TABLE OFCONTENTS
Page
SCHEMATIC 5
H102BPhotograph 6
H102B Fitted to H102 ServiceUnit 7
Flowdirection-Countercurrent/Co-current 8
DESCRIPTION - Plate Heat ExchangerH102B 9
Table1Specific Heat capacity Cp of Water in kJ kg-1 11
Table 2 Density of Water in kgLitre-1 12
CAPABILITIES OF THE PLATE EXCHANGERH102B 13
1. DemonstrationOfIndirectHeatingOrCoolingByTransferOfHeat FromOne Fluid Stream To Another When Separated By A Solid Wall (Fluid ToFluid
HeatTransfer). 14
- Toperform an energy balance across aplateheat exchanger andcalculatethe overall efficiency at different fluidflowrates 16
- Todemonstratethedifferencesbetweencounter-currentflow(flowsin opposingdirections）andco-currentflows(flowsinthesamedirection）andthe
effect on heat transferred, temperature efficiencies and temperatureprofilesthrough aPlate heatexchanger 20
- To determine the overall heat transfer coefficient for aplate heatexchangerusing the logarithmic mean temperature difference toperform thecalculations
(for the counter-current and co-currentflows). 25
- To investigate the effect of changes in hotfluid and coldfluid flow rateon
thetemperatureefficienciesandoverallheattransfercoefficient. 35
- To investigate the effect of drivingforce (difference between hot streamand coldstreamtemperature)with counter-currentand co-currentflow 44
SYMBOLS ANDUNITS
Symbol Units
VcoldCold stream flow rate gramss-1
Vhot Hot stream flow rate gramss-1
Tl Hotfluidinlettemperature ℃
T2 Hotfluidoutlettemperature ℃
T3 Coldfluidinlettemperature ℃
T4 Coldfluidoutlettemperature ℃
△thotDecrease in hot fluidtemperature K
△tcold Increase in cold fluidtemperature K
dThot Decreaseinhotfluidtemperature K
dT cold Increase in cold fluidtemperature K
NNumber of heat transfer plates with hot and cold fluid on both sides -
Tmean Meantemperature ℃
p Density of stream fluid kg litre
Cp Specific Heat of streamfluid kJkg-1K-1
Qe Heat flow rate form hotstream Watts
Qa Heat flow rate to coldstream Watts
Qf Heat loss tosurroundings Watts
LMTD Logarithmic mean temperaturedifference K
FLMTD correction factor for plate heatexchanger -
AHeat transfer surfacearea m2
a Projected area of each heat transferplate m2
UOverall heat transfercoefficient Wm-2K-1
nThermal Thermal efficiency %
nhot Temperature efficiency hotstream %
ncoldTemperature efficiency coldstream %
nmean Mean temperature efficie %
dTmax Maximum temperature difference across heatexchanger K
dTminMinimum temperature difference across heatexchanger K
DESCRIPTION - Plate Heat ExchangerHl02
The plate heat exchanger is extremely versatile and exhibits one of the most efficient heatexchangerdesigns in terms of its capacity relative to its volume. In addition, somedesigns allow on-sitevariationofcapacitybytheadditionorremovalofplatecombinations.
The plate heat exchanger finds application in the food processing and chemical industries wheredifferentcombinations of plates and gaskets can be arranged to suit a particular application.
Brazedconstructionisusedwithintherefrigerationindustrywherecompactevaporationorcondensation ofrefrigerantisrequiredinassociationwith heatingorcoolingofsomeothermedium.Anexampleof theuseofaplateheat exchangeroccursintheHiltonAirandwaterHeatPump R832.Detailsareavailable from P.A.Hilton Ltd or their local agent onrequest.
The Hl02B Plate Heat exchanger is a 4-plate brazed model that demonstrates the basic principles ofheattransfer. The H102B is designed to be used with the Heat Exchanger Service ModuleH102.
Theheat exchangerismountedonthepanelfascia,supportedbytwopegsandretainedbyareleasable cabletie.Thelsquo;Hot side#39;self-sealingplugsareontheleftandthelsquo;Coldside#39;socketsontheright.Oncefitted, the Hl02B may remain in place. Customers in possession of the Hl02A Concentric TubeHeatExchanger should fit the Hl02B Platefirst.
ThedetaileddesignofthecomponentsareshownontheSchematicdiagram.Eachplateiscorrugatedto promoteturbulenceandisperforatedtoallowthehotandcoldstreamstoremaininsealedpassageson oppositesidesoftheplatesandallowthetransferofheat.Itisthecombinationofturbulence,low volume,highsurfaceareaandhigh fluidvelocitiesthatgivethehighheat transfercapacityinasmall volume.
Innormaloperation,hotwater fromtheheater/circulatorflowsviathelsquo;HOTOUTrsquo;braidedhoseintothe upperlsquo;Hotside#39;c
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