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Heat exchangers

Series and customer-specific heat exchangers for every application

LE / LK

HFC | CO2 |  Water | Brine

  • High-quality heat exchangers made in Germany
  • High-performance heat exchangers with maximum power per m²
  • Thermodynamic design with our own design software
  • 100% custom-made with a guaranteed quick delivery time 
  • Individual heat exchanger construction even for a batch size of 1

 

ANFRAGEN                  KALKULIEREN

Customised heat exchangers for your system specific requirements

 

Together with you, we develop customised heat exchangers for your cooling requirements. Either as standard or as a system solution for specific applications.
Regardless of whether it is a question of requirements for refrigerants, energy efficiency, corrosion protection, material combinations, different fin spacings or optimised tube and fin geometries, Roller offers the optimum solution for every performance range and every application in refrigeration technology with its wide range of heat exchangers.
Even under extreme climatic conditions, our heat exchangers prove their performance and reliability every day.

 

Types of heat exchanger

These design types are available to you

Evaporators

can be used in a wide range of cooling and air conditioning scenarios with almost all refrigerants

Condensers

are used wherever heat is to be dissipated into the ambient air using coolants

Air heaters

in various forms are used for heating or ventilation and use either warm water or brine (PWW) 

Air coolers

are frequently used in air conditioning and air dehumidification and use pumped cold water or brine as the circuit medium

Closed-loop recycling system:

Matching supply and exhaust air heat exchangers which can recover up to 80% of the heat

Multi-circuit heat exchangers

are designed so that the circuits are arranged in intermeshing or parallel form in a heat exchanger coil. They are very popular where space is limited or as a redundancy solution

Specially designed heat exchangers

or customer-specific applications (e.g. three-sided, four-sided, round/cylindrical)

Features

All product advantages at a glance

General

  • Capacity range: from the smallest power outputs for electronic switch cabinets under 100 W to industrial heat exchangers over 1 MW
  • Temperature range: -198°C – +150 °C 
  • Heat exchanger coil for an operating pressure of 16 bar / 80 bar with high-pressure refrigerants (CO2/ R744)
  • Core tubes in copper CuDHP with thick walls in Ø 9.5, 10, 12 and 15 mm thicknesses
  • Possible fin spacings: 2.0 / 2.5 / 3 / 4 / 4.5 / 6 / 7 / 8 / 10 / 12 mm (others on request)
  • Core tube with smooth or grooved inner surfaces

 

Connections

  • Distribution outlet header made of copper
  • Coolant distributor made of brass
  • Brazed hexagon nipples, threaded nipples or flange depending on the operating mode (others on request)
  • Ventilation connections
  • Drain connections
  • Special connections on request

Quality and pressure checks

  • Use of high-quality copper tubing primarily from German manufacturers
  • Return bends made from high-quality copper tubing from German manufacturers with a wall thickness of 0.6 – 1.5 mm 
  • Production in accordance with the Pressure Equipment Directive 2014/68/EUG and EN 378
  • Pressure checks on units with water/brine: 18 bar overpressure
  • Pressure checks on units with coolant: 27.5 bar overpressure
  • Pressure checks on units with high-pressure refrigerants: < 27.5 – 115 bar overpressure
  • All units are subject to an exacting outgoing quality check
  • Special checks when flammable coolants are used

 

Inspection and cleaning

  • Smooth fin surfaces prevent soiling and make cleaning easier
  • Thick fans for extra stability during cleaning
  • Robust construction for torsion-free installation 
  • Protective filling (dried air) for heat exchangers using coolants

 

Types of corrosion protection

The heat exchangers can be equipped in a variety of corrosion protection types

Corrosion-resistant aluminium (AlFe1,5Mn)

fins are standard at Roller and can be used for long periods in slightly aggressive ambient air

AlMg3 fins

are highly suitable for use in slightly alkaline atmospheres in industrial applications

Copper fins

offer greater protection against specific environmental conditions, e.g. close to the sea or in construction materials processing

Hydrophilic fins

This coating offers good protection in damp atmospheres (e.g. sprayed heat exchangers) and helps with condensation drainage

Gold lacquer fins (epoxy)

have a vinyl-based epoxy resin coating. They offer increased protection against slightly aggressive substances such as cleaning products, vinegar etc. and make cleaning easier

2-component lacquer

 with an even coating over the entire fin offers excellent protection against aggressive atmospheres

Tin-coated copper tubing

has an additional layer of tin and offers extra protection against corrosion of the copper core tube

Further corrosion protection options

  • Powder coating with an even coating over the entire fin offers excellent protection against aggressive atmospheres  
  • Frame, cover, end and base plates made from aluminium, stainless steel and copper 
  • Frame parts can be coated with 2-component lacquer 

Available accessories

Available accessories

  • Drain / ventilation connection
  • Threaded flat seals
  • Welding neck flange
  • Loose flange in stainless steel
  • Victaulic quick couplings
  • Electric coil defrost heating
  • Stainless steel frame for unit installation
  • Numerous sub-circuits possible
  • Specially designed frame
  • Other special designs on request

References

Drying - LE/LK - Mälzerei/Malthouse

The drying of food requires a great deal of know-how. The same applies to the heat exchanger systems when it comes to the choice of materials, the construction and tube geometry to ensure the optimum transfer of heat. For the expansion and modernization of two new kilns at a large malthouse in Bremen/Germany, Roller supplied 12 heat exchangers (6 per kiln), each with a power output of approx. 1700 kW.  Total output: 20 MW.

ApplicationMalthouse
AddressBremen / Germany
FluidWater
ProductLE - Heat exchanger

Blast freezing - LK - Advansor

At this meat processing company, the pre-cooled meat is blast frozen by reducing its temperature to below -18 °C in a very short time. High cooling power and a large air quantity with high external pressure play a key role during blast freezing. For this system operated with CO2, the engineers opted for LE/LK heat exchangers from Roller given the company's wealth of experience in designing and building such products.

ApplicationBlast freezing
AddressGRAO / Spain
FluidCO2
ProductLK - Heat exchanger

Water samples - LK - PMC Markgröningen

The company PMC from Markgröningen/Germany builds special cooling units which run in independent water sample cabinets with 24 V batteries and without an external power supply. Because the water samples which are to be cooled can be corrosive, the special heat exchangers from Roller were produced with tin-coated copper tubes and Roller gold lacquer fins.

ApplicationEnvironmental simulation
AddressMarkgröningen /Germany
Fluid
ProductLK 280/3/3/2,5

Product documentation

Technical data

All important technical data

Tube system identification   2/6 3/7 4/8 5/9 10/11
Tube system   Offset Aligned Offset Aligned Aligned
    25 x 21,65 mm 35 x 35 mm 40 x 35 mm 50 x 50 mm 35 x 35 mm
Tube profile   Smooth or internally grooved Smooth or internally grooved Smooth or internally grooved Smooth or internally grooved Smooth or internally grooved
Tube rows   2 - 12 1 - 20 1 - 20 (up to 12 from one piece) 1 - 20 1 - 20
Tube diameter   10 mm 12 mm 15 mm 15 mm 9,5 mm
Tube wall thickness   0,4 mm 0,4 or 0,6 mm 0,4 or 1,0 mm 0,4 or 1,0 mm 0,35 or 0,7 mm
Fin thickness Aluminium 0,2 - 0,25 mm 0,2 - 0,3 mm 0,2 - 0,3 mm 0,2 - 0,3 mm 0,2 - 0,3 mm
  Alu with gold lacquer 0,2 mm 0,2 mm 0,2 mm 0,2 mm 0,2 mm
  Alu with hydrophilic coating 0,2 mm 0,2 mm 0,2 mm 0,2 mm 0,2 mm
  AlMg3 - 0,2 mm 0,2 mm 0,2 mm -
  Copper 0,2 mm 0,2 mm 0,15 - 0,2 mm 0,2 mm 0,2 mm
Fin spacing   2/2,5/3/4/4,5 mm 2/2,5/3/4/4,5/6/7 mm 2/2,5/3/4/4,5/5/7 mm 4/4,5/6/7/8/10 mm *** 2/2,5/3/4/4,5/6/7/10 mm***
Finned length   80 - 3.200 mm 200 - 4.100 mm* 200 - 4.100 mm* 200 - 4.100 mm* 80 - 3.200 mm
Finned height   75 - 1.900 mm 105 - 2.400 mm** 120 - 2.400 mm** 100 - 2.400 mm** 105 - 2.400 mm**
Finned depth   44 - 260 mm 35 - 700 mm 37 - 700 mm 50 - 1000 mm 35 - 700 mm
Temperature range   -198 °C to 150°C -198 °C to 150°C -198 °C to 150°C -198 °C to 150°C -198 °C to 150°C
    * up to 8.000 mm ** up to 2.700 mm *** 12 mm on request    

How can we help you?

We consult you competently and comprehensively!

Make a concrete enquiry now!


ralph.heller@walterroller.de
Tel.: +49 (0) 7156 / 2001-50

 

sven.koethe@walterroller.de
Tel.: +49 (0) 7156 / 2001-32