ȯ ý ð

ȫ*

߿ȭ ǰ ִ ȭ ȯ ȿ ð ִ ο ȯ ޹ ߿ ̿ϰ ȯ ġ ν ޹ Ŀ ð Ư Ͽ. μ, ٴڿ õ ð ϴ ޹ ð Ǿ.

I.

ȭ ȯ ȯ(TDX, Time Division Exchange) Ȥ No 1A (Number 1A) ȯ ġǾ ȭ ۼ ȯ Ѵ. ó ȭ, ȭ ̵ ȭ ȭ ٷ Կ ȯ ȯ ϰ, ȯ Ǿ. ̿ ȯκ Ǵ ȯ ߿е . ȯ⸦ Ͽ ſ ߿е ȯ 1m2 100W, ȯ 300~600W/m2 ̸, ISDN(Integrated Ser-vices Digital Network) ȯ Ŀ 600~1000W/m2 ̸ ϰ ִ. ̿ ȯ ߿ ִ ȯ ðϱ dz ð ޹(, ޱ )ǰ ߿ȭ ǰ ִ ߿ ȯ ð óϱ ȿ ޹ ߿ 䱸ǰ ִ.

ȯ ð ָ dz ȯ ںǰ ðŰ ̴. µ ſ Ư ںǰ ִµ 75 ̸ ںǰ µ ̷ ִµ ʰϸ ߻ϹǷ ںǰ µ ִµ Ѿ Ѵ. ȯ ޹ ȯ ںǰ µ ִµ ִ Ű ޹ ̾ Ѵ. Nakao ȯ ޹ Ŀ ȯ ð Ư ϸ Ư ޹ Ŀ ð ȯ ߿е(heat removal capacity) Ѱ谡 ٸ ִ. ̷ ȯ ð ȯ ޹ Ŀ ް ִ. , ȯ ޹ μ ѱŻ ޹ (horizontal air supply and return flow system) ޹ ð ȯ ߿е 400W/m2 ˷ ִ. ̷ ޹ ߿ȭ ǰ ִ ȯ ð ޹ ̴. ׷Ƿ äϰ ִ ޹ ĺ ȿ ο ޹ ʿϴ.

޹ , ׸ ȯǿ ϸ ð ȿ ǴܵǴ ο ޹ , ٴڱޱ õ õޱ ٴڹ Ͽ ȯ ޹ , ӵ , µ , üտµ ִµ ޹ Ŀ ð Ư ġ ̿Ͽ Ͽ ޹ ĺ ð Ͽ. ̷ ߿ ȯ ο ޹ ڷν ̿ ̴.

II. ȯ

(׸ 1) ȭ翡 ȸ 500~1,000ȸ ȭ Ǵ ȯ μ ä ޹ ġ ̴. ü ũ (׸ 1) ǥ Ͽ, 2.4m(, x )3.0m(, y )6.0m(, z )̸ x=0m, x=2.4m, y=0m, y=3.0m z=0m, z=6.0m , ٴ õ ִ. , ٴ õ ܿǾ ִ. z=0m ð ӵ z dz ޱǴ 0.9m(, x )0.9m(, y ) ũ ޱⱸ(inlet) dz Ǵ 0.9m(, x )0.9m(, y ) ũ (outlet) ġǾ ִ. z=0m κ z 2m ġ 1.2m(, x )1.8m(, y )1.0m(, z )ũ ȯ ȯ A(cabinet A), ȯ B(cabinet B) ȯ C(cabinet C) ġǾ ִ. ϳ ȯ ȯ ο Ϻθ ϰ ö dz(panel) ȯ ̽ · ѷ ο ִ. ö dz ߿ x=1.2m ִ 1.8m(, y )1.0m(, z ) dz dz 70% ִ Ÿ(punching plate) · Ǿ ִ. dz ð Ÿ Ȥ ȯ Ϻθ ȯ η ԵǾ ȯ θ ðϸ鼭 , ȯ θ ȴ. ϳ ȯ ο z 0.2m 0.9m(, x )1.2m(, y )0.02m(, z )ũ ڱ(PCB: Printed Circuit Board) 4 žǾ ִ. ȯ 12 ڱ z= 2.2m, 2.4m, 2.6m, 2.8m, 3.2m, 3.4m, 3.6m, 3.8m, 4.2m, 4.4m. 4.6m 4.8m ġ ġǾ ִ. ϳ ڱǻ󿡴 x=1.4m, 1.7m 2.0m ġ ġ y=0.6m, 0.9m 1.2m , 9 ںǰ(component) Ǿ ִ. ϳ ںǰ ũ 0.21m(, x )0.21m(, y )0.05m(, z )̸ ϳ ںǰ ߿, Qc 45~ 55W ߿ ´. ϳ ڱǻ󿡴 9 ߿ ںǰ Ǿ Ƿ 9 ںǰ ߿ ߿, ڱ ߿ QPCB 405~495W Ǹ, ڱ ߿е q? PCB 180~220W/m2 ȴ. ڱ ðϱ 0.9m(, x )0.9m(, y ) ũ ޱⱸ dz Vin =146m3/min ð Tin=18 µ z ӵ dz ޱǴ ġ Ͽ. ڱ ߿е q? PCB ޱⱸ dz Vin ޱⱸ µ Tin ȯǿ Ǵ ̴.

߿ȭ ǰ ִ ȯǿ Ͽ ޹ ĺ ð ȿ ο ޹ μ ٴڱޱ õ Ȥ õޱ ٴڹ Ŀ ܰ迡 ִ. ̿ Ȳ Ͽ ȯǿ ٴڱޱ õ İ õޱ ٴڹ Ÿ ð Ư ޹ ð Ư Ͽ ν ߿ ȯ ޹ ְ Ѵ. ȯǿ ϰ ð ȿ ǴܵǴ ٴڱޱ õ İ õޱ ٴڹ ߰ Ǿ, ̿ (׸ 2) (׸ 3) Ÿ. ׸ Ÿ ޹ ü ũ, ȯ ũ (׸ 1) ٿ ϳ ޱⱸ ġ ޶ ð ޶. (׸ 2) Ÿ ٴڱޱ õ 𵨿 ȯ 12 ڱ ġ Ʒ ٴڿ 12 ޱⱸ ġ ð ߿ ںǰ ڱǿ ٴκ Խ ð ȿ ̰ Ͽ. ޱⱸ 1(inlet 1)~ޱⱸ 12(inlet 12) 12 ޱⱸ ϳ ޱⱸ ũⰡ 0.9m(, x )0.1m(, z ) 12 ޱⱸ ũⰡ ϴ. 12 ޱⱸ ׸ Ÿ ٿ ȯ 12 ڱǵ ִ ٴڸ ڱ Ͽ ġǾ ִ. ȯ õ ġ 1(outlet 1)~ 12(outlet 12) 12 ũ ġ ٴڿ ġ ޱⱸ ũ ġ ġǵ

ġǾ ִ. ̷ ޱⱸ ġ ޱⱸκ Ե ð ȯ Ϻθ ȯ η ԵǸ ȯ θ ðϸ鼭 , ȯ θ õ ȴ. (׸ 3) Ÿ õޱ ٴڹ ޱⱸ (׸ 2) ٴڱޱ õ ޱⱸ ٲ ޱⱸ ٲ Ǵ ¸ Ѵ. õ ġ ޱⱸκ Ե ð ȯ θ ȯ η ԵǸ ȯ θ ð , ȯ Ϻθ ٴ ȴ. , õޱ ٴڹ ȯ 12 ڱ ġ õ 12 ޱⱸ ġ ð ߿ ںǰ ڱǿ õκ Խ ð ȿ ̰ ̴. ̿ ȯ ϴ ̵ ο ĵ ( ޹ ) ð ȿ δ δ 󸶳 Ѱ . ̷ ϴ ̸ ߿ ȯ ޹ ÿ ̴.

III.

1. µ

ȯ ð ֿ ȯ ںǰ ðϱ ̹Ƿ ȯ µ ںǰ µ ַ Ͽ. ޱdz Vin = 146 CMM , ȯ x=1.7m y=0.9m ġ z ޹ ĺ ںǰ µ Tc (׸ 4), (׸ 5) (׸ 6) Ÿ. q? PCB =180W/m2 (׸ 4) , ޹ ںǰ µ Tc ȯ A z ϴٰ ȯ B ġ ū ٽ ϸ, ̷ ȯ C ݺȴ. ޹ Ŀ ȯ A, ȯ B ȯ C z Tc ִ. ̴ z=0m ִ ޱⱸκ ð⿡ ȯ ð z Ҹ ̴. ٴڱޱ õ ںǰ µ Tc z ̼ Ҹ ݺϿ z=3.8m ġ ִ밪 Ÿ ִ. õޱ ٴڹ ںǰ µ Tc z=2.2m 4.8m ġ ٸ µ Ÿ ̴ ̵ ġ ð Ҹϱ ̴. ̾ q? PCB =200W/m2 (׸ 5) , ο ںǰ µ Tc z q? PCB =180W/m2 ϸ, q? PCB 20W/m2 Կ ޹ , ٴڱޱ õ õޱ ٴڹ Ŀ ںǰ µ Tc z 4.3, 2.3 3.1 Ǿ ̷κ ߿ ޹ Ŀ ִ. q? PCB =220W/m2 (׸ 6) ο ںǰ µ Tc q? PCB δ. ׷ ޹ Ŀ ںǰ µ Tc z=4.4m ġ ִ뵿µ(75) ʰϹǷ ġ ںǰ Ҿϰ ȴ. ȯ ɻ ȣ ̷ Ƿ ̶ ǰ Ҿ ¿ ְ Ǹ ü ǰ ɿ ġ ȴ. q? PCB=220W/m2 ǰ Ҿ κ ߻Ǵ ޹ q? PCB=220W/m2 ڱ ߿е Ǿ ǰ ŷڼ Ǵ ޹ ִ.

ȯ ð ޱⱸκ ð ޱ dz Vin ް ȴ. ̿ ޱ dz ȯ ð ȭ ȯ ð ޱ ޱ dz ϱ ڷᰡ ̴. ̸ , ޱ dz Vin ũ 50CMM, 100CMM, 150CMM, 200CMM, 250CMM ޱ dz 50CMM ܰ Ű鼭 ̿ ޹ ĺ ǰ µ ȭ Ͽ. ڱ ߿е q? PCB ڱ ߿е q? PCB=200W/m2 Ͽ. ޹ ĺ ޱ dz x=1.7m y=0.9m ġ ִ ǰ z µ (׸ 7), (׸ 8) ׸ (׸ 9) Ÿ. ޹ (׸ 7) , ޱ dz Vin Ҽ z ںǰ µ Tc ϴ ̷ ִ. ޱ dz Vin=100CMM ȯ B ׸ ȯ C Ϻκп ںǰ µ Tc µ Ѱ踦 ǰ Ҿ Ÿ. ޱ dz Vin=50CMM ȯ ǰ Ҿ Ÿ. ׷ ޱ dz Vin=150CMM ̻ʹ ̷ ǰ Ҿ ߻ ʾҴ. ڱ ߿е q? PCB=200W/m2 ޹ ȯǿ Vin=150CMM̻ ð ޱ dz 䱸ȴٰ ִ.

ٴڱޱ õ (׸ 8) , ޱ dz Vin Ҽ z ںǰ µ Tc ϴ ̷ ִ. ƿ﷯ z ںǰ µ Tc ´ ޱ dz ִ. ּ ޱ dz Vin=50CMM ȯ⿡ ںǰ µ Tc 60 ̸ ִ ޱ dz Vin=250CMM ںǰ µ Tc 33 μ ޱ dz ǰ µ ̴. ٴڱޱ õ ȯǿ ޱ dz Vin=50~250CMM dz ִ. ׸ Ÿ ٿ Vin=50CMM 250CMM ޱ dz 5 Ű ںǰ µ 2 ҽų ְ ȴ. ׷ ޱ dz ¿ ʼ ǹǷ ϰ ϴ ںǰ µ ǰ ð Ǹ Ͽ ޱ dz ϴ .

õޱ ٴڹ (׸ 9) , ޹ İ ޱ dz Vin Ҽ z ںǰ µ Tc ϴ ̷ ִ. ƿ﷯ z ںǰ µ Tc ´ ޱ dz ִ. ּ ޱ dz Vin=50CMM 100CMM ȯ Cκп ںǰ Ҿ ߻ ִ. ׷ Vin=150CMM ̻ʹ ںǰ Ҿ Ÿ ʴ´. õޱ ٴڹ ȯǿ ޱdz 150CMM ϴ ǰ ð ִٰ ִ.

2. ð

q? PCB =180W/m2, 200W/m2 220W/m2 ڱ ߿е ܰ Ű鼭 ޹ ĺ üտµ Tmean 񱳸 (׸ 10) Ÿ. ׸ ޹ Ÿ, üտµ Tmean Ÿ. (׸ 10) q? PCB=180W/m2 , ޹ , ٴڱޱ õ õޱ ٴڹ üտµ Tmean 60.5, 38.4 43.1ɷμ ٴڱޱ õ õޱ ٴڹ üտµ Tmean ޹ ĺ . ٴڱޱ õ õޱ ٴڹ üտµ ð ޹ ߿ ٴڱޱ õ üտµ ð ִ. q? PCB=200W/m2 , ޹ , ٴڱޱ õ õޱ ٴڹ üտµ Tmean 20W/m2 q? PCB 4.3, 2.3 2.8 Ǿ, ̷ ޹ üտµ ٸ ĺ Ŀ ִ. q? PCB=220W/m2 üտµ Tmean ϸ ٴڱޱ õ õޱ ٴڹ ޹ ĺ üտµ ð . ٴڱޱ õ õޱ ٴڹ ν q? PCB ޹ ĺ üտµ ð ȿ , Ư ٴڱޱ õ üտµ ð ȿ ̶ ִ.

ٴڱޱ õ õޱ ٴڹ ޹ ĺ üտµ ð 󸶳 Ű° غ , <ǥ 1> ڱ ߿е q? PCB ٴڱޱ õ õޱ ٴڹ üտµ ð ɺ ? mean Ÿ. ǥ ο üտµ ð ɺ ? mean ڱ ߿е q? PCB ϸ q? PCB ? mean ü հ ٴڱޱ õ Ŀ 2.06, õޱ ٴڹ Ŀ 1.67 ȴ. 180~220W/m2 ڱ ߿е ٴڱޱ õ ޹ ĺ 2 üտµ ð Ǹ, õޱ ٴڹ ޹ ĺ 1.7 üտµ ð ִ.

ڱ ߿е q? PCB = 180W/m2, 200W/m2 220W/m2 ڱ ߿е ܰ Ű鼭 ޹ ĺ ִµ Tmax 񱳸 (׸ 11) Ÿ. ׸ ޹ Ÿ, ִµ Tmax Ÿ. (׸ 11) q? PCB= 180W/m2 , ޹ , ٴڱޱ õ õޱ ٴڹ ִµ Tmax 68.9, 40.1 56.8ɷμ ٴڱޱ õ õޱ ٴڹ ִµ Tmax ޹ ĺ . ٴڱޱ õ õޱ ٴڹ ִµ ð , ޹ ߿ ٴڱޱ õ ִµ ð ִ. q? PCB= 200W/m2 , ޹ , ٴڱޱ õ õޱ ٴڹ ִµ Tmax 20W/m2 q? PCB 4.0, 2.4 5.5 Ǿ, ̷ õޱ ٴڹ ִµ Tmax ٸ ĺ Ŀ ִ. q? PCB= 220W/m2 ޹ ִµ Tmax ںǰ ִµ Ѿ ȴ. ޹ ڱ ߿е 220W/m2 Ǿ ϸ ڱ ߿е 220W/m2 ޹ μ ٴڱޱ õ Ǵ õޱ ٴڹ ϴ ںǰ ִµ ʰ ְ ִ. (׸ 11) q? PCB ٴڱޱ õ õޱ ٴڹ ޹ ĺ ִµ ð ȿ Ư ٴڱޱ õ ִµ ð ȿ ̶ ִ.

ٴڱޱ õ õޱ ٴڹ ޹ ĺ ִµ Tmax ð 󸶳 Ű° غ , <ǥ 2> ڱ ߿е q? PCB ٴڱޱ õ õޱ ٴڹ ִµ ð ɺ ? max Ÿ. ǥ ο ִµ ð ɺ ? max ڱ ߿е q? PCB ϴ. q? PCB ? max ü հ ٴڱޱ õ Ŀ 2.27, õޱ ٴڹ Ŀ 1.29μ ٴڱޱ õ ? max õޱ ٴڹ⺸ ũ. 180~220W/m2 ڱ ߿е ٴڱޱ õ õޱ ٴڹ ޹ ĺ 2.3 1.3 ִµ ð Ǹ, Ư ٴڱޱ õ õޱ ٴڹ ĺ ִµ ð ִ. ݱ ٴڱޱ õ İ õޱ ٴڹ üտµ ִµ ð , ٴڱޱ õ ð ޹ ̶ ִ.

(׸ 7~9) ޹Ŀ ǰ ŷڼ ϴ ʿ ޱdz Ͽ. ̸ ִµ Tmax Ѵٸ Ȯ ޹ĺ ʿ ޱdz ̴. ̸ , q? PCB=200W/m2 ޱⱸ ޱ dz Vin 50~250CMM ų , ޹ Ŀ ִµ Tmax ȭ (׸ 12) Ÿ. ׸ , ޹ Ŀ ޱ dz Vin 50~250CMM ų ִµ Tmax ϴٰ ޱ dz Vin=150CMM ٹʹ ȭ ִ. ޱ dz Vin=150CMM ٹʹ ޱ dz ŭ ð ȿ Ÿ ִ. ƿ﷯ ޹ Ŀ ޱ dz Vin=135CMM ִµ Tmax ǰ µ Ѱġ Ѿ ǹǷ ޹ Ŀ ִµ Tmax µ̳ DZ ؼ ޱ dz Vin 135 CMM ̻ ޱǾ ִ.

õޱ ٴڹ Ŀ ޹ İ ޱ dz Vin Ŵ ִµ Tmax ̸, ִµ Tmax µ̳ DZ ؼ ޱ dz Vin 120CMM ޱǾ ִ. ݸ鿡, ٴڱޱ õ Ŀ ޱ dz Vin Ŵ ִµ Tmax ̸ ִµ Tmax ޱ dz Vin δ. ٴڱޱ õ ִµ ð ִ. ̻ غ, ȯ ǰ ¸ ϱ , ʿ ޹ ĺ ּdz ޹ Ŀ 135CMM , õޱ ٴڹ Ŀ 120CMM , ׸ ٴڱޱ õ Ŀ 50CMM ʿϴٰ ִ.

IV.

޹ İ ٴڱޱ õ , ׸ õޱ ٴڹ ȯǿ ޹ 𵨵 ϰ ޹ Ŀ ӵ ȯ ںǰ µ ޹ Ŀ ð Ư ġ Ͽ Ʒ .

ǰ ŷڼ , ޹ ڱ ߿е q? PCB= 220W/m2 ̻󿡼 ޹ ̴. q? PCB ̺ ߿ ȯǿ ٴڱޱ õ ̳ õޱ ٴڹ ޹ Ͽ Ѵ.

180~220W/m2 ڱ ߿е ٴڱޱ õ õޱ ٴڹ ޹ ĺ üտµ ð 2 1.7 , ִµ ð 2.3 1.3 ״. ð ȯ ϴ ޹ ޹ ĺ ð ų Ư ٴڿ õ ð ϴ ޹ ð Ǿ.

޹ Ŀ , ޱ dz 50~250CMM ޱ dz Ҽ ȯ ð Ͽ. 200W/m2 ȯ ڱ ߿е ǰ ¿ DZ ؼ ٴڱޱ õ Ŀ 50CMM ޱ dz ϳ, ޹ õޱ ٴڹ Ŀ 135CMM 120CMM ޱ dz ʿϴ.

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  3. ȫ, , , ȭ ȯdz ð ġù·̼ , ȭõȸ м, 1995, pp. 441~444.
  4. , ISDN ýۿ ںǰ ð, ѱȸ, ISSN 1225-5955. Vol.36, No.4, 1996, pp. 351~364.
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