KHOA H9C CONG NGHE

NEHTEN EUU sAy cA loc rHEo rucuvEru rY sAvBrrM ruurEr xEr HgP vr soNtr

Nguy6n Hayl

mrr,rrfrNghi€n cuu da tidn hanh thr] nghiQm sdy cd l6c theo nguy6n ly sdy born nhiQt kdt hgp vi s6ng. NhiCt d0

sdy hq,p lj cho sdy c6 l6c theo nguydn ly sdy born nhi€t kdt hqp vi s6ng rluo. c x6c tlinh tr€n co sd danh gi6

c6c chi ti6u k! thu4t cira qud trinh sdy nhu thoi gian sdy hay tdc dQ giim dm, chi phi dien ndng ri€ng cho

quA trinh sdy vd chdt luong cria cd 16c sau khi sdy nhu mdu sdc, miri vi, hdm luong dam, d0 mdm cira thitca. Kdt qui tla x6c dinh duo. c nhiQt d0 sdy 45"C ld phri hqp cho sdy cd 16c. Phuong trinh dq doan sg giimdm cfra c6 16c theo thoi gian sdy da ducr. c x6c dinh. Chi phi diQn ndng ri€ng cho qu6 kinh sdy le 3,58

kWh/kg c6, thoi gian sdy 72 gid, tdc tt6 sdy trung binh 3,45y,/h, hdm luo-ng dam cria cil l6c sau khi sdy dat

7,58o/o,th\tcd mdm ddu, cd c6 mui thomr d4c tnmg. Thoi gran sdy rut ngdn ddng kd vd chdt luong cd loc sau

khi sdy cao horr cdc phuong phip lim kh6 ca l6c hi6n dang dugc sit dgng.

Tirkh6a: Cti loc, sdy bom nhigt, ui sdng, tdc d0 sdy.

l. olr uffu oE

C6 l6c khO Id mQt loai thUc phdm rdt dugc ua

chu6ng vd co gi6 tri thuong mai cao. Chdt luqng c6

16c kh6 thuong du-o. c nguoi ti6u dung danh gi6 qua

kich thuoc, mui vi, mdu sic,... fuy nhi6n it ai quan

tAm vd crlng kh6ng c6 didu kiQn dd danh Sid hdm

luong dinh duong trong c616c kh6.

Hi0n nay c616c tlug,c ldm kh6 chri ydu bang c6ch

phoi ning, bang lo sdy thri c6ng ho4c m6y sdy khOng

khi n6ng voi thoi gian phoi, sdy rdt lAu, keo ddi tl6n

vdi ngdy. C6c phuo'ng ph6p ndy ddu ldm giim himluo,ng dinh duo'ng trong sin phdm so voi cd h-toi. Voiphuo'ng ph6p sdy khOng khi n6ng, nhi€t dO sdy thdp

thi thoi gran sdy k6o dii, nhi€t tlQ sdy cao sC lAm mdt

dinh duong fong cd vd dO ldm thit c6 bidn cimg. Voiphuong phdp phoi ning sC tao ra san phdm c6 chdt

luong rdt thdp do sau khi phoi hdt mQt ngiy n6ng

nhtmg cd vin con tucri vd phii cho qua d€m tld h6msau phoi tidp, tlidu ndy tla ldm protein trong cd biph6n hiry, mit kh6c cd bi nhi6m khudn rdt cao do

rudi, con rung, bgi bdn,...

B€n canh d6, do dac thir vd hinh d4ng cira c6(ch6 thit ddy, thit m6ng) ndn c6c phuong phdp phoi,

sdy hiQn nay t4o ra sin phdm c6 kh6 khOng d6ng tl6u

vd dm d6, ndu d0 dm kh6ng dat s€ ldm c6 mau bimdc, ndu d6 dm quA thdp sE ldm thit cd kh6 trd n€n

cimg.

Sdy born nhi6t kdt hgrp vi s6ng c6 rdt nhidu uu

t Trulng Eai hoc NOng Ldm TP. H6 Chi Minh

di6m. Tr€n thd gioi hiQn da c6 mot sd c6ng bd vd sdy

cd bang vi s6ng nhu cdng trinh cria Hosain Darvishivi cdc cQng sg (2013) nghidn cuu vd sdy ci hdi, kdtqui tl6nh gi6 vd chdt luong sin phdm vd thoi gian sdy

tla cho thdy phuonC phep s.dy 'oi s6ng uu viet honhin. Ngodi ra con co citc c6ng trinh nghidn cuu khdc

vd sdy c6 bang vi s6ng cria Yuttapong vd cdng sr1

(2006), Zhen-hua Duan vd c0ng su (2011), Boyo va

cdng su (2013), Mohammad vd cOng su (2015) ... Tuynhi6n img dgng vi s6ng cho sdy cd 16c van chua du-q. c

nghiCn cuu dd 6p dung tai ViQt Nam.

2. PHWNG PHiP Ui PHUI}NC IIFN

- Phuo,ng ph6p tinh todn thidt kd: viec tinh toan

thidt kd mdy sdy bcnn nhiQt kdt hgp vi s6ng du<rc

thuc hien dqa tren cdLc tinh chdt nhi€t, tinh chdt vat $cira cd l6c, $ thuydt tinh toan vd truydn nhi6t, truydndm vd l1i thuydt sdy born nhi€t (lrdn Van Phu, 2002).

- Phuong phdp chd t4o: m6y duqa chd tao tlon

chidc theo trmg h9 chi tidt vd cum chi ti6t rlidn hinh.Mqt sd chi tidt ti€u chudn duo. c tinh todn vd chqn

mua trOn thi truo,ng.

- V0t lieu sdy: cd l6c c6 khdi luo'ng 0,7 kg/con.Cd duo. c danh viy, md ldy hdt ndi tang, cit b6 dAu,

du6i sau d6 dem r[ra sach. X6 c6 theo chidu dqc

xuong sdng, b6 xuong. NgAm c6 vdo nudc mudi c6

ndng dQ 10% trong thoi gian 30 phtt, sau d6 nia sach

vd bit tlAu sdy. A* hO cd ban dilt72o/o,dm tlq y€u cAu

sau khi sdy 30 t 1%.

- A- AO ciua cA duo. c xAc dinh bing phuo,ng ph6p

tu sdy t?i 105"C, sdy cho tldn khi khdi luons c6 kh6ng

NONG NGHTEp vA pHAr TRIdN NONe THON - rV t - THANG 6/2ots 69

KHOA HOC CONO NOHE

thay tl6i. Cdc sd lieu thi nghi€m duqc xtt ly thdng kcbing phuong ph6p sai kh6c nh6 nhdt c6 ;f nghia(Least Signiflcant Difference - ISD),

- Dd tl6nh Sid hiQu qui khi sdy c6 l6c theo

nguy€n ly sdy born nhiet kdt hqp vi s6ng, c6l6c du-o. c

sdy ddi chimg theo nguy6n ly sdy kh6ng khi n6ng,

sdy born nhiet vd phoi ning. Cdc chi ti€u danh gi6 ld

thoi gian sdy, chdt luong c6 khd sau khi sdy nhu mdu

sic, mui vi vd dinh ducmg. Hdm luqng dinh duong

cira c;l tluo. c ki6m tlinh theo TC\N 8134:2009.

s. [tT QUA NGHtiN cliu

3.1. Kdt quA tinh toan thi6t kd vd chd tao

Nguydn hi cdu tao m6y sdy c616c theo nguydn lysdy bom nhiet kdt hqp vi song duoc trinh bAy tr6n

hinh 1.

Hinh 1. So tld cdu @o mAy sdy cd l6c theo nguy€n $sdy born nhiet kdt ha'P vi s6ng

1. Dan ng.mg tU chinh; 2. Ddn bay hoi; 3. Mdynin; 4. K€nh din tiic nhAn siy; 5. DAn ngung tu phu;

6. DAu phdt ui sdng; 7. Ti di€n didu khidn; B. D1nS

co quay khung treo cd; 9. C;i ldc; 10. I{hung treo cii;

11. Budng siy; 12. Htang di tiic nhan sfit l?.Cinhhrdng ddng tiic nhan sdy.

Nguy6n hf ldm vi€c: cd 16c sau khi xit l1f du-o. c

cung cdp vdo budng sdy (11) vi m6c 16n khung treo(10). T6c nhan sdy du-o. c qu4t htt thdi vAo budng sdy

(11), tl6 ca nhAn s6ng ddu hon nhcr d0ng co quay (8),'

b0 vi s6ng (6) c6 t6c dung gia nhiQt vAt liQu tldn nhiQt

d0 sdy. T6c nhan sdy khi da qua budng sdy iluo. c hdi

luu hodn todn qua k6nh dAn tac nhan sdy (a) vd trdvd ddn bay hoi (D cnabO born nhi6t dd thsc hiQn qu6

trinh tach dm. Sau khi qua ddn bay hoi, tac nhan tidp

tuc di vdLo ddn ngtmg tq (1) cira bcvrn nhiet, tai dAy tac

nhan sdy duoc gia nhi€t them vd tlQ dm cira tac nhAn

sdy giAm manh. Sau khi qua b0 bcvrn nhi6t, tilc nhAn

sdy duoc quat thdi vdo budng sdy vd lap lai chu trinhkdn.

Tr6n co sd nang sudt, nhiet d0 sdy, tlec tinh ce

16c,... kdt qui tinh to6n thidt k6 da xdc tlinh duos c6c

th6ng sd cria m6y sdy c616c nhu sau:

- Ning sudtmo hinh: 3 ks/mb.

- Nhiet d0 tac nhan sdy theo thidt kd ld 50"C ve

c6 thd didu chinh, gi6m s6t tu dOng.

- Budng sdy c6 kich thuoc: ddi x r6ng x cao = 500

x 500 x 600 mm.

- Ltru luong tac nhAn sdy cdn thidt 0,006 m3ls.

- Nhiet luong cdn thi6t ldm n6ng c6 ddn nhiet do

sdy ld 211 lrJ. COns sudt vi s6ng theo tinh toan ld 870

W v0y chqn ddu phitvi s6ng phd th6ng c6 cdng sudt

900 W tAn sd 2.450 MHz.

- Sd vdng quay cria khung treo c6 ld 5

vong/phut. C6ng sudt dOng co kuydn dOng 50 W.

- Nhiet lugng cung cdp cho qu6 trinh sdy tld bay

hoi 1 kg dm h 3.400 kJlkg dm,

- Tdng trd luc cria todn b0 he thdng sdy bao gdm

duo,ng dng, ddn n$mg tu, dan bay hoi, budng sdy,...

ld 1.843 Pa.

- Quat sdy ld quat ly t6m, cdng sudt dQng co cria

quat1./4HP.

Hinh 2. M6y sdy c616c theo nguy6n V sdyborn nhiQt

k6t hqp vi s6ng

Tu cdc kdt qui tinh toan thidt kd, m6y sdy c616c

theo nguydn lf sdy bom nhiQt kdt hqp vi s6ng duo. c

chd tao hoan chinh nhuhinh 2.

3.2. Kdt qui sdy thtr nghi6. m

Dd so s6nh hi6u qui cira sdy c616c theo nguydn

ly sdy born nhiet kdt hsp vi s6ng so voi phuong phdp

70 NONo NGHtEp vA pnAr TRIdN ruOrue THON - rV t - THANG 6l2ot5

KHOA HgC CONG NOHi

sdy born nhi6t. C6c thi nghiCm duo. c thuc hi6n voi cA

2 phuong ph6p tai 3 muc nhi€t d0 tac nhAn sdy ld40"C, 45"C vd 50'C nhim xdc dinh nhi6t tlg sdy phuhgp tr6n co sd danh giir citc chi ti€u kl thuat cria qud

trinh sdy nhu thoi gian sdy hay tdc d6 giim dm vd

chdt luo,ng ci l6c sau khi sdy. M6i thi nghiOm tluoclap lai 3ldn vd tinh gi6 tri trung binh.

Kdt quA so sdnh dm tl6 c616c theo thoi gian sdy

cira hai phuong ph6p tA nhi€t dO sdy 40'C dunc trinhbdy trong bang 1.

Bang 1. So sanh dm d0 cria cii l6c bing phuong phdp sdy bom nhi6J so voi sdy born nhiet kdt hqp vi s6ng taitdc nhtn sdv 40"C

Phuong ph6p sdy tai nhi€td0 tdc nhan sdy 40'C

Thoi sian sdv (h)

0 2 4 6 8 10 72 t4 16 77

Sdv born nhi6t 72.0 66.4 60.3 53,6 47,5 41,7 36,2 32,4 30,2 29,3

Sdv born nhi6t - vi s6ns 72,0 62.8 55.4 48.9 42,4 37.4 33,5 37.2

.;gBiiur irluc;l 'JitciC

:* F,u0r rJu4t + \'i ;mrg -l(loc

ti{) :

-t, .

60:-€:'+ll

''Sr+1t.t Ii,10 l

t*llL) i

(l:() 2 I 6 S t(i 12 l..l 16

i

Thot glarr si;- ltrt

Hinh 3. Bidu ttd Ciam drn ctla chl6c theo thoi gian talnhiQt d0 tac nhAn sdy 40"C

Tai nhi6t tl6 t6c nhan sdy 40"C, khi sdy theophuong ph6p sdy born nhiQt, c6loc voi dm d0 ban

ddu 72/o se dat d0 kh6 theo y6u cdu sau 14 gid sdy.

Khi c6 sU h6 trq ctia vi s6ng trong qud trinh sdy, thoi

gian sdy Id 14 gio. Nhu vAy, khi c6 su h5 tug cria vis6ng, thoi gian sdy ala rut ng6n duoc 3 gio.

Tdc tlQ sdy trung binh ctra phuo,ng phdp sdy bomnhiOt ld 2,So/ofh, khi sdy born nhi6t kdt hgp vi s6ng ld2,8%o/h.

Ddnh gi6 cim quan vd mdu sic vd mui vi kh6ngthdy sLr kh6c bi6t. Ci l6c sau khi sdy c6 miri thorndac tnmg ctn ci kh6, thit c6 mdm tl6u. Chi phi dienning ri€ng cho qu6 trinh sdy le 3,31 kWh/kg. Hdmluong dam (rdm luong nito tdng) cfia c6 sau khi sdy

bang phucrrC phep sdy born nhiet kdt hsp vi s6ng dat7,90Y0.

Tidn hdnh tuo,ng tu t4i muc nhiet tl6 sdy 45"C,

kdt quA so s6nh dm d0 cd 16c theo thoi gian sdy cirahai phuong phdp tai nhi6t tlQ sdy 45"C du-o. c trinh bdykong bAng 2.

Bang 2. So sanh dm d0 ctrucil6c bing phuong phfp sdy bom nhiQt so voi sdy born nhigt kdt ha'p vi s6ng t4itac nhdn sdv 45oC

Phuo,ng ph6p sdy tai nhiet d0

tac nhan sdv 45"C

Thoi sian sdv ft)0 2 4 6 8 10 t2 74 15

Sdv bcrm nhi6t 72.0 63,6 56,9 50,8 45.7 39.5 34,3 31,0 29.8

Sdv born nhi6t - vi s6ns 72,0 60,1 51,6 45,2 39,6 34,2 30,6

$0

:('|

;rt;Rrrrri r{riif J Sti('

Hinh 4. Bi6u dd giam drn ci.acil6c theo thoi gian teinhiQt tlQ tac nhin sdy 45"C

Tai nhi6t d0 tac nhan sdy 45"C, khi sdy theophuong phdp sdy b<yrn nhi€t, thoi gian sdy ld 15 gio.

Ktri c6 su h6 tro cria vi s6ng trong qud trinh sdy, thoigian sdy li 12 gio. Nhu vAy, khi c6 su h6 tuo cria vis6ng, thoi gian sdy da rut ng6n tumg tu nhu tai nhi6td0 40'C ld ducr. c 3 gicr.

Tdc tlQ sdy trung binh ctra phuong phdp sdy bornnhi€t ld 2,8o/o/h, khi sdy born nhi€t kdt hqp vi s6ng ld

3,5o/o/h. Chi phi dien nang ri6ng cho qu6 trinh sdy ld

3,58 klMh/kg.

Hdm luqng dam cria cd sau khi sdy bing phuongph6p sdy born nhi6t dat7,580/0, thdp hon 0,32% so voi

60

tU

Elo

:io

2(1

l0t)

Rt$r ldriit r. \r.i sols .t-iot-,'

6 ll I(r'l'IrM ctin.csy (h)

NONG NGHTEp vA pnAr rnrdru NONG THON - rV t - THANG 6/2ors 71

KHOA HOC CONO NOHE

Ddnh gid cim quan vd mdu sdc vd miri vi khdngthdy su kh6c biet. C6 16c sau khi sdy c6 miri thorntl6c brmg cl,uacikhO, thit c6 mdm tldu.

Kdt qu6 so s6nh dm tlO cd 16c theo thoi gian sdy

cira hai phumg ph6p tai nhiet d0 sdy 50"C duo. c trinhbdy trong bane 3.

Bang 3. So sanh dm dO cia chl6c bing phuong ph6p sdy bom nhiQt so voi sdy born nhicj kdt hqp vi s6ng t4ihic nhAn sdv 50"C

Phuong phdp sdy tai nhi€t tlq tacnhAn sdv 50"C

Thoi sian sdv ft)0 2 4 6 B 10 12 13

Sdv bom nhiOt 72.0 63.4 55.3 46.3 40,6 35.7 31^6 30,8

Sdv bom nhi€t - vi s6ns 72,0 57,4 47,2 40,5 34,2 30,0

.,.*Bcrn rJ.riat .r{.}$r:l

- rrr-.Br:rlr dri,it + Yi sotg ]0rrt,l

tluoa trinh biy trong bang 4 vi bidu diCn bidu dd

tr6n hinh 6.

Bang 4. So sanh tdc tlQ ciarn dm (%/h) cira hairhuons ohio sdv tai cic muc

Phuong ph6p sdyNhi€t tt6 sdv

400c 45"C 50"c

Bcrm nhi6t 2,5 2,8 3.1

Bom nhi6t - vi s6ns 2,8' 3,5 b 4.2'

0 I .{ 6 8 l{.1

Thit slrn *1]'tht

khdc nhau: khiic bi€t

tai muc nhi6t d0 sdy 40"C. Tuy nhi€n, su kh6c bigtndy kh6ng c6 f nghia vd mat thdng kC & muc f nghia

0,05, hay n6i cdch khdc ld kh6ng c6 sukhdc nhau vd

hdm luqng dam cira c6l6c khi sdy tai nhi6t dd 40"C

vi 45"C.

Hinh 5. Bidu dd giam dm ctnc{,l6c theo thoi gian tainhiQt d0 tac nhAn sdy 50"C

Tai nhiet dO t6c nhan sdy 50'C, khi sdy theophuong ph6p sdy botn nhict, thoi gian sdy ld 13 gio.

IGri c6 su h5 trq cira vi s6ng trong qu6 trinh sdy, thoigian sdy ld 10 gio. Nhu vAy, khi c6 su h6 trq cita vis6ng, thoi gian sdy tla rut ngdn ducr. c 3 gio.

Tdc d0 sdy trung binh cria phuong ph6p sdy bo,rn

nhiet ld 3,1o/o/h, khi sdy bcrn nhiQt kdt hqp vi s6ng ld

4,2y"/h. Chi phi di6n nang ri6ng cho qu6 trinh sdy ld

4,47 kWh/kg. Hdm luong tl4m cira cd sau khi sdy

bang phuons phAp sdy born nhi6t kdt hsp vi s6ng ld

5,23o/o, giNnm4nh so voi tAl muc nhi€t tlQ sdy 45'C vd

su sai kh6c ndy c6 1i nghia vd mdt thdng kC o muc 1;i

nghia 0,05.

D6nh gi6 cim quan vd mdu sic vd mrii vi kh6ngthdy sg khdc bi€t. Cd 16c sau khi sdy c6 mii thorn

rl4c trmg cl8'a ci kh6. Tuy nhi6n, thit cd cimg hcvn taimuc nhiQt d0 sdy 40"C vd 45"C, d{c bi6t le tai phAn

du6i cd.

Kdt quA so sdnh tdc d0 sdy trung binh cria

phuong ph6p sdy born nhiQt vd sdy born nhi€t kdt

hsp vi s6ng tai 3 muc nhi6t d0 sdy 40oC, 45"C vd 50"C

Oic giti fri cd ky hi€u chftcd y nghla fmuc y nghta 0,05.

i-^^--*---*-- ---^-----N 31ii"6di;i os

' ,: ":fJ*"

E3 *-Ma. - --G 4.> Mffia ffi

.E", .W Mi 40DL: 45dc

I

I

13 i

I

thi4t ...r.

nhiCt+vi ffi

-W***

!flnC

Hinh 6. So sanh tdc tlQ sdy trung binh ctra phuong

phdp sdy born nhiQt vd sdy born nhiet k6t ha'p vi s6ng

& 3 muc nhigt d0 voi c6l6c

C6c sd li6u so srlnh vd thoi gian sdy hay tdc d6

giim dm, chi phi diQn nang ri6ng cho qud trinh sdy,

, hem lug,ng dam ci,a ci sau khi sdy (ngoai tru tai hai

muc nhiQt dO 40"C vi 45"C) duo. c xri ti thdng ke da

cho thdy c6 sr,t khdc biCt 0 muc y nghia 0,05. Tu cdc

kdt qui ndy, cin cu vAo thoi gian say, chi phi di6n

nlng ri6ng cho qu6 trinh sdy, chdt luo-ng cd sau khisdy c6 thd kdt 1u0n tai muc nhiet d0 sdy 45"C ld phu

hqp cho sdy c6 l6c theo nguy6n V sdy born nhi€t kdthgp vi s6ng.

72)

NoNG NCHTFP VA PHAT TRIEN NONG THON - KY I - THANG 6/2015

KHOA HOC CONC NGHE

Dd so silnh chdt luong dinh duong cin c616c voic6c phuong ph6p sdy khic nhau, tidn hdnh thucnghiem so sdnh voi miu cd dugc sdy bans phuo'ng

ph6p sdy kh6ng khi n6ng vd miu cd mua tr€n thitruong. Kdt quA xet nghi€m hdm luong dam crja c6

l6c duo. c trinh bdy trong bang 5.

Bang 5. Kdt qu6 x6t mdu him luqng d?m cua c6l6cnito

TT [-oai m6uHdm luqng nitcr

tdns (7n)

1 Miu cd hroi 8,14^

2Miu c6 sdy born nhi6tkdt hoo vi s6ns

7,58 b

J MAu c6 sdy bcnn nhiQt 6,88'

4M6u c6 sdy khOng khin6ns

5,49 d

5M6u c6 khO mua tr6nthi truons

3,47.

Ciic S:iti W cd W hi€u chft khic nhau: khilc biQtcd /nghia 6mftclnghla Q05.| -- -

I

l^i

:oNN$SM; .E s $Hlffi xN, Rw7;,i ffiffi ffi ffi ffi$ffi,E., ffi N ffi W;; ffi W ffi ffi Wi-: W N ffi#$ W ffiM6il tudi tvlSu s5y U5u s5y Mau gAy MAu ei kh6

tlqm nhi+t + trom nhia kh6ng khi thi tru6ngvi song nong

Hinh 7. Bidu dd so s6nh hdm luqng nito tdng tongchl6c

Kdt qui khio nghiem vd xet mAu da cho thdyhdm luong nito tdng cira mAu sdy bo,rn nhiCt kdt harp

vi s6ng ld cao hon so voi c6c phuong ph6p cdn lai (p< 0,05). Danh Si6 vd m4t cAm quan thi san phdm sdybom nhi6t kdt hgp vi s6ng c6 mdu sic hdp dAn, giuduoc mui vi ddc tnmg cin cd.

Kdt qui xAy d1mg phucrrg trinh du dodn sg giim.dm W(%.) theo thoi gian sdy t(h) trong qud trinh sdy

cdc 16c theo nguy6n l1i sdy bom nhi6t kdt hqp vi s6ngnhu sau:

W'= 71,4595 - 5,1821.t + 0,747 6.t2 ; (ff = 0,994).

4. [tT !.U[N

TrOn co s& muc rlich nghiCn cuu vd tlac tinh cirach loc, md hinh mdy sdy ci l6c theo nguy6n ti say

bcnn nhi6t kdt hq'p vi s6ng da duqc tinh toan thidt kdvi chd tao.

Cdc thi nghiQm da tlug'c thuc hi6n nham xdctlinh nhiet tlQ sdy hqp ly cho sdy c6 l6c tr6n co s&

tlanh gid c6c chi ti0u trry thuat cira qu6 trinh sdy nhuthoi gian sdy hay tdc tlO Ciam dm, chi phi diqn nangri6ng cho qu6 kinh sdy vd chdt luong cira c616c sau

khi sdy nhu mdu sdc, mui vi, hdm luong dam, dd

mdm cira thit cd. Kdt qui da xdc ilinh duo. c nhiet d0

sdy 45"C ld phu hgp cho sdy ci l6c theo nguy€n l1i

sdy born nhiet kdt hgp vi s6ng.

Kdt qui tlo tlac vd xrl llii sd lieu da xdc dinh duocmuc ti6u thq dien nlng ri6ng cho qu6 trinh sdy ld3,58 kWh/kg c6, thoi gian sdy 72 gid, tdc d0 sdy

trung binh 3,45o/o/h, hdm luong dam cria c6 16c sau

khi sdy d4t 7,58o/0, thit c6 mdm ddu, c6 c6 miri thorndac mmg. Thoi gian sdy tluo. c rut ngdn dang kd vichdt luong c6 sau khi sdy hon han c6c phunng ph6p

ldm kh6 cd l6c hi6n clang sir dung nhu sdy born nhiQt,

sdy kh6ng khi n6ng vd phuong ph6p phoi ningthuong dirng.

riruEu THAM tffiAo

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NONG NGHtEp vA pnAr TRtdN NONG THON - rY r - THANG 6/2ots t)

KHOA HOC CONO NOHE

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472-476.

STTIDY ON COMBINING HEAT PUMP A}.ID MICROWAVE FOR SNAIGHEAD FISH DRYING

Nguyen Hay

Summary

The study was performed to combine heat pump and microwave for snakehead fish dryrng. The suitable

drying temperature for snakehead fish drying was determined base on the basis of evaluation of technical

criteria such as drying time or drying rate, specific energy consumption for the dryrng process and the

quality of snakehead fish after drying as color, flavor, protein, fish meat tenderness. The result have

identified the suitable drying temperature for snakehead fish drying is 45"C. The predicted equation for

moishrre content of snakehead fish versus dryrng time in the drying process was determined. The specific

energy consumption for the dryrng process of 3.58 kl[h/kg of fish, drying time of 12 hours, the average

drying rate of 3.45Yo/h, protein content of dried snakehead fish of 7.58%, meal of fish is soft and have

excellent aroma. The drying time reduced considerably and quality of dried snakehead fish are higher than

the current methods.

Keywords: Snakehead frsh, heatpump dryins, microwave, drying rate.

Nguoi phan biQn: GS.TSKII. Pham Van lansNgdy nh4n bin:%/5/20t5Ngiy th6ng qua phi.n biil.n:25/5/2075Nsiy duygt dens: 0l / 6 / 2015

74 NONG NGHTEp vA pHAr TildN NONG THON - rV t - THANe 612015