Paratherm™ LR Low Range Heat Transfer Fluid

Single Fluid Heating and Cooling – Non Aromatic – Non Aqueous
Paratherm LR heat transfer fluid is an aliphatic-hydrocarbon based heat transfer fluid designed for use in closed-loop, liquid phase heating and cooling systems up to 232°C in electric and steam heaters and down to a -14°C surface temperature in direct-expansion exchangers. Registered HT-1 for incidental food contact by NSF
Applications include:
- Specialty chemical batch heating and cooling
- Pharmaceutical Production Equipment
- Secondary Coolant (“Brine”) Systems
- Replacing Silicone Oil? Simply drain and refill
- Food Processing
Reduce Process Hazards when Processing Water-Sensitive Product
Many products undergo a violent exothermic reaction when exposed to water. Paratherm LR can be used safely for temperature control in these reactions because, unlike water/glycols, it’s not mixed with water. And because it contains no double bonds or bonded oxygen molecules, it’s extremely stable.
Wider Temperature Range than Glycols
Paratherm LR has higher heat-transfer coefficients than 50% ethylene-glycol and 50% propylene-glycol solutions below -5°C and -15°C respectively. And while glycol solutions have a maximum operating temperature of 160°C, Paratherm LR is completely stable up to it’s 232°C maximum operating temperature. Stability tests showed less than 3% degradation after 500 hours at 287°C.
Typical Properties*
Chemical Name | Paraffinic hydrocarbon |
Appearance | Water White Liquid |
Odour | Odourless |
Maximum Recommended Film Temperature | 260°C/500°F |
Maximum Recommended Operating Temperature | 232°C/450°F |
Minimum Operating Temperature 20 mP-s (20 cPs) | -50°C/-58°F |
Minimum Start-up Temperature 300 mP-s (300 cPs) | -80°C/-112°F |
Viscosity at 15°C mm2 /sec (cSt) | 2.4 |
Density at 15.5°C/60°F kg/m3 (lb/gal) | 766 (6.4) |
Flash Point Closed Cup (D56) | >54°C/130°F |
Autoignition Temperature (maximum 10 sec ignition delay | >260°C/500°F |
Boiling Point (101 kPa/14.7 psia) | 202°C/397°F |
Vapour Pressure @ maximum operating temperature kPa (psia) | 145 (21) |
% Volume expansion over recommended operating temperature per 37°C (°F) | 12.2 (6.8) |
Average Molecular Weight | 160 |
Dielectric Breakdown voltage D1816-04 (kV, 0.1″ gap) | 22.15 |
Dielectric Constant (1 KHz) D924-04 | 2.03 |
Dissipation Factor (1 KHz) D924-04 | 0.00001 |
Volume Resistivity at 100V (?-cm) D257-07 | 1.84X1014 |
Heat of combustion (approximate) kJ/kg (BTU/lb) | 46,300 (20,000) |
Heat of vapourization (approximate) kJ/kg (BTu/lb) | 262 (113) |
* These are typical laboratory values, and are not guaranteed for all samples. ** Note: Normal practice is to size expansion tanks so that they are 1/4 to 1/3 full when the system is cold, and 2/3 to 3/4 full when the system is at the maximum normal operating temperature.
Paratherm LR™ vs. Ethylene Glycol and Propylene- Glycol Solutions — Comparison of Heat Transfer Coefficients
Physical Properties
Paratherm LR
|
Propylene Glycol** | Ethylene Glycol** | |||||||||||||
Temp* | Density* | ThermalConduct.* | Viscosity* | Spec.Heat | Dens. | Therm.Cond. | Visc. | Spec.Heat | Dens | Therm.Cond. | Visc | Spec.Heat | |||
50 | 6.4 | 0.088 | 2.1 | 0.47 | 8.9 | 0.206 | 10.7 | 0.80 | 9.1 | 0.215 | 5.5 | 0.74 | |||
-4 | 6.6 | 0.090 | 5.0 | 0.44 | 9.0 | 0.193 | 73.0 | 0.77 | 9.2 | 0.199 | 22.1 | 0.71 | |||
-22 | 6.7 | 0.090 | 7.3 | 0.43 | 9.0 | 0.188 | 172.8 | 0.76 | 9.3 | 0.193 | 44.0 | 0.70 | |||
*Density, lb/gal*Thermal Conductivity, BTU/(hr- ft²-°F/ft)*Viscosity, cP*Specific Heat, Btu/(lb-°F)
*Temperature, ºF |
**All data pertaining to Propylene and Ethylene glycol was obtained from Dow literature for the Dowfrost HD and Dowtherm 4000 @ 50% by Volume respectively | ||||||||||||||
Fluid Film Coefficient – hi***
Temp | Paratherm LR | Propylene Glycol | Ethylene Glycol | ||
50 | 157 | 199 | 277 | ||
-4 | 106 | 77 | 137 | ||
-22 | 89 | 51 | 97 | ||
Based on 3/4″ Sch. 40 pipe @ 4’/sec.***hi, BTU/(hr-ft²-°F) |
Conclusions:
- At 50°F, glycol solutions have higher coefficients
- At -4°F, LR has a higher coefficient than Propylene Glycol solution
- At -22°F, LR has almost the same coefficient as Ethylene Glycol solution
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