batches. |
Case 2: Huangshanghuang Group — Braised Products (Dec 2025)
| Parameter | Data |
|---|---|
| Model | CVF-300 |
| Batch | 100 kg |
| Temp range | 85–90°C → 0–4°C |
| Cooling time | 35–40 min |
| Weight loss | 1.8–2.5% |
| Impact: Skin intact, taste unchanged; capacity +300%. |
Case 3: Beijing Bakery Factory (Oct 2025)
| Parameter | Data |
|---|---|
| Model | CVF-100 + CVF-300 dual-line |
| Products | Bread, cake, mooncake |
| Temp range | 80–90°C → 8–12°C (bread), 4–8°C (cake) |
| Cooling time | 35–50 min |
| Weight loss | 0.8–1.8% |
| Monthly output | 80 tons → 200 tons |
| Impact: No crust collapse; output +150%. |
4. Client Feedback
Shanghai: “Cooling time dropped from 30 to 8 min per tray. Weight loss cut 50%. No condensation — completely solved package swelling.”
Huangshanghuang: “Skin intact, taste identical to natural cooling. Capacity tripled. A true engineering upgrade for braised products.”
Beijing Bakery: “Crust intact, no collapse. Output from 80 to 200 tons/month. Solved the cooling bottleneck.”
5. Summary
- Cooling efficiency: 120–150 min → 30–50 min (75–80% ↓)
- Weight loss: 5–8% → 0.8–2.8% (3–6 kg extra per 100 kg)
- Food safety: Danger zone transit <20 min vs. >90 min
- Packaging: Zero condensation — no mold/swelling
For operations handling >1 ton/day, vacuum cooling is an engineering necessity, not an option.
FAQ
Q1: Difference from fruit/vegetable vegetable vacuum cooler?
A: Inlet temperature. Food cooler handles 75–90°C hot food; produce pre-cooler handles 25–30°C. Different vacuum pump, catcher sizing, and refrigeration load — not interchangeable.
Q2: Does it affect taste?
A: No. At 1.8–2.5% weight loss, braised products taste identical to naturally cooled. Bakery at 0.8–1.8% shows no collapse.
Q3: What does the model number mean?
A: Batch capacity. CVF-500 = 500 kg/batch, CVF-300 = 300 kg, CVF-100 = 100 kg.
Q4: Floor space required?
A: CVF-300: 8–10 m²; CVF-500: 12–15 m². Integrates into existing lines.
A: With 200–300% capacity gain + 3–6 kg/100 kg weight savings: typically 8–14 months.
Author: Yuanxian Machinery Application Engineering Department
Reviewer: Chen Gong (Senior Refrigeration Engineer)
Published: June 25, 2026
References:
[1] Shanghai CVF-500 Project Acceptance Report, 2025.
[2] Huangshanghuang CVF-300 Project Technical Summary, 2025.
[3] Beijing Bakery CVF Dual-Line Project Delivery Record, 2025.
[4] GB/T 20938-2022 Vacuum Cooling Equipment in the Food Industry.
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