8/6/2019 ME 415 Assignment 1

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2.

trJ.

4.

5.

ME 4L5: Refrigeration and Building MechanicalSystems

1. An ideal R134a chiller operates with a condensing temperature of 45'C and an eraporatortemperature of 2"C. If the cooling rate is 20 tons, what are the refiigerant fl.o"v rate,condenser pressure. evapola[or pressure. COP. EER and k\\'/ron?1.1$o)f'1Pa o-sttrOtMpa b.LtZ' t,,c; 0.6.48 o.5r+ r

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Pnoblom I

Givelt, k,:Tz- 4O"cfi-Ta- 2'c

Gorz. e4VL ,

From, Table,

IZofrigerotb: R,lb\a.

9u: 20 bons/da6: 20 ry: * lgoot'

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It @Pe&Tr_ tL2- 424-85 t 70.32: n (eso.a7 - z63.9o)+ rn= O.517 xg/sNin

=+ lAin: 12.96 kncoP: #- o.42 70.e2xl20ooEER.,- ?rin 6TU/lrr _ - o.ot6Nin in N t2.g^6xtoa: lB.5z

t 2.96L

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ProbLom 2

Conside ring bhe \nbercooli ngDemperAb*re Ao"cAlo/u, 4: ltrtrc(U- 0,)-) *- O.o4275

RtE : m (t-x,) (/o,- e.d : 5o+ m: o.tOkgls

R'ofri6eranbr A m rnanla-From,Table"

4 ht: l45g.9ka/ugSr:5.C-8^49 Ail/u,A;nItt: I 304 'a 3kd /"8h's: 14 66 kdl kVs3 : 4. g +2 85 uil/ugN

U= tOo8,O kil/r

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Pro blom 3l2,Of riger anD : RJ I 64 o.From, fablq

hF 382.6 zil/QSr: l.74TO k8/kgKLz: 4o.% t

8/6/2019 ME 415 Assignment 1

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Problom 4

Given , T:74: 20" cPb: I'2 MPam - bkE/mir, : o'o5 k/s

Gov. oald9r= rn (hLa h4)lA)'tr1 : ,it (A.- q)

From, Tabl.e, h,@7, , gr,: 1459. g aillz

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Problam 5(o) rh: l k6l rfin:O.ot67 k{S

ttuE: ri(lt,-A4Ni n = i. (/rr- /.)CoP: R'E' Ninhr: 09A.6 kil/kg51:S2: 1.7271 kil/^g-K

Tcond Ltq:2t4 P(ur"J 14-, fuE Ni'. coPzo 227 4+ o.51 4 to.O4 2.46 o-2 14.5z4 237.V' o.65 4t2.45 2.76 O.23 l228 298,84 o."3 4t4.5 2.67 o.27 log2 244"62 o.8z 4t6.a6 2.57 o.3l 4.5z6 250.44 o.gt 4tg.o 2.4V o-45 74a 256.4t l.o2 42t.46 2.97 o3e 6.344 262.43 1.rc 425.45 2"24 o.45 54e 26.8 .53 l-25 4zz.az 2.t7 o.4a 4.550 2vt-62 l.gL 492.25 2.lz o.56 e-8

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(r")d : / kfl aiw o. ot6? kgls

ltuE: m@,-A/iNirt : fn (hf- 2L)6P= PENjrt/"e:hrt- 241. .72 k3/xg

8: o.77 MPo-'Tatp A.t sr 0t, RJE lAi r'r e-oPo5 4rc.teg 1.7t275 4t4.t82 2.93 &34 4rc-Tz t.7 r3l 4t4.2s 2. 92 *3o 4t4.A2 t.7t45 4tq.72 2-ag &26 4t2.8\ t.7l5g hts. te 2.86 o.o4 7322 4t6.79 1.7t73 4ts.ot 2.92 o.oe b6IB 4oe.og l.vt3a 4t6.Os 2.79 o.t2 23l4 406.53 1.7204 4rc.e3 2.V5 o. t7 t6.5/o 4o4.Oz 1.722t 4t7. 05 z.Z 2 o.2t t36 4oz.o6 1.724c, 4 t7.64 2.68 o.26 to2 o9g.+t 1.726'A 4tg- za 2,64 o_8t 4.5o gga.GO l.+27t 418.6 z.62 o.a% v.8

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MlcRo @ 20cmx25cm

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Roll No.

@ 20cmx25cm

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Problem 6

From,Tabte, ht: g8+. al uil/t