Which factor controls oil temperature in a hot oil system?

In a hot oil system, the firing rate in the furnace is the primary factor that controls oil temperature. The furnace fires to provide heat to the oil, and the rate at which fuel is burned directly influences how much heat is applied to the system. An increased firing rate results in a higher heat output, which in turn raises the temperature of the oil as it circulates through the heating coils or heat exchangers.

Maintaining the proper firing rate is essential for achieving the desired oil temperature and ensuring the efficiency and safety of the system. If the firing rate is too low, the oil may not reach the required operating temperature, which could affect the overall performance of the system. Conversely, if the firing rate is too high, it can lead to overheating, potentially damaging the system components and creating unsafe operating conditions.

The other factors, such as pump speed, thermostatic control, and atmospheric pressure, do play roles in a hot oil system, but they are not the primary determinants of the oil temperature. Pump speed primarily affects the flow rate of the oil and not the temperature directly, while thermostatic control manages temperature within a certain range rather than being the initial cause of temperature changes. Atmospheric pressure has an influence on boiling points and vaporization but does