Giudice, G. Moncada Lo

Stanzani, F.

English

Purdue E-Pubs

Purdue UniversityPurdue e-PubsInternational Compressor Engineering Conference School of Mechanical Engineering1990Semi-Hermetic Motor-Compressor Unit with theMotor Outside of die Refrigeration CircuitG. Moncada Lo GiudiceRome UniversityF. StanzaniMcQuay EuropaFollow this and additional works at: https://docs.lib.purdue.edu/icecThis document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact epubs@purdue.edu foradditional information.Complete proceedings may be acquired in print and on CD-ROM directly from the Ray W. Herrick Laboratories at https://engineering.purdue.edu/Herrick/Events/orderlit.htmlGiudice, G. Moncada Lo and Stanzani, F., "Semi-Hermetic Motor-Compressor Unit with the Motor Outside of die RefrigerationCircuit" (1990). International Compressor Engineering Conference. Paper 748.https://docs.lib.purdue.edu/icec/748~t:.l'll -Ht:.t:lltoll'- l'il;iiJF:-CCJI·lf~-eS61Jh UIIIT \.liTH rHE dOlOR UUI'SIL•E:. ul' ll;E F:EFRIGERATIUN CIF:~UI1. AIJ1HUR:O ~1no ~Joncada LO GlUdlce. .Franco :=;tan,;::anl. l-l'Ct. !J! rq:q;,Jl.ed l'hetmCdyn.amlCS Ll@pt. or M~chan1cal Eng1neer1ng f.tiJme IJiilV@f"Slt·;, Fc.om~. J taly Fcrm~r Manag111~ 0lLect~r ~lld Gen. Mgr. Me Quay EurDpa 1nc. Ar1cc1a. Rome. Jt~d, .. ABSTRACT fh1s pdp@~ rer~rs to tn~ laboratory tes~a or two motor-compressors: the first 15 a standard one, commonly 1nst~l Jed 1n a1r cond1t1on1ng applications, on the market tor ye~rs. The sec~nd 1$ a prototype. actually a yar1at1on on the r1rs~ ~n~. w1th the el~c~r1c motor assem~led on the shart eKtdnSlon or ~he compress~r. but enLI~eiY segregQted t~om the rerr1g~r~nL s}s~~m. lh@ mctor 1s 1nd1rectJY cooled by the suct1on r~trli~rant vapor tt-~ru a secondary dl.~lectr1c t lu1d, ln wh1ch tt1e moto! 1:; t 1J11y 1mm@rsed lS@e Fi~ure 1J. l'he t~sts oov~r~d a large ran~e or tempe~atures commonlv used 1n comtort a1r condit1oning and 1n perlsh~oie ~ooas r~tr1ge­rat1on rrom l0°C to -ao~c ltrom so~F to -3~.laF>. Eoth motor-ccmpr~9sors have b~@n tes~ed thru startup and ~hutdoun cycles. at d1rt@rent 1nte~va1s. 1n ord~r ta cneck th~ b~hav11Jur at ~1gn1-t1cant trans1ent cond1t1ons. UbJ~~=tLve ot the test program was to comp~re th~ behaviOIJr ot the two motor-comp~@ssors under 1dent1ca! runn1ng condlttons. INTRODUCTION AND BACKGROUND Historically h~rmet1o and sem1-h~rme~1c rnotor-:omfr~~~ot5 wet@ ~~~J@Iop~d to overcom~ th~ press1ng problem or l~bK~ tnrou~~ the rerr1ge~at1on compr~ssor rota~y se~J. fh~ dev~~c~~~~~lt or the r:F( t@ffl~~rants was tn~ determtnant ractor or th@ s~cces~ at th~ hetm~tlc unit &nd th@ deC1lne at tne comp~@ssor dfl'Jen b, ~ separatE! motor. r•:Jrrnll"'g tt-•e ::5o called 1Jp~n J:,'fPe un1t. In spite or th~ outst~nd111g teohnlc&l aev~1apm~nt herm~tlC •Jillt5 a•1d spe~1r1ca1 It or the1r ~le~tc1c 1not~' tlon. motor burnout has been the maJOt cause ot raliUr@ motcr--ct:~mp,~es:sor- wr-.lt:s: a.nd. bY ta&""t the most ~xpens1·.te tu Ut -- h~ )J I' •::J t@ -~ ~ l:it t~h~ r @p4. 1 t. In addl.~Ion ~o the cost ot r~pa1r1ng or rep1~c1ng ~n~ motot compressor UJ,It. 111 tne case ot bucnoutt th@ ent1re svs~am must b= ca.t@tullv oleane.od a.nd all th.e pa.rt1cies or the \oilnd1r1~ l.n~ suiAt1cn removed trom th~ sYstem. Th~ proc@oure th~t J~s ~~c~m­m~nded by rE!ftlierant manutac~urers. in ord~r ~o avotd a ~~~i~p­se't burnou~. was to ev~cuat~ rrom tne svs~~m th~ rerr14~ra1,t artd tt1e 1Ubrl.cAtll,g oil that. ha.d t.:~ be r~ptac~d .:...nynow;'"' the~ to thouroug1y cleAn tn~ syst~m. prer@rab1y Wl.~h R-11. 567 b~ro1~ ;;1'"ta.r~1ng ..Jlt~r~ 1"le1..1 ;~;·etrl;~J:~r~t. t.l~~ tiil..~t 1'" • .9..:.1 L:•e L~pl~~~~ ~~~a a t~mpor~c~ ~wct1~1~ $1~~ r11t~r n~d to oe 11~s~al l~·j. ur.r~~~ ~~ oc~aures t"1ed t.•J be t•jllowed. b:..Jt l,ob.:o.::, cou1.:1 ;u~1~r '~~~ t.r~~ 1.t$e1 r r~m ~ ,·~~ .. biJt liOt.Jt 1 n .:::.. sr~vr t ..:t"11 I~. With th@ Iestr1ct1ons @ntotoed b~· ~!most all t~~ ~esl~t1~ l.,jiJi'lti 1.:-s d:;~.Lns:t ~n:- .!.@le~se or ~...-t=~ rlUli.:IS to th~ en ... lt.~n,n~nt:. 1n tr1~ 'ec~nt vears the problem have b~com~ mor~ ~nd more com~l~x ~1"1~ ,-.~~ ~IS'.:Lf ptOCe!dure 1'"1a:; been @91".abllShe!Ll l.li ca.~e r:,r mor.o~ bu.1.nout. t·h~ re~1111g that a ~~lutton nad to be round. leo to tne ld@a or modliYlng the sernl-nermettc un1~ 1n ord@r to ~eep lts ~d~~nt~~es ~~~1a1n~ th~ pcobl~m ~ep~esentea by the motor lns~al­l@d lrl tne rerr1gerant syst~m. 111 the tast two decades the rotary seal mAnuractur1n~ in-dustry has developed seals WhiCh are tar more reli~bl~ ~nd wea~ c~~l5tent thAn the old oneg. Modern rotaty s~al can b~ regard~d ~s a tool pcoor ~coesso~y also on continues and s~veL~ serv1c@ appl1~at1ons. ~spsc1ally when operat1n~ in st~bl~ And moa~!~t~ temp~r~ture ~ppl1c~t1Dns, with no shart m1sal1gnmen~ str~sses. '['hls l1lng ~nd met1cu1ous de$Crlptl~n ~as n~cess~rY 1n ~r~~' to oons1d~r the 1dea ot addlng n~w components to a macn1ne 1n ~h~ Pl'Gpe!' o,.~ay. !"he ~conom1c 1mpact ~r the above dep1cted modir1oat1on n~s not b~en completely assessed as yet. ma1nly as re~~rds m~~~1n1n~ ~11d ass~mblln~ costs. rhe m~1n addltlonal co5ts ale represented by ~he rota~v ~~at C.lid t.he r.e:at ~xcr.ang@t tplate or other typesJ. t.t'1e 1-sst b~l~-,~ r@~Ulred 1n the larger un1ts. Swb$tant1a1 sav1n~s ar@ ~~pe~ted in the cost or th~ stator. bscause the 1mpregnation ot th@ w1nd1ngs can ~e ~v010eo. Ar~athe! savtn~ w~l 1 tak~ pl~ce becAuse the sophlsticAt~d motor prot~c~l~n Wll 1 be repl~ced by a standard protec~ion tor regular motors. A un1~ue advanta~e orrerect to the customer w1ll b~ the r~ct t~at 1n case or a motor burnout. any elE!'c~rio1an can rept~ce t~e motor w1thout dl~Assemblin~ ~he un1t tram the sygt~m. avo1di1,~ th~ ass1s~~no~ ot A rerr1~~rat1on r~p~1rman. 1n a tractton ot ~he tim~ i"H;.e~:ted 11"'1 conventi1:1nal units. The! compr@~5or is the larg~st s1ngl@ cost 1t~m 1n a f@ttl~~­ratlon 5~st~m lJ. 1t l~ also the maJoc fesponsable ror s~st~ffi ratlur~ shutdowns ano. more speCltlcaJ tv. 1n the s~m1-nerm~t1~ 1Jn1ts. the ~l~ctr1c motor 1g s~a~l5tiCallY th@ most rr~~~~n~ CQ.U::>E!' cr t.;t.ilur·ss. lh~ add1t1ona1 cost or tn~ new mo~or-compressor w111 ~ccordln~ to the ~1:e or ~he un1t: ~nyhow lt ~nould not ~xceeo ~~ ct th~ cogt o~ th~ un1t and th~rerQr~ can b~ r~~a1~ea ~5 ~ prOfltabl~ 1nv~$tm~n~. 568 ctt1~, ~~~~~~-!)~1metlc ~ompr~ss~~. c~n'-~lru~~~~ E!tc. w 1 r_ h s 1m 1 t s r 1 !;;:' ~ 'J 1 t s • suer, ~5 lr.:Jt.ar·,. I W ..,.), T ~: J' 1) l j I t-o! the b~ 1 ... ~.; n ~ t·~~ tr,e modlfiE!!j sak.e .:;.r ~ .:-omplete: ~nd si;-nltlci:!nt comJ.:-·~1 tS•Jn t_ 1 ~Qlt.l,~r~~l .j~~I~rt. ,,::,jmpress,,:,, 1.:=:';t~rioa.r-d Ilt~dE!J · .;;..no 01,~ '~1ototypeJ ~model a!reaov 1n ~he m~rket ~~s se;. 1 e>,::;- ted, !hE! ~r,~totype 1s 1dent1~al to tne ~tan~~rd as r~r ~~ -:om-plessor ~~d mota£ ~re conce~ne~. Whl1~ the motor :r.&m~er ts tt.:~t.a.tl.,~ sepat•.a.te trom the rE!!t:lgerar,lon :;·,rst:.em. br me~ns OJ;" compressor c~s~1ng attera~1on. So th~ suctiOn Sld~ L~trl~~r~t)t p~ss~~ th1'u a JO.cket ror-med all around th~ mot.or ccmpartm~r.t cr the 2omprE!ssor body. fh@ two un1ts have been tested 1n the same testlni racllltles. lnclud1ng measuremen~s, da~a record1ng and proc~ss1n~ svst~m. tn Older to ol:lt.a..tn the most un1rorm tests. It w.;.s 1::lt.-I::J.ded to run the two compressors with the same valve plate. Tne ~odel selected was a 10.56 KW 13TR! un1t. tnat ooesn't l.nc!ude the plate! type heat exchanger Which 1s. ln~t.ead. suppl led to la.rg-@t' COD1Pt'i1SSOC'S. The seocor1dary ne.at.-ex:cnan~@. that necessarliV tak~5 f'l~c~. lii the Frototyp~ do~s not ex1st 1n the 3t~ndard uni~. ~n~ coula hav~ b~~n a negat1ve ractor. 1ncre~s1n~ the motor beyond the operat•ng l•m1ts set by the electric motor ternp12!~T.ur~ supptl~r-.s. ~cope or tn@ ccmp~rat1ve t@St5 was to a$5@S$ the IllCte~s~ ~r the w1nd1ngs ~~mperatut@S du@ to the s~condary he~t ~xch~nge ~1~~ th~ 1nr1u~nc~ on th~ ~hermndynamlc l:lehavtour or th~ fro~~t~~~­oomp.ated Wlth the 5tanda.rd Model. As ment.1on-=·j .atrL~ve. 1n "':h.; ~t~nd~rd Modei the motor 15 cool@d dtreotly by th@ t@t!l~@f~nt rluld.. wh11e tn tt"1@ Prototype the -coo41r,g 1.5 obta.1ne-d. by prCIF•er!\ rnc~It~ln~ th~ 5t~ndard Model. Due to the tact that vapor compression cyclE! rre~u@ntl ~ ap@t~tes 1n t£anSI@nt mod~~ a serl@ ot t@s~s ~as carried ~ut ~o determ111~ the b@Mav1our or th@ two units dur1ng rreguent startup and snutdcwn cycles. TEST FAC!L!TIE!:> rhE! compr-essor-s UN! a773 STANDARD !UN! t~st tacilitt~s ar@ des1gn~d acc~rd11i~ 15 the 1tal1a.n EuL·e.s.w or St~nda.&cs;. i.U ·rr,~y cons1st mainly or th~ rollo~1ng p~rt5: ~ 1.....-a tJ sha.ped tub~. dr-'1 ~xpattSlOri ~v~porar.oc-s. w1r.h control l~d ~Kp~ns1on valves and s1gh~ glasses operatlng cat.~ .:,1rcu1ts. ma.nwa 1 1 ', 1n s~pa~ ~ l..Jti~ 5h~ll and tUb~ dS$1~11 C0\i.dl2-tlS~f Wltl"l OIJII-.J~ln llqUld subcool~r. 569 1 ! , e ~ .=. t ~ 111 1 s ~. h •J 1 CIIJ:; 1"'1 1 ~ 1 r, $ 1..1 1 5 t ~ J usu~1 acc~ssortes such ~s tl1tet drj~l • . ;1 ,~s ... rul ::;~ret'l ~.:cntrols. .ar~~ r1Jc n1st"t-=•.:1 d.l~l ~~ubes. shut 1 he >..tate!f ~ •J( otr1ef llqU1d:. t 10Wlnl!1 ti"'1!U tt"le ~va.pa~·a,l"~o,~1:i .:tli~ -:.onde~-~s.@I lS cont.rollect by preClSlDl"l tlow 'J,:..1ves and rn@tels.. J-.n l. r,SI..J 1::. t.ed t~r1k deo 1 1. ef"S "'~te1~ c.&: 11.:11.1 r ree;;: 11ig p011"1 t 11 "-l.U 1~ 3 r:: d~~ll&d temp@tatures to a small vessel~ th~t keep~ super~~~t~d $1JCtrlOii ..,·apo~ a.t .;;.. set. tE!!mpetature. lhe testlng 9ystem 1s schematio~lly rep~~sent~d 1n F1gur~ ~4 whl~h 1nd1cates the type ot weasurements and s~nsor 1cca~lQJ15. Tests were carr1ed out us1ng a mlcrooomputer b~$~d d~t~ ~~~u1~1t1on system ~lth l~ Analog 1nputs. J~ ~n~ max1mum samplln~ (at~ ~nd 1- b1ts samp11ng accuracy. fhe Ohmlc res1st~nce LS measured by a ~pec1al apparatu~ to control tne motor w1nd1ng temperatures. rhe compresso~s to be test~d were R-~2 two cylln~er ln-llne sem1-hermet1o type units, dr1ven bY an overhung ~-~ ~.w ~JHfJ. ~"~liteE! pt'lase. rou[' pol~ Lnduction mot~or. CONCLUSIONS rh~ two motor-compressors ~ere tested at ~s~c tll~~ F; oondens1ng tempera~ure and several avaporat1ng ternperatur~s ran-gln~ rrom -~o·c (-.;::.:.• F J to 10"C (50" F). The mo~t ~ign1t1cant performance data ot the capac•~•es. duly adj~sted according to thQ rel@vant suct1on sup@rheated vapor and the liqu1d subcoollng temperatures, ate the tel lo~•ngs: Evap. Model Temp.,•C> :;:tanda.rd l.O Prototype 10 Standard 0 Prot~ type 0 .:;tanda.td -10 fit ot.or.',.'Pe! -1u Standard -30 Prototype -30 -------------~----. S1de ve!nttlation external Ad jus. rerr. Capacity ("C> 9665 10011 6490 Ei"-'4-0 .. sao ~ob 1 1.!>12 1419 coolin~. Motor Input (II) 2858 3015 2736 .::as.:. .:.393 .Z<.t-44 148~· 1403• llindlng~ Temp. <"CJ 34 -,, ~:: g_:: s_ 98 Si• 8.3• A mor@ complet@ coll~ction ot tE!!St dat~s c~n be s~~n at Ti'!.IO l e 1. The scop~ ot the t~sts ~e1ng to asc~rtaln the actual ab1llty ot the prototype to pertorm normally at test conditions. the ObJective ~a~ tully ach1eved. In order to decrease or elim1nat~ th~ presently ~~l5tlng 570 dltrerences betwe@n the prototype motol-comp1essol ~nd the stan~ dard on@, the ch~ra~terist1cs thal shculd bs 1mproved in the pr-ototype &JE!- the tollow11"1gs: ~@cre~sd the wir1dtngs t~mperAtures thru ar, improved h~at ~~ot1al1ge b@tween 9Uctlon r·elr1ger~nt ~nd dielect(lO tlu1d, Reduo~ tr1ct1on lo~$es prese1,t 1n the motor chamber thru a lowe~ Vl5COStty inte~medlate flu1d and an inprovement in the ..rotor shape. No s1gn1ticant ll,Cr@ase in the cost of the machine 1s expected trom th~ above 1mprovements. At the completion ot the tests, ~ith tha meter-compressor still warm, the replacement of the stator was completed in less then haJt an hour, with only~ common mechanic tools s~t tsee Pictute 1l. The results ~f teveal significant motor-comp~essors. the test at transient conditions differences between Standard and did not Frototype However an additional aerie of tests on this subject is scheduled according to the methods described 1n raterences 12) and 13). FUTURE TESTS In addition to the tests mentioned in the preceding section, other tests are scheduled to compare a standard semi-hermetic motor-compres~or unit ot larger capacity to a ptototype of the same chatacteristics. The prototype will have the electric motor on the same shaft as the compressor, immersed in the cooling fluid, rotary seal, and motor chamber opmpletely segregated tram the refrigerant system. ln addition to veritying the comparative behaviour of the two motor-compressors, the objective at the tests will be to probe the possibility or utili~1ng the flu1d cooling the motor as a heat source tor thermal applications. ·n,ls way, in addition to ths advantage ot lower11,g th@ motor temperature~ bettsr thermody-namic characteristics ot the motor~oompressor can be achieved, reduc1ng the amount at cooling errect lost remov1ng the heat generated by the motor (see Figure 3). ACKNOWLEDG~lENT The Authors would like to thank Mr. Giovanni, Paolo and Filippo Dorin and acknowledge their substantial contribution to this wo~k. REFERENCES (1) ~ Douglas A. Seh:r-ani<, Joseph P. Vaccar-o, Russel G. Lewis; "The d8Slgn and analysis of a relief plate to reduc@ cylinder pressure in a reciprocating retr1gerant compressor 571 Lrnde1 sl u 1~~1.ng condl.lrl.ons'1• P.roceedl.l"q:4S or the 19tH:! lntern~tlonal Compressor ~ng1neer1ng ~Ollterence l~UrdueJ. ~-) ~ l'hOtl\85 c!. Be-.::key. 11 I!Ot:!>:!llng: ~]'Jti vt?fl.1"1calion l,jf ~ vapor comple55lOn 1'"1eat t--ump'1• 1-'J."ogress lrt the des1gn i!ill"Jd con~ .s ~. ~- 1,1 c: t 1 ~~ 11 (~ r r e t r 1 b ,= L er. t 1 on s y s t. ~ nl 5 ~ /--' u r ~ u ~ 1 • 1 1.:! t:-1.3 • ~3) - Wang Ju11 GJnd Wu \ezhe11g, "Un the• 01"J~~-:,,rt ope(·atlol·t lJ"J tt"1e J@Clpr~~btl!lg compre550f retrl~er&LlQn syste111 w1th cap1l la-!.)"11. ~tot\JS or CJ-:Cs- rtetr-lger&tlC1'J s;,.~stE>ms Ci.!"td lS>:t.r1gE!ra11t pr-operl~les lfu£due;. l.8bl.:l. Picture 1 572 '· Oi·IF hESSOf<S ll:-~ 11 1 11 ;....:,I,IJJ. ~L: uurtllJ - f·[c,,j, 3l.HJ t..-\...- - Uu::q:.t;;...:.: ~- 1 L. s \ 1~• =.ot ~_.Ff·!J lestt=d Un1t..s: ~t~r~UQ&d :::itani:J. ~ro~otyp~ ~ ~ret. i@st -:.~r.!.d1t1.ons: Londens>ng T. 1:.-J~pu~·atln~ r. _l~st r-ar~mate.r s: 10 Stano. 0 -10 -.3:0 Pcot. Stand. Prot. Stand. Pr.ot. s t~lld. f-cot. ------------------------------~~~-----------------~~15'..!... l::.n t.. lolat.. 1'. u.o 1S.S Leav. lolat. T. 3u.e 31.0 Superh • ...:..omp. r. (' 1- '1. 76.9 L>q. :Oubcoo I. T. 38.3 38.4 lola t-l.!t.y 1/ m1 n. 15.4 13.4 Cond. p. Bar N.R. 16.2 Eva.E!Of:ator Ent. lola t. r. 30.1 28.0 Lea.v. I.! at. T. .;:.::..o 19.4 Suct:.Superr..T. 20 . .1 19.Z \Uat.<J.ty. lnnin. ~1. 0 20.8 Evap. p, Bar N. R. N. R. Eiect.Measur. M.Jcltage I VJ 386 380 Pr•.CurriAJ 11 6.36 6 ... 4 I.:: 5.«3 5.45 13 5.24 5.35 I' ow. input \loll 2859 3015 Pow. Fact. cos. 0.79 0.83 M.li: .. s.cold<OJ .2..dl 2. .. 82. M.f(es.hot ( 0) 2.96 3.45 Wind1n~ r. J .. ·;; Me tO! ~001111~ f' ll-'>0 r. se.o UthE:t Mea. sur. Amb1ent !'. :.::.o.d .:Cl. (.) Ace. Coo I. Cap. 10206 10629 Adj. ("ocl. C"'-P• 9665 10071 -----~----~----• S1de ~~nt1Iatlon Coot1ng Name'r"!claturE!: N.R. Not measured T. Temperatur" I"Cl 17.4 30.7 98.7 36.7 1l.3 N.R. 2l..:: 15.7 20.0 21.0 3.96 385 5. 14 5. 26 5. 11 ::736 0.19 :..81 3.03 .. .;: ::o.s 6930 6490 M.R .. s. M"an Res>stence IOhmsJ 16.8 16.0 30.2 30.4 :39.5 114.0 37.1 36.9 10.9 8.3 N.R. N.R. 2.0.2 .2 ... 3 1 ... 9 16.6 19.3 20.0 20.9 10.3 3.96 2.55 384 383 5. 18 4,73 5.oa 4.73 s. 12 4.6.2 2852 2393 0.83 0.76 :;: . 81" 2.75 3.60 3. 10 9~ s.:: N, R. 20.6 2\l.>l 6646 4S:.o 6~40 "600 Cooi.Cap.= Cool>ng Capacity IThermal lolattsJ Tai:Jle 1 573 14.2 31.9 111.9 36. 1 6.3 16.:. 19.4 12.0 19.6 10.0 .2.55 392 4,57 ~.75 4.36 24"l4 o.so ::.73 3.61 ;;,a 88 . .:; 17 . ..:: 4320 4061 P. ACL. AdJ. 18.S 1 ". 1 4l..:. "'2. 10<>.e 10<>.3 36.4 ..3f.u l.S 1.1 lEL 2 N. R. 18.5 19.(.) 11- I 1.:. . ..: 20.0 .:_(; . ..:.. 3.{ 3.7 0.58 0.65 38"-L 386 3.5S .; . .::8 3.66 3~ ..... 5 3.48 .;. 19 l'-4.d.3tt l~V~· 0.6.:.• 0.0-Q.:IIt -· <5 .:.. =..: .3. lS• 2.51 ... s ·;. 8~ .. b.:.ll' .:;0.2 .:.o.-5 1509 15(,9 1412 lw.l~ Fr~5:5ur-e Ac~ual AdJUSted .. iii Ill E "' <:> " ... <:> 30 .. ; 574 <n ..... ..... SCHEMATIC DIAGRAM OF THE COMPRESSOR r------- ------, 1 I t I I I I T3 t I I I I I I I I 1- - T t I I I I 1 Y I 6l _6i~ CONDENSER~r-6j i t rec 1 1 TUc 1 1 L------<>---... --.1 I I ~ MC I I u T1 r .. I I I I I I lEEcH I c~¢---~-----------~ v w MOTOR COMPRESSOR I I 6Me I I EVAPORATOR L •••• --·-------- -t.. --6:· • FIGURE 2 FllfER I DRYER IIIGHT GLASS FLOW CONTROL IIALIIE TEST SYSTEM P1 • EVAPORATING PRESS P2 • CONDENSIN PRESS P3 • LIQUID REFR PRESS ME • CHILLED l!p fLOW MC • CON DEN& H,O FLOW T1 o;: IIUCTION SUPERHEAT T2 • COMPRESS StiPEftHEAT T3 ,. LIQUID SUI COOLIG TEE • EIIAP WATER IN TEMP TUE a EIIAP WATER OUT TEMP I TEC • COND WATER IN TEMP rue • COND WATER OUT ~MP 111213 • PHASE CURRENT v • MEAN IIOLTAG£ I w • POWER INPUT COS¢ • POWER FACTOR "' ..... "' SUCTION VAPOR FROM SYSTEM LARGE CAPACITY SIDE VIEW MOTOR COOLING FLUID TO REFRIGERANT HEAT EXCHANGER PROTOTYPE FIGURE 3 i I j I I I --------i---------1 i I BACK END VIEW 0 

Semi-Hermetic Motor-Compressor Unit with the Motor Outside of die Refrigeration Circuit

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Semi-Hermetic Motor-Compressor Unit with the Motor Outside of die Refrigeration Circuit

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