NLN* 116 3/2014 M3 ^ DE XUAT s a DO LAI TIET KIEM NANG LlTOfNG DE LAM LANH VA SlTOfl AM VOfI CHILLER GIAI NHIET NlTCTC PGS TS NGUYEN DU''''C LOI*, DH Bdeh Khoa Hd Ngi Bai bao gioi thieu cac so d6 suul im[.]
NLN* 116-3/2014 M ^ DE XUAT s a DO LAI TIET KIEM NANG LlTOfNG DE LAM LANH VA SlTOfl AM VOfI CHILLER GIAI NHIET NlTCTC PGS TS NGUYEN DU'C LOI*, DH Bdeh Khoa Hd Ngi Bai bao gioi thieu cac so d6 suul im mua dong vai he thong diSu hoa khong trung tam nwac c6 may lam lanh nuoc giai nhiet nuoc Bai bao de xuit sa lai va so sanh tiet ki$m nang luong cua cac sa voi cac sa dd lai Wu diim cua cac so dd lai la co kha nang tiet kiem nang luang cao ca vi mua he, ca ve mua dong, don gian vi thiit bi, an toan van hanh cung nhw don gian van hanh Do la cac so su dung cac thiit bi giai nhiet co hieu qua cao khong chi tnDng mua he ma ca mua dong va to rit phu hop v&i diiu kien thai tlSt miin Bac Viet nam Theo tinh todn ban diu, sa lai thap giai nhiet/ nwoc giing va thap giai nhiet/dan kho tiit kiem tai 36,0 va 34,4% nang luxyng so voi sa dd dan kho DC cho ca mua he va mua dong Bang cac ky hieu su* dung t,;: niiiet iiiroc lanh (chilled water) Iv: nhiet 36 ntjoai nha, "C; tj,: nhiet Lr6l"C; l,v;: nhiet nuoc khoi binh ngung (vao ihap giai nhiet) "C; IC, 2C: I chieu, chigu; BI, B2: bcm nude sa cap, thCr cap; BH- Mk bi bay hai; COP: hieu qua n5ng luang (Coefficient Of Performance); DC: dan kho {Dry Coil); MN: may nen; NT: binh ngung; PIC: chi _^s6 lieu ton nang luang rieng (Power Input per Capacity); CT: thap giai nhi?t (Cooling Tower); TKNL: tiet kiem nSng lugng (tuong doi); TTNL: Tieu thu nSng luong (tuong d6i); I.MQOAU Nhiem vu chu ylu cua hp thdng OHKK la Idm lanh v l miia he va sudi am v l miia ddng Mua ddng d miln Nam khdng co nen khdng d n chirc ndng sudi Im Mua ddng d miln Bdc ngin, khdng khdc nghiet Idm nhung vdn khdng thi thilu, nen hp thing OHKK phai cd ea hai chuc nang la lam Ignh vd sudi dm Ddi vdi may dilu h6a ph6ng RAC (Room Air Conditioner) va dieu hda td hgp gpn PAC (Packaged Air Conditioner) thi vipc sudi am la rlt dan gjan vi ehi d n chgn mdy DHKK hai chilu la du Doi vdi hp thing trung tdm nude lanh chiller d n phai phan biet chiller giai nhiet gio vd giai nhiet nude Odi vdi chiller giai nhi0t gid viec sudi dm d i dang nhu ddi vdiPAC vi chi d n sir dung loai chiller hai chilu, Odi vdi chiller giai nhiet nude thi vipe sudi am kho khan han nhilu Do thyc te Id hlu hit cac chiller giai nhipt nude deu diing thap giai nhiet nen khdng t h i thu nhiet tir khdng vdo miia ddng d l sudi am phdng Thong thudng ngudi ta su dung Id hoi dun nude nong hoac dientrd sudi, Cac phuang an tren co nhilu nhugc dilm ve thilt bi, van hdnh * Email: loidhbk@yahoo.com hoac tieu tdn dien nang cao, Bdi bao de xudt cdc phuang an sudi dm kilu bam nhiet vCra t i t kipm dien nang vira dan gian v l thilt bi eung nhu an todn PHAN LOAI CAC PHLCaNG PHAP SLCai AM Hinh gidi thieu cdc phuang phap sudi Im mua ddng khac DHKK CiE pbnag ta cguiii atlCl - NBW atim igiat Umu, dl* MH/i) - Na4T m|l (bt, ao, AQU nil lUi^ DAig van (Uu ibltibfatrt* •bid CM bid •Ent Pbnnigphlp -DiCatrtMM -Nil bat dua aai«atet»iac |:ai,«la.aitB- Hinhi Cdc hp thing DHKK dugc phan lam ba loai chinh la RAC (Room Air Conditioner), PAC (Pakaged Air Conditioner) vd trung tdm nude vdi may Idm lanh nude (water chiller) Nhung theo tieu chi Idm Ignh miia he va sudi dm miia ddng thi phan loai giai nhiet gid vd giai nhiet nude se thuan Ipi hon Vdi mdy giai nhiet gid, d l sudi dm miia dong chi d n ehpn logi may hai chilu ndng lanh Chiller (hoac PAC) giai nhiet nude eung phai phan lam loai Id chilu Ignh yd chilu ndng Ignh Loai chilu ed van dao chilu ddng mdi chdt lanh Binh bay hai trd binh ngung ty va binh ngung tu mua he trd thdnh binh bay hai miia ddng Binh bay hai thu nhiet cua ngudn nhiet d l chuyin len binh ngung Ngudn nhiet cd thi la ngudn nude hoac tCr khdng moi trudng Sau day se gidi thipu chi tilt han sa nguyen ly vdi cdc nguon nhiet khdc nhau, Dk tinh toan tilt kiem nang lugng (TKNL), d day se khdng xet din eac phuang dn sudi Im U * NLN-116'3/2014 truyin thing la dung ndi hoi dun nude ndng hoac diing dien trd sudi, ma chi xet den logi chiller chilu va chiller chilu lanh da biln chilu nhd he thing van dao chilu cho he thong nude qua binh ngung va binh bay hoi MOT S6 SO D SUdl A M M U A DONG 3.1 Sado vdi nguon nhiet la nu'O'c a) Nude mat Ngudn nhiet nude trudc hit dugc phan nude mat va nude nglm Nude mat dugc coi la nude ao, hi, sdng sudi Oli vdi nude phi cd thi lly true tilp (hoac gian tilp qua thilt bi trao ddi nhiet trung gian), tir mgng nude thdnh phd rdi lgi hoan tra igi cho mang nude Rieng nude phi Id dang nua nude mat, nira nude ngdm mang nude duoc bd tri ngdm nhung gdn mat ddt, Nhiet dd nude phd khdng dn t^nh nhu nude ngdm nhung cung khdng dao ddng manh nhu nude mat nen cd thi lly nhiet dp miia ddng cua nude phd la trung binh eua nude nglm va nude mgt, Di dan gian, cdc so dd nguyen ly d day chi su dyng ngudn nude gilng khoan Idm vi du Nude ngudn ddt hay nude mat eung cd so dd tuang ty, khdc biet co ban la nhiet dd nude vdo d binh bay hai vd sy khdc biet lien quan din hieu qua nang lugng cua he thdng Hipu qua nang lugng se dupc d l cap din d phIn vi dy tinh todn b) Nude ngdm Nude ngdm dugc phan idm loai la nude gilng khoan ya nude tir he thing dng dgt ngdm Idng ddt thudng ggi la ngudn ddt (ground source) hay dia nhiet (geothermal) Nude gilng khoan (drilling w/ell) dupe khai thdc nhu sau: Cdn phai khoan gilng du luu luang yeu d u vd phai cdeh du xa d l tranh cdc ddng chay t i t bypass Nude dupe bom len tCr gilng d p cho binh bay hoi sau xa Igi vao I6ng ddt qua gilng thu 2, Sau qua binh bay hai nhipt dp nude giam -^ K He thing nude gilng khoan dugc gpi la he thdng hd [6,7] Do nude nglm thudc dang tdi nguyen dupc nha nude quan ly nen phai cd tham dd, nghien cuu va phai tudn thu phdp luat v l su dung ngudn nude ngdm Nude ngudn dit Id nude tuan hodn he thdng dng dgt ngdm Idng ddt Nude duoc bam hilt len, ddy vdo binh bay hoi rdi lgi ddy trd Igi Idng ddt Nude se thu nhiet d long dit 6^ d p cfio binh bay hoi He thing dng cd thi bo tri ndm ngang d sau 1,2 den 1,8 m cdeh 0,6 m ddi vdi cde edng trinh ed dien tieh mat bdng Idn hoac b l tri thing dirng eac Id khoan sdu 60 den 120 m each khoang m doi vdi cdc edng trinh eao ting nhu van phdng khach san co dien tich mat bing han che Do nude tuan hodn vdng kin nen dugc gpi Id he thong kin Hinh gidi thieu so dd nguyen ly su dung nude gilng khoan ca mua he va miia ddng cho chiller chilu CO van ddi chilu he nuac s VT* XVS O r V3X XV4 -O-t VS* V6X Hinh Scy aa nifac gilng khoan ca h^ v4 dong, chiller chieu Miia he, nifac gieng dimg de giai nhi^t c6n mCia dong nu'6c gi§ng dong vai tro nguon cap nhiet cho chiller Dciy la nhu'ng phircyng ^n c6 hi$u qua nang iifong tot nh§t du'Q'c khuyen khich 4p dung hgi du cSc dieu kien ve nguon nu-dc d^p ling cac yeu cSu cua he th6ng OHKK Tuy nhiSn, m6t s6 tru-ong hgp, thieu di?n tich mSt bang, thilu von hoSc dilu ki^n nIn mong khong cho phep, ngu6n nuoc nglm chi du sO dung de su'oi Im niLia dong, khong du d l giai nhi?t cho miia he V l miia he, nhlt thilt phai dijng thap giai nhiet, nguIn nu'O'c nglm chi co t h i ho tr? them cho thap giai nhiet Chung tSi kiln nghj sii dung so d l lai thap giai nhi§t/ nuac gilng c) So dd la! thap giai nhi|t/ nifffc gilng Sa d l lai la so d l co thilt bj giai nhigt miia hi vS thu nhiet miia dong rieng bi?t d l c6 thi d?t hi$u qua nang iu-gng cao ca miia hi v4 miia dong Hinh gioi thi$u so d l iai nude gilng miia dong va thap giai nhiet miia he voi chiller chilu Miia he thap giai nhigt noi v4o binh ngung, AHU/FCU nli vao binh bay hoi, miia dong, thap giai nhiet duoc tach khoi hg thong, nuoc gilng nli vao binh bay hoi ciin AHU/FCU nli vol binh ngung D l i vol chiller chilu, nuoc gilng va thap giai nhiet dIu nli vio binh ngung, mua hi diing thap giai nhiet, miia dong diing nud'c gilng Khi CO tai nhiet idn vao miia hi, nude gilng cd thi ho tro them cho thap giai nhigt NLN* 116-3/2014'15 l i e MN Hinh So dd lai nude gieng/ thap giai nhiet chiller chilu 3.2 Sa dd vdi ngudn nhiet la khong a) So dd vdi dan kho DC cho ca mua he va mua ddng o l CO t h i thu nhiet tir khdng va elp eho binh bay hoi lam lanh nude can phai su dung vdng tudn hoan nude trung gian Nude thu nhiet tir khdng qua dan khd DC (Dry Coil), van chuyin din d p eho binh bay hai Khi nhipt dd khdng mdi trudng thIp hon 10°C d n phai su dung dung dieh chit tai Ignh nhu edn, glycol,., de chdng ddng bang chit tai Ignh binh bay hai Hon nira, nhiet dp khdng b§n ngodi cang thIp thi hidu suit nang lupng cua he thing cang giam Khi nhidt dp khdng giam din mue nao dd thi hieu qua nang lugng thap han ca eac phuong phap sudi khdc Thdng thudng d chdu Au dli vdi cac hp thing dilu hoa khdng trung tani diing chiller, nhiet dp khdng ben ngoai xudng dudi 5°C ngudi ta dirng chay bom nhiet d l ehuydn sang su dung hp thdng sudi trung tam cua thdnh Nhiet dp dilu hda d p d Ha ndi la 8,6°C, do, noi chung co t h i su dung bam nhidt mdt each hieu qua cho sudi mua ddng ddi vdi cdc hp thing dilu hda chiller tai Ha ndi Hinh gidi thieu sa d l chiller chilu su dung dan khd cho ca mua he vd mua 36ng co van dao chilu h$ nude Hai so rat dan gian, nhung nhu da trinh bdy d [4], dp an todn kdm, hieu qua nang lugng rdt thap, COP khdng dat ydu d u cua Quy chudn Xay dyng Viet nam QCXDVN 09:2013 Bi ndng eao hieu qua nang lugng cho miia he, chung tdi de xudt so lai (ghep) d l ddp ung yeu d u COP v l mua he va ca sudi dm v l miia dong ^VT ^V< Hinh Sa chiller chilu vdi dan khd DC he, ddng b) Sc dd lai DC/ thap giai nhiet So d l lai su dyng dan, dan khd DC cho miia ddng va thap giai nhiet cho mua he 6i eai thien COP qua thdp cua DC miia he Hinh gidi thieu so lai DC/ thdp giai nhiet vdi chiller chilu Hinh Sa dd lai DC/ thdp giai nhidt vdi chiller chieu _ Ddi vdi chiller chilu, mua he, thdp giai nhipt ndi vdi binh ngung, AHU/FCU ndi vdi binh bay hoi (VI ,2,3,4 md, V5,6,7,8 ddng), miia ddng, DC ndi vdi binh bay hoi cdn AHU/FCU nli vdi binh n^ung (V1,2,3,4 ddng, V5,6,7,8 md), day eung cdn luu y Id cd t h i thay thdp giai nhipt bdng ddn udt (Wet Coil - WC) Khi dd nude tudn hoan vdng kin U'u dilm la binh trao ddi nhipt khdng bj Idng biin ddng cgn nude tuan hoan la nude sach Nhugc dilm la phai diing tdi bom la bom so d p , thu d p cho vong nude kin vd bom cho vdng nude hd [3] Nhuge dilm khdc Id nhipt dp nude d binh ngung tang Idn chut it va hieu suit nang lugng giam di chut it, khoang - 5% TINH TOAN HIEU QUA NANG LU'Q'NG Dd bai; Nang sudt sudi cho miia ddng cua Nha Quoc Hdi mdi la 840 kW a) Hay so sanh TKNL sudi Im bdng cdc ngudn nhiet id nude ngdm, nude mat vd khdng 1G*NLN-116'3/20U b) Tinh toan va so sanh TKNL giua cac so k l ca so d l ghep cho ca lam mat mtia he va sudi miia dong, va ca nam, cho biet nang suit lanh la 8480 kW Dilu kien g l c d l tinh toan so sanh D l cd thi su dung nhO-ng kit qua tinh toan da trinh bay a [3,4], cac dilu kien ban dau chon theo dilu hoa d p cho Ha ndi Miia he, nhiet dd ngoai nha IN = 37,8°C, dd Im tuong dli tfu = 53,4°C vdi t,, =29,1°C Miia ddng, nhiet dd ngoai nha tN = 8,6°C, dp am tuong ddi {p^ = 83,4%, nhiet udt t^ = 7,2°C Chiller chon d l tinh toan la ZUW350AY1 cua Daikin, loai chilu lanh, may nen true vit, mdi chit lanh R134a, nang suit lanh danh dinh d nhiet nude giai nhiet tv^2 = 37°C, nhiet dp nude lanh tc2 = 7°C la 1232 kW, cdng suit hiju ich 225 kW Nude tir binh ngung, dua din AHU/FCU d l sudi phdng cd nhi^t dd la 50°C 4.1 So sanh TKNL suo'i I m a) Nude gieng; So d l ap dung duoc gidi thieu tren hinh Nude ngam cd nhigt dp 24''C Nhiet dp nude khdi thilt b| trao dli nhiet trung gian la 20°C, khoi binh bay hoi la 15°C b) Nude phd: Nhiet dp nude vao binh bay hoi la trung binh edng cua nhigt dd nude nglm va nude mat la 16°C (= (25 + 7)/2) Nhiet dp nude la 11°C, tardng hop cd trao dli nhiet tmng gian la 7°C c) Nude mat; Nude mat cd nhiet dp bing nhigt udt la 7,2°C, nhiet dd khdi binh ngung la 5,2°C d) Khdng khi: Nhigt dp khdng 8,5°C, nhiet nude vao/ khdi binh bay hoi la 6,5/ 4,5°C (theo thilt k l cua GMP-IL CHLB Due, nhiet dp ngoai nha 8,6°C duoc lam trdn 9°C [4]) Cd nhilu phuong phip so sanh tieu thu nang lupng (TTNL) tuong dpi nhu so sanh cac ehu trinh ly thuylt, thuc te O day ehpn phuong phap su dung dir lieu thue t l dly dd eua mpt chiller eu thi eua nha ehi tap d l tinh toan Hinh gidi thieu su phu thupc cua COP eua chiller ZUW350AY1 [10] vao nhiet dp nude lanh o binh bay hoi, nhigt dp nude ndng d binh ngung la 35 + 50°C Chiller cua cae hang khac cd ciing logi may nen, moi chit lanh, nang suit Ignh dIu cd eiing biln thien COP gidng Su khSc chut it cua COP giira cae chiller cu thi cua eae hang khac khong gay sai s i dang k l tinh TTNL tuong doi theo % COP tang nhigt dd nude ndng d binh ngung t„2 giam va nhiet dp nuoc lanh d binh bay hoi 1^2 tang, a day cung cin luu y la dudng t„2 = 50°C la dudng ngoai suy tir cae ket qua tinh toan COP tir eac diJ lieu cua catalog Bang gidi thieu kit qua tinh toan COP, TTNL va TKNL cho eac nguon nhiet khac COP 7 11 13 15 Nhi§t nirdc lanh t^, °C Hmh COP chiller phu thuoc vao tc2 va tw2 Bang Hang myc Don v| 3ang tu^r lo^n nirac Mhiet a? 'C 11^6'c vao 'a binh bay nai Mhi$t ILTOC dc 'C Nirac Nu'dc Khong Niroc ma qienq hanh phi yong hd yong ho /ong ho /ong kin \/6nq kin ^onq kin 19/14 16/11 7/5 1,5/4.5 15/50 15/50 15/50 45/50 vao a bint iqirnq DOP iW/kW t,41 3,97 i,22 3,17 =IC iW/kW ).2268 1.2519 1.3106 0.3155 PTNL % r/ /1,9 79,8 18,4 100 !8,1 10.2 1,6 rKNL Theo ket qua tinh toan, so dd su dung nude ngdm eho sudi dm mua ddng ed kha ndng TKNL cao nhlt Theo [6], su dung nude ngam tai Ha Npi eho DHKK trung tdm, TKNL cung la eao nhdt Tuy nhien viec thdm va nghien ci>u khai thdc cdn rlt han chi nen viec O'ng dung ehi eo thi thyc hien tuang lai gdn Trudc mat, neu su dung nude nglm, chi nen u-ng dung d quy md nhd, cho sudi miia ddng 4.2, So sanh TKNL ca nam Bang gidi thieu so sdnh TTNL va TKNL ca ndm, lam lanh mtia he va sudi Im mtia ddng cua cdc so khdc CQng xin luu y d day COP ca nam khong phai la IPLV QCXDVN 09:2013 ma dugc tinh don gian bdng 0,9 x COP mua he + 0,1 COP mua dong vi ty le nang suit sudi miia dong chT bdng khoang 1:9 so vdi ndng suit lanh mua hd COP mua he lly til- [4], ridng COP = 5,99 tra tu" catalog vdi nhi^t dp nude tir binh ngung 35°C vdi gia thilt nude gilng 25°C, nude d binh trao d l i nhi^t trung gian 30°C NLN'116-3/2014'17 Bang Hang mue So d6 dung niyoc gi4ng he va dong (H.2) COP he COP ddnq 5.99 4,41 So d6 jai thap giai nhiet he, ni^dc gilng dong (H 3) So lai IIthap giai nhiet he, dan kho DC dong (H.5) So dan kho DC he va ddng (H4) 5,65 4,41 5,65 3,17 3,58 5.10 5.53 5.40 3.54 COP nam 5,83 0.1852 0.2825 0,1715 0.1808 PIC 100 64.0 65,6 TTNL, % 60,7 34,4 TKNL % 39.3 36.0 Nhu vdy so dd nude gieng he dong ed kha nang TKNL eao nhdt, tdi gdn 40%, sau dd la sa dd lai I Id 36% vd so dd lai II la 34,4% Nhu tren dd trinh bay, so dd nude gilng he dong chua kha thi nen so lai Id giai phap thuc t l nhat hien d l hd thong DHKK trung tam nude su dung chiller giai nhiet nude chilu co t h i Idm viec hieu qua ca mua he vd miia ddng, dd la sir dung thdp giai nhiet eho miia he va su dung nude gilng hoac khdng eho miia ddng K^T LUAN VA KIEN NGHj - Phuang an su dung ndi hoi dun nude ndng 6^ sudi eho eac he thing dilu hda dimg chiller (hinh 3) cd r l t nhilu nhup'c dilm nhu khdng an toan tir ndi hoi va tir kho chua nhien li$u d l chay nd, king kenh gdm ca he chiller va he thing Id hoi, van hdnh khd khan ngudi van hanh phai thdng thao ca van hanh he thing chiller, ea he thing ndi hai Dac biet an toan chdy nd, noi hoi vd kho nhien lieu khd dup'c cac cong trinh eao cdp nhu khach s?n, van phong, trung tam thuong mai, khu dilu dudng, benh vien chip nhdn dd nen su dung so dd lai I hoac II - Cdc sa dd lai tilt kiem dugc thilt bj vi he thong Id gpn nhe, van hanh don gian, lam lanh miia he vd sudi dm miia ddng tren ciing mpt he thdng thilt bj, an toan chay nd cao hon nhilu so vdi phuang an noi hoi vdi kho chua nhien lipu - Dac bi^t, so d l lai rdt phti hp'p vdi dieu kien hdu va thdi tiet cua miln Bdc Viet Nam vi mtia ddng khong k6o ddi, khdng khdc nghiet Idm, nhidt dp khdng ngoai trdi ban it xudng qua thdp dudi 10°C, dam bao cho bom nhiet Idm viec kinh te va hieu qua, khdng cdn dung d i n eae thilt bi sudi bo sung nhu d l i vdi cac viing dn ddi nhiet dd ngoai trdi xudng dudi 0°C Triln khai cdc d l tai nghien cuu ngudn tdi nguyen nude gilng khoan va kha nang su dung nude gilng khoan cho bam nhift miia ddng va ca lam mdt miia he - Khdng nen su dung so DC cho ea miia he vd miia ddng {H.4) nhu GMP-IL da thilt k l cho Nha Qudc Hdi mdi vi tieu t i n nang luong hon gIp rudi so vdi cdc sa lai, khdng dap irng yeu elu COP t i i thilu cua Quy chudn Xay dung Viet Nam va che dp lam viec ndm ngodi pham vi lam viec eua chiller thdng thudng [3,4] SUMMARY This paper presents different winter heating schemes for hydrolic central air conditioning system with water cooled water chiller This paper proposes two hybrid schemes and compares the energysaving of the different winter heating schemes The Advantages of hybnd schemes are the high ability energy saving both in summer and winter, the simplicity of the device, the safe operation and simplicity of operation The hybrid schemes use effective equipments not only for cooling in the summer but also for heating in the winter and proved very suitable for the weather conditions of North Vietnam According to initial calculations, hybrid schemes cooling tower TC / well water and cooling tower TC / dry coil DC can save respectively 34 4% and 36% energy compared to scheme using DC for both summer and winter TAI LIEU T H A M K H A O Nguyen Due Loi Dry cooler - Energy Killer of Chiller System in the National Assembly House in Hanoi, Proceeding International Conference Environmental and Spatial Planing in Vietnam, Hanoi 1st December 2012, p 15-22 Nguyen Due Loi Serious Disadvantages of the Dry Cooler for Water Cooled Water Chiller Proceeding of the 5th Asean AUN/SEED-Net Regional Conference on New/Renewable Energy on September 25-27, 2012 at HUST Hanoi Vietnam Nguyen Due Lci, Nghiem Dinh Cu'O'ng, Pham HCru Hu'ngOanh gia kha nang tiet kiem nang lucng cua H? thong Dieu Hoa khong Nha Quoc Hpi Tap chi Nang Lu-png Nhi#t so 9/2013.1r 12-15 Nguyen Di>c Lo, Nghiem Dinh Cu-cng, Pham HO'u Hyng' So sanh tiet kiem nang lu'gng giOa cac Phu'O'ng phap giai nhiet ctio chiller Tap chi N^ng Lup'ng Nhiet so 11/2013 Nguyin Dijc Lai, Bern nhiet dun nu'^c nong va bcm nhi?t da nang.Tgp chi KHCN Nhi^t 7/2010 trang 15-18 Nguyen Oi>c Lt?\ Nguyin Quoc Viet Investigation and application of geothermal heat pump for air conditioning system in Hanoi Hpi thao Viet Nh$t lan thu- v^ hi§u qua nang lucng toa nha - i>ng dyng c6ng nghe bom nhigt va trO- nhiet 6/2009 Ding Lixing, Chenjifen Advancement Prospects of GSHP {ground source heat pump) Air Conditioning System in HSCW Zone of Chtna (Research Institute of Refrigeration & Air Conditioning, Railway Campus Central South University China) 2002 Kasumi Yasukawa, Isao Takashima, Youhei Uchida {Institute of Advanced Industnal Science and Technology Japan): System perfomiance of geothermal heat pump for space cooling at kamphaengphel Thailand, 2008 Olympia Polyzou GSHP Project Description http //www gres gr 2008 10 Daikin catalog EDS56-801 Engineering data, Water Cooled Water Chiller, cooling only ZUW-AY1{2) Phan bien: GS TS Le Chi Hiep ... qua thdp cua DC miia he Hinh gidi thieu so lai DC/ thdp giai nhiet vdi chiller chilu Hinh Sa dd lai DC/ thdp giai nhidt vdi chiller chieu _ Ddi vdi chiller chilu, mua he, thdp giai nhipt ndi... de xudt so lai (ghep) d l ddp ung yeu d u COP v l mua he va ca sudi dm v l miia dong ^VT ^V< Hinh Sa chiller chilu vdi dan khd DC he, ddng b) Sc dd lai DC/ thap giai nhiet So d l lai su dyng... sa dd lai I Id 36% vd so dd lai II la 34,4% Nhu tren dd trinh bay, so dd nude gilng he dong chua kha thi nen so lai Id giai phap thuc t l nhat hien d l hd thong DHKK trung tam nude su dung chiller