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Design and Application of TWISTED TUBE ® HEAT EXCHANGER
Conventional baffled shell-and-tube exchangers, while having an excellent record of acceptance and functionality, have some notable limitations. In particular, the shell-side path is wasteful on pressure drop, limits maximum thermal effectiveness and encourages dead spots where fouling or corrosion may occur. This paper describes an advanced shell-and-tube design, known as the TWISTED TUBE ® Heat Exchanger, which is inherently able to overcome these limitation in addition to providing the further advantages of tube-side enhancement and good tube support to reduce susceptibility to vibration. The paper compares the Twisted Tube ® exchanger with conventional designs and with other advanced designs.
CALCUATING LIQUID REGIMES
This article was printed in Hydrocarbon Engineering magazine dated April 1999 and describes the flow of non-Newtonian fluids in heat exchangers.
Driven by competitive market forces and stricter environmental compliance, the whole question of chemical plant energy consumption is receiving renewed attention with an eye towards: 1) process changes through the use of new heat transfer technologies2) heat recovery and pinch technology3) accurate fouling prediction and reduction4) increasing plant throughput. This paper will re-examine the basic principles of economical heat transfer as it relates to the issues listed.
HEAT TRANSFER TECHNOLOGY
This article appeared in the October 1997 issue of The International Journal of Hydrocarbon Engineering, and examines the basic principles of economical heat recovery, with relation to both overall plant energy efficiency and the application of pinch technology, which assures maximum energy recovery.
TARGET FOR COST EFFECTIVE HEAT RECOVERY ENHANCEMENTS.
This paper was prepared for presentation for the CE Expo Conference in Houston, Texas in June, 1999. Today's low energy costs result in many projects for energy reduction being insufficiently attractive to justify their installation. The payback times for such projects may be unattractive due to the need for piping modifications to install new exchanger area. This paper presents a simplified analysis of a project to install high performance tube bundles into existing shells with no piping modifications. It uses a crude unit heat train as an example. It further introduces a new Pinch concept which is used to identify the optimum choice of exchanger bundles to be replaced.
TEATING OF TWISTED TUBE ® EXCHANGERS IN TRANSITION FLOW REGIME
This paper describes testing of advanced shell and tube design with TWISTED TUBE ® Technology.
TWISTED TUBE ® HEAT EXCHANGER : TECHNOLOGY AND APPLICATION
This article was presented at the November 9th, 1999 "Latest Advances in Offshore Processing" conference in Aberdeen, Scotland. Heat exchangers are usually classified by the compactness factor in m2/m3 and it is generally accepted that values greater than 700 m2/m3 characterize compact equipment. Although shell-and-tube exchangers can have high a compactness factor, compact heat exchangers are often referred to as non-tubular devices. This paper describes an advanced shell-and-tube heat exchanger using twisted tubes. Recent advances in the range of design and operational reliability have made twisted tube heat exchangers attractive in various industries, including offshore application. Taking into account size and convenience considerations, these exchangers can be cost effective in a wider range of applications than the niches currently being used in the process industry.
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