درباره سازنده

Tranter traces its origins to automotive pioneer R.E. Olds, who founded a firm in 1932 to manufacture eutectic plates for refrigerated delivery trucks. Headquartered at a plant located in Lansing, MI, USA, the company was purchased by J.R. Tranter five years later. In the late 1940s, the firm developed PLATECOIL® Prime Surface Heat Exchangers as immersion heaters or coolers and as exchanger panels integral or attached to process vessels.

In 1967, the company acquired a plant in Wichita Falls, TX, adding oil field equipment to its product line. Tranter began the process of relocation from Lansing to this plant. In 1972, Tranter added SUPERCHANGER® Gasketed Plate Heat Exchangers to its line through a licensing agreement. By the mid-1980s, Tranter had moved all production to Wichita Falls and concentrated manufacturing exclusively on the two plate heat exchanger lines. In the 1990s, Tranter’s vision became global with the acquisition of the Sweden-based Reheat and SWEP gasketed plate heat exchanger product lines and their representation network in Europe, Asia and Australia.

Expanding The Global Vision

With the turn of the century, Tranter embarked on a fast-track path to global heat exchange technology preeminence. Bringing to fruition considerable investments in R&D, innovative manufacturing processes, manufacturing capacity and acquisitions, the company has added product lines and geographical presence during the first decade of the new century. This includes acquisitions of distributors in China and Poland, start-ups in Brazil, Middle East and Russia, and a focus on building or acquiring Service Centers in all major markets.

The acquisition of German shell & plate manufacturer Pressko in 2008 added not only a product line but also the seed of a Welded Competence Center. Subsequently developed into a test bed for proving advanced manufacturing processes and equipment, the Center’s technology and standards are being replicated in the US, China and India.

Pressure Drop Requirements For Plate Heat Exchangers Technical Article0 pages

نسخه متنی

The

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PRESSURE DROP

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Plate heat exchangers (PHE) contribute to considerable

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energy savings both upstream and downstream

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in many different hydrocarbon processes,

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but whatever the application, there is one

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characteristic that they nearly all share. Any

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technical meeting between a process

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engineer and a heat exchange design

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specialist is likely to involve a discussion

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about the value of the pressure drop

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across the heat exchanger. Process

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engineers prefer to keep the pressure

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drop as low as possible to reduce

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pumping cost and maintain the right

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suction pressure downstream of the

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heat exchanger, while heat exchanger

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designers aim to provide a solution that

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minimises future operating problems and heat

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transfer area and that is often only achievable with

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a relatively high pressure drop.

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The heat transfer requirements clearly have to be met

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in the design of any PHE and the way this is done depends

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on the relative importance placed on cost, physical size

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and pressure drop. By forcing the fluids through the heat

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exchanger at higher flow rates, the overall heat transfer

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coefficient (U value) might be increased, but this also results

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in a higher pressure drop through the heat exchanger

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and correspondingly higher pumping costs. If the

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surface area of the heat exchanger is increased

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the U value and hence the pressure drop

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does not need to be so high; however,

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there may be limitations on the physical

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size that can be accommodated and a

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larger physical size results in a higher

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cost for the heat exchanger.

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Relation between heat

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transfer and pressure

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drop

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Reynolds' analogy is based on similarities

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between heat transfer and fluid friction (which

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causes the pressure drop). The simple analogy

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is correct only for fluids with Prandtl numbers equal to

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one. The Prandtl number expresses the relative magnitude

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of diffusion of momentum and heat in the fluid and thus

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a Prandtl number of one is an assumption that the heat

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and momentum are transported at the same rate. This

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www.hydrocarbonengineering.com

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Reprinted from February2009 HYDROCARBOh ENGINEERING

درباره سازنده

Expanding The Global Vision

اطلاعات تماس

Pressure Drop Requirements For Plate Heat Exchangers Technical Article0 pages

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