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Sustained Subzero Systems
Thermal Fluids for Subzero Systems
Water is the best thermal fluid, but it has one major flaw – it does not remain fluid at extreme temperatures. For systems well-below freezing you need to use a specialty thermal fluid, and Dow Chemical makes the industry standard heat transfer fluids for a range of applications.
Stable Solutions for Subzero Systems
Extremely cold equipment is required for a wide variety of industrial processes. However, it is incredibly difficult to maintain thermal stability and performance for long-term operation. Corrosion, thermal efficiency losses and system leaks can quickly become an ever-present headache if you don’t use the proper thermal fluid solution.
Dow Chemical has decades worth of experience engineering the peak performance thermal fluids for low temperature applications. The DOWTHERM™ J, SYLTHERM™ XLT, and SYLTHERM™ HF products deliver best in class thermal properties combined with an incredibly long operational lifetime.
| Key Physical Properties | DOWTHERM™ J | SYLTHERM™ XLT | SYLTHERM™ HF |
|---|---|---|---|
| Freeze Point (°F) | -120
|
-168
|
-115
|
| Boiling Point (°F) | 358
|
345
|
410
|
| Flash Point (°F) | 136
|
116
|
145
|
| Viscosity (cps at-70°F) | 4.6
|
7.6
|
10.0
|
| Viscosity (cps at -100°F) | 8.0
|
12.6
|
16.7
|
| Vapor Pressure (psia at 70°F) | 0.015
|
0.02
|
0.01
|
Subzero Applications & Use
Dow Thermal fluid solutions provide reliable and long-term operation in some of the most extreme conditions. From environmental test chambers to large, industrial-scale food freezers and countless others inbetween, the Dow solutions provide best-in-class performance for equipment that demands precise temperature control.
The Dow Thermal Fluids listed on this page are intented for use in a closed, pressurized system under nitrogen blanket with an expansion tank.
The diagram below shows a simplified secondary cooling loop for processes requiring sustained subzero temperatures.
Dow Thermal Fluid Properties at -50°F
| Thermal Properties (-50°F) | DOWTHERM™ J | SYLTHERM™ XLT | SYLTHERM™ HF |
|---|---|---|---|
| Thermal Conductivity (Btu/hr ft² °F/ft) |
0.0822
|
0.0717
|
0.0712
|
| Density (lb/ft³) | 56.87
|
56.28
|
58.56
|
| Specific Heat (Btu/lb °F) | 0.394
|
0.354
|
0.364
|
| Viscosity (cP) | 3.3
|
5.6
|
7.3
|
| Heat Transfer Coefficient (Btu/hr ft²°F) (7 ft/sec, 1" pipe) |
195
|
134
|
123
|
| Pressure Drop (psi/100 ft) | 11.15
|
12.27
|
13.44
|
| Pump Horespower (100' & 70% pump efficiency) |
0.159
|
0.175
|
0.191
|
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