NGHIEN CUfU-TRAO D I XAY DUKG HE THONG CUNG CAP Nl/dC NONG GIA DUNG KET HOP B O THU NANG LUONG MAT TRCtt VA BOM NHIET DEVELOPMENT OF HOT WATER SUPPLY SYSTEM FOR HOUSEHOLD USAGE UTILIZING SOLAR COLLECTOR AND HOT WATER HEAT PUMP IN COMBINATION TS Nguygn Nguyin An TrUdng Dai hoc Bach khoa H i Npi TOM TAT Bdi bdo trinh bdy viec xdy dUng mot he thong cung cap nUdc nong gia dung ket hdp bg thu ndng lugng mat trdi vd bdm nhiet cho dfa diem lap ddt Id Hd Ngi, co khd ndng cung cdp nUdc nong quanh ndm cho ngUdi sd dung Vdi sd vd nguyen ly hogt dgng cung nhUphUOngphdp vd ket qud tinh todn nhU da trinh bdy, he thong cung cap nUdc nong ndy sd dung bdm nhiet vdi ndng sudt gia nhiet chl bdng td 10% den 12% so vdi mUc cao nhdt vdn thudng dp dung hien nay, doi vdi cung mgt dung tich ehda nUdc nong tinh cho todn he thdng Ket qud ndy, cho thay viec bien cache thong cung cdp nUdc nong gia dung ket hdp bg thu ndng lUdng mat trdi vd bdm nhiet se rdt khd thi tUdng lai This paper presents the development of a hot water supply system for household usage utilizing solar collector and hot water heat pump in combination The developed system was designed to serve people, living in area of Hanoi, Vietnam The system diagram and working principle as well as the methodology and results of the calculations presented in this paper show that the developed system can work well with a hot water heat pump of which the heating capacity is only 10% to 12% of the maximum heating capacity which is often applied to the system of the same hot water storage volume This result promises a good scenario of spreading this type of hot water supply system in future DAT VAN DE He thong cung cap nfldc ndng dung bp thu nang Iflpng mat trdi cd flu diem la tiet kiem ning Iflpng nhflng lai khong dap flng dflpc nhu cau sfl dung quanh nam nen ludn can ket hpp vdi mpt nguon nhiet dfl phong Trong linh vflc gia dung, hai dang nguon nhiit dU phong hay dUpc sfl dung nhat hien Ii dung day dien trd va dung bPm nhiet chung diu hoat dpng bing nguon dien TAP CHI CO KHf VIET NAM *•* nang von tUPng ddi sin cd Uu diem eua ngu6n nhiit dfl phong dung day dien trd la co cau tao don gian, de thflc hien nen chi phi dau tfl ban dau thfldng rat nhd so vdi gia t h i n h chung cua toan bp he thong eung cap nflde nong Nhflpc di^m eua ngudn nhiet Ii co he sd chuyen doi nang Iflpng (diin nang nhiet nang) thap, thfldng nho hOn 1, nen neu phii boat dpng thfldng xuyen se l i m ting ehi phi van hanh he thong Vdi bum nhiet thi ngUpc lai, chi phi dau tu ban dau cho dang S6 1+2 (Thing 1+2 nam 2013) NGHIEN CUfU-TRAO edl thudng rat eao nhflng se mang lai hiiu qua rat Idn nguon nhiet dfl phong phii boat dpng thfldng xuyen cac bPm nhiit hien dai cd he so chuyen doi nang luong k h i cao, thfldng tfl den Ian Theo de xuat eua mpt sd hang eung cap hien [ll, [2], ning suat gia nhiet eua bPm nhiet tflpng flng vdi 100 lit dung tieh binh chfla nfldc ndng dao dpng khoang tfl 0,75 kW den 2,4 kW doi vdi he thdng trung tam loai Idn va cd the lin tdi 3,88 kW doi vdi he thong gia dung lo^i nho Vdi dii lfla ehpn ve ning suit gia nhiet nhfl viy, phUPng an ket hpp bp thu nang Iflpng mat trdi vdi bPm nhiit de san xuat nflde ndng co chi phi dau tU ban dau qua ldn, lam giam dang ke hiiu qua dau tU cung nhu ban che viee bien ddi vdi eic he thong cung cap nfldc ndng kieu niy Do viy, xiy dflng mpt h i thong cung cap nUde ndng dung nang lUpng mat trdi kit hop vdi bpm nhiet de dU phong vdi ehi phi ban dau thap dang li van de rat dUpc quan t i m bien De lam dflpc dieu do, van de can dflpc giai quyet la: (1) Xiy dflng sP va nguyen Iy boat dpng, (2) Xiy dflng logic cung thuat toan dieu kbii'n va (3) Tinh toan ning suat eua eic phan tfl ehinh eau nen h i thong cho chi can mpt bPm nhiet vdi nang suat gia nhiit nho hon nhieu so vdi mflc ap dung hien m i kha nang eung cap nfldc ndng quanh nam cua toan h i thong van dfloc dam bao hinh 1, de d i m bio binh chfla nfldc ndng eua bp thu nang lflpng mat trdi Iuon chfla day nflde, giup b i o v i cie ong ehan khdng hap thu nhiit khong hi nflt vo q u i nhiet hoac "soc" nhiet Binh thfldng, eo du Iflpng bflc xa mat trdi, nflde ndng dUpe tao hoan toan tfl eic ong chan khong bap thu nhiit, dUpc tich binh chfla cfla bp thu nang Iflpng mat trdi v i se phai di qua binh chfla cua bPm nhiet trfldc den noi sfl dung Binh ehda eua bom nhiit luc dong vai trd nhfl mpt binh phu, giup tang kha nang chfla/ tich nhiet eua toan he thong Sfl lflu chuyen eua nflde d che dp niy dflpc tao bdi lUc trpng trUdng giup be thdng cd the boat dpng ca trfldng hpp nguon dien lUdi bi mat O che dp lim viic nay, nUde ndng ed the khdng dupe sfl dung mpt thdi gian dai, nhiet dp nUdc binb ehda cua bom nhiet se bi giam truyen nhiet mdi trUdng xung quanh Khi nhiit dp nUde binb chfla eua bom nhiit khong du cao de dap flng yiu cau sfl dung, bPm tuan hoan se boat dpng giflp thay the Iflpng nfldc "ngupi" niy bang nUde "ndng" Iiy tfl binh chfla cfla bp thu nang Iflpng mit trdi Cie npi dung (1) vi (3) je dflpc trinh bay bai bio niy Do so Iflpng trang in bi ban ehe, npi dung (2) se dflpc tach rieng va trinh bay cae bai bao khac N G U Y £ N L Y H O A T D O N G Hmh I Sd nguyen ly hi thdng cung cap nUdc nong gia dung kit hdp bo thu ndng lUdng mat trdi vd bdm nhiit Hinh Ii so nguyen ly h i thong cung cap nflde ndng gia dung kit hpp bp thu ning lflpng mat trdi va bPm nhiit dflpc xiy dflng bii bio Theo dd, he thong bao gom mpt bp thu nang Iflpng mat trdi sfl dung cie ong hap thu nhiet kiiu chin khong, mpt bom nhiet san xuat nfldc nong dfl phdng, va mot bom tuan hoan nfldc ndng Cic van mpt chieu dflpc lap dat, nhfl the hien Trong phan thdi gian lai, Iflpng bflc xa mat trdi khong du de cap nhiit cho nhu cau sfl dung, bom nhiet se dflpc bit Hai che dp boat dpng cd the dflpc lfla ehpn lue niy Ii: (1) bpm nhiet boat dpng ddng thdi vdi bom tuan hoin de nhiet tao dflpc tich toin bp dung tieh chfla nfldc ndng cua h i thdng (2), minh bom"^ TAP CHf CO KHI VIET NAM S6 1+2 (Thing 1+2 nam 2013) NGHIEN CUfU-TRAO D | nhiit dflpc hoat dpng de nhiit tao chl dflpc tich binh chfla cua bom nhiit, nhd do, giup nhiet dp nfldc dflpc ting nhanh hPn Che dp dau tien dflpc van hanh can mpt lflpng nUdc nong ldn hon nhieu so vdi kha nang dap flng tde thdi eua bom nhiit Ngflpc lai, che dp thd hai dflpc van hanh can mot lflpng nfldc nong khong ldn, tflc thi m i bp thu nang Iflpng mat trdi chfla kip dap flng TfNH TOAN NANG SUAT GIA NHIET CUA BOM NHIET Ning suat gia nhiit cua bom nhiit se dflpc tinh toan de dfl phong cho mpt be thong eung cap nflde ndng ning Iflpng mat trdi, lap dat tai Ha Npi, vdi dung tich binh chfla la 200 lit Chi tiet thong sd ky thuat cua he thong niy dflpc trinh bay trin bang Theo tinh toan, vdi dieu kien lap dit tieu chuan nhfl trinh bay bang 2, h i thong cd the cung cap nUdc ndng cho mpt hp gia dinh vdl so lupng ngUdi toi da la Do viy, nang suat gia nhiit cua bom nhiet can phai dfl Idn de bu eho Iflpng nhiet thieu hut can eho S ngfldi, sfl dung nfldc ndng vao bit cfl thdi diem nao nam Bdng Thong so ky thudt cua he thdng cung cap nUdc nong ndng lUdng mat trdi 3.1 Tinh toan kha nang cung cdp nfldc nong cua bo thu nang liftfng mat trdi De xac dinh Iflpng nhiet thi^u hut, trfldc het can tinh k h i nang eung cap nUde ndng cua bp thu nang lflpng mat trdi Viee tinh toan se dflpc thUc hien theo tflng thing, tren eP sd kich thUde be mat hap thu va thong so lap dit eung nhU lflpng bdc xa mat trdi sin ed tai dia diem lip dat Kha nang eung cap nflde ndng eua bp thu nang Iflpng mat trdi, the hien qua tong nhiit hflu ich ngay, dflpc tinh theo cong thfle sau: Qu = F.It.m ^t,m [kj/ngay] Vdi F [m^] l i dien tieh bp thu nang Iflpng mat trdi, I^^^^ [kj/m^ngiy] Ii tong Iflpng bflc xa tinh trin mat phing nghieng lap dit bp thu ning Iflpng mat trdi va f ^ ^ la hieu suat nhiet trung binh eua bp thu nang lypng mat trdi Dien tieh F ed the dflpc xic dinh tfl kich thflde hinh hpe eua bp thu nang Iflpng mat trdi theo cone thflc: F = w.l [m^] TT Tlimjio Dung tich blnh chiiii nvlOc nonu 200 hi Hao on binh chila Polvurethal Iv trang 30 kg/m', dav 40 mm Loai ong hap thu Chin khong Hi 'lech lOp lot vang, diJfingkmhngoa!5Smtn, dai 175U mm J Sii luong ("mg hSp lhi4 20 ong KiL-hthaoL Lipdal (1 \\V.\H] 17-111 \ 1905x1275 mm Kich Ihiiifcbemal i:apthiHiv\l) 15711 X 16B0nim Vdi w v i I, tflpng flng la ehii'u rpng va chieu dai cua be mat hap thu, dflpc neu bing Bang Viang so lap ddt bg thu ndng lugng mat trdi II niuag.o k,.,l,J,.UI,, N.n ' ' i„ ri"""s>i> Gi.iln '•n2 h \i.l„ill,.N,»l *'"'"sf (2) Gid In ' ^ -' ' (1) -I'-y JiiiihN.ini) ;:,:;; •"'i*-"* TAP CHf CO KHf VIET NAM • Gia tri tong Iflpng bflc xa ngiy tinh trin be mat bp thu nang Iflpng mat trdi, It,m, ed the dflpc xic dinh tfl Iflpng bflc xa ngiy tinh tren mat phang ngang theo cong thfle sau [3]: / =/, R, +T R, \-(Ib^+IdJR^JkJ/rr^ngdy] (3) Vdi I^JkJ/m^ngdyl vd IjJkJ/m^ngdy] tflpng flng Ii cac t h i n h phan trflc xa va t i n xa cua lupng bflc xa ngiy tinh tren mat phang ngang; ^^ \ m ["]' ^d,m("l' ^,.m[^J ^^^f^g flng la cic he s6 chuyen doi ddi vdi cie t h i n h phan trflc xa, tan xa v i p h i n xa S6 l+2(Thang l + n a m ) NGHIEN cflu - TRAO OOl Do dViet Nam chi sin co so lieu ve gia tri trung binh hang thang c i a tdng lilong biJc xa tinh tren mat phang ngang [4], /^_ = I^^ + I^^ [kJ/ m'ngiy] nen day, can chap nhan gia thiet la phan tan xa chiem ti le khoang 30% cira tong xa Khi do, CO the Viet lai cdng thflc (3) nhfl sau: khao sat) cho he so chuyen doi doi v6i phan tnic xa sfl dung cac cong thflc (3) va (4) Theo [5], vdi mat phang nghieng hfldng chfnh nam, y = 0°, gia tri duoc xac dinh nhfl sau: n, - "• "' °t^ - a + ;o J i: „cj.to - S) ,., -r s:a C-i-D o i-cos o cos J r.n L r ', = = (I+cos[3)/2 (5) 3gO , R ^ = p(l-C0Sp)/2 (6) -0 = 3,45.in[^^C2 34 + v-jJ[Q] j - ^^^ ^ ^^ mat trdi dflpc tinh cho tflng nam, vdi n Vdi p [-] la he so phan xa, phu thupc vio l i so thfl tfl cua cie dac trflng eho mdi thing, dac tinh bdc xa cua cac vat v i mdi trUdng xung tinh tfl thing eua nam [6] quanh bp thu ning Iflpng mat trdi, dflpc lay gia tri li 0,2 cho cac be mat be tong hoae ed [3] Ap dung cic eong thflc (4) - (7) vdi cac dac trflng cua thing dflpc xac dinh theo [7], Do hfldng eua tia trflc xa thay ddi theo ed the thu dflpc gia tri cua cie be so ehuyen doi tflng gid ngiy eung nhu tflng va tong Iflpng bflc xa ngiy tinh tren be mat phang nam nen ein phai tinh gii t n trung binh thing nghieng lap dat bp thu nang lflpng mat trdi cho (trung binh tich phan khoing thdi gian tflng thing nhU trinh bay trin bang ^ Tinh todn gid tri trung binh thdng cua tong lUdng bdc xa ngdy cho dia diem ldp ddt bo thu ndng lUdng mat trdi (Hd Ngi) Tiling Ng^y d|c " 11 ,,|^."i| u-Jrad] K **d,„ ^,.„ lg,m [kl/ m' ngiyi h,m |k)/m' ngayl 17/1 17 -2(i,y2 1,577 l,'i23 !,288 0,964 0,007 9879,0 11831,3 16/2 47 •12,95 1,575 1,4M2 1,156 0,964 0,007 9627,8 10643,9 16/3 75 -2.42 1.572 1.555 1,020 0,964 0.007 9292,9 9392,0 15/.1 105 9.41 1,568 1,635 0,897 0,964 0,007 12934,7 11954.9 15/5 135 18,79 1,565 1,702 0,810 0,964 0,007 19632,3 16952.9 11/6 162 23,09 1,564 1,735 0,772 0.964 0,007 18627,7 15588,1 17/7 198 21,18 1,564 1,720 0,789 0.964 0,007 19506,8 16553,-1 1,663 0,859 0,964 0,007 17037,0 15291,3 S 16/8 228 13.45 1,567 15/9 258 2,22 1,570 1.586 0.969 0,964 0,007 16953,3 16529,3 10 15/10 2S8 -9,60 1,574 1,506 1.109 0,964 0,007 15613,8 16749,4 11 14/11 318 -]8,91 1,577 1,439 1,251 0,964 0,007 11762,7 13787,6 12 10/12 344 -23.05 1.578 1,406 1,329 0,964 0,007 11302,2 13865,9 Viic xac dinh hieu suat nhiit q^^ eua bp thu nang lUpng m^t trdi tUOng doi phflc tap vi nd phy thupc vio rat nhieu yeu to Tuy nhien, bii bao niy, r), ^ dupe xie dinh dUa tren chinh lieh nhi?t dp gifla bp thu vdi moi trfldng xung quanh tinh eho don vj cfldng dp bflc x^ mat trdi trin mat phang nghieng lip dit bp thu (gpi li chinh lieh nhiit dp don vj) [8] theo thi hinh De thuan tien, doi vdi bp thu kieu ong ehan khdng (vacuum tube collector) nhfl dflpc Ifla chpn d diy, ed the thiet lap quan he dang h i m so nhfl sau: TAP CHf CO KHf VIET NAM '^ So 1+2 (Thang 1+2 nam 2013) NGHIEN CUfU-TRAO D | (8) = 0,634 - 0.906(A^„)- 4,136(A, J ^ Vdi gii tri trung binh eua chinh lich nhiet dPn vi dflpc xae dinh nhfl sau: 1000/, -3600r,„,^ [K.mVWl nay, nhiet dp nfldc nong toi thieu linh vflc gia dung cd the lay l i 45''C Bdng Nhiet nUdc ndng toi thieu cho mgt s6 doi tUdngsddung (9) Trong do, t^^ va t^^^^ tflong dng l i nhiit dp nflde ndng can''"duy tri v i nhiit dp efle tieu trung binh eho tflng thing tai dia diem lap dit; Tj ^^ [h/ngiy] la so gid nang ngay, tinh tren rnafphang nghieng lip dat bp thu nang lflpng mat trdi va dflpc tinh cho die trflng eua thing theo [3]: Ar„„\K.m'-/\M Hinh Do thi xdc dinh hieu sudt nhiet cua mot so loai bg thu ndng lUdng mat trdi Bang thdng ke nhiit dp nfldc nong can dat cho mpt so doi tflpng sfl dung [9] Theo do, phu hpp vdi mflc sinh hoat eua Viet Nam hien TT Nhiet ["Cl Doi tuong sil dung Chau rCfa - nia lay 40 Chau rfia - cao rau 45 V6i sen va bon tam 43 I a m tn heu 35 ^ Gill giu thuang mai hoac tap the (phong giat may) Tcfi 82 (tuy chat heu vai) Rfla bat va giat giu gia dinh (bang may tu dong) 60 Ve smh phong phau thuat 43 ' He th6ng rfla hat kieu phun cong nghiep - khau rfla Toi thieu 65 He thong rfla bal kieu phun cong nghiep - khau xa trang 82-90 De d i m b i o nhiit dp nflde ndng toi thieu nhfl d i chpn, ke den ton that nhiet tromg toan he thong, dac biit l i tren dfldng ong dan tfl binh chfla nfldc ndng den nOi sfl dung, nhiet dp nfldc ndng can tri dflpc chpn d diy li 48°C Ket hpp vdi eac gia tri nhiit dp cUc tii'u trung binh cho tflng thing xac dinh theo [10], i p dung eic cong thflc vfla trinh bay, ed the tinh dflpc eae gii tri trung binh cua hiiu suat nhiet v i tdng nhiet hflu ich ngiy nhfl trinh bay bang Bdng Tinh todn gid tri trung binh thdng cua tong nhiit ngdy cho nhiet hUu ich, nhiet cdn cdp vd nhiit bo sung Thang ''„„ Qbs [kl/ ngayl [rad] [k|/m-ngay| (h/ngayl ["c'l [K mVW] [kj/ngay] [kJ/ngay) 1,577 11831.3 12,05 13.8 0,1254 0,455 14169.3 32211,3 18042,0 1,575 10643,9 12.03 11,7 0,1477 0.410 11476,5 34189,2 22712,7 18219,5 1,572 9392.0 12.01 17,5 0,1404 0,425 10507,0 28726,4 1,568 11954,9 11,98 20,8 0,0981 0,505 15887,2 25618.3 9731,2 1,565 16952,9 11,96 23,9 0.0612 0,563 25105.6 22698.6 •2407,0 1,564 15588,1 11,94 25,5 0,0621 0,562 23033,3 21191,6 -1841,7 1,564 16553,4 11,95 25,7 0,0580 0,568 24710,9 21003,3 -3707,6 1,567 15291,3 11,97 25.4 0,0637 0,560 22502,0 21285,8 -1216.2 1.570 16529,3 11.99 24,3 0,0619 0,562 24433,5 22321,8 -2111,6 10 1,574 16749,4 12.02 21,6 0.0682 0,553 24358,1 24864,8 506.7 II 1,577 13787,6 12,04 !8,2 0.0937 0,513 18593.7 28067,1 9473,5 1^ 1.573 13S65,9 12,06 15,0 0,1033 0.496 18098,7 31081.1 12982,3 TAP CHi CO KHI V l f T NAM V S6 1-1-2 (Thang l-^2 nam 2013) NGHIEN CUfU-TRAO D | 3.2 Tinh toan hiang nhiet can de dun nfldc ndng va hiang nhiet bd sung cho he thong cung cslp nfldc nong bang nang Ifldng mat trdi De dfl phong cho nhu eau sfl dung nfldc nong cua ngfldi, trfldc bet, can tinh nhu eau tdi thiiu ve nflde nong eho ngfldi dieu kien sinh hoat gia dinh v i ket hpp nhu eau niy vdi kha nang dip flng cua bp thu nang lflpng mat trdi Do hien t?i chfla ed tiiu ehuan riing cho he thong cung cap nfldc ndng nen d diy, nhu cau ve nfldc ndng toi thieu dflpc tinh dfla tren nhu ciu ve nflde sach vdi eung doi tflpng sfl dung Theo [11], ed the xac dinh tiiu chuan dung nfldc cho ngfldi dieu kien sinh hoat gia dinh l i V^ = [ngfldi] xl 50 [lit/ngfldi/ngay] = 750 [lit/ngay] Trfldng hpp cd trang bi be thdng cung cap nfldc ndng trung tam, tiiu ehuan dung nfldc lanh cho ddi tflpng sfl dung trin, eung xac dinh theo [11], li V^= 0,7 V, = 0,7 x 750 [lit/ngay] = 525 [lit/ngay], Nhfl viy, eo the xac dinh tiiu ehuan dung nflde nong trfldng hpp la V^,^ = V^ - V^i = 750 [lit/ngay] - 525 [lit/ngay] = 225 [lit/ngay], Vdi Iflpng nfldc ndng can sfl dung nhfl da xac dinh, cd t h i tinh nhiet Iflpng can de dun nflde ndng theo eong thflc: [kT/ngiy] " "" '"'"' " •"" (11) Trong do, G^^ [kg/ngay], p^^ [kg/m^], va C^ [kJ/kg.K] lan Iflpt la khoi lUpng, khdi lUpng rieng va nhiet dung rieng eua nfldc can dun Khi do, Iflpng nhiet bo sung eho h i thong cung cap nfldc ndng bang ning Iflpng mat trdi cd the dflpc tinh theo: Qh, = Qnn-Qu[kI/ngiy] (12) Gii tri trung binh thing cua tdng nhiet lupng ein de dun nflde nong va bo sung eho moi ngiy, tinh theo cic eong thflc (11) v i (12), cung dflpc trinh bay bang Co the nhan thay d day, h? thong eung cap nfldc ndng bing ning lfldng m^t trdi tao Ifldng nfldc ndng thfla so TAP CHf vdi nhu cau sfl dung chi thdi gian tfl thing den thing hing nam Trong nhflng thing eon lai, can bd sung them nhiit Iflpng nhiit tfl bPm nhiit vdi gii tri Idn nhat la 22712,7 kj/ngiy vao thing hing nam Phan tiep theo cua bai bio se trinh biy viec tinh toin nang suat gia nhiit cung nhfl lfla chpn bPm nhiit du k h i ning de bo sung eho Iflpng nhiit thieu hut niy 3.3 Tinh toan nang suat gia n h i i t cua b d m nhiet dfl phong Do die diem eua he thong cung cap nflde ndng bang nang Iflpng mat trdi li ed nang suat gia nhiet rat nhd so vdi dung tich binh chfla nen thdi gian lim viic lien tue can thiet de cd the tao Iflpng nfldc ndng theo yeu eau dflpc coi la bing chinh so gid ning ngay, T [h] Nhfl da tinh toin vi trinh bay bang 5, so gid ning ngiy doi vdi mat phing nghiing lip dat bp thu thay doi khong nhieu gifla eic thing nam vi dao dong quanh gia tri 12h/ngay Nguyen nhin eua hien tflpng la goc nghiing lap dit |i eua cie bp thu phing ludn dflpc tinh toan de nhan dflpc nhiiu bflc xa hPn vao mfla ddng va it bde xa hPn vao mua be, so vdi mat phang ngang Gdc nghiing lap dat p, dflpc chpn bii bio, cd gii tri xap xi vi dp cfla dia dii'm lip dat Ii de nhin dflpc Iflpng bflc xa ldn nhat nam Lflu y rang, "so gid ning" ma eon ngfldi van cam nhin eung vdi quan niim dai - dim ngan vi mua he va ngflpc Iai, ngin - dem dai ve mfla ddng chi dung xet trin mat phang ngang Neu coi bpm nhiet can bo sung iflpng nhiet thieu hut khoing thdi gian bang khoang 1/2 sd gid nang ndi tren, tflc T^^= h, ta cd the xac dinh ning suat gia nhiit toi thieu cua bom nhiit trfldng hpp niy nhfl sau: % = Q^riv = 22712,7/(6 X 3600) = 1,05 kW (13) 3.4 Tinh toan lflu IflPng bPm tuan hoan nfldc nong Vdi gii thiet dp chenh nhiit dp nfldc ndng vio/ra bom nhiet la A = K, cd the tinh Iflu'^ CO K H i V I £ T NAM V S6 1+2 (Thing K nim 2013) NGHIEN CUfU-TRAO D | lflpng b p m tuan hoan nflde ndng dfla tren n i n g suit gia nhiet cua bom nhiit theo cong thflc: KET LUAN Bii b i o da xay dflng dUpc sP dd he thong eung cap nUdc ndng gia dung k i t hpp bp thu nang lUpng mat trdi va bPm nhiet cung nhfl di xuat dflpc nguyen Iy boat dpng va phflpng phip tinh toan n i n g suat cua cae phan tfl ehinh eau 3.5 Lfla ehpn b o m nhiit cho h i thdng n i n he thong C i e ket qua tinh toan cu the cho thay, phflpng i n Ifla ehpn bom nhiet Tfl nguyin ly hoat dpng cua he thong nhu vdi nang suat gia nhiit tflPng flng vdi 100 Ht tong trinh biy mue va kit qua tinh toan nang dung tieh chfla nflde ndng eua toan h i thong lan suat gia nhiet cua bom nhiet nhfl trinh biy Iflpt l i 0,38 kW v i 0,46 kW hoan toan cd kha muc 3.3, hiin co rat it sin pham bom nhiet sin nang bd sung dflpc Iflpng nhiet thiiu hut tai bat CO tren thi trfldng ed the dap dng dflpc cac yiu ky thdi diem n i o nam Vdi nang suat gia eau de Tuy nhien, vdi mue dieh tham khao, nhiet eua bom nhiet nhd nhfl viy, bii b i o cho thay k h i n i n g khic phtic dflpc nhflpc diem ve phflpng i n Ifla chpn cd the de xuat d diy li: ehi phi dau tfl ban dau q u i ldn doi vdi cie he thong cung cap nfldc nong gia dung ket hpp bp - Sfl dung bom nhiet Midea, model CEthu nang lflpng mat trdi va bPm nhiet la hoan RSJ-15GW/80RDN3, dung tich binh chfla nfldc toan k h i thi • nong 80 lit, nang suit gia nhiit 1,3 kW [1], hoac G^,, = Q,, / (C, A J = 1,05/(4,186 x 5) = 0,05 kg/s = 180lii/h " ' (14) - Sfl dung bpm nhiit nghiin cflu che tao nflde, dung tieh binh chfla nflde ndng 50 lit, nang suat gia nhiit 0,95 kW [12] Ngay n h i n bii: 12/01/2013 Ngay p h i n biin: 18/02/2013 Ngfldi phan bien: PGS.TS Tran The Sdn Trfldng Dai bpc Bach khoa H i Npi Tai liiu tham khao: [1] Hot water heat pump catalog The international division, Midea air conditioning and refrigeration sector, 2012 [2], May nUdc nong nang Iflpng khong thong minh Heat pump Jiko & Topaz, catalog gidi thieu san pham, Cong ty TNHH MTV SX TM DV Hoang Ngoc, 2012 [3] Sukhatme S.P Solar energy principle of thermal collection and storage.Tata McGraw-Hill publishing company limited, 1992, [4] Hoang Huy Thang va cpng sU Kien triic va hau nhiet ddi Viet nam, NXB Xay dflng, 1997 [5] Liu B.Y.H., Jordan R.C Daily insolation on surfaces titled toward the equator Transactions, ASHRAE, 67, 526(1961) [6] Cooper RI The absorbtion of solar radiation in solar stills Solar energy, 12, (1969) [7] Klein S.A Calculation of monthly average insolation on tiltled surfaces Solar energy, 19, 325 (1977) [8] US Army Installations Management Command (IMCOM), US Army Corps of Engineers (USAGE) and the US Department of Energy Federal Energy Management Program (DOE FEMP) Central solar hot water systems design guide 2011, [9] 1999 ASHRAE Handbook HVAC Applications 1999 [ 10] Nguyen Dflc Lpi Hudng dan thiet ke he thong dieu hda khong NXB Khoa hpe va ky thuat, 2003 [11] Tieu chuan Viel Nam - Tieu chuan cap nUde ben - Tieu chuan thiet ke TCVN 4513-88 1988 [12] Nguyin Nguyen An, Nghien cflu che tao bOm nhiet dun nUdc ndng gia dung Tap chi Nang lUdng nhi$t, 109, 1/2013 TAP CHf C O KHf VIET NAM Sd 1+2 (Thing 1+2 nam 2013) ... Sd nguyen ly hi thdng cung cap nUdc nong gia dung kit hdp bo thu ndng lUdng mat trdi vd bdm nhiit Hinh Ii so nguyen ly h i thong cung cap nflde ndng gia dung kit hpp bp thu ning lflpng mat trdi... I a m tn heu 35 ^ Gill giu thuang mai hoac tap the (phong giat may) Tcfi 82 (tuy chat heu vai) Rfla bat va giat giu gia dinh (bang may tu dong) 60 Ve smh phong phau thuat 43 '' He th6ng rfla hat... dflpc thUc hien theo tflng thing, tren eP sd kich thUde be mat hap thu va thong so lap dit eung nhU lflpng bdc xa mat trdi sin ed tai dia diem lip dat Kha nang eung cap nflde ndng eua bp thu nang