A compressor's net oil pressure is calculated by?

Calculating a compressor's net oil pressure involves determining how much effective pressure is available for oil distribution within the system. This is achieved by adding the crankcase pressure to the oil pump discharge pressure. The crankcase pressure reflects the pressure that is existing in the crankcase due to compression and other factors, while the oil pump discharge pressure indicates the pressure at which the oil pump delivers oil to ensure proper lubrication and cooling.

When these two pressures are combined, it provides an overall understanding of the net pressure that drives oil to the necessary components of the compressor. The addition is essential because the crankcase pressure can enhance the oil distribution process, thereby ensuring optimal operation of the compressor by effectively supplying oil where it's needed most.

Other methodologies such as subtraction, multiplication, or averaging wouldn't portray the true net oil pressure as they do not account for the correct physical principles governing oil flow and pressure dynamics in the system.