NGHIEN cufu - TRAO D6

NGHIEN cufu - TRAO D 6 | NGHIEN CU'U TICH HgP NANG LU'aNG MAT TRCXI VAo TRONG BOM NHIET DE NANG CAO HIEU QUA

SAN XUAT Nu'dc NONG

STUDY OF INTEGRATING SOLAR ASSISTED HEAT PUMP TO IMPROVE EFFICIENCY OF HOT WATER PRODUCTION

Nguyen Thanh DungS Le Chi Hiep^

'Cdng ty TNHH Le Phong

^Trudng Dai hpc Bach Khoa TP. Hd Chi Minh

TOM TAT

Hien nay, co rdt nhiiu phuang phdp de sdn xudt nuac nong. Nhung mpt trong nhung phuong phdp noi bat Id sdn xudt nuac nong bdng bam nhiet Tuy nhiin, truac bdi cdnh thieu hut ndng luang, thi viec nghiin ciht tich hpp ndng luang mat trai vdo trong bam nhiet nhdm ndng cao hieu qud sdn xudt nuac nong, ciing nhu hieu qud su dung ndng lupng Id huang di mai. Kit qud ly thuyet vd thuc nghiem chi ra rdng, khi tich hpp ndng luang mat trai vdo trong bam nhiit thi he so COPh cUa chu trinh khodng tir 4 - 6 khi nhiit dp nuac nong trung binh ddu ra tir 50 -^ 60 "C vd cuang dp buc xg mat trai trung binh tu 600 -^ 750 WM. Vai kit qud nhu trin, thi hi thong bam nhiet co tich hap ndng lupng mat trai se tot hon so vai bcrm nhiet kiiu truyin thong, vi COP^ cua bcrm nhiet kieu truyin thong chi khodng tir 3,5 ^ 4,5, de dgt duac cung dieu kien ddu ra nhu tren.

Tir khoa: Bam nhiet, sdn xudt nuac nong bdng bam nhiet.

ABSTRACT

Currently, there am many methods to produce hot water and one of them is heat pump application.

In the context of energy shortage, studies of integrating solar energy into heat pumps to improve efficiency of producing hot water, as well as to raise energy efficiency, is the new research direction.

Theoretical and experimental results show that, by integrating solar energy into heat pump, the system would have the average Coefficient Of Performance heating (COP^ of between 4-^6 with the average temperature of hot water is 50 ^ 60 "C and average solar radiation intensity is between 600 — 750 W/m^. With such results, the system integrating solar energy into heat pump is much better than a traditional heat pump. Due to traditional heat pump has the average Coefficient Of Performance heating (COPh) of between 3,5 -^4,5 to reach the same output condition as above.

Keywords: Solar Energy Integrated into Heat Pump; Collector '^

NGHIEN cufu-TRAO D 6 I

1. DAT VAN DE

Theo mpt sd bao cao, nang lugng heu thu cho qua trinh san xuat nudc ndng hong cac tda nha va khach san d Viet Nam vao khoang 4,5%, tdng nang luong tieu thu ciia tda nha, khach san [1] va khdng ngiing tang len, cdn d cac khu dan cu la khoang 1 GJ/hd gia dinh/nam [2], Cac phuang phap san xuat nudc ndng d Viet Nam chli yeu la bang nhien Heu hda thach, dien nang thdng qua dien hd, bom nhiet, nang Iugng mat hdi. Tuy nhien, diing trudc cac thach thiic ve thieu hut nang Iugng hong tuong Iai, thi g3n day, cdng nghe san xuat nudc ndng bang bam nhiet cd tich hgp nang lugng mat trdi da dugc nhieu nha nghien ciiu phat trien. vi mdt sd uu diem ciia he thdng. Theo B. J. Huang, J. R Chyng [3] va R. G. Morgan [4], ve ca ban he thdng bam nhiet cd tich hgp nang lugng mat hdi se bao gdm mdt chu trinh nhiet ddng ngugc chieu dugc ket hgp vdi mpt dan collector mat trdi. So dd nguyen ly dupc gidi thieu nhu hinh 1 ben dudi.

Ve ca ban, nguyen Iy hoat ddng cua he thdng bam nhiet cd tich hgp nang Iugng mat trdi hoat ddng gidng nhu ciia mpt he thdng bam nhiet kieu truyen thdng (Air source Heat Pump), d^u thuc hien 4 qua trinh nhiet ddng ca ban ciia chu trinh nhiet dpng ngugc chieu. Diem khac biet it chd dan lanh dng canh (khd cd the hap thu dupc biic xa mat hdi) dugc thay bang dan collector mat hdi de hap thu dugc biic xa mat hdi.

2.2. Cong thuc tinh toan Iy thuyet cua he thdng Gia sii rang, tat ca qua trinh hong he thdng deu la ly hrdng thi nang lugng rieu thu tai may nen cdng vdi nhiet Iugng hap thu tai dan collec- tor se can bang vdi nang Iugng hiiu ich ma nudc nhan dugc do mdi chat nha ra tai dan ngung.

Vay, nhiet Iugng hiru ich ma nudc nhan dugc do mdi chat nha ra tai dan ngung la:

Vi vay, ndi dung chinh trong bai bao la Qk ~ Qo"'" ^k. ^

f*/T cnt l \ / t l l Y l t / ^ t \r^ Vtm-n rtUio*- r.A i-i^V,

trinh bay co so ly thuyet ve bom nhiet co tich hop nang luon^ mat troi de lam co so tfnh toan, nghien cihi che tao he thong bom nhiet co tich hop nang luong mat troi va thuc hien do dae thuc nghiem ciing nhu dira ra danh gia v^ ti§m nang iing dung he thong a diSu kien thoi tiit TP.

Ho Chi Minh noi rieng va Viet Nam noi chung.

2. TONG QUAN \ E CO SO LY THUYET CilA BOM NHIET TICH HOP NANG LU'ONG DE SAN XUAT NU^dC NONG 2.1. Nguyen ly hoat flong ciia he thdng

(1) Theo S. Ito, N. Miura va K.Wang (1997) [5], nhiet lupng ma moi chat Mp thu tir dan collector tren mot dem vi dien tich ducrc cho boi cong thirc sau;

q, = I.a-q^W/m2 (2) Trong do I: La cuong do buc xa mat troi

toi collector/dan bay hod (W/m^);

a- La he so hap thu cua collector/dan bay hoi;

q^: la ton that nhiet tu collector va dugc xac dinh boi cong thiic ben duoi theo cac nha nghien ciiu S. Ito, N. Miura va K. Wang [5].

q, = E.q^ + U.(Tp-Ta) W/m^ (3)

Hinh 1: Sa dd nguyen ly he thong

Vdi e: La he sd phat xa.

U: La tdng he sd tdn that nhiet tir collector (W/m'.dd);

T^: La nhiet dp ldp hip diu/ tSm h ^ thu (K);

T^: La nhiet dp khdng khi xung quanh (K);

ISSN 0866 - 7056

TAP CHi CO KHi VIET NAM, Sd 5 nam 2015 www.cokhivietnam.vn

NGHIEN cufu-TRAO e 6 l q^: La su chenh lech giua nang lugng

phat xa hen mdt dan vi dien tich tu vat den d nhiet dp mdi trudng khdng khi xung quanh va nang lugng phat xa tu bSu hdi qco.

Voi U trong cdng thiic (3) la tdng he sd tdn that nhiet tu collector/dan bay hai tdi khdng khi xung quanh va dugc xac dinh bdi cdng thiic sau [5]:

U=h^+ Ascffl W/m^.dd

U - U + U + U W/m^dd Trong dd:

Qo=A-J^'-qoW (6)

Trong do: A^: La dien tich collector (m^).

F': La he sd hieu qua cua collector/ dan bay hoi dugc cho bdi Hohel-Whilliar Bhss.

Hieu suat Collector/dan bay hai (i]):

(4) ^{77 =} I.A^

(7)

Trong do, o: La hang sd Stefan-Boltzmann a = 5,669.10-«W/m^K''.

h^: La he sd truyen nhiet ddi luu cudng biic do tac ddng cua gid hen be mat collector/

dan bay hoi va dugc xac dinh theo cdng thiic cua McAdams va Jurges.

Tuy nhien, he sd U trong cdng thiic (4) chi xet cho trudng hgp ma collector/dan bay hai khdng sii dung khung phti, cdn neu collector/dan bay hai ma dugc phii bang khung kinh de tao hieu ling nha kinh thi theo Le Chi Hiep [6], he sd UL se dugc xac dinh nhu sau:

Tdng he sd tdn that nhidt cua Collector/

dan bay hoi cd ldp phu nhu sau [6]:

Theo M. Raisul Islam and K. Sumathy [7] luu lugng mdi chat lanh di qua may nen cd the tinh theo cdng thiic sau:

»^r ^Psvc-rj.y^ "P- 60 kg/s (8) Trong do; p^^^: Khdi Iugng rieng ciia mdi chat d ngd vao may nen (kg/m^).

T|^: Hieu suat the tich hiit;

V^^^ : The tich quet ciia piston (m^/vdng);

N ^^: Sd vdng quay ciia may nen (vdng /phiit).

Cdng cap vao may nen:

^b='^r(.h-h)^^.se. kW (9) (5)

hayW^ ^n Uji La he sd tdn that d phia mat hen ciia

collector/dan bay hai W/m^.dd.

Uj^: La he sd tdn that d mat day ciia collector/

dan bay hai W/m^.dd U^ la he sd tdn that d phia cac mat ben cua collector/dan bay hai W/m^.dp.

Cudi Cling, nhiet lugng hap tiiii hen toan bp dien tich collector/dan bay hoi dugc cho bdi Dufhe va Beckman nhu sau:

n,sen

tef

⁽¹⁰⁾

Vcfi r|^^^^: La hieu suat nen doan nhiet.

Hieu suat ciia he thong bom nhiet:

COP,

.a.

⁽¹¹⁾

NGHIEN Ctfu - TRAO DPl

3. TINH TOAN LY THUYET VA BO TRI THI N G H I f M 3.1. Tlnh toan ly thuyit

Bdng 1. Thdng sd die lieu ddu vdo Mo ta thong so

Cudng do biic xa mat trcn tmng binh I ^ (W/m^ j

Van toe gio trung binh V (m/s) Cong suat may nen piston (HP)

So vong quay N ^^ may nen (vong/phiit)

The tich quet ciia piston V^^

(m'/v6ng)

Ap suat ngung tu cua mdi chat Ap suat bay hoi cua moi chat Dien tich collector A^ (m^) He so hap thu cua collector a He so phat xa cua collector £ Be day ciia tam hap thu 5 (m)

Ket qua 750

1,5 1/3 (cua hang LG Model

LXllOLAJM) 1500 (±2%)

0,00001103 20

5 1x1,2

0,9 0,6 0,0003

Md ta He so din nhiet cua tAm hdp thu (Nhom) \ (W/m.dd) Dp den ciia tam h§p thu z^

Do den cua tim phu s^

B8 day ciia tam each nhiet (mdp xdp polyuretan) 5 ^ (m) He so dan nhiet cua tam each nhiet \^^ (W/m.do) Dudng kinh trong cua dng dong Dj^ (m)

Dudng kinh ngoai cua dng dongD^^ (m)

Be day cua ong ddng 5^ (m) BQioang each giua hai ong ddngW (m)

So tam phli N Gdc nghieng p (do)

K^t qua 204

0,95 0,88

0,025

0,00198 0,0101 0,0127 0,0012 0,07

1 20 J 2. Kit qud tinh todn ly thuyet

Mo ta thong so U, (W/m'.do) UJ (W/m=.4g) U_ (W/m'.do) U^ (W/m^dg)

He so hieu qua ciia collector F' Hieu suat canh F Q„(W)

Ket qua 6,25 0,079

0,29 6,626

0,97 0,96 625,768

Mo ta Hieu suat \ ra, (kg/s) Hieu suat T[, Wj,(W) Qi(W) He so COPj HlSu suat Collector ii (%)

Ket qua 0,591 0,00401

0,9 143,95 769,713 5,34 69,5

ISSN 0866 - 7056

TAP CHi CO KHi VIET NAM, Sd 5 nam 2015 www.cokhivietnam.vn

NGHIEN cufu - TRAO D 6 I

3.2. Mo ta va b6 tri thi nghifim

He thong la sy ket hgp cua cac thanh phan thiet bi nhu hong bang dir lieu d4u vao va cd sa dd can tao nhu sau:

Bioh cti ta DUK DDng CIU bi (hocg bmi nba

luatiaajlK/ / \ o n g G o p O i :

-DvciBgR134)\-» (^TTuftljifcapioat

{pCifn biM do abti d^

Hinh 2: Sa do cau tgo ditng de thi nghiem cho he thong bam nhiit tich hpp nang lupng mat trai de sdn xudt nuac ndng fPA3)

Hinh 3: Mo hinh thi nghi&m thuc ti cho hi thong bam nhiet tich hap nang luang mat trcn di sdn xudt nu&c

nong (PAS) "^

NGHIEN ctfu-TRAO Dpi

4. K E T QUA

Bdng 3. Ket qud thl nghiem cua he thdng bam nhiet cd tich hap ndng luang mat trdi (PAS)

BufAta

sn

1

.»

4 t a T t 1 ID II i ; 11 14 1}

It IT U It JD 21

2}

2*

\ # ] > *

i : - o i - » i )

11 1

1 1 1 . : nm

^m

*S0 IUU) l U l D 10 » l o w 1 0 4 0 I 0 5 4 HOD II 10 II ^>

It 10 1 1 4 0 II <0 i;oo t: to i : a i I:TO 1^40 i:."*

i } « i 1 ) 1 0 13_!0 IIJO

• 4 I M

I K W >

»]>

«40 M ? h "

WJ 7 ^ mv Ux

»w tLfl ksn MO I U

•iW

«!»

•»;i

« ? ) 740 TTO KS VO

U I 7*0

> a i < i «

C

M l

n :

US

H*

1^1 V l

M <

m^^tafatmcuttAitrtiKmiimyi^m

ngimg IU piTV [ t v l

• t i 4 6 '«K 1 0 ; 10 K i i : ] i ( i i ; i ; i :

r.:

u 14 1 14 h 1 5 4 Id lb*

IT 17 7 IN IKS n

M J

m«

i l u

piT(taii

«*

v«

t i l o ; lOK i i ; i i « i ; i ; . ' t i i i<

n«<

1 4 ; * 14 T*

m * H ^ J it. I t l t i 4 5 IT<..»

I 7 f l j l « 7 5 IKMt 19.7*

M L I 5

»_«

4 4.1

*2 4 1 4 1 4 2 » 4 4 4 <

4 « 4 7 4 k 4 7 4 b «

'

t 1 t ; . t j J : 5 )

'»

l i )T J 6

ApuA

B c a h n (bBl

1 « 4 0 5 4.1}

4 « 4 W 4 ; 4 »

**i 4-55 itfi 4 7<

4 64 4 6 4 9 5 5 0 5

< l « J I ! 5 1 5 J-15 J 45 5 4 5 5 S S 5 6 5 5-55

• M « t i l i i i > h i i > * t i

d n

»

Jl ) ] J 5 I 16 i l l

w:: vtt, 4 1 7 4 1 ! 4 H 4 J J 46 47 49 5 0 S 51 J

*':

5 5 7 5 6 1 5115

* i i

*)*

d B h A i i i *

u i V i

I I J Ji-2 JTT }»2 - U I 4 ; 4 ) 1 45 4 4 6 « 4 > ^ 50

*u

*:>

*!*

5 5 1

.**>

5«

51* \

«0.^

6 1 4

* i $

»S.T M J

1 , 1 * 1 1

51 U . 4

* • - } TD TO U 4 65 6 7 * M 4 M l M 4 70 TDT T:

7 1 6 Tit 75 T6L7 TT 7X4

»

T U T9 7«.6

r n t y n o

I « l 1X9 III I*.*

IHI X2 ::•}

n M S : * h : ? r i n

^t a *

^91 X

» i :s M S

^ 9 4 N

M a i j

i V )

M t j 5 9 4 5 2 1

« I 4 5) 51 [ SIX 51

<;

< : 4 V ) l 4 9 4 50 49 9 5 0 6 5 0 » ' ; i 5 : 7 54 5 ) 2

53 5 1 S

I J I J I S I K l<t I W 1 % 195 195

; i

; 1 ' 1

;; :.: _:)

i j

: J 1 4

D 4 i

l l M i

u

i i '

1

IA

: 1 1

Dua vao ket qua thi nghiem hong bang 3, ta cd thd xay dung dugc cac dd thi bidu diln nhu ben dudi:

,- Anh huong ciia biic x? m^t uin den nhi?t d p bay boi

Tkn gian ihi oghi^

^ " Biic x» mji trin dodmjc PK/ml) NTIKI d^ <UuhiJt m ^ nen I4 (OC 1

Hinh 4: Bieu do the hien dnh huang ciia cuang dp birc xg mat trai din nhiet dp bay hai cua bam nhiit tich hap ndng luang mdt trdi

ISSN 0866 - 7056

TAP C H i C O K H i VIET NAM, Sd 5 nam 2015 www.cokhivietnam.vn

NGHIEN Ctfu-TRAO D O I

.^ Anb haaof cua buc x? mH inn den sp suat bay hoi 5 lOOO _ 6 1 I 800

? 200

I 0 J5 ^ . ,

Tbn g M tU iifluin

^ » Bw X* mti troi doilupc (W nC) Ap «uii t M lUa bay b n p n (b«r)

/fmA 5.- Sieu do the hiin dnh hudng cua cudng dp birc xg mat trai den dp suat bay hai cua bam nhiit tich hap ndng luang mat trai

S.. sanh COP.- va COPrr

95 W 45 50 " eo 69 Vhict do iiaiK nong Inmi biidi Jaii rn i C)

Hinh 6: Bieu do so sdnh COPh(LT) vd COPh(TT) theo nhiet do nuac nong trung binh ddu ra cua bam nhiit tich hpp ndng lupng mat trdi

Bdng 4. Kit qud so sdnh dnh huong cda dien tich collector den hieu gud sdn sudt nu&c ndng ciia bam nhiit CO tich hap ndng luang mat trai (PA3)

Thong s6 ^ — — ' ~

_^___ DiSn tich collector I ^ ( W / m O

The tich nuac trong thiing chiia (lit) Nhiet do nuac nong trung binh a dau ra ("C) Thai gian lam nuac nong (phut) Nang lu(;mg tieu thu (dien nang) (kWh)

A^ = 1x1 (m') 804 120 60 240 1,88

A = 1x1,2 ' ( m ' )

805 120 60 195 1,6

A^= 1x1,5

° ( m ' ) 802 120 60 185 1,55

NGHIEN CUTU-TRAO Ddl

Bang 5. Kit qud so sdnh dnh huang ciia cuong dp buc xg mat trai den hiiu qud sdn sudt nuac nong cUa bam nhiet c6 tich hpp ndng luang mat tr&i (PAS)

Thong so

Ngay thi nghiem I™(W/m=)

Dien tich collector (m^) The tich nuac trong thimg chiia (lit) Nhiet dp nuac nong trung bmh a dau ra ("C) Thoi gian lam nuac nong (phiit) Nang Iugng tieu thu (dien nang) (kWh)

13/03/15 731

1,2 120 60 210 1,75

12/03/15 805 1,2 120 60 195 1,6

Bdng 6. Ket qud so sdnh dnh huang aia thi tich nuac den hieu qud sdn sudt nuac nong cua bam nhiit co tich hap ndng luang mat trai (PAS)

Thdng so — The tich nu^c

Ngay thi nghiem Dien tich collector A^ (m^) U(W/m^)

Nhiet do nuoc nong trung binh ("C) Thai gian lam nuoc nong (phiit) Nang luang tieu thu (dien nang) (kWh)

He so hieu qua = The tich nuac/Nang lugng tieu thu (lit/kWh) 120 (Ut) 12/03/15 1 x 1 , 2

805 60 195 1,6 75

150 (lit) 18/03/15 1 x 1 , 2

807 60 230 1,85 81,08

180 (Ut) 19/03/15 1x1,2

801 60 280 2,2 81,81 Bang 7. Kit qud so sdnh dnh hu&ng cua dp sudt vd nhiit dp bay hai din hieu qud sdn sudt nu&c nong cua

bam nhiet co tich hap ndng luang mat trai (PAS)

Th6ng so

Ap suSt bay hffi (bar) Ngay thi nghiem

Dien tich collector A^ (m') 1TB (W/m^)

The tich nuoc trong thung chiia (lit) Nhi?t dp nuoc nong trung binh a dau ra (°C) Thoi gian lam nuoc nong (phiit) Nang luang tieu thu (dien nang) (kWh)

P„ = 2 ( b a r ) 09/01/15

1 x 1 , 5 668,4 120

60 210 1,9

P , , = 4 (bar) 14/01/15

1 x l , 5 671 120 60 185 1,5

ISSN 0 8 « - 7056

TAP CHl CO KHi V I £ T NAM, S6 5 nam 2015 www.cokhivietnam.vn

NGHIEN cufu-TRAOOCl

5. BAN LUAN KET QUA 5.1. Nhan xet chung

Hinh 4 va 5 cho thay rang, khi cudng dp hue xa mat trdi tang len thi nhiet do va ap suat bay hai tang len rkt nhanh va khi cudng do buc xa mat trdi giam thi nhiet dp va ap suat bay hai ciing giam theo. Qua dd thiy rSng nhiet dp va ap suat bay hai cua mdi chit trong dan collector phu thudc r^t nhieu vao cudng dp buc xa mat trdi.

Hinh 6, cung chi ra rkng dd dat dugc nhiet do nudc ndng trung binh diiu ra I^ 50 - 60°C thi he sd COPh,^^jIy thuydt khoang 5 - 6 , nhung he sd COPh|.j,.j,j thuc ti ciia he thong hen chi khoang 4 -^ 4,3. Didu nay chung td qua trinh thiet ke chd tao he thdng hen vln chua dat dSn hang thai toi uu nhat, vi cd the do qua hinh chd tao chua tdi uu, sai sd thidt bi do... Tuy nhien, ket qua ciing phan anhdugc phan nao hieu qua sir dung nang lugng ciia he thdng bam nhiet tich hpp nang Iugng mat hdi.

5.2. Anh hutfng cua dien tich collector den hieu qua cua bom nhift tich htfp nang lutfng mat trdi

Tu ket qua thuc nghiem trong bang 4, chiing ta cd the nhan thay khi dien tich collector tang len, thi nang Iugng tieu thu ciing nhu thdi gian Iam ndng nudc cua he thdng bam nhiet tich hgp nang lugng mat hdi se nhd ban de dat dugc Cling dieu kien dau ra. Nguyen nhan cua van de nay la khi dien tich collector tang len thi nhiet Iugng ma mdi chat lanh hap thu dugc tai dan collector ciing se nhieu hon, do dd, ap suat bay hoi ciing se tang Ien nhanh han Iam cho ty sd nen giam xudng, nen cdng cap vao cho may nen Cling se giam theo. Them vao dd, chinh vi nhiet lugng ma mdi chdt lanh hap thu tai dan collector cd dien tich ldn hern ciing se nhieu hon, nen nhiet

Iugng ma nudc nhan dugc do mdi chat nha ra d dan ngung cung se nhieu hon, vi vay, nudc se nhanh ndng han.

Tuy nhien, cung can nhin nhan mdt each khach quan rang, khi dien tich collector tang len thi nhiet dp dau day may nen cung se cao ban, lugng hoi sinh ra hong dan collector ciing se nhieu ban, chinh dieu nay se la nguyen nhan Iam qua tai may nen hoac lam lao hda dau bdi hon tir do gay hu hdng may nen do nhiet dp dau day qua cao. Do do, viec tinh toan lira chpn dien tich collector ciing phai dugc tdi uu, de he thdng van hanh dn dinh.

5.3. Anh hirdng cua cirdng dd birc xa mat trdi din hieu qua ciia btfm nhiet tich hgrp nang lirtfng mat troi

Tuong ty nhu anh hudng cua dien tich collector, ket qua thi nghiem hong bang 5 cung chi ra rang khi cudng dp biic xa mat hdi tang Ien, thi nang lugng tieu thu cho he thdng se it han va thdi gian lam ndng nudc cung se ngan ban. Nguyen nhan cua van de nay ciing dugc giai thich gidng nhu anh hudng ciia dien tich collector.

5.4. Anh hirdng cua the tich nird^c den hieu qua cua btfm nhift tich htfp nang lugtig mat trdi

Ket qua thirc nghiem trong bang 6 chi ra rang, the tich nudc trong thung chiia con- denser cang nhd thi thdi gian Iam ndng nudc de dat dugc cung mdt dieu kien dau ra se cang ngan. Vi cac the tich nudc hen nhan vao mot ngudn nhiet Iugng nhu nhau, nhung neu xet tren tuong quan ve the tich thi ta thay the tich nudc trong thung chua condenser cang nhd thi nhiet lugng ma nudc nhan dugc tren mdt don vi the tich cang nhieu. Chinh vi vay, nudc trong thung chiia condenser cd the tich nhd hon se

nhanh ndng hon. ^

NGHIEN cufu-TRAODOI

Nhm vao bang 6, ta thay rang he sd hieu qua ciia he thdng cd the tich nuac hong thung chua condenser 180 lit la 81,81 (hong khi he sd hieu qua ciia he thdng cd thd tich nudc hong

thung chiia condenser 120 lit chi la 75), do dd he ^ ^ E j LUAN thdng nay boat ddng hieu qua nhSt, vi tan dung

dugc tdi da nang lugng mat hdi.

han, do do cdng cap vao cho may nen theo thdi gianciing se giam dang ke de dat dugc cung dieu kien dau ra.

5.5. Anh huong cua ap sudt va nhiet dfl bay htfi den hieu qua cua btfm nhiet tich hgp nang lutfng mat trdi

Kk qua thi nghiem hong bang 7 cho ta thay rang, khi tang ap suat va nhiet dp bay hoi Ien thi nang Iugng tieu thu cho qua trinh de dat cung dieu kien dau ra cung se it hon. Vi khi tang ap suat bay hai Ien se Iam giam dang ke ti sd nen so vdi khi van hanh d ap suat bay hoi thap Ngay nhan bai: 22/4/2015

Ngay phan bien: 16/5/2015

Tu cac ket qua nghien ciin, cd the thay ring khi tich hgp nang Iugng mat hdi vao hong b a m nhiet, thi hd thdng boat ddng hieu qua hon ca v§ hieu qua su dung nang lugng va thdi gian Iam ndng nudc. Ben canh do, cung cd rat nhieu yeu td anh hudng den hieu qua ciia bam nhiet tich hgp nang Iugng mat hdi nhu dien tich col- lector, cudng dp biic xa mat hdi, the tich nudc, ap suat bay hai...Vi vay, khi nghien cuu va ung dung he thdng vao thuc te can luu y den cac yeu td hen de dat dugc che dp tdi uu cho he thdng.<'

Tai lieu tham khao:

[1]. Nguyen The Bao (2014); Bdo todn vd qudn ly nang lupng.

[2]. Hidetoshi Nakagami, Chiham Murakoshi, and Yumiko Iwafiine "Inlemational Comparison of Household Energy Consumption and Its Indicator" Jyukankyo Research Institute, Japan 2010.

[3]. B. J. Huang And J. P. Chyng "Performance Characteristics Of Integral Type Solar assisted Heat Pump"

Solar Energy Vol. 71, No. 6, pp. 403^14,2001.

[4]. R. G. Morgan "Solar Assisted Heat Pump" Solar Energy Vo\.2S,'>io. 2, pp. 129-135, 1982.

[5].S. Ito, N. Miura And K. Wang "Performance Of A Heat Pump Using Direct Expansion Solar Collectors"

Solar Energy Vol. 65, No. 3, pp. 189-196.

[6]. Le Chi Hi?p (2008); i^dy lgnh hdp thu trong ky thugt dieu hoa khong khi, NXB. Dai hpc Quoc gia TP.

Ho Chi Minh.

[7]. M. Raisul Islam and K. Sumathy "Carbon Dioxide driven Solar-assisted Heat Pump Water Heating System " Intemational Research Joumal of Environment Sciences Vol. 2, pp 77-92, October (2013).

ISSN 0866 - 7056

TAP CHi CO KHi V I £ T NAM, Sd 5 nam 2015 www.cokhivietnam.vn