Some Common Machines and Processes

Several very common types of machine and process forms of the energy balance. 

The adiabatic throttle is a reasonable model for any partially open valve, the 

In this system there is no work done except the injection work, which we have excluded from dW /, therefore, dW =0. When we make these substitutions in Eq. 4.34, we find 

Example 4,6. Freon 12 flows steadily through an insulated throttle valve. The upstream conditions are lOOpsia and 100°F. The downstream pressure is 20 psia. What is the downstream temperature  

Turbine, expansion engine, compressor, fan, blower, or pump. 

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