Heat Exchangers

Around the mid-1950s, large brazed aluminium plate and fin heat exchangers were commercially introduced. They readily became the heat exchangers of choice for cryogenic air separation and liquefaction plants. In this type of heat exchanger, corrugated fins are sandwiched between plates to form a passage for gas flow. The use of fins provides increased surface area for heat transfer. Typical fin heights range between 5 and 9 mm; fin spacing can be as low as 1 fin per mm. A heat exchanger block is formed by stacking passages. Generally, flow through individual passages is countercurrent with a warming stream in one passage and a cooling stream in the adjacent passage. A heat exchanger block can easily handle multiple warming and cooling streams. Plate and fin heat exchangers are applied in virtually all the heat exchanger services of an air separation plant. They are used as main heat exchangers, reboiler-condensers and subcoolers. The maximum size and pressure rating of these heat exchangers depend on the manufacture; however, heat exchangers 1200 mm wide by 1200 mm stack height by 6000 mm long with a pressure rating up to 50 atm can easily be found. For large size plants, multiple heat exchangers are used in parallel and careful attention is paid to the flow distribution in the manifolds.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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