Which of the following is necessary for the cooling and sealing function in a screw compressor?

In a screw compressor, the cooling and sealing functions are essential for maintaining operational efficiency and preventing wear due to friction. The correct choice of sealing fluid is crucial for the proper functioning of the compressor.

Silicone-based fluid is commonly used in screw compressors due to its unique properties. It has excellent thermal stability, low volatility, and good lubricating characteristics, which help in reducing wear on the compressor components. Its viscosity remains consistent over a wide range of temperatures, making it effective at cooling while also providing a reliable seal between the rotors. This sealing function is necessary to prevent leakage of the gas being compressed and to ensure efficient operation.

Other fluids may not possess the same combination of properties needed for the specific demands of a screw compressor. While options such as water, fluorinated fluids, and mineral oil can serve various functions, they may not provide the necessary thermal stability and sealing capabilities required in this particular application. Thus, silicone-based fluid is highly suitable for the cooling and sealing functions within a screw compressor.