Heat Exchanger
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Heat exchangers transfer heat between hot and cold fluids and come in several types defined by the heat exchange process (direct or indirect), fluid flow direction (parallel, counter, or cross flow), and physical state of the fluids (condensers where hot fluid stays at constant temperature or evaporators where cold fluid does). Common heat exchangers include shell and tube designs with one shell and tube pass, and examples are water heaters, oil coolers, refrigeration cooling sections, deaerators, regenerators, and recuperators.
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Heat Exchanger
A heat exchanger transfers heat from one fluid to another without mixing the fluids by using a solid wall to separate them, and there are two main types of tubes used - finned tubes and bare or plain tubes, with the effectiveness being the ratio of actual heat transferred to the maximum possible heat that could be transferred between the fluids. The document discusses heat exchanger design, components, operation, applications in various industries, experimental plans to compare finned and plain tube performance, budget, and references several textbooks on heat transfer principles and applications.
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1. The document discusses heat exchangers and describes an experiment using a shell and tube heat exchanger. The objectives are to evaluate heat transfer coefficients, LMTD, heat transfer, and heat loss. Water is used as the hot and cold fluids flowing in counter-current configuration.
2. Key aspects covered include types of heat exchangers, theory behind heat transfer calculations, experimental procedures, results which did not match theory due to bubbles, and conclusions that objectives were still met despite non-ideal results.
3. The shell and tube heat exchanger uses water, with hot water inside tubes and cold water in the shell space. Heat is transferred between the streams in counter-current flow. Calculations
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processes management especially in those related
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Heat exchanger
Heat exchangers transfer heat between two fluids without mixing them. They are classified based on their transfer process, number of fluids, construction, and flow arrangement. Direct transfer heat exchangers allow simultaneous flow of hot and cold fluids separated by a wall, while storage heat exchangers alternately flow hot and cold fluids through a porous matrix that stores and transfers heat. Direct contact heat exchangers have no separation between fluids, instead bringing a gas and liquid directly in contact by bubbling or spraying.
Heat Exchanger
A heat exchanger is a device that transfers heat between two or more fluids without direct contact between them. There are several types of heat exchangers including shell-and-tube, plate, spiral, and double pipe heat exchangers. Heat exchangers are commonly used in industries like waste water treatment, refrigeration, petroleum processing, and aircraft cooling systems to transfer heat between fluids like liquids and gases.
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A heat exchanger transfers heat from one fluid to another without mixing the fluids by using a solid wall to separate them, and there are two main types of tubes used - finned tubes and bare or plain tubes, with the effectiveness being the ratio of actual heat transferred to the maximum possible heat that could be transferred between the fluids. The document discusses heat exchanger design, components, operation, applications in various industries, experimental plans to compare finned and plain tube performance, budget, and references several textbooks on heat transfer principles and applications.
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All what you need about Heat Exchangers.
Basic définitions
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Heat exchanger
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Feature of Heat exchangers
Inspection and cleaning of Heat exchangers
Heat exchangers
Heat exchangers transfer heat between two or more fluids that are at different temperatures. They work by bringing the fluids into thermal contact through a conducting surface while preventing mixing. There are several types of heat exchangers classified by their heat exchange process, fluid flow direction, mechanical design, and physical state. A common type is the shell and tube heat exchanger, which consists of a shell with a bundle of tubes inside. One fluid flows through the tubes while another flows over the tubes to transfer heat between the fluids. Double pipe heat exchangers are a simpler design with one pipe inside a larger pipe, allowing fluids to flow within and between the pipes.
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Heat exchangers transfer heat between two or more fluids. There are three main types: direct transfer, storage, and direct contact. Direct transfer type heat exchangers simultaneously flow hot and cold fluids through a separating wall. Storage type heat exchangers alternately flow hot and cold fluids through a porous matrix. Direct contact type heat exchangers do not separate the fluids. Common examples are plate heat exchangers and shell-and-tube heat exchangers. Design considerations include materials, operating parameters, fouling factors, and determining the required heat transfer area.
15 heat transfer
This document provides an overview of heat transfer and related topics. It discusses the three methods of heat transfer: convection, conduction, and radiation. It also covers factors that affect heat transfer like temperature and thermal resistance. The document outlines course contents on heat transfer equipment, fired process equipment, and combustion of fuels. It provides details on topics like heat exchangers, boilers, burners, and methods of heat exchange.
K012627075
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. A computational fluid dynamics (CFD) analysis was conducted to determine the effect of varying parameters like inner tube diameter, mass flow rates, and flow configuration (parallel vs. counter flow) on heat transfer characteristics. The CFD results showed that decreasing the inner tube diameter and increasing the mass flow rates led to higher overall heat transfer coefficients. Counter flow configuration provided better heat transfer than parallel flow. Validation of the CFD model showed decent agreement with existing empirical correlations for heat transfer in helical coils.
Numerical Analysis of Heat Transfer Enhancement in Pipe-inPipe Helical Coiled...
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. Computational fluid dynamics (CFD) was used to analyze the effect of varying parameters like inner tube diameter, mass flow rates, and flow configuration (parallel vs. counter flow). The results show that overall heat transfer coefficients increase with increasing inner Dean number and mass flow rates. Heat transfer rates also increase with higher inner mass flow rates. Counter flow configuration provides better heat transfer than parallel flow. Increasing the inner tube size decreases the total heat transfer rate due to a reduction in annulus cross-sectional area. Measured inner Nusselt numbers agree reasonably well with existing correlations.
K012627075
This document presents a numerical analysis of heat transfer enhancement in pipe-in-pipe helical coiled heat exchangers. Computational fluid dynamics (CFD) was used to analyze the effect of varying parameters like inner tube diameter, mass flow rates, and coil configuration on heat transfer characteristics. The results show that overall heat transfer coefficient increases with increasing inner Dean number and decreasing inner tube diameter. Counter-flow configuration provides better heat transfer than parallel flow. Validation of CFD results was done using existing Nusselt number correlations from literature. Increasing tube size or annulus mass flow rate decreases the total heat transfer rate.
Heat Exchangers.pptx
heat exchanger is a device that transfers heat between two or more fluids. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. Heat exchangers are widely used in a variety of applications, including:
Heating and cooling systems
Power plants
Chemical processing
Food processing
Refrigeration
Air conditioning
THERMAL ANALYSIS OF DOUBLE PIPE HEAT EXCHANGER USING CFD
Heat transfer equipment is defined by the function it fulfills in a process. On the similar path, Heat exchangers are
the equipment used in industrial processes to recover heat between two process fluids. They are widely used in space
heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, and
natural gas processing. The operating efficiency of these exchangers plays a very key role in the overall running cost
of a plant. So the designers are on a trend of developing heat exchangers which are highly efficient, compact, and cost
effective.
Heat Exchanger
The document discusses unit operations in food process engineering. It describes the objectives as studying principles and laws governing physical, chemical, or biochemical process stages and related equipment. It classifies unit operations into physical, chemical, and biochemical stages involving operations like grinding, sieving, filtration, and fermentation. It also discusses mass transfer, heat transfer, and simultaneous mass-heat transfer unit operations. The document then focuses on heat exchangers, describing types like plate, tubular, and shell-and-tube heat exchangers. It discusses parameters for heat exchanger design like overall heat transfer coefficient, log mean temperature difference, and fouling factor.
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Heat Exchanger
- 1. HEAT EXCHANGER PRASANTA KUMAR BEHERA School of Mechanical Engineering April-2017
- 2. Heat Exchangers and its Types • Heat exchangers are devices whose primary responsibility is the transfer of heat from hot fluid to cold fluid. • Nature of heat exchange process 1. Direct process : ex- Deaerator 2. Indirect process - a) Regenerators , b) Recuperators (ex. Glass melting furnaces) (ex. Air preheater)
- 3. • Relative direction of fluid motion 1. Parallel flow 2. Counter flow 3. Cross flow eEx. Water heaters, oil coolers. Ex. Water heaters. Ex. Cooling section in refrigeration system
- 4. • Design and constructional features Shell and tube a) One shell pass and one tube pass heat exchanger • Physical state of fluids 1. Condensers- In condensers the hot fluid remains at constant temperature and the temperature of cold fluid increases. 2. Evaporators- In this case, the cold fluid temperature remains at constant temperature and the temperature of hot fluid decreases.
- 5. References: • Rajput, R. K. (2014) ‘Heat and Mass transfer’, S. Chand, Vol.7361, pp.574-580. • https://www.google.co.in/search?q=Regenerators+heat+excha nger+images. • https://www.google.co.in/search?q=Parallel+flow+heat+excha nger+images
- 6. Thank you