17
Operation Method
Selecting heat medium for lower temperature (reference data)
You need to use a heat medium for lower temperature when the cooling temperature is set to 10
℃
or below.
Choose Naiburain® product and its concentration according to 10
℃
lower than working temperature.
Ethylene glycol
Property
Boiling point
197.8
℃
Coagulation
point
-13.0
℃
Ignition point
121.0
℃
Firing point
410.0
℃
SG
(
at 20
℃
)
1.1188
SH
(
at 20
℃
)
0.561cal/g
℃
Evaporative
latent heat
191cal/g
℃
Viscosity
0.021Pa
・
s(20.93CP)
Steam
pressure(25
℃
)
16.0Pa
(
0.12
m
Hg
)
Ethyl alcohol
Property
Molecular weight 46.068
Boiling point
78.32
℃
Coagulation
point
-114.5
℃
Ignition point
13
℃
(closed), 18
℃
(open)
24.7
℃
(60% solution,at25
℃
)
Firing point
439
℃
SG
(
at20
℃
)
0.7893
SH
(
at20
℃
)
0.579cal/g
・
℃
Viscosity
1.0826cp(at25
℃
)
Nybrine
Property
Z1,Z1-K
RH
NFP
50Wt%
100 Wt%
50Wt%
100 Wt%
50Wt%
100 Wt%
Boiling point
(
℃
)
104
117
105
118
102
107
Specific resistance (
Ω・
cm at
25
℃
)
625
1250
270
440
530
970
Conductivity(S
・
m
-1
at 25
℃
)
0.160
0.080
0.370
0.227
0.189
0.103
Steam pressure (KPa at 20
℃
)
1.7
0.5
1.7
0.5
2.3
1.3
Freezing point (
℃
)
-21
-50 or
less
-21
-50 or
less
-13.5
-50 or
less
SG (at20
℃
)
1.05
1.10
1.07
1.134
1.026
1.048
Viscosity (mPa
・
s at 20
℃
)
2.5
9.5
2.5
9.5
2.6
9.4
SH (cal/g at 20
℃
)
0.850
0.670
0.850
0.670
0.773
0.642
Freezing temp of ethylene glycol
Freezing temp of Nybrine
F
r
e
e
Fre
ezi
ng
tem
per
0
-10
-20
-30
-
4
0
-50
0
10
20
30
40
50
60
70
80
90
100
0
-10
-20
-30
-40
-50
Nybrine
density
(
wt
%)
Freezing
temperature
(
℃
)
Usable range
Volume concentration (%)
Temperature (
℃
)
ON
OFF
RE
F
RIGE