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
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.
The LE/LK is used in these areas of application
Today, a multitude of different applications such as server rooms, clean rooms, medical facilities and practices, shops, offices, greenhouses, and so on, place specific demands on building technology.
The right temperature, air quality and air movement play an important role. Here, with individual heat exchangers, we offer suitable solutions for a wide range of tasks.
The robust HKN air-conditioning unit stands for barely noticeable conditioning and a comfortable indoor climate with high energy efficiency.
The manufacturing industry depends on the reliable maintenance of specific temperatures to ensure high quality of the goods produced. Precise temperature control, reliability and energy efficiency are a priority.
Roller offers a wide range of heat exchangers and air coolers for process cooling.
Talk to us.
During the generation of energy, waste heat is generated that has to be dissipated or reused. Efficient and robust heat exchanger systems are indispensable for fail-safe energy management. Heat exchangers can be manufactured by Roller in any individual design.
We will be happy to advise you on the design of your specific heat exchanger.
Especially high demands are placed on refrigeration in the food industry.
Hygiene, energy efficiency and reliability are the top priorities.
But even when it comes to requirements for refrigerants, corrosion protection, material combinations, practical fin spacing, optimised tube and fin geometries, uniform air distribution or energy efficiency, Roller offers the optimised solution for every performance range and every application with its wide product range of evaporators and air coolers.
Storage & Logistics
The requirements for cooling in warehouse logistics could not be more diverse. The tasks are very specific:
In plus cold stores for fruit and vegetables, it is crucial that the sensitive chilled goods are stored in the right conditions and cooled gently. Dairy products are highly perishable and require a closed cold chain. Ripening chambers turn fruit varieties into products ready for sale.
In deep-freeze warehouses, uniform temperature distribution is important, reliable air coolers protect against thawing of the goods. In order-picking rooms, the impact on employees must be minimised. Roller offers a variety of individual solutions for all applications.
The range of refrigeration technology for the retail trade is broad. Whether it's a butcher's shop, bakery, flower shop, petrol station, restaurant or supermarket - each sector has its own requirements to ensure optimum product quality.
One thing is always in the foreground: reliability in refrigeration technology when it comes to failure safety, hygiene or energy efficiency. Roller is the specialist for air coolers, evaporators and heat exchangers for the commercial sector.
- HVAC industry
- Process cooling
- Energy technology
- Food Industry
- Storage & Logistics
- Commercial refrigeration
Types of heat exchanger
These design types are available to you
can be used in a wide range of cooling and air conditioning scenarios with almost all refrigerants
are used wherever heat is to be dissipated into the ambient air using coolants
in various forms are used for heating or ventilation and use either warm water or brine (PWW)
are frequently used in air conditioning and air dehumidification and use pumped cold water or brine as the circuit medium
Heat recovery closed-loop recycling system:
Highly efficient, combined supply and extract air heat exchangers for efficiencies of up to 80% with very low pressure losses on the air side - TÜV type-examination
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)
All product advantages at a glance
- 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
- 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/EU
- 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
offer greater protection against specific environmental conditions, e.g. close to the sea or in construction materials processing
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
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
- 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
Type examination for heat recovery closed-loop recycling system:
Roller heat exchangers have met the requirements of TÜV SÜD for heat recovery systems since 2009. The type examination is a certification procedure that determines and certifies that a representative sample has been constructed in accordance with the standards.
As examples of our wide range of heat exchanger variants, the heat exchanger systems 35x35x12 (aligned pipe arrangement) and 40x35x15 (offset pipe arrangement), each with 12 and 24 rows of pipes, have been measured and certified in accordance with EN 308.
EN 308 specifies the test procedure for heat exchangers to determine the performance criteria of air/air heat recovery systems that recover heat from heating systems in buildings.
The heat recovery closed-loop recycling system was built in an air handling unit during the test.
The tests included the reception inspection, the measuring of the recovery efficiency of the Heat recovery closed-loop recycling system as well as the pressure loss on air and medium side.
We will be pleased to provide you with the test reports on request.
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.
|Address||Bremen / Germany|
|Product||LE - Heat exchanger|
Confectionery cooling - LK - Fritsch
In the production of chocolate Easter bunnies and Santa Clauses, it is important to precisely maintain specified process temperatures. For a chocolate producer from Rhineland-Palatinate, an existing heat exchanger for a cooling tunnel was replicated 1:1 and replaced. The required cooling capacity of 77kW with limited space situation of 1.7 sqm inflow surface led to this cubic direct evaporator with 20 (!!!) pipe rows in depth. With a 50x50 aligned pipe system, the pressure loss is kept as low as possible at a volume flow of 13,000m²/h.
Fail-safety is ensured by the split in two interlocked R407C refrigeration circuits, which operate redundantly to each other. Together with installer company Fritsch, the measurements for this replacement were taken at the end customer's location in order to meet the details of this exceptional requirement right from the start.
|Address||Rhineland-Palatinate / Germany|
Wood drying - LE
In order to bring the wood to the correct moisture condition for further use, huge heat volumes and special heat exchangers are required.
Since there is a lot of dirt in the air flow of the drying system, the choice fell on a particularly dirt-resistant and easy-to-clean roller pipe system with aligned pipe design. The fin spacing of 7 mm is very large for a heating coil, so that a certain particle size can easily pass through the heat exchanger. When the cleaning interval is reached, the fins are so robust with a thickness of 0.3mm that they can easily withstand cleaning with a high-pressure cleaner without deforming.
The heat exchanger frame is perforated all around for adaptation by the customer, whereby the slotted holes compensate for any tolerances, so that time-consuming re-drilling is no longer necessary.
Cryogenic test chamber - LE/LK - F. Zaugg
In order to guarantee the quality and resistance of materials, tests under extreme conditions are necessary. To maintain a room temperature of -60°C in this cryogenic test chamber, the system builder, F. Zaugg AG Kälte und Klima, used a special two-stage Roller direct evaporator coil for cascade operation. The test chamber is first cooled to -20°C with R449a via the first circuit. When this temperature has been reached, the second circuit with the cryogenic refrigerant R23 is switched on and the first circuit now cools the cascade condenser for the cryogenic circuit. In order to reliably generate the evaporation temperature of -66°C in the second circuit, the requirements regarding the nature of the evaporator coil as well as the thermodynamic requirements are very specific. In close cooperation with the customer, an optimally suitable solution was also found for this project.
|Address||Swiss / Thun|
|Fluid||R449a / R23|
|Product||LE / LK|
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.
|Address||GRAO / Spain|
|Product||LK - Heat exchanger|
Snow Paradise - LK - Klafs
One of the most fascinating cooling experiences can be enjoyed by discerning sauna guests all over the world in so called snow paradies: These winter landscapes are formed with rocks and crevasses and offer a room temperature of -10°C for cooling off after a sauna session.
A step into the winter landscape does not only help to cool off the body, but also to quickly regain the normal oxygen level of the lungs. Roller heat exchangers are also used here to produce the finest powder snow, which can be used to rub off the skin and thus contribute to quite an intense experience.
|Address||Schwäbisch Hall / Germany|
Apple storage - LK - Chile
Fans and consumers of Chilean apples can breathe a sigh of relief. Industrial evaporators were produced for a major customer from South America, which contribute to the preservation of the apple harvest, so that consumers worldwide can also enjoy the fruit outside of there own apple season. These direct evaporator coils provide a very high capacity during the cool-down phase of fruit storage, and later operate at reduced capacity in partial-load mode during long-term cooling in order to dissipate the transmission heat through the walls, as well as the respiration heat of the refrigerated goods. The customer's know-how consists on the one hand in designing an efficient solution for these fluctuating loads and on the other hand in creating an atmosphere so that the fruit does not become wrinkled and soft through dehumidification, but remains crisp and fresh.
|Application||Fruit-vegetable cooling - LK - Chile|
All important technical data
|Tube system identification||2/6||3/7||4/8||5/9||10/11|
|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|
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Tel.: +49 (0) 7156 / 2001-50