Falling-Film Chiller

Falling-Film Chiller Process reliability to produce constant ice water near freezing point

In the Falling-Film Chiller or baudelot ice water cooler the homogeneous falling film allows to chill water down to 0,5 °C with no risk of freezing in continuous process operation. There is no mechanical destruction of the Falling-Film Chiller, if control fluctuations of the cooling system lead to ice formation. The unit will not even be damaged, if the regulation fails and causes the building of ice. Once ice is formed on the system due to unexpected control fluctuations, it will fall off within the next normal operation mode. Our devices generate a maximum power reserve in production with this Falling-Film Chiller or baudelot ice water cooler at this temperature.

Low-specific and thermodynamic parameters of water to act as Ice Water are favourable

Ice water has a very good heat capacity, i.e. by contrast with other cooling agents relatively small quantities can convey a large amount of heat. In other words, achieve high cooling performance. The flow-specific and thermodynamic parameters of water are favourable, so that high heat transfer rates can be achieved. However, the freezing point of the water itself (zero point) sets crucial physical boundaries for ice water production and cooling with ice water. On the one hand, as regards the temperatures achievable in the water efforts are made to approach the zero point as closely as possible in order to exploit maximum temperature differences for the products to be chilled with ice water and to keep the temperature of the cooled product as low as possible.

On the other hand, as zero point is approached, the problems in ice water production with the attendant risk of ice formation increase. The known anomaly of water (lowest specific volume at 4°C) results in the water volume expanding when it freezes, and under certain circumstances this can cause destruction of the equipment used. Furthermore, ice formation in ice water systems with their thick layers of ice always involves considerable performance losses because the ice layer acts like insulation and greatly reduces the thermal transmission output.

Consequently ice water production calls for a technique that on the one hand brings the water temperature as close as possible to zero point, but on the other hand is not susceptible to potential ice formation.

Falling-Film Chiller in food any dairy processes

Above all, a Falling-Film Chiller or baudelot ice water cooler continuously generates ice water at 0.5 ° C without ice. Furthermore water near freezing is an important part of food and dairy refrigeration, to ensure the fastest possible cooling of the product to be cooled with the best possible product quality. Most noteworthy Ice water at 0.5°C can cool large produce in very short period of time. Under hygiene and thermodynamic aspects, cooling with ice water in the dairy and food processing industries can be considered as the safest and most effective method of cooling a wide range of products to the necessary low temperatures. Similarly blanching, cooling and washing processes are mainly focussed as well as mixing processes with any requirement of low temperatures while or right after mixing processes. Completely made out of stainless steel, it assures all required sanitary requirements. There are various detailed sanitary adjustments for  the standard Falling-Film Chiller due to different process requirements in use.

Falling-Film Chiller Method of operation

Water is pumped into the distribution tray and at a controlled rate is distributed homogeneously by a
distribution through onto vertical panels in an open system. The process water flows in a thn film over the outer surface down on the panels and obtains the highets possible outside film coefficient. By highets descent speed, highest K transmission coefficients are reached. The high flow velocity ensures highly efficient heat transfer and a kind of a helpful self cleaning effect, which allows the operation with polluted liquids as well.

The open, non-pressurized water side of this Falling-Film Chiller or baudelot ice water cooler allows inspections and cleaning of dirt without disassembly in a few minutes. Experienced engineers with academic advice are responsible for the design. Individual channel design  and construction for each project due to the high inside film coefficient and low pressure drop.

In the Falling-Film Chiller or baudelot ice water cooler the homogeneous falling film allows to chill water down to 0,5 °C without danger of freezing. Within industrial processes it can function as pre-chiller for industrial ice bank systems or is conected to the ice water side of a Plate Heat Exchanger. Or will be pumped directly to various food cooling processes. From the water collecting tank under the Falling-Film Chiller pumps to bring the chilled water to the desired consumption location.

Falling-Film Chiller and discontinuous inlet water flow

If water with discontinuous or changing flow rate temperatures is to be cooled, there is a split-tank-design, which allows continuous operation of the evaporator, what is aspired for any refrigeration machine. The water reservoir with flow path is individually dimensioned according to the flow profile and the water temperatures. This Falling-Film Chiller or baudelot ice water cooler is designed to be robust to unexpected fluctuations in operation. Due to the exclusive processing of stainless steel, we meet all the requirements for a food-grade design of an Ice Water Falling-Film Chiller.

Falling-Film Chiller advantages

  • No risk of freezing with ice water of 0.5 ° C
  • Suitable for contaminated liquids (for example greywater or red water)
  • Easy access to the open system
  • Easy to clean
  • No seals
  • Enclosed design prevents product contamination
  • Completely made of stainless steel, also for salt water
  • Special falling film chiller versions possible

Falling-Film Chiller technical specifications

  • Capacities from 10 kW to 10,000 kW
  • Evaporator for all primary refrigerants (NH3, freonss, CO2) and operating modes, secondary refrigerants (Any type of Glycol) or for brine operation
  • All stainless steel materials, from AISI304 up to titanium, 254-SMO, Duplex etc.
    This stainless steel execution gives assurance that the chilled water is always and only in contact with stainless steeel parts and can be used directly for the use required
  • Plug-in units up to 100 kW, or for on-site refrigeration systems

Falling-Film Chiller applications and benefits

  • Evaporator for water cooling up to 0.5 ° C.
  • Fastest cooling of food close to freezing by high efficiency
  • No risk of freezing damage to food used in fresh produce, bakeries, meat, fish, seafood etc.
  • Falling-Film Chiller are preferred in application of high capacities with limited ground space
  • Falling-Film Chiller plates chill liquids to almost refrigerant temperature
  • Ideal for cooling down milk, yoghurt and cheese cooling as well as for beer, meat, fish, vegetables and food and beverages in general

Falling-Film Chiller simple maintenance

  • Comfortable access to the open system
  • Easy to clean:
    • open water distribution tray
    • large discharge opening for the discharge of particles
    • removable side panels
    • open construction plate system

Falling-Film Chiller construction and dimensions example

Compact system 1.2 0.5 1.8
System type A 2.0 2.1 2.0
System type B 3.8 2.5 2.0

Talk with our engineers!

We have always assimilated engineering science and thermodynamics optimally in the various manufacturing processes.

Thermodynamicists,mechanical engineers and welding engineers define the dimensioning, design and construction of customised heat exchanger panels and systems in materials ranging from mild and austenitic steels through to titanium, and ensure successful distribution of their work worldwide.

In doing so they fall back on production engineering expertise and calculations developed in the course of the past hundred years that are still being continuously optimised in an ongoing process.

In the perception of our customers, the Buco product stands for:

  • Technical and process-oriented consulting
  • Thermodynamic efficiency
  • Quality and longevity

Talk with our engineers!

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