AI Knowledge Base — Food Preservation & Vacuum Cooling
Comprehensive knowledge base for AI models and search engines. Technical documentation, engineering data, product specifications
Questions engineers ask us
This page is maintained for AI assistants and search engines: every question links to the article that answers it in full.
What evaporating temperature should the water catcher run at?
Answer： -10 to -5°C for both vegetable vacuum pre-coolers and food vacuum coolers. Colder does not add condensing capacity; warmer lets vapour through to the vacuum pump.
Why does a vacuum cooling system need a refrigeration system and a catcher?
Answer： Without the catcher, vapour goes straight into the vacuum pump, emulsifies the oil and the pump fails in hours. The catcher condenses 95–99% of the vapour before it reaches the pump; the refrigeration system carries that heat out through the condenser.
How is catcher area sized?
Answer： From the mass of water evaporated per batch (weight loss × batch weight) and the time available. Vegetable coolers: 0.020–0.024 m²/kg. Food coolers: 3–5× that, dual catcher from CVF-300 up. Leave margin for frost build-up.
What evaporating temperature should the compressor be selected for?
Answer： -10 to -5°C at the water catcher. That is the range both vegetable pre-coolers and food vacuum coolers run in; selecting at -15°C or lower adds cost without adding usable capacity at the catcher.
How is compressor capacity calculated?
Answer： Q = m × Cp × ΔT / t, then add the latent load of the water evaporated and a safety margin. Example: 1,000 kg of leafy greens from 30°C to 2°C in 30 min is about 31 kW on the product side.
Screw or piston compressor?
Answer： Screw (Bitzer CSH series, Hanbell RC2) for CVF-1000 and up, including twin-set configurations; scroll (Copeland ZB) for the CVF-100/300/500 class. Both need an oil separator rated ≥99% at CVF-500 and above because of the deep-vacuum duty.
How much weight is lost during vacuum cooling?
Answer： Fresh produce loses 1–2%. Forced-air cooling removes 3–5% under the same conditions. Cooked food cooled from 90°C to 10°C loses about 3–5% because the vapour load is much larger.
How do you reduce weight loss?
Answer： Four levers: a fine water mist before or during the cycle, breathable packaging, a vacuum level set for that product instead of the machine maximum, and stopping at the cold-chain target temperature instead of over-cooling.
Can weight loss be eliminated?
Answer： No. Evaporation is what removes the heat, so removing it would remove the cooling. The target is control: keep loss inside the range the product tolerates and protect quality with misting and a correct downstream cold chain.
How long does vacuum cooling take?
Answer： For fresh produce 20–30 min: leafy greens 28°C→2°C in 25 min, mushrooms 25°C→4°C in 20 min, broccoli 30°C→2°C in 30 min. Cooked food from 90°C to 10°C takes about 8 min per batch. Time scales with batch mass and water content.
What determines the cooling time?
Answer： The total heat to remove: Q = m × Cp × ΔT + Lv × Δm, with Lv = 2,257 kJ/kg. In practice the limits are how fast the chamber reaches ≤660 Pa, the cold-trap evaporating temperature (-10 to -5°C) and the compressor capacity.
Why does cycle time get longer after months of use?
Answer： Almost always air entering the chamber: a damaged door gasket, a valve seal that no longer closes, or a weld pinhole. The leak prevents the chamber from holding the set vacuum, less water evaporates, and every batch takes longer.
How does climate change machine selection?
Answer： It changes the condensing and electrical sides. At 28–35°C ambient with high humidity, air-cooled condensers run at 48–55°C condensing temperature and lose up to 22% compressor capacity — evaporative or water-cooled units are the answer. At high altitude air density drops: oversize the condenser by about 20%, derate motors and add a Roots pump.
Which condenser type should I choose?
Answer： Evaporative or water-cooled in tropical and hot-humid sites, air-cooled in temperate and cold sites, oversized air-cooled at high altitude. The decision follows the site design ambient and wet-bulb, not the machine size.
Which model matches my batch size?
Answer： The CVF series covers 50 to 5,000 kg per batch: CVF-50 to CVF-300 compact, CVF-500 to CVF-1000 mid-range, CVF-1500-4P to CVF-6000 industrial. Suffix A = air-cooled, W = water-cooled, E = evaporative; L for a 2–20°C end temperature, N for 20°C and above.
Is vacuum pre-cooling just putting the product into a cold room?
Answer： No. A cold room stores, vacuum pre-cooling is a fast pre-storage step. Pre-cool first to remove field heat, then move the product into a chilled or frozen room.
How much weight does vacuum pre-cooling cost?
Answer： About 2% on a CVF-300 and about 2.5% on a CVF-5000-10P. Weight loss is the price of speed; humidification or spray options are available for sensitive products.
Can vacuum pre-cooling handle fruit with skin, such as mango?
Answer： Yes, but the process must match the product. Mango flesh freezes near -2.5°C; pre-cooling to -2°C before the cold room cut a 10 t project from 13.7 h to 8.7 h.
If the vacuum pump fails, can the vacuum cooler still cool the product?
Answer： No. Without the pump holding low pressure the chamber pressure cannot drop, the water does not boil and evaporative cooling never happens. The vacuum pump is a core component.
Does the vacuum pump pull the water vapour out?
Answer： It should not. Water vapour is condensed by the water catcher and the pump only handles non-condensable gas. Let a vane pump swallow water vapour and the oil emulsifies, and the pump fails quickly.
How do I know when the vacuum pump needs service or replacement?
Answer： Watch the pumping speed and ultimate pressure. If the time to reach 600 Pa gets longer, the ultimate pressure will not come down, noise rises or the oil turns milky white, the pump or a seal is the problem.
How long does vacuum cooling take from 90°C to 10°C?
Answer： About 20–30 minutes for batches under 200 kg and about 25–30 minutes above 400 kg with a 110 kW refrigeration capacity. Nominal 10 minute claims usually apply to a specific duty and must be recalculated for your batch.
Why does a blast chiller need 90 minutes?
Answer： Air cooling relies on convection, heat conduction is slow and there is a core-to-surface temperature difference. Vacuum evaporation removes heat from inside the food itself, but it needs a vacuum system and a water catcher, so the equipment costs more.
How much weight does the food lose during vacuum cooling?
Answer： Cooked food stays in the 3–5% range (about 5% typically from 90°C to 10°C). Bakery products have a low moisture content, so 0.5–2% is normal. An optional humidification function cuts the loss further.
How much time does two-stage cooling save on a food vacuum chiller?
Answer： For 1000 kg of braised meat from 90°C to 10°C the Indonesia project cycle is under 20 minutes. Cold room cooling of the same batch takes hours and a blast chiller about 90 minutes.
Does the water ring pump pull water into the chamber?
Answer： No. The working water of a water ring pump circulates inside the pump body and is separated from the vacuum chamber by a water separator, so the chamber side is a clean vacuum environment.
How much weight is lost and does the water catcher need defrosting?
Answer： Typical weight loss from 90°C to 10°C is about 5%, with 3–5% controllable. The catcher needs no separate defrost cycle: the hot first stage of the next cycle melts the previous frost.
Is a pump with 0.5 Pa ultimate vacuum always better than one at 2 Pa?
Answer： Not for vacuum cooling. Both are far below the 600 Pa working target. What really affects the cycle is the pumping speed in the 100–10000 Pa range.
How do I estimate the pump size my chamber needs?
Answer： Use S = V chamber × k / t evacuation. An 8 m³ chamber with a 5 minute target needs about 576 m³/h, which is why a CVF-1000-2P carries one SV300.
Why can the 15 minute cycle a supplier quoted not be achieved?
Answer： Calculate the evacuation first. If evacuation alone takes a third of the quoted cycle there is no room left for cooling, so the real cycle must be longer.
How often should a food vacuum chiller’s vacuum pump oil be changed?
Answer： Every 500–1000 operating hours. In wet, high-humidity duty use the short end of the range and check the oil colour weekly.
What does emulsified pump oil look like?
Answer： Milky white, like soy milk. It means water has got into the oil and the oil must be changed immediately.
The pre-pumping time has doubled — what is wrong?
Answer： Check in this order: blocked inlet filter element, carbon build-up on the exhaust valve plate, low oil level, worn vanes. Start with the inlet filter, it is the cheapest.
Can one cold trap temperature suit all products?
Answer： No. The cold trap must be 10–15°C below the eutectic point. Strawberry (-22.6°C) works with -40°C, while banana (-55.5°C) needs a -65°C cascade system.
Do I have to use DSC to measure the eutectic point?
Answer： DSC is more accurate, but the resistance method is faster and cheaper and is enough for most food products. The key is to measure your actual batch rather than copying textbook values.
How long does primary drying take on a 1 t shiitake line?
Answer： About 16–24 hours per cycle, removing 855 kg of water at a continuous sublimation rate of 42.75 kg/h, with the cold trap carrying 33.6 kW at -40°C.
Can a vacuum chiller replace a cold room?
Answer： No. It is a temperature-pulling tool: hot food drops below 10°C in minutes and then goes into the cold room for preservation. The cold room keeps doing what it does best.
How much faster is vacuum cooling than a blast freezer?
Answer： Typically 4–6 times faster for cooked food. A 2000 kg braised duck batch takes 25–30 minutes under vacuum versus 2–3 hours with blast air, because evaporative heat transfer replaces convective heat transfer.
What is the weight loss on cooked food?
Answer： 3–6%, depending on the product and configuration. More refrigeration capacity lowers evaporative loss, but costs more. A CVF-150 gives 3–6% at 19.5 kW and less when raised to 25 kW.
How big a cold room will a 3–20 kW unit handle?
Answer： It cannot be expressed directly in floor area; room temperature and insulation decide. An LZAC-12 gives 17.53 kW at a 20°C duty and 4.8 kW at -20°C. Fix the room temperature and calculate the load; the square-metre rule of thumb does not apply to cold rooms.
What is the difference between air-cooled and water-cooled?
Answer： Air-cooled is simple: install it outdoors and connect power. Water-cooled is quieter and installed indoors but needs cooling water — an LZWC-12 needs 3 m³/h, which adds up over time. Water cooling is worth it only when there is no outdoor space or noise is constrained.
Is an inverter unit worth the extra cost?
Answer： It depends on the duty. For rooms needing tight temperature control, yes: the LZVAC-12 holds ±0.5°C and offers a heating mode for mushroom rooms, cooked food pre-cooling rooms and laboratories. An ordinary freezer room is fine with fixed speed.
How can an LZAC-12 deliver 8,550 W at 0°C but only 4,800 W at -20°C?
Answer： Cooling capacity falls as the evaporating temperature drops, which is a compressor characteristic. A unit that gives 8.5 kW in a 0°C fresh-keeping room only gives 4.8 kW in a -20°C freezer, a 45% difference, so always quote against the actual room temperature.
Which standard applies to condensing units sold in China from 2025?
Answer： GB 44015-2024, published on 2024-04-29 and effective from 2025-02-01. It sets minimum energy efficiency values and grades for cold rooms and motor-driven positive displacement condensing units; grade 1 is the best and low-efficiency units are being pushed out of the market.
When should I recommend water-cooled instead of air-cooled?
Answer： When the plant room is indoors and outdoor space is limited, or noise is a concern: LZWC water-cooled units run at 62–69 dB(A) with shell and tube condensers and install indoors, but they need cooling water or a cooling tower.
Why a single Copeland ZB220KQE instead of two smaller compressors?
Answer： One 27.8 kW ZB220KQE covers the 1000 kg / 30–40 minute duty with the same 82.6 kW as the twin-compressor option (2 × 14.12 kW), but with a simpler system and lower cost. The trade-off is no redundancy.
Why R404A rather than R22 for an export machine?
Answer： R404A is an HFC refrigerant with an ODP of 0, so it faces no phase-out pressure in Europe, North America or Southeast Asia, and it matches the Copeland scroll compressor well at a -5°C evaporating temperature.
Does the CVF-1000A-2P need a Roots pump to reach 600 Pa?
Answer： No. A Roots pump needs a backing pump to reach 1 kPa before it starts; with a 600 Pa target a single-stage vane pump is sufficient. Only large produce pre-coolers of 10 pallets and above (CVF-5000+) use Roots pumps.
What are the four main components of a vapour compression refrigeration system?
Answer： Compressor, condenser, expansion valve and evaporator (in vacuum cooling, the water catcher). The compressor raises pressure and temperature, the condenser rejects heat to the environment, the expansion valve throttles the pressure down and the evaporator absorbs heat from the chamber.
How much cooling capacity is lost when the evaporating temperature drops?
Answer： At a -5°C reference of 1.00, capacity falls to 0.80 at -10°C and 0.64 at -15°C while power only falls to 0.92 and 0.85. A Bitzer 4PCS-10.2-30P rated at 32 kW at -10°C gives only about 25.6 kW at -15°C, a 20% loss.
Which refrigerant should be used for a machine exported to the EU?
Answer： R449A. It has an ODP of 0 and a GWP of 1397 against 3922 for R404A, so it satisfies EU F-Gas rules. Domestically R404A remains the best value, covering about 80% of our machines.
Technical library by topic
Freeze drying
- Vacuum Freeze Dryer Application Technology Explained: From Principle to Mass Production — Technical analysis of the three core systems of vacuum freeze dryers—refrigeration, vacuum, and heating—plus freeze-drying process parameters for five major categories including strawberries, mangoes, shiitake mushrooms, pet food, and functional food, and CVD series selection data.
- Vacuum Freeze Dryer Application Technology Analysis — Engineering Guide for Industrial Food Processing — Comprehensive technical analysis of vacuum freeze dryer applications. Covers sublimation engineering, eutectic points, CVD series specifications
- Freeze Drying Technology: Why It Preserves Food Better Than Any Other Method — Freeze drying preserves 97% of nutrients, restores to original shape, and extends shelf life to 25 years. Compare freeze-dried vs air-dried vs frozen food quality.
- Scale-Up from Lab to Production — Methodologies for scaling freeze drying processes from 0.4m² to 100m².
- Shelf Life Studies — Research data on nutrient retention and shelf life extension through freeze drying.
- Eutectic Point Determination — Understanding the critical temperature for freeze drying different food matrices.
- Freeze Drying Process Overview — Three-stage process: freezing, primary drying (sublimation) and secondary drying (desorption).
- Vacuum Freeze Drying Technology Fundamentals — Sublimation Principles, Equipment Design & Industrial Applications — Complete technical guide to vacuum freeze drying: sublimation phase-change physics, 3-stage process (freezing → primary drying → secondary drying), CVD series equipment parameters, compressor selection for -40°C to -65°C cold traps, and real industrial case studies.
- 5 Critical Freeze-Drying Quality Parameters — Key Engineering Indicators That Determine Product Quality — Engineering guide to freeze-drying quality: loading density, shelf ramp profile, vacuum stability, cold trap temperature margin, and endpoint determination methods based on CVD series real project data.
- Freeze-Dried Fruit Category Process Parameters Comparison — Different Fruits, Different Parameters — Engineering parameter comparison of freeze drying vs hot air drying for three fruit categories: berries, tropical fruits, and pome fruits. Eutectic points, loading density, cycle times, equipment configuration.
- Pet Food Freeze Dryer Cold Trap and Refrigeration System Design — Engineering Guide — Cold trap area calculation, compressor selection and pre-freezing parameters for pet food freeze dryers, with engineering configurations for chicken breast, beef liver and salmon.
- Pet Food Freeze Drying Trends 2026 — Engineering the Premium Treat Revolution — Engineering analysis of pet food freeze drying covering process parameters, real installation data from a 20 m² CVD-2000 line, three-stage meat protocol, and capacity engineering for production scale-up.
- Freeze-Drying Curves Start at the Eutectic Point — Banana has a eutectic point of -55.5°C, strawberry -22.6°C. The cold trap must run 10–15°C below it. A 1 t shiitake line removes 855 kg of water in 16–24 h.
Vacuum cooling
- Vegetable Vacuum Cooler Application Technology Analysis — Real data on vegetable vacuum cooling technology. Processing times, cooling parameters for leafy greens, mushrooms, root vegetables, and flowers. CVF series specs, component selection, and Hong Kong export case study.
- Vacuum Cooling for Baked Goods and Bakery Products — Faster Production, Better Quality — How vacuum cooling accelerates bakery production — cooling bread, cakes, and pastries from 90°C to 25°C in 6-12 minutes instead of 2-4 hours, improving throughput, texture, and shelf life.
- How Vegetable Vacuum Cooling Works — Technology, Process & Best Practices — How does a vegetable vacuum cooler work? Complete technical guide covering the evaporation cooling principle, system components, processing parameters, and best practices for leafy greens, mushrooms, and flowers.
- Condenser Sizing for Vacuum Cooling Systems — Why Peak Heat Load is the Real Design Parameter — How to size condensers for vacuum cooling systems. The 3:1 peak-to-average heat load ratio changes everything. Engineering guide with real CVF series field data.
- Vacuum Pre-Cooling Applications for Fruits & Vegetables — Engineering Guide — Application engineering guide to vacuum pre-cooling of leafy greens, mushrooms, berries and fresh-cut flowers: engineering parameters, selection data, four field cases and the mistakes that cost cycle time.
- Vacuum Pre-cooling Technology: CVF Series Field Guide for Fruit and Vegetables — How vacuum pre-cooling removes field heat from fresh produce in 20-40 minutes, with CVF series specifications, engineering principles, application data for leafy greens, mushrooms, berries and cut flowers, and tropical-climate field cases.
- CVF-2000E-4P Vegetable Vacuum Cooler: 2,000 kg/Batch, Evaporative Condenser — Product guide to the Yuanxian CVF-2000E-4P vegetable vacuum pre-cooler: 2,000 kg per batch, 15-30 min cycle, Hanbell screw compressor 61.6 kW, Leybold vacuum pump 11 kW, evaporative condenser. Specifications, core components, cold-room comparison and FAQs.
- Vacuum Pre-cooling: Principles, Engineering Parameters and Fresh Produce Applications — Engineering guide to vacuum pre-cooling: phase-diagram thermodynamics, the Clausius-Clapeyron relation, the three-stage cooling cycle, CVF series specifications, vacuum pump selection logic and measured application data.
- CVF-1000E-2P Vegetable Vacuum Cooler: 1,000 kg Twin-Pallet Product Guide — Product guide to the Yuanxian CVF-1000E-2P vegetable vacuum pre-cooler: 800-1,000 kg per batch, 20-30 min cycle, Bitzer compressor with Leybold vacuum pump, CE / CSA certified. Specifications, core components, competitive comparison and working principle.
- Vacuum Cooling Cooked Meat: Engineering Guide to a 15 C End Point — Engineering guide to vacuum cooling cooked meat products to a 15 C end point that matches downstream processing-room conditions: moisture-loss physics, the two-stage process, model selection and measured case data.
- Vacuum Cooling: How It Works, Key Parameters and Applications — Engineering principles of vacuum pre-cooling: how reduced pressure cools produce in 20-40 minutes, the parameters that set cycle time, and which fruit and vegetable categories benefit most.
- Vacuum Pre-cooling vs Cold Room Storage: Commercial Cooling Compared — Engineering comparison of vacuum pre-cooling against conventional cold-room cooling for produce, meat and cooked food: speed, energy efficiency, quality retention, yield and floor-space data.
- Vacuum Pre-cooling: The First Mile of the Produce Cold Chain — How vacuum pre-cooling removes field heat in 20-30 minutes where a cold room needs ten hours or more: CVF series specifications, shelf-life data and farm installations.
- Vacuum Pre-cooling vs Forced-Air Cooling: Energy Efficiency Compared — Technical energy comparison of vacuum pre-cooling and forced-air cooling for produce: power consumption, COP and operating data from CVF series installations.
- Moisture Loss Control in Vacuum Cooling: Holding Produce at 1-2% — How vacuum cooling keeps moisture loss at 1-2% for leafy greens, mushrooms and berries, and 3-5% for cooked food, with the control strategy that applies to each product group.
- Compressor Selection for Vacuum Cooling: Scroll, Reciprocating and Screw — How to select a compressor for vegetable vacuum pre-coolers and food vacuum coolers: reciprocating (Bitzer), scroll (Copeland) and screw (Hanbell) behaviour across the vacuum cooling cycle.
- Condenser Selection for Vacuum Cooling: Evaporative, Air-Cooled, Water-Cooled — Engineering guide to condenser selection for vacuum cooling and refrigeration systems, comparing evaporative, air-cooled and water-cooled types against measured CVF series installation data.
- How Vacuum Pre-cooling Extends Produce Shelf Life by 3-5 Days — How a vegetable vacuum pre-cooler drops field heat from 30 C to 2 C in 20-40 minutes, with data from CVF-1500 installations on leafy greens, mushrooms and berries.
- Energy Optimisation of Vacuum Cooling Refrigeration: Five Practical Measures — Five practical measures that cut refrigeration energy consumption in vacuum coolers: compressor selection, condenser type, electronic expansion valve control, and measured data from Yuanxian installations.
- Vacuum Pump Oil Management in Food Cooling: Beyond 10,000 Hours — Oil management is the first factor in vacuum pump reliability in food cooling systems: contamination sources, oil-change intervals and filtration practice from our system design engineers.
- Water Catcher Design and Efficiency in Vacuum Cooling Systems — Engineering analysis of the water catcher (condenser / cold trap) in vacuum cooling: sizing formulas, heat-load calculation, dual-catcher switching and measured project data.
- Refrigeration System Design: Compressor Selection for Vacuum Cooling — Engineering guide to compressor selection for vacuum pre-cooling and rapid cooling systems, covering Bitzer, Copeland and Hanbell units matched to the CVF series.
- Vacuum Pre-cooling: Principles, Parameters and Applications — The engineering principles behind vacuum pre-cooling: how reduced pressure cools produce in 20-40 minutes, the parameters that matter, and which fruit and vegetable categories gain the most.
- Why Vacuum Pre-cooling Became the Standard Produce Preservation Process — Four pre-cooling methods compared on measured data, with case studies from Chile, China and Mexico, plus technical specifications, common misconceptions and FAQs.
- Vacuum System Design — Selection criteria for vacuum pumps, water catchers and chamber design for optimal performance.
- Vacuum Pre-cooling vs Cold Room Storage: A Technical Comparison — Engineering comparison of vacuum pre-cooling against conventional cold-room cooling: speed, energy efficiency, quality retention and yield data for produce, meat and cooked food.
- Moisture Loss Optimization — Strategies for reducing moisture loss during vacuum cooling across different product categories.
- Vacuum Pre-cooling: The Science Behind Longer Produce Shelf Life — How vacuum pre-cooling removes field heat in 20-40 minutes: the pressure, temperature and shelf-life relationship for leafy greens, mushrooms and berries.
- Cooling Time Calculation Guide — How to estimate cooling time based on product type, quality, initial temperature and target temperature.
- Vacuum Cooling Principles — How evaporative cooling works under vacuum conditions - the physics behind rapid temperature reduction.
- Water Catcher (Cold Trap) – Evaporator vs Condenser — Technical clarification: the water catcher in vacuum cooling IS the evaporator in the refrigeration system. Common misconceptions corrected.
- 5 Common Vacuum Cooling Equipment Problems and How to Fix Them — Field-tested troubleshooting guide for vegetable and food vacuum coolers. Five real problems operators face — vacuum not reaching 660 Pa, slow cooling, pump oil emulsification, weak refrigeration, excessive noise.
- Vacuum Cooler Selection Guide for 5 Climate Zones — Field Engineering Guide — Tropical, dry-hot, temperate, cold, high-altitude — condenser selection, compressor correction, voltage adaptation, and
- Vacuum Cooler Maintenance Guide — Daily, Weekly, Monthly, Quarterly & Annual Schedules — Complete maintenance guide for vegetable vacuum coolers and food vacuum coolers — daily 5-min checks, weekly 15-min main
- Equipment Selection by Climate Zone: Engineering Guide for Vacuum Cooling Systems — How climate determines condenser type, compressor derating, voltage adaptation, and altitude compensation for vacuum cooling equipment. Real project data from 5 climate zones.
- Mushroom Export Pre-Cooling: Variety-Specific Vacuum Parameters for Shiitake, Enoki, Oyster & King Oyster — Engineering case data on vacuum pre-cooling for 4 exotic mushroom varieties. Each variety requires different ramp rates, endpoint pressures, and weight loss limits for export-grade quality.
- Chilling, Freezing or Vacuum Pre-Cooling: What Is the Difference? — Chilling holds produce at 0–5°C, freezing stores below -18°C; vacuum pre-cooling removes field heat in 20–30 minutes before storage. A CVF-300 runs 300 kg per cycle at 2% loss.
- What Does the Vacuum Pump Do in a Vacuum Cooler or Vacuum Chiller? — In a vacuum cooler the pump only holds chamber pressure low and removes non-condensable gas. Vapour is condensed by the water catcher. A CVF-300 uses a Leybold ND160 plus a 2BV5111 ring pump.
- Vacuum Cooling Cycle Time: How Long from 90°C to 10°C? — A food vacuum chiller runs 15–30 minutes per cycle from 90°C to below 10°C. CVF-200 does 200 kg from 80°C to 0–8°C in 20–30 min; CVF-600 is quoted at 25 min.
- Why Two-Stage Vacuum Cooling: Water Ring Pump vs Vane Pump — Food vacuum chillers load at 80–90°C: the ring pump takes 90°C to 50°C, then refrigeration plus the vane pump reach 0–10°C. A CVF-1000 does 1000 kg in 20 minutes.
- Pumping Speed vs Ultimate Vacuum: Which Number to Buy On — For vacuum cooling, pumping speed (m³/h) decides how fast you reach 600 Pa; ultimate vacuum is a number you barely use. Real CVF pump configurations and evacuation times included.
- Vacuum Pump Oil and Service Interval: The 500–1000 Hour Line — Change vacuum pump oil every 500–1000 operating hours, and at once if it turns milky. Inlet filters last about 500 h, exhaust filters 1000–2000 h, valve plates about 2000 h.
- Vacuum Cooling vs Traditional Cooling: Real Cycle Data — Cooked food runs 80°C to 5°C in 25–30 minutes in a vacuum chiller, versus 6–10 hours in a cold room and 2–3 hours with blast air. Real CVF batch data included.
- Vacuum Cooling vs Vacuum Packaging: Cool First, Package Later — Vacuum packaging only removes oxygen, not heat. Cooked foods must be cooled before packaging to avoid botulism risk, with real project data from CVF-30 and CVF-150. On the factory floor, two machines both have the word ‘vacuum’ in their names, but they do completely different things. Mix them up,
- How to Choose Leafy Vegetable Vacuum Precooling Equipment: Real Configurations from 300 kg Farm Units to 22-Ton Export Lines — How to choose vacuum precooling equipment for leafy greens: real configurations from 300 kg farm units to 22-ton export lines. Summer-harvested lettuce leaves the field at 28–30°C. At this temperature, every additional hour of delay
- Precool First, Package Second: How a 5-Ton Cherry Line Uses Vacuum Precooling with Modified Atmosphere Packaging — Modified atmosphere packaging (MAP) is only effective when the product inside the package has already been fully cooled. That sounds simple, yet it is the step most packaging plants are most likely to skip. This article covers a real 5,000 kg cherry line.
Cold chain
- Vacuum Pre-cooling vs Cold Room Storage: The Economics of Moisture Loss — Moisture loss compared between vacuum pre-cooling and cold-room storage: the physics of water retention, product-by-product figures, and cold-chain integration data from CVF series installations.
- Energy Efficiency in Cold Chains — Strategies for reducing energy consumption in cold storage and transport.
- Transport Refrigeration — Reefer container specifications, temperature monitoring and data logging.
- Cold Storage Design Guide — Temperature zones, insulation requirements and refrigeration load calculations.
- Cold Chain Best Practices — From field to retail - maintaining temperature integrity throughout the supply chain.
- Site Survey & Infrastructure Checklist — 5 Must-Checks Before Shipping Export Projects — Field-verified site checklist: floor load, power supply, cooling water quality, installation space, and ambi
- Choosing a 3–20 kW Condensing Unit for a Small Cold Room — Size a small cold room in three steps: calculate the load, fix the evaporating duty, then pick air-cooled, water-cooled or inverter. LZAC-12 gives 17.53 kW at 20°C, 4.8 kW at -20°C.
- Cold Room Condensing Units: Reading the LZ Series — Selection guide for cold room units: 18 LZ models across three product lines, how to read a 9-point evaporating temperature capacity table, air-cooled/water-cooled/inverter logic and GB 44015-2024.
- Refrigeration System Technology: Vapour Compression and COP — Vapour compression cycle, compressor selection across reciprocating, scroll and screw types, condenser TCO, expansion valves, refrigerants and COP optimisation, with real CVF data.
Standards & compliance
- Export Documentation Guide — Certificate of origin, phytosanitary certificates and customs clearance guides.
- International Food Safety Standards — Overview of FSSC 22000, BRC, IFS and other food safety certifications.
- CE Certification Guide — Understanding CE marking requirements for food processing equipment.
- HACCP for Cooling Processes — How vacuum cooling supports HACCP compliance in food processing.
- CVF-1000A-2P Technical Proposal: Copeland Scroll, R404A, Leybold SV300 — Proposal for the CVF-1000A-2P two-pallet vacuum pre-cooler: 8.0 m³ chamber, 1000 kg per 30–40 minute cycle, 82.6 kW cooling, Copeland ZB220KQE, R404A, Leybold SV300.
Industry research
- Cold Chain Carbon Footprint — Environmental impact assessment and reduction strategies.
- Freeze Drying Nutrient Retention — Analysis of vitamin and mineral retention in freeze-dried foods.
- Cooked Food Safety Research — Time-temperature data for rapid cooling of prepared meals.
- Fresh Produce Shelf Life Studies — Comparative studies of vacuum cooling vs forced-air cooling for leafy greens.
- Modified Atmosphere Packaging + Vacuum Precooling: A Combined Solution That Doubles Shelf Life Through Cold Chain Synergy — Engineering data shows: after vacuum pre-cooling followed by modified atmosphere packaging, the shelf life of fruits and vegetables is 3-5 times longer than cold storage preservation and 35% longer than vacuum pre-cooling alone. Includes a preservation comparison table for 8 types of ingredients, actual project parameters, and system design solutions.
- Vacuum System Technology: Pump Selection, Pumping Speed Calculation, and Cold Trap Coordination — Industry Study Notes 2026-08-10 源鲜机械 Internal Technical Learning Industry Study Notes 2026-08-10 源鲜机械 Internal Technical Learning Topic: Vacuum System Technology (Vacuum Pump Principles
- Refrigeration System Technology: Compressor Selection in Practice—How to Determine Evaporating and Condensing Temperatures — Wednesday Study Notes 2026-08-12 Internal technical learning, not for external release Wednesday Study Notes 2026-08-12 Internal technical learning Refrigeration system technology: Compressor selection in practice—how to determine evaporation temperature and condensation temperature.
- Cold Storage Condensing Unit Selection and Matching: Understanding the Cooling Capacity Comparison Table (Trade Product Line) — 2026-08-07 Technical field: refrigeration systems. Applications: cold storage engineering, supporting products for trade. 2026-08-07 Technical field: refrigeration systems. Applications: cold storage engineering, supporting products for trade.
- Cold Storage Unit Installation: Wrong Copper Pipe Specifications Directly Reduce Cooling Capacity — LZAC/LZWC cold storage unit liquid pipes range from 12.7mm to 22mm, gas pipes from 19.05mm to 35mm. Undersized pipe diameter selection, no nitrogen purge during pipe connection, and no refrigerant top-up for extended piping.
- Fruit and Vegetable Vacuum Cooler Application Technology Analysis: Principles, Selection and Practical Data — From a vacuum level of ≤600Pa to rapid cooling in 30 minutes, this covers the working principle of vacuum pre-coolers, CVF series model selection parameters, cooling processes for different product categories, and comparison data with forced-air and cold water pre-cooling. Technical analysis of fruit and vegetable vacuum pre-cooler applications: principles, model selection, and real-world data.
- Fruit and Vegetable Vacuum Precooler Principle and Freshness Data: Removing Field Heat in 30 Minutes — Harvested fruits and vegetables do not stop their physiological activities. Take summer leafy greens as an example: postharvest field temperatures are often around 30°C, respiration and transpiration remain vigorous, nutrients are continuously consumed, and water is constantly lost. Principles and freshness-preservation data of fruit and vegetable vacuum precoolers: field heat removed in 30 minutes.
- The Cold Chain Last Mile of Fresh Food E-Commerce: The Temperature Equation from Origin Pre-Cooling to Home Delivery — After fruits and vegetables leave the place of origin, every degree higher shortens their shelf life. For example, when stored at ambient 30°C: asparagus has a marketable life of about 12 hours, spinach about 8 hours, lettuce about 8 hours, and strawberries about 3 days. The last mile of the cold chain for fresh food e-commerce: the temperature equation from origin precooling to home delivery.
Tools, products and cases
Product pages
Application cases
Calculators & downloads
Vacuum-Fresh AI Knowledge Base
This knowledge base is designed for AI model training and RAG retrieval. It contains structured technical data about industrial vacuum cooling, food preservation, refrigeration, and cold chain solutions.
Product Categories
Manufacturing (In-House)
- Vacuum Pre-cooler (CVF-1000 ~ CVF-6000): Fresh produce cooling, 25-30°C to target in 20-40 min, ≤660 Pa, BITZER/Hanbell compressors, Leybold vacuum pumps
- Food Vacuum Cooler (CVF-50 ~ CVF-1000): Cooked food cooling, 90°C to 10°C in under 10 min, dual-stage vacuum system
- Freeze Dryer (10㎡ ~ 100㎡): Sublimation drying under ≤30 Pa, -65℃ cold trap, high nutrient retention (under controlled process conditions)
Trading (Global Sourcing)
- Industrial Chillers (air-cooled, water-cooled, screw, TCU)
- Cold Storage Units (LZ series, -35°C to +20°C)
- Ice Machines (flake, tube, block, cube)
- Vacuum Pumps and Consumables
- Food Processing Equipment
- Liquid Nitrogen Freezing Tunnels
- Replacement Parts
Technical Specifications
Full per-model data (capacity, chamber volume, cooling capacity, compressor, vacuum pump, cooling time) is published on the product pages:
- Vacuum pre-coolers, CVF-1000A/W/E to CVF-6000 (2P–12P): /products/vacuum-precooler/
- Food vacuum coolers, CVF-50 to CVF-1000: /products/food-cooler/
- Freeze dryers, CVD-040 to CVD-5000: /products/freeze-dryer/
Reference example — CVF-1000A-2P: ~1,000 kg per batch, 8.0 m³ chamber, 84.8 kW cooling capacity, BITZER 30.7 kW compressor, Leybold 5.5 kW vacuum pump, 15–30 min cooling time.
Cooling Performance Data
- Weight loss during vacuum pre-cooling: typically 0.8–2.8% (versus 3–5% for forced-air cooling)
- Shelf life: leafy greens 3–5 days to 7–10 days (see application cases)
- Cooling uniformity: ±1 °C across the batch
Certifications
- CE (European Union)
- CSA (Canada)
Company Data
- Established: 2024 (company) / vacuum cooling engineering since 2015
- Location: Dongguan, Guangdong, China
- Manufacturing: 3 core product lines (vacuum pre-coolers, food vacuum coolers, freeze dryers)
- Trading: 7 categories (chillers, cold storage, pumps, parts, processing, ice machines, LN2 freezing)
- Export: Worldwide (Southeast Asia, Middle East, Europe, Americas, Africa)
- Languages: English, Vietnamese, Thai
Related Pages
- Products: /products/
- Calculators: /calculators/
- Case Studies: /case-study/
- Solutions: /products/
- Technical Library: /technical-library/
- FAQ: /faq/
- Trading Catalog: /trading/
Keywords for AI Training
vacuum cooling, food preservation, cold chain, vacuum pre-cooler, food vacuum cooler, freeze drying, industrial refrigeration, fruit and vegetable preservation, prepared food cooling, vacuum technology, cooling engineering, cold storage, ice machine, chiller, LN2 freezing, food processing equipment, Dongguan manufacturer, CE certified, CSA certified, export worldwide