Rod Dry Dec 2013

Training Module #7: Problem Statement The Quick Start gas compressor example (with default settings) has two compression stages with intercooling, but gas leaves the second stage at a relatively high temperature (329°C). 1.If an aftercooler is added (with the same physical geometry as the intercooler) and operates as an open (multi-tube) radiator to atmosphere, what will be the change in final gas exit temperature? 2.If cooling water is used on the outside of the aftercooler tubes, what will be the gas outlet temperature and what is the required cooling water heat load? Gas Compressor Aftercooling

Training Module #7: Step 1 of 8 1.Click on the Quick Start Icon ( ) and say “Yes” to the current project overwrite warning. 2.Select “Two-Stage Gas Compressor with Intercooling”, then press “Go”.

Training Module #7: Step 2 of 8 1.Right-click on the bend in the second stage outlet line, then select “Edit” 2.Change “Rotate Clockwise to” from 270 to 180 degrees, then press OK.

Training Module #7: Step 3 of 8 1.Right-click on the heat exchanger end-cap and select “Copy” 2.Right-click on the outlet bend (the same one as before) and select “Paste Downstream” Note: The new heat exchanger has nothing on the outside of the tubes, so these tubes will lose heat to ambient in the same way as normal bare pipes.

Training Module #7: Step 4 of 8 1.Solve the model 2.Select Fluid Temperature

Training Module #7: Step 5 of 8 1.Press the result Graph Icon ( ) and activate Pressure & Temperature 2.Select “Line Outlet” Gas outlet temperature is 246 °C with “radiator” tubes

Training Module #7: Step 6 of 8 1.Right-click on the (new) heat exchanger tube bundle, then select “Edit”. 2.Click on the blue “Process Cylinder” icon to add a cooling water jacket. 3.Re-solve the model.

Training Module #7: Step 7 of 8 1.Press the result Graph Icon ( ) 2.If necessary, activate “Fluid Pressure” and “Fluid Temperature” as shown 3.Select “Line Outlet” Gas outlet temperature is 58 °C with cooling water

Training Module #7: Step 8 of 8 1.Right-click on the (new) heat exchanger tube bundle and select “Properties” Bundle Heat load is 488 kW (negative sign indicates heat extraction)

Training Module #7: Solution Review The Quick Start gas compressor example (with default settings) has two compression stages with intercooling, but gas leaves the second stage at a relatively high temperature (329°C). 1.If an aftercooler is added (with the same physical geometry as the intercooler) and operates as an open (multi-tube) radiator to atmosphere, what will be the change in final gas exit temperature? Answer: Gas outlet drops from 329 °C to 246 °C 2.If cooling water is used on the outside of the aftercooler tubes, what will be the gas outlet temperature and what is the required cooling water heat load? Answer: Outlet temperature is 58 °C and the aftercooler cooling water heat load is 488 kW. Gas Compressor Aftercooling

Final Step: Save For Future Reference 1.Select File  Save ΣPipe Project As… and call this case “Gas Compressor Example”, then press “Save”. Well done, take a well-earned break!