Manufacturer and designer of finned heat exchangers made of copper/aluminium and stainless steel for refrigeration, air conditioning and environmental technology
LKI Industrievertretungen GmbH
Wilnsdorf (Thomasstr. 9)New on Amplifa
About LKI Industrievertretungen
LKI Industrievertretungen GmbH, based in Wilnsdorf near Siegen, has been a partner for refrigeration, air conditioning and environmental technology for more than 25 years and supplies finned heat exchangers for almost every application. The product range includes CU/ALU finned heat exchangers (CU/AL, CU/AL-Epoxy, CU/AlMg, CU/CU) as well as VA/VA heat exchangers in stainless steel/stainless steel as air coolers, air heaters, heat recovery and circulation-coupled systems, direct evaporators and condensers for water, water/glycol and refrigerants such as R410a, R134a and ammonia. The offering is complemented by polypropylene mist eliminators, series heat exchangers ex stock as well as single-unit, sample and prototype heat exchangers as custom builds with or without casing. Design and performance calculation are carried out using UNILAB software; manufacturing is performed by brazing (silphos/silver solder) under shielding gas, mechanical tube expansion and frame fabrication from galvanised steel, aluminium or stainless steel. Customers include VW Wolfsburg, Fresenius, BASF Ludwigshafen, the Hannen Brewery and the University of Göttingen.
- Site
- Wilnsdorf
- Processes
- Finned heat exchanger manufacturing (CU/ALU), VA/VA finned heat exchangers (stainless steel/stainless steel), Mist eliminator manufacturing, Custom-built heat exchangers (single-unit, sample and prototype builds, with or without casing), Series heat exchangers (ex stock), Pneumatic pressure and tightness testing (under water, 20-30 bar, DIN 8964), Brazing (silphos/silver solder) under shielding gas, Heat exchanger design and performance calculation (UNILAB software)
- Materials
- Copper, Aluminium, Aluminium with epoxy resin coating, AlMg (aluminium-magnesium alloy), V2A (stainless steel), Galvanised steel / steel, Brass, Red bronze
- Certificates
- EN ISO 9001, Eurovent Certification (air coolers & air heaters, geometries 2522, 3228, 4035), Eurovent Certification (geometries 2522, 3228, 4035), DGRL 97/23/EC Art. 3 AG.3, Tightness class A according to EN 1507(3) (duct installation, on request), TÜV acceptance (custom build, on request)
- Industries
- Refrigeration and air conditioning technology, Ventilation technology, Building air conditioning, IT and electronics, Energy and solar systems, Room air and induction technology
- 01
Design and performance calculation (UNILAB)
- 02
Fin pack fabrication and mechanical tube expansion
- 03
Brazing of return bends and headers under shielding gas
- 04
Frame fabrication (riveting/screwing/welding) and surface treatment
- 05
Tightness and pressure test according to DIN 8964
- 06
Quality control at the LKI external warehouse near Siegen
- 07
Marking, packaging in wooden crates and shipping
Materials and processes
Copper/Aluminium
Standard combination for finned heat exchangers as air coolers, air heaters and KVS systems.
Aluminium with epoxy resin coating
Corrosion-protected fins, e.g. for ammonia coolers in brewery technology.
AlMg (aluminium-magnesium alloy)
Fin material for increased corrosion requirements.
Stainless steel (VA/VA)
For direct evaporators and heat exchangers with integrated PP mist eliminator, e.g. at BASF Ludwigshafen.
Galvanised steel
Frames and casings made of galvanised sheet steel protect the fin pack and tube bends.
Brass and red bronze
Nipples and sockets for headers, distributors and connection nozzles.
Polypropylene (PP)
Mist eliminators downstream of air coolers for condensate separation and corrosion protection of downstream units.
Brazing under shielding gas
Joining process for return bends and headers with a firm, heat-conducting connection.
Locations
Wilnsdorf
DEHead office and external warehouse with quality control
- Part weight / size
- Fin length up to 6500 mm, fin height up to 2000 mm
- Lot size
- Single units to series production (ex stock)
- Materials
- Copper, aluminium, stainless steel, galvanised steel, PP
- Pressure test rig (pneumatic testing under water, 20–30 bar)
- UNILAB design software
- Warehouse with visual, dimensional and tightness inspection
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Finned heat exchanger manufacturing (CU/ALU)Joining | – | 6500 mm (fin pack length) × 2000 mm (fin height) | – | – | Copper, Aluminium, Aluminium with epoxy resin coating, AlMg, V2A (stainless steel), Galvanised steel, Brass, Red bronze |
| VA/VA finned heat exchangers (stainless steel/stainless steel)Joining | – | – | – | – | V2A (stainless steel) |
| Mist eliminator manufacturingPlastics | – | – | – | – | PP (polypropylene) |
| Custom-built heat exchangers (single-unit, sample and prototype builds, with or without casing)Joining | – | – | – | 1 | Copper, Aluminium, V2A (stainless steel) |
| Series heat exchangers (ex stock)Joining | – | – | – | – | Copper, Aluminium |
| Pneumatic pressure and tightness testing (under water, 20-30 bar, DIN 8964)Testing | – | – | – | – | Copper, V2A (stainless steel) |
| Brazing (silphos/silver solder) under shielding gasJoining | – | – | – | – | Copper |
| Heat exchanger design and performance calculation (UNILAB software)Engineering | – | – | – | – | – |
| Powder coating of heat exchangersSurface | – | – | – | – | Copper, Aluminium |
| Epoxy resin coating of finsSurface | – | – | – | – | Aluminium |
| Galvanising of frames/sheet steelSurface | – | – | – | – | Steel |
| Frame fabrication: riveting/screwing/weldingJoining | – | – | – | – | Galvanised steel, Aluminium, Steel, Stainless steel |
Additional services
Reference customers
Quality
Manufacturing is certified according to EN ISO 9001 (TÜV), and selected geometries (2522, 3228, 4035) are Eurovent-certified. Every heat exchanger is routinely subjected to a pneumatic tightness and pressure test under water according to DIN 8964 (20–30 bar) as well as a visual, dimensional and tightness inspection at the LKI external warehouse; TÜV acceptance for custom builds is available on request.
| Evidence | Wilnsdorf |
|---|---|
| EN ISO 9001 | |
| Eurovent Certification (geometries 2522, 3228, 4035) | |
| DGRL 97/23/EC Art. 3 AG.3 | |
| Tightness class A according to EN 1507(3) (duct installation, on request) | |
| TÜV acceptance (custom build, on request) |
History
Start of operations as a partner for refrigeration, air conditioning and environmental technology – more than 25 years on the market
Eurovent certification for air coolers and air heaters in the geometries 2522 and 3228