A waste heat recovery unit (WHRU) is a heat exchanger that recovers heat from a hot gas stream while transferring it to a working medium, typically water or oils. The hot gas stream can be the exhaust gas from a gas turbine or a diesel engine or a waste gas from industry or refinery.

Shell and tube heat exchanger is used in various industrial process applications because they can perform tasks such as: Removal of process heat and feed water preheating. Cooling of hydraulic and lube oil. Cooling of turbine, compressor, and engine.

Air–cooled heat exchangers (ACHEs), sometimes called air coolers, are used in refineries, petro-chemical plants, gas treating plants, compressor stations, power plants, and other facilities. ACHEs are used for process cooling and/or condensing. … Often, these processes are critical to the operation of the plant

Oil Cooler. Oil cooling refers to a process whereby heat is displaced from a ‘hotter’ object, into a cooler oil and is the principle behind oil cooler devices. The oil carrying the displaced heat usually passes through a cooling unit such as a radiator or less commonly a gas decompresser.