1. Heat Exchangers Results Josué Ortiz #57703 Prof: Eduardo Cabrera Me 4111-04

2. Outline Introduction and objective definition Experimental Procedure Experimental Result Conclusion Recommendations

3. Introduction A heat exchanger is a popular device used in the industry to heat or cool a fluid There are different types of heat exchangers subject to the requiring situation in practice For this experiment introduce The Concentric tube heat exchanger and Plate Heat exchanger

4. Objective The objective of the present experiment is the characterization of the heat transfer in several kind of Plate Heat Exchanger and Concentric Heat Exchanger.

5. EXPERIMENTAL PROCEDURES This procedure must be performance using all heat exchanger available. In this procedure it used the Shell and tube heat exchanger as example. Before proceeding with the experiment, make sure that the Shell and tube heat exchanger HT33 unit has been properly located on the HT30X. Ensure also that the thermocouples are properly connected to the sockets (part 11 from figure 3.8), and the wáter supply connections provide countercurrent operation as shown in figure 3.12.

6. Figure 3.12 Schematic for countercurrent operation of the HT33 shell and tube heat exchanger unit

7. EXPERIMENTAL PROCEDURES The procedure to perform this task is as follow: Turn On the main switch (Part 1, Figure 3.9) Set the temperature controller to set point of 50 0 C (Part 3, Figure 3.9), then switch On the hot water circulator (part 6, Figure 3.9). Set the flow indicator switch (part 8, Figure 3.8) to F cold and adjust the cold water control valve V cold (see Figure 3.12) to give approximadely 1 liter/min. Then set the flow indicator switch to F hot and adjust the hot water control valve V hot (see Figure 3.12) to give approximately 1 liters/min. When the heat exchanger stabilizes(monitor temperatures using the switch meter, part 10, Figure 3.8), record the data for T 1, T 2, T 3, T 4, F hot, and F cold in table 3.2 Repeat the above for different setting of hot and cold flowrates as flowrates as follows, and for temperature setting and current flow direction setup

8. Volumetric Flows and Set point Temp. (°C) Fhot lt/minFcold lt/minCurrent Flow Co-current Flow 1140506050 12---50--- 12.5---50--- 1.5140506050 1.52---50--- 2140506050 2240506050

9. EXPERIMENTAL PROCEDURES Repeat the whole process for the concentric tube heat exchanger (HT31), and the plate heat exchanger (HT32). For the concentric tube heat exchanger (HT31) and the plate heat exchanger unit (HT32) the pressure drop across the heat exchanger will prevent reaching the high values of flow rate make this task with the combination of flow rates possible. For co-current flow reversing the hot connections from the service unit for shell and tube heat exchanger (HT33) otherwise reversing the cold connections for concentric tube heat exchanger (HT31) and the plate heat exchanger (HT32).

10. Results

13. Table 3.6 Differences Between Co-current and Countercurrent Operation Calculation

14. Results Table 3.7 Overall Heat Transfer Coerricient

15. Results

19. Conclusion In this experiment was performed and analyses the heat transfer in the different heat exchangers. Was conclude that at major the fluid flow, greater the heat transfer. At pressure drop increase, greater resistance so produces a greater heat transfer. This apply for the Plate Heat Exchanger. Also was experimentally prove that the counter-flow is a more efficient heat exchanger than the parallel flow.

20. Recommendations It’s important to understand HX circuit. Preserve as much water as possible. Adjust the regulator for better control of the flow with the valve. Appropriate thermocouple connection