Air is heated whenever it is compressed. The air reaches approximately 100 °C in an oil-lubricated compressor, and 200 °C in an oil-free compressor. The large difference in volume flows between the air and coolant sides means that this application has traditionally been dominated by the naturally asymmetric Shell & Tube technology. Today, however, compact installations using SWEP brazed plate heat exchangers (BPHEs) are available. This easily reduces the outlet temperature to less than 10 °C above the ambient temperature in oil-lubricated screw compressors (oil-free compressors still often use Shell & Tube technology). Oil coolers are used on almost all compressor types (piston, screw, centrifugal) and even for the transmission oil in oil-free compressors. In oil-lubricated screw compressors, which dominate the market, the oil lubricates and cools the moving parts, and cools the air. In a typical two-stage screw compressor, an oil curtain (or oil spray) acts alone as the intercooler for the air from the low-pressure stage. Copper-brazed heat exchangers are suitable for all oil types operating at up to 95 °C.
Our BPHEs are used in oil/air coolers and for heat recovery. Our unique solutions include the B60, B30 and B35T, as well as 100% stainless steel models. There are many reasons for using our 100% stainless steel BPHEs in this application. Maintenance intervals are longer because the compressor oil is not contaminated by copper at high operating temperatures. In installations subject to vibration, their fatigue properties make them superior to nickel-brazed units. Finally, they are ideal for operations in corrosive environments. End-user applications include pneumatic automation, energy storage, air tools, spray painting, PET blow molding, and gas dusters for cleaning electronic components.
The B85 is a highly efficient heat exchanger with a higher thermal performance than any comparable product. The B85 is the perfect choice for high-performance condensers and demanding heat transfer requirements. The large ports enable it to cope with high capacities. A smaller pressing depth,…
The B30 is an asymmetric cross-flow heat exchanger. It is particularly suitable for gas-to-liquid applications and for tapping tributary flows from main streams. With 2½″ piping, it handles water flow of up to 58 m³/h (255 gpm). It can be used as a suction gas heat exchanger in chillers of up to 350…
The B35T is ideal for many applications in district heating, heat recovery for industry, HVAC, combined heat & power and engine oil cooling. It is the perfect choice for efficient heat transfer with a low pressure drop in systems with up to 2½″ piping and 58 m³/h (255 gpm) water flow.
The B120T has been specially developed to operate in demanding heating and industrial applications, typically water-water applications and oil coolers. The product has contributed to the rapid switch to BPHEs from traditional gasket plate heat exchangers and shell-and-tube solutions. It is widely…