File Name: heat transfer in concurrent and countercurrent flow in pipes .zip
Romina Ronquillo. Heat exchangers are devices designed to transfer heat between two or more fluids—i. Depending on the type of heat exchanger employed, the heat transferring process can be gas-to-gas , liquid-to-gas , or liquid-to-liquid and occur through a solid separator, which prevents mixing of the fluids, or direct fluid contact. Other design characteristics, including construction materials and components, heat transfer mechanisms, and flow configurations, also help to classify and categorize the types of heat exchangers available. Finding application across a wide range of industries, a diverse selection of these heat exchanging devices are designed and manufactured for use in both heating and cooling processes.
Heat and Mass Transfer pp Cite as. Heat exchangers have been classified in various ways. Double pipe, and shell and tube heat exchangers are most widely used. This chapter deals with heat exchanger fundamentals and design of heat exchangers. Heat transfer equation for double pipe heat exchanger has been presented and log mean temperature difference LMTD has been defined in Part 1 of the chapter followed by derivations of equations of LMTD for parallel flow and counterflow exchangers.
Impact Factor. Contact Us Click Here. Page Number Share This Article. ISSN Abstract In heat exchanger heat is transfer from the higher to lower temperature difference and transfer of heat is an important aspect of the heat transfer application. The efficiency is depending upon the amount of transfer heat and mode of heat transfer.
It is common knowledge amongst heat exchanger designers that a counter flow heat exchanger installation is more efficient than the parallel flow alternative, but for everyone else it can be a bit of a mystery. In this article we will explain what counter flow is and why it is more efficient than parallel flow. First we need to understand what the differences are between counter flow and parallel flow. As a brief description; the term refers to the relationship between the flow directions of the hot and cold fluids. With parallel flow the fluids are travelling through the heat exchanger in the same direction where as a counter flow installation will have the fluids flowing against each other in opposite directions. The diagram above shows a Shell and Tube Heat Exchanger. In the counter flow setup, the fluids are travelling along the heat exchanger in opposite directions.
The most common arrangements for flow paths within a heat exchanger are counter-flow and parallel flow. A counter-flow heat exchanger is one in which the direction of the flow of one of the working fluids is opposite to the direction to the flow of the other fluid. In a parallel flow exchanger, both fluids in the heat exchanger flow in the same direction. Figure 9 represents the directions of fluid flow in the parallel and counter-flow exchangers.
Bag X, Alice , South Africa. Heat exchangers are widely used for heat recovery purposes in many industrial applications such as gasification systems. In a biomass gasification system situated at Melani village in Eastern Cape of South Africa, a significant quantity of heat energy is lost during syngas cooling. Thus, a heat exchanger was constructed and installed in the gasification system for the purpose of heat recovery.
Спутница? - бессмысленно повторил Беккер. - Проститутка, что. Клушар поморщился: - Вот. Если вам угодно использовать это вульгарное слово.
Ради всего святого, зачем вы это сделали. Чтобы скрыть свою маленькую тайну. Стратмор сохранял спокойствие. - И что же это за секрет. - Вы отлично знаете это. Это Цифровая крепость.
Мы узнали об этом лишь благодаря оперативности КОМИНТа. - Стратмор внимательно посмотрел не. - Я должен найти его партнера, прежде чем он узнает о смерти Танкадо. Вот почему я тебя вызвал. Мне нужна твоя помощь. Сьюзан плохо его понимала. Ей показалось, что столь своевременная кончина Танкадо решила все проблемы.