换热器的计算---请教

baboon9105

最近单位上新的项目，要选择换热器，但是如何计算？板式和管式有啥区别？

olive3000

管式的不好，建议选用板式的。

hemei

管式的冷却面积没有板式冷却面积大

天涯125

可以查阅化工版的机械设计手册第4册上面有详细的介绍换热面积的算法

13572593532

板式的换热效率高,不过最好选择好一些的制造厂家.小的可以用管式的划算.

液压青年

这得看你需要得散热功率是多大，一般大的用板式散热器

开达

COOLER
SELECTION
9 M  V$ a( p6 |  `' s3 qDesignation:
2 Q% b  ]: Q) |) k" k5 h' QPV = Power loss [kW]
2 a, x' m2 S+ ~- n! VP01 = Specific cooling capacity [kW/°C]
V = Tank contents [l]
- p, Z  n* z, b0 r; L6 N2 \: wρoil = Density of the oil [kg/l]
" ^# @' H% w; z  j7 r+ efor mineral oil: 0.915 kg/l
# J& K: P0 s; {Coil = Specific heat capacity [kJ/kgK]
! d) U6 v0 n' J& ]$ Efor mineral oil 1.88 kJ/kgK
6 O" }/ t, \) w∆T = Temperature increase in the
$ m  R& w9 `$ I) f0 hsystem [°C]
t = Operating time [min]
/ C( i. O0 Y5 \6 N$ a/ l8 A& eT1 = Desired oil temperature [°C]
7 R' I# ?8 O, ]1 J7 L8 ET3 = Ambient temperature [°C]
Example 1:
Measurement of the power loss
+ c9 Q* ~4 V/ i1 S; f% a  }0 kon existing units and machinery.
For this method the temperature
increase of the oil is measured
over a certain period. The power
% D! H3 x; b6 E6 x1 I( Xloss can be calculated from the
temperature increase.
Parameters:
  E8 L# K7 A- A7 P7 S3 cThe oil temperature increases
from 20 °C to 45 °C over
15 minutes.
The tank contains 100 l.
9 ]: R$ {0 N' I7 r+ qHeat to be dissipated:
# I+ [" Q/ W  y1 q. E+ @PV =（∆T × C oil × ρoil × V）/t × 60    [kW]
' q7 B5 @2 \" F! z4 r
PV =25 × 1.88 × 0.915 × 100 / (15 × 60 )
/ y, [9 W  z8 [! J= 4.78 [kW]
Cooler selection:
1 e" n# y! a+ k- {– Desired oil temperature: 60 °C
. |3 c  u5 a; n5 M– Ambient temperature air: 30 °C
( M( e% U& ~/ i  t& ~' Q& d
/ J9 ^3 z# B) xP01 =PV    /  (T1 - T3  ) [kW/°C] =0.159
A 10% safety margin is
5 R+ n1 k% Q8 nrecommended to allow for
element contamination, and
therefore the specific power is:
P01 × 1.1 = 0.175 kW/°C.
The power loss 0.175 kW/°C must
be dissipated by an oil cooler.
) s9 ~3 L" h, C8 E; uSuggestion:
–Cooler OK-ELH2 - 3000 rpm,
5 W& u7 L8 \  h+ FP01 = 0.20 kW/°C at 80 l/min


, ?1 D# {+ @% H* z* E我发了一段在上面！