6* NLN 108 Ml/2012 Moi quan hp giO a he so trao doi nhiet buong dot 87,7 119,2 W/m^K vai tai Ifi hai 3 000^5 000 kg/h, nhiet dp bufing dot 631 ^ 813°C va tfic dfi gio cSp 0,27 f 0,45 m/s la quan hp tu[.]
6* NLN-108 Ml/2012 - Moi quan hp giO-a he so trao doi nhiet buong dot 87,7 - 119,2 W/m^K vai tai Ifi hai 3.000^5 000 kg/h, nhiet dp bufing dot 631 ^ 813°C va tfic dfi gio cSp 0,27 -f 0,45 m/s la quan hp t u y i n tinh II K i t qua tinh toan phu hap vPi giS tn tai d i l u kiSn van hanh tyang i>ng vfi-i t h i l t k l vS so lieu mot so tac gia da cfing bo Do vSy co the xem IS tin eay vS Sp dung vao thyc t l d y p c ABSTRACT This paper presents research on calculation of heat transfer coefficient in the rice-husk fired Improvement Fluidized Bed Boiler Furnace - IFBBF Calculation results were compered with expenmental data Some main results received are as follows: freeboard heat transfer coefficient is 119.2 W/rr?K, minimum fluidization velocity is 0.2 m/s and fluidization velocity is 0.45 m/s, fluidized bed temperature is 856 °C and freeboard temperature is 813 °C The relations between heat transfer coefficient and unit load, freeboard temperature and bed velocity are analyzed The linear relations could be accepted for the IFBBF design regarding to heat transfer coefficient range 87 7-r119-2W/m^K unit load 3000^000kg/h, freeboard temperature 631 SI3 °C and bed velocity 0.27^.45m/s TAI LIEU THAM KHAO TAN DUNG NHIET THAI TUT DAN NGUNG MAY DIEU HOA KHONG KHI CONG SUAT NHO DUN NUdC NONG DE TIET KIEM NANG LUONG B U I N G Q C H U N G , DH Bach khoaDfi Quoc gia Tp Ho Chi Wnh Viec sO dung miy dieu hda khong vi miy nwov ndng da tr& nen bien phan l&n cac hp gia dinh o* cic thinh lan cua nudfc ta hien Tuy nhiin cac thiet bj dang dwac sir dung mpt each dpc lip dong thdi tiiu ton mpt luv'ng dien nang hang thing ding ke cac hp gia dinh Bai bio niy dua mpt hwang tich hgp hai he thong may dieu hda khong vi may nied'c ndng noi tren de tiet kiem ning lieg-ng bang each tin dung nhiet thai to- cac dan ngwng miy dieu hda khong di dun nuoc ndng Mgt md hinh thuv nghigm thu hoi nhiet thai tO' dan ngung cua miy dieu hoa [1] P Sathitruangsaka, T Madhiyanonb, S Soponronnarita (2009) Ricehusk co-finng with coal in a short-combustionkhong lo^i hai phan rdri (split type air chamberfluidized-bedcombustor (SFBC), Fuel 88(8), 1394-1402 conditioning) su' dung thiit bj trao doi nhigt dang [2] M Rozainee, S.P, Ngo, A A Salema K.G Tan, M, Anffin, ong xoan da dwo'c hoin Bang vigc dac Z N Zainura (2008) Effect offluidisingvetocity on the combustion cic thong so hoat dpng cua md hinh da chd'ng of rice husk in a bench-scale fluidised bed combuslor for the produclion of amorphous nee husk ash Bioresource Technology minh tinh kha thi cOa mo hinh si> dung thiet bj 99(4), 703-71 trao doi nhiet ong xoan cung nhw vigc thu hoi (3] L Amiesto, A Bahillo, K Veijonen, A Cabanillas and J Otero nhiet thai khong anh hwong den hoat dpng binh (2002) Combustion behaviour of nee husk in a bubbling fluidised bed thwdng cua miy dieu hoa khdng Bbmass and Bioenergy, 23(3), 171-179 [4] Sheng Huang, Shan Jing, Jinfu Wang, Zhanwen Wang, I 016^1 THIEU Yong Jin (2001) Silica while obtained from ncehusk in a fluidized bed Powder Tec/Jno/ogy 117(3), 232-238 5) F Johnson, B A Nhifit thai tCr t h i l t bi ngyng ty cua hp thong lanh [5] Andersson, B Leckner (1987) Heat flow measurements in d y a c xem la nguon nhiet thai cP nhiet dp thap Cfi fluidized bed boilers Proceedings of a!" International Conference nhieu phyang Sn de thu hoi nhipt thai cua hi thong on FBC - Boston, (1), 592-597 [6] W Pnns (1987) Fluidized bed combustion of a single lanh, nhien ph6 b i l n thyfi-ng IS s y dyng nguon carbon particle PhD dissertation University Twente, Enschede nhiet nSy d l dun nfing nyPc phyc vu sinh hoat hoSc (the Netherlands] gia nhiet s a bfi cho eSc qua trinh cong nghipp [1] [7] Chen Guanyi, Fang Mengxiang, Luo Zhongyang, Yu Boi vPi vipc s y dung mSy d i l u hfia khfing Chunjiang, Li Xuantian, Ni Mmgjiang, Cen Kefa (1998) The hi0n nay, chya eP mfit nghiPn cO'u cy t h l v l lupng Study on Combustion Charactenstics of Rice Husk Fired Fluidized Bed Boiler Journal of combustion science and dipn nang tieu thy hSng thSng eSc hp gia dinh technology cP s y dyng mSy dieu hda Tuy nhien neu dya vao [8] T Madhiyanon, P Sathitruangsak and S Soponronnant cSc so lipu thong ki, cong suat difin ti&u thg eho hfi (2010) Combustion charactenstics of nce-husk in a short-combustiont chamber fluidized-bed combustor (SFBC) Applied Themial h i n g dieu hfia cac cfing trinh nhy eao I c , vSn phPng, khach san chiem tir 45% d i n 55% tong Engineering 30(4), 347-353 [9] Prabir Basu (2006) Combustion and Gasification in lyang dien tifeu thu [2] NgoSi mSy nyfi'c nfing Fluidized Beds Taylor & Francis Group, LLC cCing d y a c xem IS mfit nh&ng t h i l t bj tifeu thti [10] Simeon N Oka, EJ Anthony (2004) Fluidized Bed diPn IPn so vPi cSc thiet bi difin gia dung khSe [3] Combustion Marcel Dekker, Inc Newyork - Basel O i n dS co nhieu nghi6n cu-u de giam lypng 111] Guangxi Vue, Hai Zhang, Changsui Zhao, Zhongyang Luo (2009) Proceedings of the 20" International Conference ondipn nang tieu thy cua mSy dieu hfia khfing vS Fluidized Bed Combustion Tsinghua University Press, Beijing and mSy n y p c nfing D l i vPi mSy dieu hfia IS thay doi Sprmger-Verlag Berlin Heidelberg nhiSt dp cSi dSt ban ngSy, ban dem, thay doi lu'u [13] Phgm HoSng Lu'ong, Do V3n ThSng (2006), "Nghien cim 1/^ img dung cdng ngh$ ldp sdi vA Idp sdi tuan hoin & Viet nam",lypng khfing theo phy tai thyc t l [4] hoSc si> dung bam nhipt d l t i l t kiem nSng l y a n g [5] Vi$c su' B^o cSo liln d« d^ An 10/HO-UTCN 2005-2006 OHBKHN dyng ong nhiet dao dong de thu hoi nhipt thai t y thilt Phan bien: PGS I S T r y a n g Duy NghTa NLN MOB-11/2012* bj ngyng tu dang 6ng-vo da d y p c thyc hien bai Ngoe Hung Bui vS cSc cfing s y [6] VPi he thong dieu hPa khfing khi, P Sathiamurthi vS PSS Snnivasan [7] dS k i t luSn tinh kha thi vS twin qua kinh t l cua hp thong thu hfii nhiet thai tO mSy dieu hfia khfing khf trung tam cfing suat 16 tons lanh de cung d p nyPc nfing eho sinh hopt cija 600 sinh viPn mfit ky tCie xS Trong ITnh vyc dan dung, M M Rahman, Chin Wai Meng vS Adrian Ng [8] da nghien eyu h$ thong thu hoi nhipt thai dun nyPc nfing tO mSy d i l u hfia khfing dan dung vPi t h i l t bi trao doi nhipt bSng I n g dfing quSn ben ngoai vo cua binh nyac nfing vS dS k i t luSn r i n g cfi t h l gia nhiet nyPc binh ty 30°C den 75°C vfing giP may d i l u hfia hoat dfing Trong nyPc, Nguyin Dinh Vjnh, HS DSng Trung dS nghiPn eyu thiet k l , che tao vS thy nghifim thilt bi bam nhiet dun nypc nfing s y dung tSe nhan lanh R22 vS dan Ipnh khfing d i l u kipn hSu Viet nam [9], CSc tSc gia da k i t luan thiet h\ bam nhipt dun nyPc nong cfi COP dpt 3,3 den 3,8 d i l u kipn mfii tryPng nha 22 °C vS dp am 60%, tiet kipm dyac 65% d i n 70% nSng lyang tieu thu so vPi binh dun nyPc nong bSng diPn D^ tilt kiPm nSng lyang viec d i l u hPa khfing vS dun nyPc nfing, bSi bSo nSy trinh bSy vipc nghiPn cCru thiet k l c h i tpo mfi hinh thu hoi nhipt thai tCr dSn nfing cua mSy d i l u hfia khfing d l dun nyfie nfing phyc vu sinh hopt eSc hfi gia dinh Mfi hinh su" dyng dSn trao doi nhipt doi lyu ty nhien I n g xoln bSng dong dpt bfin binh nyfi'c nfing nen de che tgo vS cfi giS thSnh re phCi hap vPi dilu kien cfing nghfi vS klnh t l cua nyPc ta hipn II CAC Y^U T ANH HU'DNG D^N VieC THU H | NHieT THAI TLT DAN NGLfNG MAY B\t\J H A KHONG KHi 2.1 Kha nang t h u hdi nhipt thai tLF may d i i u hoa khong Do thj T - S cua sa nguyPn ly mSy d i l u hPa (hinh 1) dypc t h l hipn trPn hinh Quan sSt tr&n thj T - S nhSn thay cfi the thu hoi toSn bp lypng nhipt ngyng ty q^ n l u nhipt dp nype nfing s y dung cfi giS tri nhipt dp thap han nhifit dfi ngyng ty eua hp thing Ipnh giai nhifit bSng nyac 3/7\^y /\ \ \ r / \ / ^ '^ Q/" K 1 S* 1 Sl s Hinh Dd thl T - S N l u toSn bfi lypng nhifit thai o- t h i l t bi ngyng tu d y p c thu hoi, la cfi he so thu hoi nhiet thai ly thuylt d y p c tinh nhy sau: (1) COR, '•(S) VPi mSy d l l u hPa khfing sCi' dung tSe nhan lanh R22, gia tn COP ly thuylt o- cSc nhiet dfi ngyng ty khae d y a c tinh theo cong thyc (1) vS trinh bSy bang Qua bang nhpn t h i y giS tn COP cSng cao nhiet dfi ngyng ty cSng thapHien eSc mSy dieu hfia khfing dang dypc s y dung vpi nhieu lopi tSc nhan lanh khSc nhy dypc trinh bSy cSe bang 1, vS Dya vSo cSc thflng so trpng thSi cua nh&ng d i l m d§c bipt tr6n chu trinh vd\ cSc loai tSc nhSn lanh nhy R22, R410A, R407C, R134a nh^n thay nhipt dp sau mSy nPn biln khoang 78°C d i n 82°C d nhiPt dfi ngung ty 50°C VPi tSc nhSn lanh R22 nhi$t dfi ngyng tu thay doi khoang 40°C d i n 50°C tht nhifit dfi sau mSy n6n thay doi khoang 68°C d i n 82°C Tuy nhien nhiet dfi cua tSc nhan lanh sau mSy n6n (dilm trfin thi T-S) cfi t h l cao han [10] mSy lanh hoat dong vdi chu trinh thyc t l cfi eSc ton that ap suat eua thilt bj ngyng tu, bay hai cCing nhy quS trinh nPn khfing doan nhipt vS khfing thuan nghjch mSy n6n nhy dypc t h l hipn hinh Nhy vpy he so thu hoi nhiet thai thye t l cP t h l dypc tinh tren ca so* lypng nhifit nyac nfing binh nhSn d y a c vS dien nSng tieu thy cua mSy dieu hPa cu the theo cfing thCfc nhy sau; co/;,=f:S^l (2) S^ng" Thdng so cua cic diem tr^ng thii trin thi T- S sir dyng tSc nhSn lanh R22 R22 Hinh Scr d& nguy§n ly cua mAy dieu hda khdng trangthii trc] 1' 10 81.64 2' 50 50 i Plbarl i [kjykg] 983 ' 704 28 983 7U62 19.395 T-lJ.SOaS , 19.395 r 716 78 s [kJ/kG K] 7479 77d3 1.7743 19 395 T 562.75 15832 2065 4,983 2297 562,75 * NLN-108'11/2012 Sang 2, Nhiet sau may nen, ap suit ngung tu va hi so COP nhiet thai cua R22 (9/ cac gia tn nhiet dq ngung tg khac J'C] rci spsjatnevnEtw Ibir) I COP 40 81.64 74.82 67 92 19.395 17.265 15 315 5,1372S 75633 6,0553: 2.2 Tac nhan lanh va cac thong s o hoat dong Bang 3: Nhi^t dg sau may nen cua mpt sd tac nhan l^nh thdng dicing a nhi$t dp ngung tu 5(fC Tacnhanlanh Mii^td^c u may ntn o-nbi^f d$ ngu-ng ly SO'C H22 81.G4 63 51 79 73 R407C R410A III MO HiNH THU'C NGHIEM SCF DUNG DAN TRAO D O I NHIET N G X O A N O O I LUOJ TU" NHIEN 3.1 T h i l t k l mo hinh Mo hinh bao gom phfing a gia dinh co dien tich 12 m^ PhPng d y a c trang b| bfi may d i l u hoa nhiet dp loai phan rpi s y dung tSe nhan lanh R22 Mpt van by-pass d y p c trang bj de cfi the hoat dfing mfi hinh 6' c h i dfi cfi thu hoi nhiet thai vS khfing cfi thu hoi nhiet thai (hinh 4) Theo [2] tinh d y p c cfing s u i t cua mSy d i l u hfia la 9000 BTU/h Gia s y phfing cfi ngyPi a, mfii ngypi s y dung 30 lit n y a c nfing cfi nhiet dfi 45''C mfit ngSy, xSc dmh l y p n g nyPe nPng can cung d p IS 90 lit Thiing nypc nfing co dung tich 90 lit d y p c lam bSng inox 304 chya dan trao doi nhl^t ong x o l n b i n g I n g dong cfi d y a n g kinh ngoSi 10 mm, De giam ton thSt nhiet cua nyfi-c nfing mfii trypng, binh d y a c boc eSch nhiet bSng vat lieu thermaflex cfi b l dSy 20 mm NgoSi de tang hifiu qua trao doi nhiet, thilt bj trao doi nhi^t ong xoan cfi ngfi vSo cua tSc nhan lanh o' phia tren vS ngo a phia dyPi nhy d y a c minh hpa hinh Nhifit dfi cua nyPc binh d y a c b i n g 03 cam biln gSn a vj tri b6n dyPi (each dSy binh 100 mm), ben tren (cSch dfnh binh 100 mm) vS gi&a binh nhy hinh ve NgoSi eae thong sP nhiet dfi mfii tryfi'ng, nhiet tae nhSn lanh vSo va bp trao doi nhifit, ap s u i t ngyng ty va ap suat bay hai, cyfi'ng dp dong dien vS di#n ap cung d y a c dfing thPi quS trinh thi nghiem 3.2 Tinh dien tich hi mat t r u y i n nhiet cua t h i l t bj thu hfii nhiet thai dang fing xoSn mo hinh QuS trinh truyin nhi^t tii' tSc nhan lanh thiet bj trao doi nhi$t den nyPc nong bon tich try bao gom phan truyin nhipt pha giya nyPc vS hai tSc nhSn lanh ti> trang thSi qua nhifit d i n hai bSo hda khfi va quS trinh ngyng ty eua hai bao hfia khfi d i n trang thSi long bSo hfia Hfi s6 tmyIn nhiPt tCr hai tSc nhSn lanh quS nhipt a d i l m d i n trang thSi hai bao hpa o" d i l m 2' dypc tinh theo quS trinh t m y I n nhipt pha gii>a dfing hai fing vS nyfi'c dfii lyu t y nhiPn bPn ngoSi fing nhu sau a = wj d Trong dfi; A^K =0,021 R e " ' P r " " ' (4) Hp sfi t r u y i n nhi#t ngyng cua hai tac nhSn lanh bao hoa a diem 2' d i n trang thSi long bao hoa a d i l m d y p c tinh theo quS trinh ngyng hai trong ong va nyPc doi lyu t y nhi§n bfin ngoSitng Theo [11] hfi so tea nhi0t ngyng tu cua hai t^c nhSn lanh ong dyac tinh theo cfing thue nhu sau ^o,.sf^^|^( ^c.(, -O (5) Vai mSy d i l u hoa khong eP eong suSt 9000 Btu/h, thay cac gia tri so eua tSc nhSn lanh R22 bfl trao doi nhigt dfii lyu t y nhifin dang fing xoln b i n g dPng co dyPng kinh ngoSi 10 mm dSt ben binh n y a c nong cfi nhi^t trung binh 40*'C vao cSe eflng thyc (3), (4) vS (5) ta eP d y p c k i t qua tong chieu dai I n g truyen nhi^t IS 10,7 m IV K^T QUA VA THAO LUAN Cac so lieu thye nghipm d y p c ghi nhan dong thd'i theo thpi gian tai nhieu thPi diem khSe de the hien eho hoat donp eiia mSy dilu hfia thye t l vS d y p c the hien bSng eSc thj nhy hinh S y thay doi nhiet dfi eua nyPe nfing binh theo thai gian d y a c t h l hi6n trPn hinh Nhiet nyfi'c thay doi t y 32°C d i n 53''C thai gian gia 50 phut Luc d i u nhi^t dfi cua nyPe tang nhanh nyPe binh co nhiet dp thap nen toan bfi lypng nhiet l y p n g thai cua mSy dieu hfia dyac nu'Pc hap thy va he t h i n g cP the xem nhy d y p c giai nhi6t bSng nyac Khi nhiet dp nyPc tSng, nhi^t dp ngung tu vS ap suat ngyng tu se tSng theo Khi Sp suit ngyng tu tang d i n giS tri bSng giS trj cua hp thong giai nhi&t b i n g khong thl nhi0t lypng nyfi'c binh nhan d y p c b i t dau giam ISm cho nhifit dp cua nyac binh tang chSm lai vS nhi#t dfl nufi'c cao han nhipt dp ngyng ty thl nyPc chT cfin nhan d y a c phSn nhiet l y p n g quS nhipt cua tSe nhan lanh (ty diem d i n d i l m 2' tren thi T - S), gia tri nhiet dfi Ifi-n nhat cua nyfi'c binh phu thufic vSo nhifit dp eua tSe nhSn lanh sau mSy nen (diem tren thl T - S) vS loai t h i l t bi trao doi nhi$t s y dung Ngocii d y a vSo hinh nhan thay can mpt thai gian hoat dpng eua mSy dieu hfia khoang 40 phut d l gia nhi^t cho nyPc t y nhifit dp moi tryPng 32°C den nhiet dg cfi the s y dung cho sinh hopt IS 45°C Hinh trinh bSy s y thay doi nhi^t dp cua tac nhan lanh dl vSo va khoi bO trao doi nhipt tyang yng vd\ nhiet dp eua nyPe nPng binh tieh tri> Khi h§ thong^ b i t dau hopt dpng, nyPc binh co nhi^t dfl thap nen toSn bfi nhipt lypng thai a t h i l t bi NLN'108-11/2012'9 Hinh D6 thi T-S cua chu trinh lanh thyc Hinh Su thay doi nhi^t cua tac nhan l$nh di vao vA khoi bo trao doi nhi$t ngyng tu d i u d y a c nyPe hSp thy Khi nhifit nyPc binh tich try tang dSn, nhipt dp cua tSc nhSn lanh dl eung tang theo, cfi nghTa IE ' "ong nhiet thu hfii giam Hinh Sodd nguyen ly cua md hinh thuc nghiem Hinh trinh bSy s y thay doi eua Sp suat ngyng tu theo nhifit dfi cua nyfi'c nfing binh tich trij Khi nhiet dp nyPc binh tich try tSng thi Sp s u i t ngyng ty tang Tuy nhien nhiet dfi nyPc nfing binh lan han 45''C thl Sp suat khfing tSng vS giU I n dmh a giS trj gan b i n g vo'i gia tri ap s u i t cOa he thfing khfing thu hoi nhiet thai D i l u IS bfi trao doi nhipt I n g x o l n d y p c ISp noi tiep vd'i dSn ngyng giai nhipt b i n g khfing cua mSy d i l u hfia Do dfi nyfi'c binh tSng thi ap suat ngyng ty tang theo, ap s u i t nSy tSng d i n giS tn Sp s u i t cua he thong giai nhiet b i n g khfing thi tScnhSn lanh khfing ngyng ty t h i l t bi thu hoi mS b i t dSu ngyng ty dSn ngyng giai nhifit b i n g khfing cua mSy dieu hfia Ap s u i t ngyng ty I n dmh toSn bfi nhiet lyang ngyng ty ( d i l m 2' d i n tren thj TS) d y a c thai o' dSn ngyng cua may d i l u hfia Do Sp s u i t ngyng tu cua t h i l t bi ngyng tu giai nhipt bSng khfing phu thufic nhifit dp mfii tryfi'ng va phu tai phong, nen cSc thfing so nSy thay doi ISm cho Sp s u i t ngyng tu dao dflng the hipn bSng eSc giS tri Sp s u i t giam vS tSng lai nhy d y p c t h l hien tren hinh Nhifl a5 tnjng binh cua nirtc troni) Binh llcft Irir fC\ Hinh Sy thay d6i nhi^t dd cia nuac ndng binh tich tru theo thdi gian Hinh Sy thay doi ip suit ngung tii theo nhiet dp cOa nu&c ndng tmng binh tich Iru 10* NLN-108'11/2012 Khi nhiet dp nyPe nong binh tang d i n 45 °C thi chi cPn thu hoi d y p c khoang 25% vS l y p n g nhifit thu hfli se giam d i n nhiPt dfi nyfi'c binh cSng tSng Dieu nSy cfi nghTa la hP thong ehi hoat dfing hipu qua nhiet dfi n y p c nPng can s y dung cfi giS tri nho han 40*'C V K^T LUAN Hinh Sy thay doi cudng dd ddng di$n cua md hinh trud'ng hop cd thu hdi nhiet thai va khong thu hoi nhiet thai Hinh trinh bSy s y thay doi c y p n g dp dfing dien eua mfi hinh tryang hap cfi thu hfli nhiet thai vS khflng thu hfli nhiet thai Khi hfi thflng hoat dflng oc h i dfi khfing thu hoi nhiet thai (van by-pass tren mfl hinh ma), cyfi'ng dp dfing dien on dinh quanh giS tn dinh mi>c vS chi dao dflng theo nhiet dp mfli tryang, dien ap vS phy tai Khi he thong hoat dflng a che dfl thu hoi nhiet thai, cyPng dp dfing dien co gia tn nho han giS trj djnh miFC nhiet dO nyPc nfing binh thu hoi cfin thSp Khi nhiet dfi nyPc tang d i n thi cyPng dfl dfing dien tang, nhyng v i n khfing v y a t quS giS tn hoat dflng cua he thfing traang hap khfing thu hoi nhiet thai Dieu nSy cfi nghTa vPi he thing cfi thu hfli nhiet thai, cfi the t i l t kiem mot phan difin nSng nhiet dfi n y p c binh tich trij cfi giS tri nho han 40°C ^ Hinh 10 trinh b S y s y thay doi cua he sfi COP thu hoi nhiet thai thyc t l theo nhiet dfl eua nyPc nong binh tich _tr& Qua hinh 10 nhSn thay hp sfi COP thyc t l b i t dSu giam nhiet dp n y a c cao han 40°C Khi nhiet dfi n y p c nfing cSng eao thi gia trj COP thyc t l cSng giam So sSnh giS tri eua hfi so COP thyc t l vo'i giS tri eua he so COP ly thuylt bang nhan thay nhipt nyPc nflng binh cfi g^ia tn nho han 40°C thi l y p n g nhiet thai thac t l thu hoi d y a c khodng 50% d i n 60% so vPi ly thuylt Lypng nhifit thai co the thu hfii t y mSy dilu hfia khfing phu thupc rat nhieu y l u to ve dieu ki^n hoat dflng nhy nhiet dfl ngyng ty, nhiet tSc nhSn lanh sau mSy nen, nhiet dfl vS l y p n g nyPc n^ng si> dung Ngoai cfi nhyng yeu t l lien quan den t h i l t bi n h y tSc nhSn lanh, loai thiet b| trao doi nhiet He so COP thu hoi nhiet thai thyc t l phu thufic vao nhipt dfi n y a c nong binh thu hoi, nhiet n y p e nfing s i i dyng cSng cao thi giS tri COP cSng giam va he thfing chi hoat dfing hipu qua nhiet dp n y p c nong c i n s y dung co giS tn nho han 40°C Viee tan dung nhiet thai khfing anh hyang den hoat dfing binh t h y p n g cua mSy dieu hPa khfing khf NgoSi he thong co thu hoi se tilt kiem mpt phan dien nang tieu thu nhifit nyPc binh tich tru' nho han 40°C TAI LIEU THAM KHAO [1] Robert Goldstick, Albert Thumann, GEM, PE - The Waste Heat Recovery Handbook - The Fairmont press, INC [2] TS Le Chi Hiep, K? thuat difeu hoa khfing khi, NXB Khoa hoc v a K y thuat, 1998 [3] S6 tay huwig d i n thong tin san phlim may nu'dc n6ng nSng Impng m^t titi Tmng tam tfit ki^m nang luwng Tp HCM, 2009 143 NguySn T h l Bao va Lam Thanh Hung - Scf 06 Mo Phong H^ Thong Lam Lanh Bay H p i cd Sir Dung Ch^t Hut Am Lithium Chloride Trong 0\hu Hoa Khong Khi NhSm Ti61 Kigm Nang lu'p'ng - Tgp Chi Khoa H