Application

Vacuum pumps for vacuum cooling

In vacuum cooling, the pressure above the warm product is lowered until its water evaporates – and evaporating water removes heat, as Becker describes it for bakery products. Leybold names rapid cooling above all for leafy vegetables, and also for sushi rice and bread; Becker names cooling times that are 20–40% shorter. Below you can see how the application works, what vacuum the manufacturers name and which of their series are intended for it – 310 models from 5 manufacturers.

Compare 310 modelsHow it works

  • 310Models
  • 17Series
  • 5Manufacturers
  • 20–40 %shorter cooling time for bakery products (Becker)
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Touch the points: each part of the system explains itself.

In short

Vacuum cooling: the key facts

  • Evaporation coolsBecker describes the principle of the vacuum cooling of bakery products in one sentence: evaporating water removes heat.
  • 20–40% shorterFor the vacuum cooling of bakery products, Becker names cooling times that are 20–40% shorter and the series U and U4 with RBP for it, and VADS where needed in the line periphery.
  • Vegetables, fruit, breadLeybold names rapid cooling above all for leafy vegetables, and also for sushi rice and bread; Atlas Copco names the vacuum cooling of vegetables, fruit and flowers.
  • ManufacturersAtlas Copco, Becker, Busch, Edwards, Elmo Rietschle and Leybold list vacuum cooling. Edwards names it as rapid cooling in food processing, Elmo Rietschle as cooling in the chemical industry, both without a description.
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  • Air and gas (vacuum)
  • Exhaust

Operating principle

How it works: Vacuum cooling

The drawing shows the basic principle in section. The systems and pumps of the individual manufacturers differ in detail.

  1. LoadingThe warm product – bakery products straight from the oven, vegetables after harvest – goes into the vacuum cooler, and the chamber is closed.
  2. EvacuationThe vacuum pump lowers the pressure. Under vacuum, the water in the product evaporates at a low temperature, and evaporating water removes heat (Becker).
  3. VentingOnce the target temperature is reached, the chamber is vented and the cooled product is removed. Becker names cooling times that are 20–40% shorter.

Vacuum and sizing

Vacuum cooling: how much vacuum is needed

What the manufacturers say about pressure, pumping speed and sizing.

Which vacuum

For bakery products, Becker names cooling times that are 20–40% shorter. Which pressure a system runs at depends on the product and the target temperature: the lower the pressure, the lower the temperature at which the water in the product evaporates.

Which pumps

Becker names U and U4 (oil-lubricated rotary vane) with the Roots pump RBP, plus VADS in the line periphery. Leybold names SOGEVAC (oil-lubricated rotary vane), NOVADRY and DRYVAC (screw vacuum pumps), Atlas Copco GHS VSD+ and DWS VSD+ (screw) with the Roots pump DRB, Busch R5, COBRA, DOLPHIN and PANDA/PUMA, Edwards LR1A, LR1C and LR1D (liquid ring).

What determines the sizing

Becker and Atlas Copco name pump systems made up of a backing pump and a Roots pump (U/U4 with RBP, GHS 1202–2002 with DRB): the Roots pump increases the pumping speed at low pressure when the water vapour from the product has to be removed in large quantities.

What the manufacturers point out

The manufacturers name different products: bakery products (Becker; Leybold lists baking and cooling for DRYVAC DV FP-r), leafy vegetables, sushi rice and bread (Leybold), vegetables, fruit and flowers (Atlas Copco). In all of them, water vapour is produced, which the pump has to remove as well.

Technology

Vacuum cooling: the vacuum pumps the manufacturers name

Listed are the series the manufacturer itself names for this application. “Show only …” sets the filter of the product overview.

Elmo Rietschle names the application without naming a series for it.

Product overview

Vacuum cooling: all 310 models compared

Use the filters on the left to narrow the selection – by manufacturer, technology and the models’ key figures, for 50 or 60 Hz.

Atlas Copco DRB series 4 models

DRB 250Pumping speed 253 m³/h 50 Hz304 m³/h 60 HzUltimate pressure Rated motor power 1.1 kW 50 Hz1.1 kW 60 HzVariants 2
DRB 500Pumping speed 505 m³/h 50 Hz606 m³/h 60 HzUltimate pressure Rated motor power 2.2 kW 50 Hz2.2 kW 60 HzVariants 2
DRB 1000Pumping speed 1,000 m³/h 50 Hz1,200 m³/h 60 HzUltimate pressure Rated motor power 4 kW 50 Hz4 kW 60 HzVariants 2
DRB 2000Pumping speed 2,050 m³/h 50 Hz2,460 m³/h 60 HzUltimate pressure Rated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 2

Atlas Copco DWS VSD+ series 6 models

DWS 160 VSD+Pumping speed 160 m³/h 50 Hz160 m³/h 60 HzUltimate pressure 0.01 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 1
DWS 250 VSD+Pumping speed 250 m³/h 50 Hz250 m³/h 60 HzUltimate pressure 0.01 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 1
DWS 450 VSD+Pumping speed 450 m³/h 50 Hz450 m³/h 60 HzUltimate pressure 0.01 mbarRated motor power 11 kW 50 Hz11 kW 60 HzVariants 3
DWS 750 VSD+Pumping speed 740 m³/h 50 Hz740 m³/h 60 HzUltimate pressure 0.01 mbarRated motor power 22 kW 50 Hz22 kW 60 HzVariants 3
DWS 160/1750 VSD+Pumping speed 1,200 m³/h 50 Hz1,200 m³/h 60 HzUltimate pressure 1 × 10-3 mbarRated motor power 12 kW 50 Hz12 kW 60 HzVariants 1
DWS 250/2600 VSD+Pumping speed 1,900 m³/h 50 Hz1,900 m³/h 60 HzUltimate pressure 1 × 10-3 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants 1

Atlas Copco GHS VSD+ series 21 models

GHS 350 VSD+Pumping speed 400 m³/h 50 Hz400 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 5.5 kW 50 Hz5.5 kW 60 HzVariants 29
GHS 402 VSD+Pumping speed 467 m³/h 50 Hz467 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 5.5 – 7.5 kW 50 Hz5.5 – 7.5 kW 60 HzVariants 4
GHS 585 VSD+Pumping speed 560 m³/h 50 Hz560 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 30
GHS 602 VSD+Pumping speed 640 m³/h 50 Hz640 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 7.5 – 11 kW 50 Hz7.5 – 11 kW 60 HzVariants 4
GHS 730 VSD+Pumping speed 730 m³/h 50 Hz730 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 11 kW 50 Hz11 kW 60 HzVariants 30
GHS 752 VSD+Pumping speed 805 m³/h 50 Hz805 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 11 – 15 kW 50 Hz11 – 15 kW 60 HzVariants 4
GHS 900 VSD+Pumping speed 870 m³/h 50 Hz870 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants 32
GHS 902 VSD+Pumping speed 917 m³/h 50 Hz917 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 15 – 18.5 kW 50 Hz15 – 18.5 kW 60 HzVariants 4
GHS 1002 VSD+Pumping speed 1,039 m³/h 50 Hz1,039 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 18.5 kW 50 Hz18.5 kW 60 HzVariants
GHS 1202 VSD+Pumping speed 1,172 m³/h 50 Hz1,172 m³/h 60 HzUltimate pressure 0.3 mbarRated motor power 18.5 kW 50 Hz18.5 kW 60 HzVariants 9
GHS 1300 VSD+Pumping speed 1,250 – 1,615 m³/h 50 Hz1,250 – 1,615 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 18 – 22 kW 50 Hz18 – 22 kW 60 HzVariants 33
GHS 1402 VSD+Pumping speed 1,383 m³/h 50 Hz1,383 m³/h 60 HzUltimate pressure 0.3 mbarRated motor power 22 kW 50 Hz22 kW 60 HzVariants 9
GHS 1602 VSD+Pumping speed 1,581 m³/h 50 Hz1,581 m³/h 60 HzUltimate pressure 0.3 mbarRated motor power 30 kW 50 Hz30 kW 60 HzVariants 9
GHS 1600 VSD+Pumping speed 1,590 – 1,811 m³/h 50 Hz1,590 – 1,811 m³/h 60 HzUltimate pressure 0.35 mbarRated motor power 28 – 30 kW 50 Hz28 – 30 kW 60 HzVariants 33

Becker RBP series 3 models

Becker U4 series 6 models

Becker U series 8 models

Becker VADS series 3 models

Busch COBRA Industry series 36 models

Busch DOLPHIN series 70 models

Busch PANDA/PUMA series 26 models

Busch R5 series 58 models

Edwards LR1A series 12 models

Edwards LR1C series 9 models

Edwards LR1D series 12 models

Leybold DRYVAC series 9 models

Leybold NOVADRY series 4 models

Leybold SOGEVAC series 23 models

Model comparison

Models a manufacturer no longer carries in its current range are listed in its “Outdated models” section.

Industries

Vacuum cooling: where the manufacturers name it

The manufacturers list these uses on their own pages.

Food and beverage

Busch lists vacuum cooling in its product finder with R5, COBRA, DOLPHIN and PANDA/PUMA; Edwards names rapid cooling in food processing with its liquid ring series LR1A, LR1C and LR1D.

Industry page: Food and beverage →

Packaging

Becker names the vacuum cooling of bakery products (20–40% shorter cooling time, U/U4 with RBP) under primary packaging and food processing, Leybold the rapid cooling of leafy vegetables, sushi rice and bread with SOGEVAC, NOVADRY and DRYVAC under food processing and packaging.

Industry page: Packaging →

Chemicals

Elmo Rietschle lists cooling among its applications for the chemical industry without describing it or naming a series.

Industry page: Chemicals →

Frequently asked questions

Vacuum cooling: frequently asked questions

How does vacuum cooling work?

The warm product goes into a sealed chamber, and the vacuum pump lowers the pressure. Under vacuum, the water in the product evaporates at a low temperature, and evaporating water removes heat – this is how Becker describes the principle for bakery products. At the end, the chamber is vented and the cooled product is removed.

How much faster is vacuum cooling?

For the vacuum cooling of bakery products, Becker names cooling times that are 20–40% shorter. Leybold speaks of rapid cooling.

Which vacuum pump for the vacuum cooling of bakery products?

Becker names its U and U4 series with the Roots pump RBP for this, and VADS where needed in the line periphery. Leybold lists baking and cooling with vacuum for DRYVAC DV FP-r and names bread among the products that are vacuum-cooled with SOGEVAC, NOVADRY and DRYVAC.

Which vacuum pump for vegetables, lettuce and fruit?

Leybold names vacuum cooling above all for leafy vegetables, and SOGEVAC, NOVADRY and DRYVAC for it. Atlas Copco names the vacuum cooling of vegetables, fruit and flowers for its Roots pump DRB and the screw vacuum pumps GHS VSD+ 1202–2002.

How much vacuum does vacuum cooling need?

In physical terms: the lower the pressure, the lower the temperature at which the water in the product evaporates. Which pressure a system runs at depends on the product and the target temperature.

Oil-free or oil-lubricated for vacuum cooling?

Both are named. Oil-lubricated rotary vane vacuum pumps: Becker U and U4, Leybold SOGEVAC, Busch R5; oil-lubricated screw vacuum pumps: Atlas Copco GHS VSD+. Dry-running: Leybold NOVADRY and DRYVAC, Atlas Copco DWS VSD+, Busch COBRA (screw) and PANDA/PUMA (Roots). With water as the operating liquid: Busch DOLPHIN and Edwards LR1A, LR1C, LR1D (liquid ring).

Why is bread cooled under vacuum?

Because evaporating water removes heat from the baked goods, as Becker describes it; Becker names cooling times that are 20–40% shorter. Leybold names bread alongside leafy vegetables and sushi rice among the products that are vacuum-cooled.

What happens to the water vapour from the product?

The vapour enters the line to the vacuum pump together with the extracted air. A separator retains condensate, and the pump discharges air and vapour through the exhaust. For the application, Becker and Atlas Copco name pump systems made up of a backing pump and a Roots pump (U/U4 with RBP, GHS 1202–2002 with DRB), which remove large gas volumes at low pressure.

Which manufacturers name vacuum cooling?

It is named by Atlas Copco (DRB, GHS VSD+, DWS VSD+), Becker (U, U4, RBP, VADS), Busch (R5, COBRA, DOLPHIN, PANDA/PUMA), Edwards (LR1A, LR1C, LR1D), Elmo Rietschle (without a series) and Leybold (SOGEVAC, NOVADRY, DRYVAC).

Is vacuum cooling also used in the chemical industry?

Elmo Rietschle lists cooling among its applications for the chemical industry, but does not describe it and names no series. Atlas Copco also names cooling and cooling systems for DWS VSD+ and GHS VSD+ 402–1002 without a description.

A single pump or a central vacuum system?

A central system in a room of its own keeps noise and heat away from production and matches its output to the demand. Central vacuum systems are planned and built by Eugen Theis Vakuum, a company of the Ehrler & Beck group – more under Central Vacuum.

Does Ehrler & Beck also supply spare parts and service?

Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.

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