Tgp Chi Khoa Hpc Gido Due Ky Thudt (32/2015) Truing Bgi Hpc SuPhgm Ky Thugt TR HS ChiMinh NGHIEN c u t ! THIET KE VA LAP DAT HE THONG THI NGHIEM CHO THIET BI NGUTNG TU KENH MICRO A STUDY ON DESIGN AND EXPERIMENTAL SETUP FOR MICROCHANNEL CONDENSERS Doan Minh Hiing, Nguyin IVong Hi^u, Dang Th^nh Trung Trudng Dgi hoc Suphgm Ky thudt TP Ho Chi Minh Ngay tda soan nh$n bai 02/02/2015, phan bi$n danh gia 31/3/2015, chap nhan dang 8/4/2015 TOM TAT Bai bdo ndy trinh bay idt qud xdy dung he thong thi nghiem phiic v« cho cdc nghien ciiu vi thiit bi ngung tu kenh micro Ngodi bdi bdo trinh bay ket qud nghien cuu thuc nghiem tren hai mdu thiit bi ngung tu kenh micro vdi liru chdt duac su dung Id nudc cho trudng hap kenh micro dgt thdng dung vd ndm ngang Cdc kit qud thirc nghiem tir he thong ndy ddng tin cgy, nen he thing thi nghiem ndy co the duac diing de thirc hien cdc thi nghiem truyen nhiet micro, Tir khoa.- Thiit ki, Idp ddt, kenh micro, thiet bi ngimg tu, nhiet ABSTRACT The developing an experimental setup for microchannel condensers was done in this study In addition, the paper also showed experimental results on two microchannel condensers with water as the working fluid for the cases of vertical and horizontal microchannels These experimental results obtained from this system are reliable, so this system can be used for experiments of microchannel heat transfer etc Keywords; Design, experimental setup, microchannel, condenser, temperature I G i d l THIEU Voi su phat tri6n manh me cua khoa hoc ky thuat, nhidu san phjm cong nghe eao da doi, dae biet la eae thiit bi, linh kien dien hi CO kich thudc nho din cB nanomet Cac thiit bi yeu ciu co kich thuoe nho nhung voi mat dg dong nhiet Ion Do nhu ciu nghien ciru cac thiit bi trao dii nhiet (TBTDN) cang duge quan tam d i giam kich thuoe tuong ung nhung cong suit phai Ion moi co thi dap ung nhu ciu cip thiit vi ITnh vuc cong nghe cao Vi vay, truyen nhiet miero/nano la mgt nhiing ITnh vue moi va duge nhiiu nha khoa hge quan tam nhimg nam gin day Lien quan den cac nghien ciru vi thiit lap cac thiit hi thi nghiem, Fiorot eiing cpng su [1] da nghien ciiu thiit lap mot he thing luong nhirng hien tugng song lan eho dong ehay ting kenh ho Manimuthu cung cgng su [2] da nghien cira thiit lap mgt he thing thi nghiem don gian di chit dien moi va tir tinh Gflnther ciing cpng su [3] da thiit lap he th6ng kiim tta sir ro ri cua dong ehay mgt he th6ng phan ph6i nuoc Vevelstad ciing cong su [4] da nghien ciiu anh huong ciia he th6ng thi nghiem len su suy giam amin Salas-Cabrera eimg cgng su [5] da lip dat mgt he thing thi nghiem cho giang day cac vin de dgng luc hge CJ Viet Nam, tren cae cong b i khoa hge chinh thing, he thing thi nghiem cho cac thiet bi ngung tu kenh micro chua dugc noi nao nghien cuu va su dung, Tir nhirng nghien ciiu lien quan tren, cdc tdc gid chua nghien cuu hay cong bo chi tiet ve mQt he thong thi nghiem cho thiet bi ngimg ^V kenh micro Do vay, viec nghien ciiu thiet ki va chi tao mgt he thing thi nghiem eho cac thiit bi ngung tu kenh micro d^t cac yeu cau ky thuat va dap img eae nhu cau tren la mgt thach thiic va cip bach hien Nghien cuu se phue vu cho phong thi nghiem Truyin nhiet Tgp Chi Khoa Hge Gido Due Ky Thugt (32/2015) Trudng Dgi Hpc Su Phgm Ky Thugt TPHd ChiMinh Micro Phdng thi nghipm tai Xudng Nhiet - Dien Ignh dugc trang bj rapt sd thiet bi do, thiet bi thi nghiem cd thi dap ling mpt sd nhu cau nghien ciiu khoa hpc ITnh vuc tren cho can bd giang day, hpc vien cao hpc va cac nha khoa hpc va ngoai Tnrdng II THIET NGHIEM KE HE THONG sdi nhd dien trd, hoi khdi Id hai mini dugc dua vao binh on ap nham dn djnh ap sudt de cdp vao thilt bi ngung tu kenh micro Tgi day hoi ndng nha nhiet cho nudc giai nhiet, thuc hien qua trinh ngung tu ddng ap trd long hoan toan trudc rdi khdi thilt bi ngung tu kenh micro THI L He th6ng thi nghif m a Nguyen ly iam viec cua TBTDN Hai dugc cap tir Id hoi mini vao bd trao ddi nhiet (Hinh 1) nha nhiet cho nudc giai nhiet ngung Igi Idng hoan toan trudc khdi bp trao ddi nhiet Nudc giai nhiet dugc cap bdi bom mini dieu khien dugc luu lugng S4 SI Nuoc vao , Hoi vao Hinh 2: Sa h? thong thi nghiem cac BTDN kenh micro [6-8] Bp trao ddi nhi6t (thilt bi ngung tu k8nh micro); Lo hoi mini; Bom mini; Binh chiia nudc; Van xa nudc ngung; Van dieu chinh; Binh tach long; Bg thu dii lieu; Mdy vi tinh Hinh 1: So nguyen ly ciia TBTDN micro [6] Cam biin chenh ap dugc sir dung de xac dinh chenh ap cua thiet bi hoi vao thiet bi va nudc ngung khdi thiet hi Bdn cam bien nhiet dp loai T cd kich thudc dau cam biin la 200pm de nhiet dp hoi va nudc tir phia vao va cua bd trao ddi nhiet, ngoai cdn mdt sd cam bien khac dugc bd tri de nhi?t dp ciia be mat ben ngoai thilt bj va mdi trudng xung quanh b Thilt ke he thdng thi nghifm He thdng thi nghiem dugc thilt kl nhu hinh 2, d day nudc tir binh chiia dugc bom micro bam vao Id hoi mini, rdi dugc dun Nudc giai nhiet dugc bom tir binh chiia day vao thiet bi trao ddi nhiet de nhgn nhiet tir hoi ndng, nhiet dp nudc tang len sau dd dugc day vao binh chiia de lam mat Trong sudt qua trinh nay, tat ca cac thdng sd ve nhiet dp va dp chenh ap dugc bd luu trft dir lieu ghi nhan va luu tru vao may tinh Cac thilt bi a Mini Boiler - Model: EMB-S-9 - Cdng sudt: 9kW - Dien ap: 240V - Kich thudc: 10 1/2"W x 5/8"D x 25"H - Nhiet dp: 90''F 160"? - Xudt xir: USA Tgp Chi Khoa Hpc Gido Due Ky Thugt (32/2015) Trudng Dgi Hpc Su Phgm Ky Thugt TP Hd ChiMinh Hmh 5: Bg thu nhan va luu tru dii lieu Hinh 3: Lo hoi mini Ld hoi mini cd cdng suat dien trd tdi da dat 9kW (hinh 3), he thdng lam viec ta hoan toan cd the dieu chinh dugc cdng suat hoi cho phii hgp vdi cdng suat cua thiet bi can nghien cim b Can dien tu- Model: TE214S Trong nhieu trudng hgp neu eac nghien cihi can sd lugng kenh nhieu hon, van cd the ghep noi them nhieu bd Analog Input kem theo va nhu vgy sd lugng kenh de lap cam bien ap suat va nhiet khdng cdn bj ban che Su hien thi kit qua dugc the hien d hinh d Cdm biin chenh l^ch dp suat - Dien ap dau ra: to V - Dp chenh ap: 0-1 bar - Dp chinh xac: ±0,025% FS - Nhiet hogt ddng: -20 8a°C - Khdi lugng ddi da: 20Ig - D p phan giai: 0,0001g -Saisd:±0,0015g - Thdi gian ghi nhan dil lieu: 03 giay Hinh 6: Cam bien chenh 16ch ap suat Hinh 4: Can dien tu Can dien tii cd sai sd rat be va dp phan giai cao rat phu hop de xae dinh khdi lugng hoge luu lugng khdi lugng cua luu chat (Hinh 4) Trudc ta phai reset thiet bi de dam bao rang tren man hinh thiet hi hien thi 0,0000 gc Bp thu nhgn vd luu trir dir lieu (MX 100) - Sd kenh: 20 kenh {nhiet dp va ap suat) - Tdc dp ghi nhan du lieu: 0,1 giay Cam bien cd dp chinh xac cao sii dung rdt phii hgp d l xac djnh dp chenh ap cua luu chat giua dau vao va dau cua thiet bi trao ddi nhiet kenh raicro Tin hieu dau 0-5V dugc lip vao bd thu nhan dii lieu MX 100 va luu trii dii lieu vao raay tinh e Cam bien nhiet dp Cam biin dugc su dung la logi T cd kich thudc rdt nhd vdi dudng kinh day va ddu cam biin khoang 200 pm Vdi kich thudc nay, cac cam biin dl dang bo tri tgi cac dau vao va dau cua thilt bi frao ddi nhiet ma khdng gSy anh hudng Idn din ddng ehay cua luu chat Mot s6 thilt bi khac Thilt bi an toan diing he thdng dilu khiin cua id hoi mini gdm: _ , - Van an toan tu dpng dugc lap cd dinh tren Tgp Chi Khoa Hpc Gido Due Ky Thugt (32/2015) Trudng Dgi Hge Su Pligm Ky Thugt TP Ho ChiMinh dudng hoi ra: van an toan lam viec ap suat hoi qua cao ma ro le ap suat chua hoge khdng tac ddng - Ro le ap suat dugc su dung de bao ve tir dpng eho Id hai: niu ap suat cua hoi cao han gia trj cai dgt thi ro le tac ddng ngat ngudn dien cdp cho dien trd gia nhiet cua Id hoi - R a le nhiet dp dugc sii dung de dam bao an toan trudng hgp thieu nudc cap vao Id hoi, liic phan dien trd se gia nhiet cho phan hoi bao hda lam dp qua nhiet ciia hoi tang: niu nhiet dp hoi qua nhiet han gia tri cai dat thi le nhiet ciing tac dpng lam ngat ngudn dien cap cho dien trd gia nhiet cua Id hoi Lugng hoi va cac thdng sd vat ly (nhiet vd dp sudt) dugc dieu khien dn djnh de cap vao bp trao ddi nhiet nhd van giam ap (xd moi trudng) dugc dieu chinh bang tay Muc nudc 16 hai dugc tri nhd bom mini cap nudc, bom dugc dieu chinh cap nudc diing bang lugng nudc 16 hai da hoa hoi Nghi§n cmi thuc nghiem qua trinh ngung ty cua thiet bj trao ddi nhiet kenh Bdng 1: Mo ta hinh hge ciia hai thiet bi Uac doi nhiet dimg thi nghiem [6] Kich thuoe cac kenh Kich thudc micro (jim) STT substrate (mm) Phia hoi Phia nuac L W T W D_ W^ D, Tl 46 26,5 1,2 500 300 500 300 T2 46 26,5 500 300 500 180 Hinh 8: Mo ta kich thudc cua cac mau thi nghiem [6-8] Trong nghien ciiu tac gia da nghien Cliu sir anh hudng ciia chieu ddng ehay len dac tinh truyin nhiet ciia cac bd trao ddi nhiet kenh micro cho thiet bi ngung tu mau Tl va T2 (hinh hdng I) Kit qua dugc thi hien tren bang Bang 2: Ket qua cdng sv^t thiet bi Cong suat nhiet (W) Hinh 7: He thdng thi nghiem da hoan thien va dua vao van hanh thii nghiem III KET QUA THirC HIEN He thdng thi nghiem da dugc dua vao su dung, cac ket qua thi nghiem cung da dugc cdng bd tren mdt sd tap chi va hdi nghi khoa hoc cd phan bien (nhu Hinh 7) Sau day la mot sd kit qua minh chimg tir ling dung ciia he thdng g/s m g/s Tl 0,123 T2 0,0481 TBTDN Nguge chieu Ciing chieu 3,159 194,63 184,32 3,159 111,52 107,197 la luu lugng hoi ngung (g/s) : la luu lugng nudc giai nhiet (g/s) Tgp Chi Khoa Hpc Gido Due Ky Thuat (32/2015) Trudng Dm Hge Su Phgm Ky Thugt TP HS Chi Minh Trong qua trinh thuc nghiem ca hai md hinh cd cimg dieu kien lam viec: hoi cd nhiet dp 101°C va nudc lam mat cd nhiet dp va luu lugng khdi lugng tuong ling la 32°C va 3,159 g/s Ca hai md hinh dugc thi nghiem cimg vi tri nam ngang No dugc khao sat cho thay rang lugng nhiet thu dugc tir so dd nguge chieu ludn cao hon gia tri thu dugc tir so dd cung chieu: Gia tri thu dugc tir so dd nguge chilu gdp 1,04 din 1,05 idn so vdi gia tri thu dugc tir so dd cung chieu Ket qua ciing ddng thuan vdi ket qua thu dugc truyen nhiet mdt pha (single phase); nhien, nd chi rdng su anh hudng ciia chieu dong ehay d6ng hai pha khdng nhieu bang anh hudng ddng mdt pha [6] Trong nghien cim tac gia da su dung hai md hinh diimg va nam ngang de danh gia hieu qua trao ddi nhiet cua hai thiet bi tren (bang 1) Kit qua thu dugc tu nghien ciiu the hien rang hoi ngung tu qua thiet hi giam giam dudng kinh quy udc cua kenh, nhu the hien d hinh 10 Vdi bd trao ddi nhiet cd dudng kinh quy udc cua kenh 375 pm, san lugng hoi qua thiet bi dugc ngung tu d 0,123 g/s; vdi bp trao ddi nhiet cd dudng kinh quy udc cua kenh 265 pm, san lugng hoi qua thiet bi dugc ngung tu d 0,0481 g/s • Water lein)aaiure diflaHKC Hydraulic diameter, mm Inlet water temperature, °C Hinh 9: Anh huong nhiet dau vao ciia nudc lam mat BTDN Tl [6] Ngoai ra, tac gia cdn danh gia su anh cua nhiet dp nudc giai nhiet den nhiet dp dau cua ca phia hoi va nudc cho bd trao ddi nhiet T l Ket qua cho thay rang nhiet dp nudc dau vao lam mat tang, nhiet dp dau cua nudc lam mat tang; nhien, dp chenh nhiet dp giua dau vao va dau tang cham Nhu mdt ket qua, dp chenh nhiet dp cua phia hoi giam hay nhiet dp dau phia hoi tang nhanh Dieu cd y nghia ring hieu qua truyen nhi8t ngung tu cac thilt bi ngung tu kenh micro giam tang nhiet dp dau vao cua nudc giai nhiet, nhu thi hien d hinh Nghien cmi anh hudng kich thirdc kenh den qua trinh ngung tu cua bg trao doi nhiet kenh micro Hinh 10: Moi quan he giiia hoi ngung tu va dudng kinh quy udc cua kenh micro [7] Ddng thdi vdi ket qua hinh 11 the hien mdt quy luat thiet bi dd la luu lupng khdi lugng cua nudc lam mat giam thi hoi ngung ty giam nhien giam khdng dang ke Them vao dd, vdi nhirng sd lieu thuc hien tren bp trao ddi nhiet T l , kit qua thuc nghiem thi hien rdng mdt lugng nhiet 269,21W thu dugc d trgng thai hoi cd nhiet dp va san lugng hoi ddu vao tuong ling la 101°C va 0,1299g/s va cho nudc giai nhiet cd nhiet dp va luu lugng khdi lugng tuong ling la 33°C va 3,1136g/s So sanh giiia kit qua thu dugc ttong nghien Cliu vdi cac kit qua thu dugc [7], nd da thi hien ring lugng nhiet qua trinh ngung tu cao hon so vdi nhiet lugng qua trinh ttiiyin nhiet mdt phase diing ciing mdt bp trao ddi nhiet TL Tgp Chi Khoa Hpc Gido Due Ky Thugt (32/2015) Tnrdng Dgi Hge Su Phgm Ky Thugt TP Hd Chi Minh Mass fbw rale of water, g/s Hinh 11: Mdi quan he giira hoi ngung tu va luu lugng khoi lugng cua nudc [7] Bang cho thay rang lugng nhiet thu dugc tii vi tri nam ngang khdng khac gi so vdi cac gia tri thu dugc ciia bd trao ddi nhiet dat d vi tri thang diing Bdng 3: Cac gia tri thuc nghiem d vi tri diing va nam ngang [7] Vitri Cong suit nhiet Q (W) MluTl M§uT2 Dung 187,3 107,4 Nam ngang 187,6 107,2 Cac ket qua bang cho bd trao ddi nhiet T2 dat dugc cac gia trj tren d dieu kien hoi cd nhiet dp va luu lugng vao tuong ling la 101 °C va 0,0481 g/s va nudc giai nhiet cd nhiet dp va luu lugng vao tuong img la 31,9°C va 3,1904g/s Tu cac gia tri bang 4, nd dugc the hien rang lugng nhiet thu dugc tir bd trao ddi nhiet T1 cao hon gia tri thu dugc tir bp h-ao ddi nhiet T2 [2] Lugng nhiet 187,6 W thu dugc tii T l d dieu kien hoi cd nhiet dp va luu lugng vao tuong ling la 101°C va 0,0758g/s va nudc giai nhiet cd nhiet dp va luu lugng vao tuong img la 32°C va 3,2004g/s Tir nhiing ket qua thi nghiem tren, he thdng thi nghiem dang tin cay va hoan toan cd kha nang dap ling cho cac dinh hudng nghien Cliu khac tuong lai IV KET LUAN He thdng thi nghiem da dugc thiet ke va lap dgt cdng, san sang phue vu cho cac nhu cdu thi nghiem tuong tu nhu nhfing ket qua da nghien ciiu d tren Cac ket qua thye nghiem tir h& thdng dang tin cay, nen he thdng thi nghiem cd thi dugc dimg d l thuc hien cac thi nghiem truyen nhiet micro, Ngoai ra, he thdng cdn cd the phue vu cho su danh gia hieu qua cac thiet bi trao ddi nhiet khac cho ca trudng hpp luu chat khdng chuyen pha hoae chuyen pha tir trang thai hai ngung tu trang thai long va nguge Igi TAI LIEU THAM KHAO [1] G.H Fiorot, G.F Maciel, E.F Cunha, and C Kitano, Experimental setup for measuring roll waves on laminar open channelfiows, Flow Measurement and Instrumentation, Vol 41, 2015, pp 149-157 [2] P Manimuthu, N Praveen Shanker, K Saravana Kumar, and C Venkateswaran, A simple experimental setup for magneto-dielectric measurements, Physica B: Condensed Matter, Vol 448, 2014, pp 354-355 [3] M Gunther, D Steffelbauer, M Neumayer, and D Fuchs-Hanusch, Experimental Setup to Examine Leakage Outflow in a Sealed Water Distribution Network, Procedia Engineering, VoL 89, 2014, pp 311-317 [4] Solrun Johanne Vevelstad, Andreas Grimstvedt, Hanna Knuutila, Eirik Falck da Silva, and Hallvard F Svendsen, Influence of experimental setup on amine degradation, International Journal of Greenhouse Gas Control, Vol 28, 2014,pp 156-167 Tgp Chi Khoa Hpc Gido Due Ky Thugt (32/2015) b Truong Dgi Hoc Su Phgm Ky Thugt TR Hd ChiMinh [5] Salas-Cabrera, R.; Mayo-Maidonado, J.C ; Gonzalez-Hernandez, J.G ; SalasCabrera, E.N ; Garcia-Santiago, FA ; Martinez-Bemal, J.E ; Castillo-Gutierrez, R., An experimental setup for teaching dynamic systems, Electrical Communications and Computers (CONIELECOMP), 2011 21st International Conference on, Feb 28 201 l-March 2011, pp 239-243 [6] Thanhtrung Dang and Minhhung Doan - An Experimental Investigation on Condensation Heat Transfer of MicroChannel Heat Exchangers, International Journal of Computational Engineering Research, Vol 3, Issue 12, pp 25-31(EI) [7] Thanhtrung Dang, Minhhung Doan, Ngoctan Tran, and Jyh-tong Teng - Efi^ect of Configuration on Efficiency of Condensation Heat Transfer in Microchannels - An Experimental Shidy, ISEPD 2014 ... thilt bi ngung tu kenh micro Tgi day hoi ndng nha nhiet cho nudc giai nhiet, thuc hien qua trinh ngung tu ddng ap trd long hoan toan trudc rdi khdi thilt bi ngung tu kenh micro THI L He th6ng thi... dimg d l thuc hien cac thi nghiem truyen nhiet micro, Ngoai ra, he thdng cdn cd the phue vu cho su danh gia hieu qua cac thiet bi trao ddi nhiet khac cho ca trudng hpp luu chat khdng chuyen pha... S4 SI Nuoc vao , Hoi vao Hinh 2: Sa h? thong thi nghiem cac BTDN kenh micro [6-8] Bp trao ddi nhi6t (thilt bi ngung tu k8nh micro) ; Lo hoi mini; Bom mini; Binh chiia nudc; Van xa nudc ngung; Van