換熱器的計算---請教

baboon9105

最近單位上新的項目，要選擇換熱器，但是如何計算？板式和管式有啥區別？

olive3000

管式的不好，建議選用板式的。

hemei

管式的冷卻面積沒有板式冷卻面積大

天涯125

可以查閱化工版的機械設計手冊第4冊上面有詳細的介紹換熱面積的算法

13572593532

板式的換熱效率高,不過最好選擇好一些的制造廠家.小的可以用管式的劃算.

液壓青年

這得看你需要得散熱功率是多大，一般大的用板式散熱器

開達

COOLER
SELECTION
. j; @7 H; \! `. e# n; [/ h1 rDesignation:
PV = Power loss [kW]
P01 = Specific cooling capacity [kW/°C]
V = Tank contents [l]
ρoil = Density of the oil [kg/l]
9 G4 C% d, T/ M* b3 ?for mineral oil: 0.915 kg/l
! H' c& T3 q, Z$ s% ?5 R5 sCoil = Specific heat capacity [kJ/kgK]
for mineral oil 1.88 kJ/kgK
+ S7 D. [- C2 r) N/ M∆T = Temperature increase in the
system [°C]
6 X+ e) h; c# F; z& [1 \5 Et = Operating time [min]
, X9 {9 T! i7 @$ P* OT1 = Desired oil temperature [°C]
# h* U# ~& h% H  I. H6 Y  x9 oT3 = Ambient temperature [°C]
Example 1:
& G! k8 m) ^% YMeasurement of the power loss
# ^7 V" y2 ^+ {7 A" x+ bon existing units and machinery.
: X) t* B* c" V; cFor this method the temperature
increase of the oil is measured
over a certain period. The power
loss can be calculated from the
temperature increase.
Parameters:
1 p1 x! x& h9 \, G+ N3 W: OThe oil temperature increases
1 N5 B( \& _0 \: x) sfrom 20 °C to 45 °C over
( B  j6 ?0 @5 f- ^9 }6 D4 A15 minutes.
The tank contains 100 l.
" S# B6 o7 e' v$ ^; @2 }  _Heat to be dissipated:
/ d' [3 F0 ^  `PV =（∆T × C oil × ρoil × V）/t × 60    [kW]

' n: V" _4 E. a( b7 D+ ^: }PV =25 × 1.88 × 0.915 × 100 / (15 × 60 )
  K0 }  \9 f: j, t= 4.78 [kW]
Cooler selection:
* l- A# `- L8 S. F! F– Desired oil temperature: 60 °C
' h: K+ W2 n- R– Ambient temperature air: 30 °C

( B: G, z0 G6 XP01 =PV    /  (T1 - T3  ) [kW/°C] =0.159
A 10% safety margin is
recommended to allow for
+ d0 G. t( r; Y  k0 @element contamination, and
4 C& H2 k2 Z8 ~: o& Mtherefore the specific power is:
/ B7 ?, @# |* h6 RP01 × 1.1 = 0.175 kW/°C.
- ]6 |  M3 u* w$ dThe power loss 0.175 kW/°C must
( e6 u: W5 G7 J  j" ]be dissipated by an oil cooler.
/ E' L9 I5 T. O- C, L8 Z6 PSuggestion:
( P, F; T4 w1 u–Cooler OK-ELH2 - 3000 rpm,
8 |0 B7 f7 ~2 N. \P01 = 0.20 kW/°C at 80 l/min
1 l" h) R! x! K$ N" m+ k  P
  f" S+ `7 q+ b, t
我發了一段在上面！