Project Fall 2014

8/10/2019 Project Fall 2014

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MECE 463 Thermo-Fluids Systems Design Instructor: M. Secnell

8ind S/eed: 6. mull? cst in /lce concrete $sement. 7ssume $sement 1ll height o %.44m nd

tht the /ortion o the $sement $o#e grde is '.6m. This does notmen tht the /ortion o theconcrete $sement $elo1 grde le#el is &.53m s you must ccount or the thic2ness o the loorssem$ly.

Finished grde is '.6m $elo1 to/ o concrete 1ll nd is slo/ed to llo1 1ter to drin 1y rom the

structure. Soil therml conducti#ity is ssumed to $e &.4 8


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The $seline house hs the ollo1ing construction or the $uilding en#elo/e:

&. *sic construction o $o#e grde 1lls:. &%. mm gy/sum $ord

$. 4 mil /olyethylene ir


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c. Footing sie 4'6 mm 9&6 in 1ide! %'3 mm 95 in thic2d. 8ll height 9mesured rom to/ o ooting %44' mm 96 ine. Concrete! /oured! loor thic2ness &'' mm 94 in. Goured in inside $sement 1lls! $ottom o

loor t to/ o ooting le#el.. Interior height 96-4B% in

g. "ote: (n the section $o#e grde! stucco 9snd ggregte! %0 mm thic2 9ssume kstuccoB'. 8


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In the home design! continuous locl eAhust #entiltion ns re instlled in the 2itchen nd $throoms.For siing! the 2itchen is ssumed to h#e loor re o &% $y &3 eet. The locl eAhust #entiltionns /ro#ide the necessry minimum totl #entiltion re+uirement! so no other n is instlled in thehome.

For your het loss clcultions! com/ute the #entiltion nd eAiltrtion rte or the gi#en systemJ nd!ssume tht iniltrtion is minly rom doors nd 1indo1s. 7ssume the 1ind direction is south-1est.

)ote:*oth 1ind nd /ressurition eects must $e ccounted or. For @ B %.'! the ollo1ing eA/ressioncn $e used to o$tin the iniltrtion lo1 rte:

In-iltrtion rte='.'0(Gressure dro/)'.5 1here iniltrtion rte is in


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/. *eminar $: Duct0or layout+ register flo0 rates and furnace siing and selection

(nce you h#e inished nlying the het lods in the $uilding en#elo/e! you re redy to strt designing thehouse heting system. In order to do so! you 1ill need to go o#er the ollo1ing stges:

Gredict the sie o your urnce using the het lod clcultions.

*sed on the het loss in ech one! estimte the lo1 rte to ech room nd the totl lo1 rte. M2e

sure tht your urnce cn /ro#ide the desired totl lo1 rte. @ee/ in mind the tem/erture rise in theurnce nd the mAimum /ressure dro/ in the duct1or2 9most urnces h#e #ri$le-s/eed ns!thereore you only need to 1orry $out m2ing sure the /ressure dro/ in the duct1or2 does not rech the

mAimum llo1$le /ressure dro/ the n cn /ro#ide. Design the o#erll duct1or2 lyout $sed on the totl lo1 rte nd the lo1 rte to ech room.

7t the end o this seminr! I 1ould li2e you to su$mit:

&. 7 t$le 1ith the het loss or ech one in the household.

%. our estimted o#erll het loss nd energy consum/tion or the household.

3. 7 /reliminry lyout o the duct1or2.

The rule o thum$ or siing your urnce is tht the minimum heting system c/city shll $e &.%0 times thedesign het loss. Since you h#e lredy nlyed the het losses in your $uilding en#elo/e this #lue is redily#il$le. =se this num$er to select urnce rom ny urnce mnucturer such s oodmn K&L! Trne K%L orennoA K3L. Select urnce tht is eicient nd yet not too costly.

*sed on the urnce c/city! the urnce s/eciiction sheet should tell you 1ht the lo1 rte o the urnceshould $e. Most smll urnces /ro#ide mAimum lo1 rte o $out &!''' CFM nd cn /ro#ide /ressuredro/ o t most '.5? 1.c. 91ter column! i.e. $out %''G. For the design o the heting system in your home!use the //ro/rite lo1 rte rom the urnce ctlog.

(nce the design lo1 rte hs $een selected! the strting /oint or determining the duct1or2 lyout orresidentil $uildings is usully to clculte the rction o the lo1 rte tht should go to ech one. The lo1

6

'igure $: *ample duct0or for residential housing


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rte to ech one 1ill de/end on the het loss or tht one. The totl urnce lo1 rte o hot ir should $edi#ided t2ing into ccount the /ercentge o het losses or ech heted one.

The neAt ste/ is to locte the ir outlets 9register nd return inlets 9grilles nd to crete the lyout o theduct1or2. There is no restriction on the num$er o loor registers $ut there should $e minimum o one /er

room. In order to minimie noise! the ty/e nd sie o the registers is #ery im/ortnt. For this /ro)ect! it isssumed tht the sme register is used t ll the outlets nd tht ech register should not crry more thn &''CFM. I you need to /ro#ide more thn &%0 CFM to room! you 1ill need to instll se#erl registers nd s/litthe lo1 rte e#enly $et1een the registers. *oth su//ly 9hot ir to the conditioned s/ce nd return 9cold ir$c2 to the urnce ir systems re re+uired in household. It used to $e tht /eo/le )ust cut the doors shorternd centrlly locted the return ir int2e. E#en though this is no longer done! for simplicity, we will assumethis is the case for the project so that you only need to design the supply ductwork and not the return

ductwork.

For the su//ly system! the most common lyout is to h#e the urnce centrlly locted in the $sement! su//ly /lenum connecting the urnce to the min duct! nd min rectngulr duct hnging rom the $sement

ceiling. This min duct su//lies ir to round /i/ing 9/lced $et1een the loor )oists tht deli#ers the hot ir tothe registers 9see Figure 3. In stndrd ir distri$ution system! registers re locted under ech o the1indo1s in the $uilding to hel/ 2ee/ the 1indo1s cler o condenstion during #ery cold 1ether. To/ t2e-oittings 9see Figure 3! 1hich llo1 connection o 4! 0 or 6 inch dimeter round /i/ing or loor $oots or loorregisters! re used to connect the $rnch to the min duct.

2. *eminar ,: Duct0or siing and balancing

The gol o this seminr is to sho1 you ho1 to: Sie the duct1or2 $sed on the e+ul-riction method.

*lnce the system using dm/ers.

Chec2 tht the totl /ressure loss is //ro/rite or the urnce selected.

7t the end o the seminr! I 1ould li2e you to su$mit the ollo1ing:

Estimted lo1 rte to ech room.

Finl lyout o the duct1or2.

(nce you h#e o$tined the duct system lyout nd the lo1 rte to $e deli#ered to ech one! you cn strtthin2ing on siing the duct1or2. In order to design the heting system! you must ind the sie o the min ndech $rnch o the su//ly. ou 1ill lso need to sie the /lenum nd the t2e-o. =se the e+ul-riction methodto determine the sie o ech $rnch using desired /ressure dro/ o $out &.0 G


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register


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Duct lyout nd hot ir lo1 rte distri$ution:

9'.0 Determine the urnce c/city nd select n //ro/rite urnce. For the s/eciic urnceind the mAimum lo1 rte nd use the #lue to sie the duct1or2 9Gro#ide the urnce techniclsheet in the //endiA nd )ustiy your selection.

$ 9& Determine the lo1 rte to ech heting one in the house 9Gro#ide sm/le clcultions.

c 9& Determine the /osition nd lo1 rte to ech register in the house. Crete summry t$lesho1ing the lo1 rte to ech register.

d 9'.0 Determine the lyout o the su//ly nd return duct1or2 system or the min loor nd$sement 9$oth ir su//ly nd ir return. Crete lyout digrm sho1ing the su//ly duct1or2or min loor nd $sement including l$els or ech register! lo1 rtes nd dimension.

Duct siing nd $lncing:

9% Sie o the duct1or2 or the su//ly. Sie /lenum! min nd ll $rnches 9Gro#ide sm/leclcultions. Crete t$le 1ith ll the duct runs 9$oth min nd $rnches nd sho1 the sie oech $rnch.

$ 9% Determine the /ressure loss on ech $rnch nd determine the necessry loss coeicient t

ech dm/er in the $rnch 9usully locted $y the register to $lnce the system. Crete t$le1ith the dm/er /ressure loss! loss coeicient nd /erture ngle 9ssuming CD-& $utterlydm/er 1ith D


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4. References

K&L htt/:

Project Fall 2014

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