To prevent low evaporation temperature, you can take the following measures:

Insulation: Properly insulate the system or equipment where the low evaporation temperature is an issue. Insulation helps to minimize heat loss and maintain higher temperatures, preventing the evaporation temperature from dropping too low.

Heat Sources: Increase the heat input to the system. This can be done by adding additional heat sources, increasing the power or capacity of existing heat sources, or improving heat transfer efficiency. By supplying more heat to the system, you can elevate the evaporation temperature.

Heat Recovery: Implement heat recovery systems to capture and reuse heat that would otherwise be lost. This can help to supplement the heat input and maintain higher temperatures, preventing the evaporation temperature from dropping too low.

Control System: Optimize the control system to maintain stable and appropriate operating conditions. Ensure that the system's temperature controls, sensors, and feedback mechanisms are properly calibrated and functioning correctly. This will help to regulate the heat input and prevent the evaporation temperature from falling below the desired level.

Fluid Properties: Consider using fluids or substances with higher boiling points or lower vapor pressure. By selecting appropriate fluids for the system, you can raise the evaporation temperature and reduce the risk of it dropping too low.

System Design: Evaluate the system design to identify any factors contributing to the low evaporation temperature. This may include reviewing the sizing of heat exchangers, assessing flow rates, or examining pressure differentials. Modifying the system design as necessary can help to mitigate low evaporation temperature issues.

It is important to note that the specific approach to prevent low evaporation temperature will depend on the particular system or application. Consulting with experts or professionals in the relevant field, such as thermal engineers or process designers, can provide further guidance tailored to your specific situation.