NGHIEN CCfU - TRAD DOI LTNG DUNG CONG NGHE LAM LANH BAY HQI Sii DUNG C H A T H O T A M L N G TRONG DI^U H O A K H O N G KHf THE APPLICATION OF EVAPORATIVE COOLING TECHNOLOGY USING LIQLdD DESICCANTS IN AIR CONDITIONING Nguyen Th^ Bao Vien Phat triln Nang luong BSn viing ISED TOM TAT Bdi bdo trinh bdy ket qud so sdnh giiia so lieu thi nghiem vd chucmg trinh mo phong he thong Idtn lanh bay hai 5W- diuig chdt hut dm long Sau chuong trinh mo phong duac su dung dephdn tich kinh te-ky thuat vd ddnh gid khd ndng img dung cong nghe ldm lgnh bay hai sit dung chdt hut dm long cdc he thong diiu hoa khong diiu Uen Viet Nam Ket qud cho thay, khd ndng img dmg cong nghe rdt hieu qud sit di^ng cho dieu hda khong cdc khong gian lan, tdi nhiet dn cao nhu hoi truong, sieu thi, sdn bay, nhd hdng Til khoa: Ldm lgnh bay htn, chdt hut dm long, dieu hoa khong ABSTRACT The paper presents the comparisons between the results of an experimental study and those of a simulation program for an evaporative cooling system using liquid desiccants Then the simulation program is used to analyze the feasibility of the evaporative cooling technology using liquid desiccants for air conditioning in Vietnam conditions The study shows positive results for this application, especially in cases of air-conditioned open spaces with high latent heat loads such as supermarkets, halls, airports, restaurants, etc Keywords: Evaporative cooling, liquid desiccants, air conditioning D^T VAN DE te, nllien cac he thong deu sii dung ngu6n nang lugng cao cap la dien Theo cac thong ke thi cong suit dien tieu cho he thdng diSu hoa cac cong trinh nhu cao 6c van phong, khach san chi&n tu 45-55% t6ng lugng dien tieu thii [1] Mac du hien CO rit nhiju he thong diSu hoa khong dugc cai tito nham tiSt kiem nang lugng nhu he thing dilu hoa trung tam co luu lupng nuoc, luu lugng gio thay doi theo phu tai, tren co so hieu chmh nang suit lanh sat voi phu tai thuc Cac he th6ng diSu hoa noi tren dgu phii lam lanh ca nhiet hien lan nhiet in, ma lugng nhiet in thucmg chiSm tiit 20%-60% t6ng nang suit lanh loai cong trinh van phong, nha hang, sieu thi, dilu kien thai tiit ben ngoai Vi v$y, he thing dilu hoa thong thucmg phai tin lugng dien dl khu di lugng nhiet in rit dang kl Dl khac phuc vin dl tren, mgt sl'^ ISSN 0866 - 7056 TAP CHl CO KHI VIET NAM, S6 1+2 nam 2017 NGHIEN CO'U-TRAO06l cdc giai phap duoc danh gia cao la ket hgp h$ th6ng di6u hok vai chat hiit am Lithium Chloride (va mpt so chat hut am khac CaCl^, Silica gel, Moleccular Sieves, ) de khu di phan nhiet an khong can dung nguon nang luong cao c4p dien ma chi su dung nang luong mat trdi hay nguon nhif t thai the nang thSp sSn co, giiip tiet kiem duoc dien nang tieu th\i dang ke Tuy theo dieu kien moi trudng ma h$ thOng n ^ co th§ six dung true ti§p nguon nirdc sinh hoat dS lam lanh ma khong can den nude co nhiet dp thip nhu he thong lanh trung tam H$ thong lam lanh bay hoi su dung chat hut am LiCl hay CaCl^ co giai cong suat va nhiet dp gio cap rat rOng, co the rat thap khoaing v£li tram watt, giai cong suat ma may lanh hip thu khong the dap img dugc Ngoai ra, he th6ng lam lanh bay hoi sir dung hoan toan gio mdi dh cap lanh nen tranh dugc nhilm bin cheo, mgt hi8n tugng lay nhilm tir khong gian dilu h6a den khong gian dieu hoa khac Co rit nhiSu ngliien cuu tren thi gidi vk ly thuyet va thirc nghiem cong ngh8 lam lanh bay hoi sit dyng chat hut im long hay ran cho dilu hda khong [2] Mavroudaki va cgng su [3] va HaUiday va cgng su [4] da tiSn hanh hai nghien ciiu dgc lap vh lam lanh bay hoi sir dung chat hiit Sm ket hgp nang lugng mat trdi d nhung ph6 khac t^i chau Au va k§t luan rang, nang lugng dugc ti6t kiem dang kg ling dung cong nghe lam lanh iing vdi mgi loai thdi tidt khac Alizadeh va cgng su [5] da thilt kg, t6i uu hoa va chi tao mo hinh bp tai sinh/B6 thu mat trdi (Regenerator/Solar collector) d6i lira cuong biic Dung dich CaCI dugc su dung la chit htit im va anh hudng cac thong s6 nhu luu lugng khong va chit hiit am cung nhu thdi tilt din hoat ddng cua thilt bi tai sinh dugc khao sat Kit qua khao sat cho thay hoat dpng ciia Bp tai sinh va hi6u suit bp thu mat trdi tang luu lugng khong tang Yadav 16] da mo phong he thdng lam lanh bay hoi sur dung chit hiit im long kit hgp he thing lanh may nen truyen tiling Kit qua nghidn cuu chq thiy, Idii phan tai Sn (latent load) chilm din 90% tdng tai lanh thi he thong c6 thi giiip tidt Idem dugc 80% nang lugng so vdi he thong lanh may nen trayen thing Dai va cpng sir [7] da lam nghien ciiu so sanh giiia he thdng lanh may nen truydn thdng, he thing lanh may nen trayen thdng ket hgp hut am va he thdng lanh may nen trayen thing kit hgp lam lanh bay hoi va chit hiit am Nghidn ciiu cho thay, hai hd thing sau giiip tang tdi lgnh lin lugt 38,8% va 76% va he sd lam lanh COP cua hai he thdng cimg ISn lugt tang 20% va 35% so vdi he thdng l^nh may nen traydn thong Mazzei va cdng su [8] da so sdnh chi phi van hanh ciia he thing may lanh nen hoi va he thdng cd sii dung chat hiit am bing chuong trinh md phdng va cho kdt qua chi phi v§n hanh CO the tidt kidm dugc 35% Trong tmdng hgp chat hiit am dugc tai sinh bing cac nguIn nhiet thai thi tidt kiem chi phi van hanh he thing sit dung hut am cd thd Idn ddn 87% so vdi he thdng lanh may nen hoi Gin day, Kozubal [9] Gao va cpng su [10] da kit hop giira thilt bi hut ira va thidt hi lam lanh bay hoi kidu gian tiep thi nghiem va so sanh hidu qua vdi he thong may lanh cd may nen hoi va cho tiiiy he thdng tilt kiem dugc tu 40-80% nang lugng tidu thu, co thd didu chinh nhidt dp va dd im ciia khdng mot each dgc lap hai thilt bi hiit am vk bay hoi hoat dpng ddc lap Tuy nhidn, d Viet Nam lai co kha it cdng trinh nghidn curu vl cdng nghe [ 11, 12] Vi vay, bai bao mong muln gdp mot phin vao vide nghidn cuu kha nang ung dung cong nghd lam lanh bay hoi sit dung chat hut im Idng cho didu hda khdng tai Vidt Nam MO HINH THI NGHIfiM 2.1 Thilt bi thi nghiem M6 hinhtiiinghidm nghien ciiu qua trinh ISSN 0866 - 7056 TAP CHI CO KHl V I £ T NAM, Sd 1+2 nam www.cokhivietnam.vn 2017 NGHIEN CU'U - TRAO DOI hut im bing chit hiit im Idng LiCl dd ling dungttonghetiidngdidu hda khdng So dd md hinhtiiinghidm nhu hinh va Ngudn nhidt dd gia nhidt dung dich Idn nhidt dd hoan nguydn la nude nong day, dl thuan tidn cho vide thi nghidm thi nude dugc dun ndng bang dien trd Cdng suit cua didn ttd kW, gdm didn ttd vdi cdng suit mdi didn trd kW Do ttong thi nghidm nhiet dung dich dam dac trudc vao thap tach im ta ydu ciu khoang (20-^35)^C, do nude lam mat dung dich CO thd la nude smh ho^t hoac nude lanh tii may I ^ l^nh nude (may lanh water chiller) Nen mo hinh gdm co mot may lanh water chiller dd lam lanh dung dich qui trinh yen can nhiet dp thap va mgt thap giai nhidt nude lam mat dung dich nhidt dung dich ydu cau khong qua thip Hinh He thdng thuc nghiim vd thiet bi ^ao ddi nhie 3.©ANHGIAD0TINCAYCUACHiraNG TRINH M PHONG Dd phan tich kinh te-ky thu$t va danh gia kha nang img dung cdng ngjbid lam lanh bay hoi sit dung chat hut am long ttong cac he thdng didu hda khdng khi, mot chuong trinh md phdng da dugc vidt [9,10] Hmh 3, thd hien giao dien cua chudng trinh md phdng: Hinh Giao diin cua chirang trinh md phong hi thong ldm lgnh bay hai va nham danh gia dp tin cay cua chuong trinh md phdng dua vao sir so sanh giua kdt qua cua chuong trinh md phdng vdi md hinh ttii nghidm nhu da dl cap d phin bdn tren ddi Hinh Sado nguyen ly he thdng ihi nghiem: vdi cactiidngsl trangtiidinhu nhidt dp, dp im tuong ddi, nhidt dp dung dich hiit im ciia thap 1) 131^ giai ahifl niroe; 2) Thip tich am, thap hut am am va thdp tai sinh Dudi day la 3)Hi6p hoan ngiiyen: 4) May lgnh Water Chiller: cac kit qua so sanh giira sl lieutiiinghidm va i) Binh chia dung rijch LiCI/CaCI^ dgm Sac: chuong trinh md phdng 6) Binh chua dung dtch LiCI/CaCl, loang: 7} Bifn tr&gia nki^l: S 9) Van nga JO Bam nti&c ldm mdi, 11.12} Bam nuac lanh 13) Bum tiung dich LiCUCaCl^ loang len thip hodn ngi^en: 14) Bam dimg djch UCl/CaClj dam dqc len Ihip idch dm MN May nin BN: Binh n^mg lii: \m Van nil luu BBH- Binh bay hm Ket qua thi nhidm vdi khdng vao tiiap vdi cactiidngsl t - 34''C,