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Co-generation engine cooler

There are different ways to make electricity. In this case a combustion engine, driven by natural gas, is used.

The groupname for these kind of systems is co-generation engines and they can, for example, be utilized as back-up power in airports or other places where electricity cut-off or heat loss is strictly unwanted. BPHEs are very suitable for taking care of the heat evolved during the operation of a co-generation engine.

This engine is produced by MDE, Germany. The product range of this company comprises natural gas- as well as biogas driven engines with capacities from 40 to 370 kW.

The problem
During operation, the engine has to be cooled down to avoid over heat. In this engine, an ethylene glycol-water mixture serves as the cooling fluid. The heated ethylene glycol must then be cooled, but how?

The solution

In this co-generation plant a SWEP B50Hx110 is used to cool the ethylene glycol circuit. The heated water on the secondary side of the BPHE is then led into a radiator water circuit, which is used to warm a plant, farm, couple of houses or whatever the heating demand is.
Thanks to the compact brazed heat exchanger, the heat can be transfered from the ethylene glycol to the heating water without losses in a very efficient way. Since the stainless steel plates of the BPHE are pressed as a herring bone pattern, the turbulence in the heat exchanger unit is close to optimal. The turbulence of the fluids favour the thermodynamic efficiency, so that the BPHE can work with very low temperature difference.

System description
BPHEs are excellent for cooling both jacket water circuit and engine lube oil but the heat from the exhaust gases has to be utilized in a special heat exchanger due to the very high temperatures