Ch Chieusang

nh sng ch l mt phn ca rt nhiu loi sng in t bay trong khng gian. Nhng loi sng ny c c tn sut v chiu di, hai gi tr ny gip phn bit nh sng vi nhng dng nng lng khc trn quang ph in t. 1. L thuyt c bn v nh sng nh sng c pht ra t vt th l do nhng hin tng sau: Nng sng. Phng in. Pht quang in. Pht sng quang in

Lumen: n v ca quang thng; thng lng c pht ra trong phm vi mt n v gc cht rn bi mt ngun im vi cng sng u nhau l mt Candela. Mt lux l mt lumen trn mi mt vung. 2. Cc khi nim v thut ng thng dng Hiu sut ti lp t: y l chiu sng duy tr trung bnh c cung cp trn mt mt phng lm vic ngang trn mi Ot cng sut vi chiu sng ni tht chung c th hin bng lux/W/m.

H s hiu sut ti lp t: y l t s ca hiu sut ti mc tiu v ti lp t. 2. Cc khi nim v thut ng thng dng Ngun pht sng: B n l mt n v pht sng hon chnh, bao gm mt hoc nhiu n cng vi cc b phn c thit k phn phi nh sng, nh v v bo v n, v ni n vi ngun in.

Lux: y l n v o theo h mt cho chiu sng ca mt b mt. chiu sng duy tr trung bnh l cc mc lux trung bnh o c ti cc im khc nhau ca mt khu vc xc nh. Mt lux bng mt lumen trn mi mt vung. 2. Cc khi nim v thut ng thng dng cao lp t: cao ca vt hay n so vi mt phng lm vic.

Hiu sut pht sng danh ngha: T s gia cng sut lumen danh ngha ca n v tiu th in danh ngha, c th hin bng lumen trn ot 2. Cc khi nim v thut ng thng dng Ch s phng: y l mt h s thit lp quan h gia cc kch thc d kin ca c cn phng v cao gia b mt lm vic v b mt ca c.

Hiu sut ti mc tiu: Gi tr ca hiu sut ti lp t c xem l c th t c vi hiu sut cao nht, c th hin bng lux/W/m. 2. Cc khi nim v thut ng thng dng H s s dng (UF): y l t l ca quang thng do n pht ra ti mt phng lm vic. y l n v o th hin tnh hiu qu ca s phi hp chiu sng.

Quang thng v cng sng: n v quc t ca cng sng I l Candela (cd). Mt lumen bng quang thng chiu sng trn mi mt vung (m2) ca mt hnh cu c bn knh mt mt (1m) khi mt ngun nh sng ng hng 1 Candela (ngun pht ra bc x u nhau ti mi hng) c v tr ti tm ca hnh cu. vy quang thng do mt ngun nh sng ng hng c cng I s c tnh theo cng thc: Quang thng (lm) = 4 cng sng(cd)2. Cc khi nim v thut ng thng dng

3.1 n si t (GLS):c imHiu sut 12 lumen/Ot Ch s hon mu 1A Nhit mu m (2.500K 2.700K)Tui th ca n 1 2.000 gi 3. CC LOI H THNG CHIU SNG

3.2 n Halogen-Vonfam: n halogen l mt loi n nng si t. c im Hiu sut 18 lumen/Ot Ch s hon mu 1A Nhit mu m (3.000K- 3.200K) Tui th ca n 2 4.000 gi 3. CC LOI H THNG CHIU SNG

3.2 n Halogen-Vonfam: n halogen l mt loi n nng si t. Nhc im Gi cao hn Nhiu tia hng ngoi hn Nhiu tia cc tm hn Kh cm gi u im Gn hn Tui th di hn Sng hn nh sng trng hn (nhit mu cao hn) 3. CC LOI H THNG CHIU SNG

3.3 n hunh quang: n hunh quang c hiu sut ln hn n si t tiu chun t 3 n 5 ln v c tui th t 10 n 20 ln. 3. CC LOI H THNG CHIU SNG

4.1 Lng nh sng cn thit: Mi cng vic u yu cu mc chiu sng nht nh ln b mt c th. m bo chiu sng tt l iu cn thit thc hin cc cng vic cn chiu sng. 4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Quy trnh thit k chiu sng tng bc c minh ha pha di c km theo v d. Hnh sau nu cc thng s ca mt khng gian thng gp. 4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 1: Quyt nh mc chiu sng cn thit ln b mt lm vic, loi n v ngun pht sng: Phi tin hnh nh gi s b v loi chiu sng cn thit, thng th quyt nh c a ra da trn tnh kinh t v tnh thm m. i vi cc cng vic vn phng bnh thng cn mc chiu sng 200 lux. i vi khng gian vn phng s dng iu ha, chng ta nn chn n tup hunh quang 36W b i. 4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 2: Thu thp s liu phng theo mu di y: 4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 3: Tnh ch s o phng: 4. Thit k h thng chiu sng = 10 X 10 / [2 *(10 + 10)] = 2,5

4.2 Thit k chiu sng ni tht:Bc 4: Tnh h s s dng: H s s dng c nh ngha nh l t l phn trm ca lumen n trn pht ra ngun sng v truyn n b mt lm vic. Nh sn xut s cp cho mi b n mt bng CU ring ly t bo co th nghim trc quang.4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 5: Tnh s mi lp cn thit bng cch p dng cng thc sau: Trong : N = S mi lp E = Mc lux cn thit ln b mt lm vic A = Din tch (L x W) F = Tng lng dng (lumen) ca tt c cc n trong mt mi lp

4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 5: Tnh s mi lp cn thit bng cch p dng cng thc sau: UF = H s s dng ly t bng i vi mi lp LLF = H s tht thot nh sng. H s ny tnh hao mn theo thi gian ca lng nh sng pht ra t n v lng bi tch t trn mi lp v trn tng nh. 4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 5: Tnh s mi lp cn thit bng cch p dng cng thc sau: LLF = Lumen n MF x Ngun sng MF x B mt cn phng MF4. Thit k h thng chiu sng

4.2 Thit k chiu sng ni tht:Bc 6: B tr cc b n m bo tnh ng u:4. Thit k h thng chiu sng

Thit k chiu sng cho ca hng bn in thoi di ng din tch 10mx10m.V D P DNGV D P DNG 1V D P DNG 2 Thit k chiu sng cho phn xng c kh c chiu rng 20m, chiu di 50m, chiu cao 4.5m, cao b mt lm vic 0.8m v b phn x l 751.

V D P DNG 3 Thit k chiu sng cho phn xng dt c chiu rng 24m, chiu di 42m, chiu cao 5.85m, cao b mt lm vic 0.8m v b phn x l 753.V D P DNG 4 Thit k chiu sng cho phn xng c chiu rng 30m, chiu di 60m, chiu cao 4.8m, cao b mt lm vic 0.8m v b phn x l 873.

y l bi ton thit k chiu sng dn dng, khng i hi chnh xc v ri nn thit k theo sut ph ti chiu sng.GII V D 1 Chn sut chiu sng: P0 = 30W/m2 . Tng cng sut chiu sng cn cp cho ca hng:Pcs = P0.S = 30x100 = 3000 W Chn n tuyp 1m2, 40W. S n l:N= 3000/40 =75 bng B tr n:Chia lm 5 dy, mi dy 5 cm, mi cm 3 bng

y l bi ton thit k chiu sng cng nghip, i hi chnh xc v ri ti b mt lm vic nn thng thit k chiu sng theo phng php quang thng tng.GII V D 41. Kch thc:2. H s phn x:(B phn x: 873)

3. ri yu cu:4. H chiu sng: Chung u5. Chn khong nhit mu:6. Chn bng n:

7. Chn b n:8. Chiu cao treo n:9. Cc thng s k thut ca nh sng: Ch s a im:M hiu: RI-GT grille dfilementCp b n: DHiu sut: 0.61DS n/1 b: 2Quang thng/1 b: 5000 lmCng sut/1 b: 72WLdocmax : 1.4httLngangmax: 1.75htt

T s treo n: H s c ch: H s s dng: H s b:Chn d = 1.25 Tra bng vi b n cp D, t s treo j=0, b phn x 873, ta c h s c ch l: ud = 1.2

BNG TM TT CC THNG S

10. Quang thng tng:11. S b n:12. Kim tra sai s quang thng:Chn s b n: 300 b.Sai s quang thng trong gii hn cho php.

13. Kim tra ri trung bnh trn mt bng lm vic: Thi im ban u: Sau mt nm lm vic:14. Phn b cc b n: B tr 20 dy n, mi dy 15 b n. n = 20, m =15, Nbd =20x15=300. Khong cch gia dy ngoi cng v tng bng khong cch gia cc dy n.

Kim tra cc khong cch phn b n: Tha mn yu cu v khong cch gia cc b n.

***********************************

Documents

Ch Chieusang