SMC Networks HEF Series, Руководство пользователя

Страница: 6 / 16

Temperature [
°
C] Density
ρ
[kg/m
3
] Specific heat C [J/(kg·K)]
10 1.03 x 10
3
3.93 x 10
3
20 1.03 x 10
3
3.95 x 10
3
30 1.02 x 10
3
3.97 x 10
3
40 1.02 x 10
3
3.98 x 10
3
50 1.01 x 10
3
4.00 x 10
3
60 1.01 x 10
3
4.02 x 10
3
HEF
Series
Cooling Capacity Calculation
Q =
Δ
T x V x
웂
x C
h x 60 x 1000
10 x 2 x 1 x 10
3
x 4.2 x 10
3
15 x 60 x 1000
= 93.3 W
=
Cooling capacity = Considering a safety factor of 20 %,
93.3 W x 1.2 = 112 W
After 15 min,
cool 30 °C down to 20 °C.
Water bath
Example When cooling the object below a certain temperature in certain period of time.
Cooled substance total volume V : 2 L
Cooling time h
: 15 min
Cooling temperature difference
Δ
T : Temperature difference: 10
°
C (10 K). Cool from 30
°
C (303 K) to 20
°
C (293 K).
Circulating fl uid : Tap water
Density
웂
: 1 x 10
3
kg/m
3
Specifi c heat C : 4.2 x 10
3
J/(kg·K)
∗
Refer to the information shown below for the typical physical property values by circulating fl uid.
Circulating Fluid Typical Physical Property Values
Ethylene Glycol Solution 20 %
Water
Density
웂
: 1 x 10
3
[kg/m
3
] Specifi c heat C: 4.2 x 10
3
[J/(kg·K)]
Air-cooled
20
°
C
V
5