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 (329C). 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 (329C). 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 Pipe Project As and call this case Gas Compressor Example, then press Save. Well done, take a well-earned break!