天美影院

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?= ?= ?×?×?×?/?

???: ?= ???? ?????? ??????? (???? ???)? ?= ???????? ???????? ?????? (???/?-?)? ?= ????? ?????? ?????? ???? ????? ??????? ?? ????? (??).ΔT= ?????? ?? ???? ??????? ??? ?????? (????) ? L = ??? ?????? (?).

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?=?×?×?×?

??? ???? h ????? ?????? ??????? ?????? ??????? (W/??-?).

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????? ?????? ??????? ??? ???????? ??????? ?????? ??? ??? 5000 ???/?-?. ??? ????? ??? ?????? ???? ?? ????? ???? ?????? ????? ??????? ?? ?????? ?? ???? ???? ????? ????? ???????. ????? ?????? ??????? ?????? ??? ?????? ??????? ??????? ??? ?????? ???????? ???????? ??????? ???????? ?????? ??? ????????? ???????? ?????? ?? ????? ?????? ?????? ????. ??? ???? ??? ???????? ??? ???? ??????? ?????? ????? ??????. ????? ????? ?????? ?????? ???????? ????? ?? ??? ?????????? ????????? ???????? ???????? ??????? ??????? ???????? ???????? ??????? ????????.

?????? ???????	???????? ???????? (k)? (???/? ????)	??????? (?????/???)	??????? (ρ? ??/?? ????)	?????? ??????
????????	200 - 250	2 - 3	2.7	???
??????	390 - 400	6 - 7	8.9	?????
??????? ??????? ?????	16 - 25	1 - 3	8.0	?????
????????	100 - 2000	10 - 15	1.5 – 2.0	?????

????? ??? ??????? ?? ????? ????????? ????????

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Q_???????=-?×?×?×?/?

??? ?????? ???? ?????? ????? ???? ??? ??????? ?? ?????? ??? ??? ?????? ???????? ??? ???? ?????? ?? ???????.

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??? ????? ?????? ??? ??????? ??????? ???????? ???????? ????? ??????? ?? ????? ??????? ??? ????????? ??? ???? ??? ????? ??? ????? ??????? ???????? ????????.

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????? ????? ??????? ??? ??????? ??????? ??? ??? ??? ????? ????? ??? ?????? ???? ??? ????? ?? ??????. ?????? ???? ??????? ??? ?????? ????? ????? ????? ???????:

Q_{????? ???????}= ?×?×?×?

????? ????? ??????? ??? ??????? ??????? ?? ???????? ??? ???? ???? ????? ??????? ?????? ?? ???? ?????? ???????. ????????? ???? ???? ??? ???? ????? ??? ?????? ????? ???????.

??????? ??????? ?? ????? ???????? ???? ???? ????? ??? ???? ?????? ???????. ??? ????? ????? ????? ??????? ?? ??? ??? ???? ?????? ????? ????? ???? ???? ??????? ??????? ??? ?????? ??????.

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???????

????? ?? ??? ????? ??????? ??????? ??????? ???????? ??????? ??????????????? ??? ?????? ??? ????. ???? ????? ??????-???????? ???:

Q_???????=?××××础×(罢_?????⁴ - T_?????⁴)

??? ?= ???????? ????? (??? ?????)? σ = ???? ??????-???????? (5.67×10-8 ???/??-?)? A= ????? ??? ?????? ??????? (??)? T_?????= ???? ????? ??? ?????? ??????? (????)? T_????? = ???? ??????? ??????? (????).

?? ????? ?????? ???????? ????? ??????? ??? ??? ???????. ???? ?? ???? ????? ???????? ?????????? ???? ???? ?? ?????????? ??? ????? ??? ??????? ????????? ???? ????. ???? ?????? ??? ?????????? ??????? ?? ??? ??????? ??????? ???? ???? ??????? ??? ????? ?? ????? ???????. ????? ??? ???? ???? ??????? ???????? ?????? ??????? ????? ????? ?????? ?? ??? ?????? ????? ??????? ?????????. ??????? ?????? ?????? ?????? ??? ??????? ???? ???? ??? ???? ???? ?????? ?????? ???????. ?? ?????? ?? ???????? ????????? ????? ????? ????? ??????? ???????? ??????? ?? ?????? ?? ???????? ???????? ??????? ?????? ??? ???????? ????? ?? ??????? ??????.

????? ??????? ?????? ??????? ?? ????? ???????? ????????

????? ????? ?????? ???????

????? ????? ?????? ??????? ???? ???? ??? ??? ?????? ??? ???? ??? ??????? ?????? ??????? ????? ??? ????? ?????. ????? ????? ????? ??????? ????? ????? ????? ????? ?????? ???????? ??????? ??????? ??????? ?????? ???????:

?=?×?×?×?

????? ?? ?????? ??????? ????? 50 ???? ?? ????? ?????? ??????? ?????? ??????? h=50 ???/??.K. ????? ????? ?? ????? ?? ???? ??????? ??? ?????? ?????????? ??????? ?? ΔT = 55 ????:

础=蚕/丑Δ罢=50/(50×55)=0.01819尘² ?? 182 ??²

??????? ??? ?????? ???????

????? ??????? ??? ???? ?????? ???????? ?????? ????? ?????? ??????? ???????:

Q_???????=-?×?×?×?/?

?????? ???? ?????? ?????????? ????? ?? k=205 ???/?.???? ? ΔT=55 ???? ???? L=0.01 ?? ?????? ?????? ?????? A=0.01 ??A = :

Q_???????=-205×0.01819×55/(0.01)=20.509办奥

????? ????? ???????

?????? ?????? ??????? ?? ?????? ???????? ?????? ???????? ??????? ????? ???? ?????? ??????? ?? ????? ?????:

Q_???????=(?×?_???????× ΔT)/L) [1/√((h.L)/k)]

??? ?_???????= ??????? ??????? ??????? ??????? (??)

????? ????? ???????? ????????

????? ????? ?????? ??????? ??? ??????. ????? ?? ????? ?????? ?????? ????? ???????? ?? ????? ??????? ???????? ??? ???? ??.

1. ????? ?????????:

?????? ???? ?????? ???????? ??? ????? ????? ????? ????? ???? ??????? ????? ??????? (Q) ?????? (W). ??? ???? ??????? ??? ??? ??? ???????? ??????????? ???? 20 ??? ?? ???????? ??? Q= 20 ???. ??? ???? ??? ???? ??????? ??????? (T_a)? ??? ???? ????? ?????? ???????. ????? ?? ???? Ta = 30^°C. ??? ????? ???? ????? ?????? ?????? (T_j) ?????? ????????. ??? ???? ??????? Tj=85^°C=85^°???????? ???? ??? ?????? ???? ??????? ??????? (ΔT) ???? ???? ??????? ??????? ?? ???? ????? ??????.

Δ罢=罢_j-T_a=85-30=55^oC

2. ???? ???????? ???????? ???????? (R_??):

??? ???????? ???????? ???? ??? ?? ??? ??? ?????? ??????? ??????? ???? ??????? ???????.

R_??= δt/q=55/20=2.75 ???? ?????/?????

3. ??? ??? ?????? ??????? ???????:

????? ?????? ??? ?????? ??????? ?????? ??? ????? ??? ??????? ?????? ????????. ??? ??????? ?????? ?????? ?? ?????????? ???????. ??? ???? ??????? ????? ?????????? ??? ?????? ?????? (k) ???? ????? 205 ???/?-?? ??? ????? ??????? ????????? ????? ???????? ???????.

4. ????? ????? ?????? ???????:

???? ??? ???? ?????? ??????? ?????? ??????? ???????? ???????? ????????. ???? ?? ????? ??????? ?? ???????? ???????? ?? ??????? ??? ??????? ?? ??? ?????? ?? ??????. ??????? ???? ???????? ???? ????? ??????? ??? ????? ??????:

??????? ??? ??????? = ?????? ????? ???????/??? ???????

5. ????? ???????? ????????:

??? ?????? ????? ?????? ???????? ???? ?? ??????? ?????? ???????? ????????. ????? ?? ???? ????? ?????? ??????? ?????? ??????? ?????? (h) 10 - 50 ???/??-?. ???? ???????? ???????? ??????? ??? ????? ??????:

R_???????????=R_{?? ?????? ???????}+R_{?? ?????? ???????}+R_{?? ?????}

??? R_{?? ?????? ???????}= ???????? ???????? ?????? ???????? R_{?? ?????? ???????}= ?????? ????? ?????? ???????? R_{?? ?????}= ???????? ???????? ?? ?????? ??? ?????? ???????.

??????? ?????? ???????:

R_{?? ?????? ???????}=1/?.?_????????

??? ?_????????=????? ????? ??????? ?????? ???????.

6. ??????? ?????? ?????????

?? ????? ?????? ??????? ????????? ?????? ??????? ??????? ?????? ???????. ?? ????? ?????? ??????? ??????? ?????????? ??????? ????? ??????? ????? ??? ???? ??????? ?????? ???? ?????? ???????. ??????? ????? ??? ???????? ???? ????? ??? ????????? ??? ??????? ?????? ???????? ???????? ???????.

????? ??????? ??????? ?????? ??????

????? ??????? ???????? ????? ??????? ???????? ??? ??????? ??????? ???????????. ??? ???? ?? ??????? ?? ???? ?????? ?? ??????? ??? ????? ????? ????. ??? ??????? ??????? ???? ??????? ???? ????? ?? ?????? ??? ????? ???? ??? ??? ?????? ??????? ?????? ?????? ??????? ???? ?????. ????? ???? ??????? ?? ???????? ??????? ?? ??? ??? ??? ???????? ????? ?????? ??????? ?????? ?????? ????? ????? ???????? ????? ???????. ???? ?? ???? ??? ??? ????? ????? ???? ??????? ???? ?????? ???????? ????????.

????????? ???? ???????? ??? ???? ??????? ??????? ??????? ?? ???? ???? ????? ?? ???????? ???????? ???????? ???? ??? ?????? ??????? ???????. ?????? ??? ???? ???? ??? ???? ?? ???????? ??? ?? ??? ??? ??????? ?? ???????? ?? ???? ???? ?????? ?????? ?? ??? ??????? ?????? ???????? ??? ???? ?? ???? ????? ???????. ????????? ??? ???????? ???????? ???????? ????? ??? ?????????? ??????? ???????? (CFD) ????? ???????? ?? ?????? ?????? ????? ?????? ??????? ???? ????. ??????? ??? ????? ??????? ???????? ??? ??????? ????? TIM ??? ????? ???? ????? ????? ??????? ???????.

???????

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???? ??????? ?????? ??????? ???????? ??????? ????? ?? ????? ????? ???????. ?????? ??? ??? ??????? ??????? ???? ??? ??????? ????? ??????.

???? ?? ???? ?????? ????????? ?????? ?????? ??? ???????? ???????? ??????? ????????? ???????? ??? ???? ???????? ???????? ??????? ????? ?? ???????. ????? ????? ???????? ?? ???????? ????? ?????? ????????? ??? ????? ????? ???????? ????????.