- 35 -
Output cooling capacity at 0
℃
(W)
400
Refrigerant
R134a
Total power(W)
450
Circulation
pump
Power
（
W
）
15
Flow rate(L/min)
17
Pressure
（
bar
）
0.2
Secondary refrigerant outlet and return port
PP tube:
Φ10×1.5mm
Connection hose
Silicone rubber hose: Φ13×Φ9mm
Liquid storage tank material
304 stainless steel
Dimensions (mm)
（
W×D×H
）
245×430×550
Net weight (kg)
26
* The operating temperature range should be ≤ (room temperature
- 5)
℃
.
IV.
Operation
1.
Secondary refrigerant selection
The expected target temperature is determined by the type of secondary refrigerant used in the DL-
400 recirculating chiller. The secondary refrigerant should be non-toxic and non-corrosive, and its
viscosity at low temperature should be μ≤22mPa•s.
1)
When the operating temperature is above 10°C, it is recommended to use distilled water or
deionized water as the secondary refrigerant.
2)
When the operating temperature is -15-10°C, it is recommended to use 99% (mass fraction)
ethanol; or use ethylene glycol aqueous solution (see the table below), and the minimum
operating temperature should be 10°C higher than the freezing point.
Corresponding relationship between the proportion of ethylene glycol aqueous solution and the freezing point
Mass fraction(%)
15
25
30
40
50
55
Freezing point (
℃
)
-5
-10
-15
-22
-33
-40
