Laboratory #1 - Supplemental Guide (1)

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Palo Alto College *

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4312

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Mechanical Engineering

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Apr 3, 2024

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pdf

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ME 4312 - Thermal and Fluids Laboratory | Page 1 of 4 The University of Texas at San Antonio (UTSA) Klesse College of Engineering and Integrated Design Department of Mechanical Engineering ME 4312 - Thermal and Fluids Laboratory Laboratory Assignment # 1 : Analysis of Pumps in Series and Parallel Configurations Supplemental Guide Experimental Procedures: The descriptions presented below are supplemental of the descriptions presented in the condensed manual. The switch in Figure 1 is the mains isolator switch. There are two of these switches. The one on the left of the apparatus powers pump 1, as well as the pressure sensors and readouts. This switch should be on for the duration of the lab. The switch on the right of the apparatus powers pump 2 and should only be on when testing series and parallel pump configurations. Figure 1. Mains isolator switch. Before starting any pump, make sure to zero out the pressure transducers (Figure 2). There is also a button to zero out the torque input on both motors. These should also be pressed before starting the motors attached to the pumps. To start the motor, press the green button (at left), and stop it with the red button (at right) shown in Figure 3. The black knob controls motor rotational speed in RPM and is very sensitive. For all tests, you need to run the motors at 3,000 RPM (or as close as 3,000 RPM as possible). If you get within +/- 10 rpm you can record your results as long as you note your exact measurement of rotational speed in RPM. Figure 2. Zero out pressure transducers. Figure 3. Motor controls. Before actually running each experiment, you will need to turn the speed controls on the motors you are using for the current test to max RPM. You will look at the pressures in the system to determine if the system is properly bled. On the two motor control panels, you can find the expected pressure readings for each pump configuration (see Figure 4). The actual pressures should match these values (see Figure 5); if they don’t, let your TA know so they can prop erly bleed the system.

ME 4312 - Thermal and Fluids Laboratory | Page 2 of 4 Figure 4. Expected pressure readings. Figure 5. Actual pressure readings. The outlet valve in Figure 6 should be handled slowly and with both hands. It is PVC on PVC and does have a tendency to bind because of this. For the single, series, and parallel tests this valve should be closed in 0.1 bar increments (read as pressure P4). This should be done up to 1.5 bar (again, read as pressure P4). DO NOT EXCEED 1.5 BAR WITH THE OUTLET VALVE! Figure 6. Outlet valve. Due to inappropriate handling of equipment by students in the past, part of the inlet valve for pump 2 broke off. This part was responsible for limiting how far the valve can be opened. To avoid further damage to the valve, stop opening the valve when the threads on the shaft are flush with the end of the pipe, as shown in Figure 7. Do not do as in Figure 8. The inlet valves require many turns to fully open or close. Figure 7. Good way to open valve. Figure 8. Bad way to open valve.

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