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WEKA offers boxcoolers for diesel engines 3 to 30,000 kW; in standard models or specifically designed for an application.
 
We have a wider variety of boxcoolers than any other manufacturer.
 
WEKA recommends boxcoolers made of copper-nickel with CuNi protection for almost all applications. However, for special applications, WEKA can offer boxcoolers made by different materials:
  • steel galvanised U-formed
  • steel galvanised coated horizontal
  • steel galvanised coated U-formed
  • aluminium-brass
  • aluminium-brass coated
  • copper-nickel with protection unit WEKA Protector
    Copper-nickel boxcoolers have several advantages - but they need protection against galvanic corrosion. WEKA as the only boxcooler manufacturer has solved the protection problem in an economically and environmentally fully acceptable manner.
     
    Introduction
     
     The most common method for cooling a ship's diesel engine has been the "shell & tube" or "plate" heat exchanger method. In this system, dissipated heat is transferred via the tube-bank to the raw water that is pumped through the heat exchanger. Inland, coastal and sea going vessels have experienced many problems with corrosion caused by polluted raw water pumped through the cooling system. Additionally, the flow of raw water may become restricted due to the ingress of animal, vegetation or solids. The main advantage of using WEKA boxcoolers is the elimination of pumping raw water through he cooling system. The total raw water cooling system with sea water pipe work, filters, sea water pumps, etc. becomes redundant and sea water does not enter the engine room.
     
    What is a boxcooler
     
    The principle of boxcooling is the following:
    Cooling water is forced through a number of tubes in a tubestack, which are installed in a seachest. The seachest is provided with inlet and outlet openings (grids). The cooling effect is reached by natural circulation of the sea water or by forced circulation due to the speed of the vessel. The sea water is warmed up and rises by its lower density, thus causing a natural upward circulation.
     
    The boxcooler history
     
    The first boxcoolers were used shortly after the second world war. The only application was for river service, and for inland waters. At that time the boxcooler was made of carbon steel, hot galvanised. Many of these coolers are still in use.
     
    The modern boxcooler has been produced since the early 1960's. The Netherlands was the first country to use modern boxcoolers. With additional experience gained, applications included bigger sea going vessels and coasters.
     
    Why boxcooler
     
    Advantages of boxcoolers compared with other cooling systems:
  • eliminating of complete raw water secondary cooling water circuit on board. So there is no need for a cooling water pump, filters, valves, pipes etc. in the ship - parts which are sensitive for disturbances and maintenance
  • the boxcooler is much less susceptible to corrosion and fouling than any other solution
  • boxcoolers are virtually maintenance free. Operation costs therefore are much lower than for any other cooling system
  • boxcoolers are suitable to operation in any kind of water. Their cooling efficiency is not influenced by contamination, dirt, particles, etc. in the water
  • boxcoolers are suitable for sailing under ice conditions. In general there is no danger for damage due to freezing water.
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    If you need more information, please visit to www.weka.biz webiste.