89641188-Microchannel-Heat.pdf

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MICROCHANNEL HEAT

EXCHANGER

PREPARED BY

ANAND R.NADGIRE

F.Y.M.Tech(MIS No. 121025015)

2010-11

MICROCHANNEL HEAT EXCHANGER F.Y.M.Tech(C.O.E.P)


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n a ur za onmicrochannel

conceptMiniaturization :-

Process of making something very small

using modern technology

Microchannels :-

Micro refers to something small than

usual considering particular scale

Channels refer to passage of flow



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OVERVIEW

Microchannel exchanger definition

Manufacturing of Microchannel Hex

Performance parameters and comparison

Microchannel technology advantages

Implementation Challenges



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Microchannel consideration :

Mehandale etal :

Flow in terms of channel dimension Cd

1 m< CD < 100m: Microchannels

100m< CD


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Microchannel Hex definition

MICR OCHANNEL HEAT

EXCHANGERF.Y.M.Tech(C.O.E.)


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Manufacturing of mHex

MICR OCHANNEL HEAT EXCHANGERF.Y.M.Tech(C.O.E.P)


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Performance:

Higher heat transfer coefficients



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mHex performance comparison



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er ormance :Manageable pressure

drop



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er ormance :Increased volumetric heat

flux



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Advantages :

Higher performanceHigh volumetric heat fluxModest pressure dropCompact hardware for space criticalapplication

Robust designProven manufacturing process

Demonstrated mechanical integrityScalable technologyRepeatable designEffective flow distribution



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Implementation challengesCost

Reliability



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Cost :

Overall cost determined by

Equipment costs

Installation costs

Process productivity

Attractive costs for application that

Require expensive material of construction,

e.g. nickel allot steel ,alluminiumInvolve multiple streams

Demand close approach temperature



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Reliability :

Three performance aspects impact reliability

Fouling/plugging

Service

Particulate sizeSurface chemistry

Solid content

Corrosion

On-stream factor

Frequency of servicing

Maintenance access



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Conclusion :

Microchannel provide high heat transfer

coefficient because of their small hydraulic

diameter

Though the implementation method iscostly but its performance allow to use it

effectively

Reduction in mass and volume allows it to

use in various applications



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Future work

Thermal view of the microchannel heat

exchanger



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Referenceswww.velocys.comR.K.Shah & D.P.Sekulic ,Fundamental of

heat exchanger design, John Wiley & sons,2003.

D.B.Tuckermann,R.F.W.Pease,High

performance heat sinking for VLSI,IEEE electron

device letters.

N.T.Obet,Towards the better

understanding of friction and heat/mass transfer

in microchannelLiterature review ,Microscale

thermo physical engg.

www.nasa.govMICROCHANNEL HEAT EXCHANGER F.Y.M.Tech(C.O.E.P)
http://www.velocys.com/http://www.velocys.com/http://www.velocys.com/http://www.velocys.com/http://www.velocys.com/http://www.velocys.com/


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89641188-Microchannel-Heat.pdf

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