Thermal Systems
Closed-Loop Thermal Fluids
Closed-loop thermal oil systems require a heat transfer fluid matched to the maximum operating temperature, heater film temperature and service life requirements of the specific installation. NEXT Lubricants supplies mineral and synthetic thermal fluids for closed-loop heat transfer systems across industrial process heating, solar thermal, waste heat recovery and marine heating applications.
Knowledge
Fluid Selection Considerations for Closed-Loop Thermal Systems
Maximum Operating Temperature
The fluid must be rated for the maximum bulk fluid temperature and heater film temperature of the system — operating above the fluid's recommended temperature limits accelerates thermal cracking and deposit formation, reducing fluid life and increasing the risk of system fouling.
Fluid Condition & Service Life
Thermal fluids degrade gradually through thermal cracking and oxidation during service — regular fluid sampling and acid number, viscosity and flash point analysis are standard practice to determine when fluid maintenance or replacement is required before system performance is affected.
Fire Point & Safety Margins
The fluid's flash and fire point relative to the maximum system operating temperature determines the safety margin of the installation — a fluid operating close to its flash point creates a fire risk in the event of a leak, making fluid selection an important element of system safety assessment.
products
Closed Loop Thermal Fluids
NexthermClean+
Fast-acting thermal oil system cleaner for mineral oil-based thermal systems
Treat Rate: Mineral
ISO Range: 5-10%
Cross reference tool
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