- Experiment 3 Analysis Of A Concentric Tube Heat Exchanger With Paralleland Counter Flow Arrangement 1 1 Aim Demonstratio 1 (300.08 KiB) Viewed 37 times
1.4.4 Set the temperature as desired by adjusting the temperature control to the required temperature. (For safety the temperature controller is set from factory at Maximum operating temperature of 80°C). 1.4.5 Switch on the hot water pump. 1.4.6 Adjust the hot water flow rate via the valve to the desired value that can be read on the hot water rotameter. 1.4.7 Adjust the cold-water flow rate via the valve to the desired value that can be read on the cold-water rotameter. 1.4 1.4.8 wait until the temperatures of the cold water and hot water become steady. THT3701 a. Read the temperatures of the hot tube at the points CH1, CH2 and CH3 at the corresponding positions TH1, TH2 and TH3, respectively. The reading is digitally displayed. b. Read the temperatures for the cold tube at the points CC1, CC2 and CC3 at the corresponding positions TC1, TC2 and TC3, respectively. The reading is digitally displayed. 1.4.9 Adjust the cold-water flow rate and repeat the steps a. and b. above. 1.4.10 Repeat the experiments with different hot water flow rates and inlet temperatures. 1 TH 240 MULTI HEAT EXCHANGER Front view Figure 1.2: Control panel Side view ELCO B. Counter flow To obtain a counter flow arrangement, reverse the cold-water connection by exchanging the quick fitting tube inlets and outlets in the concentric tube. To achieve this target, do the following: - Switch off the pump. - Connect pipe from cold water outlet to CC2. - Connect a second pipe from the other cold-water outlet to CC1. - Repeat the steps 1.4.5 through 1.4.10 Remark: To remove the hose, please press on plastic shoulder with one hand and use the other hand to remove the hose. (63 X
Test No. Tes tNo. 1.5. Experimental Data Sheet TH240 Multi type heat exchangers Tested by.............. Pipe sizes (12mm OD x 8mm ID ) Heat exchanger type: Concentric tube Hot water pipe inside area = Hot water pipe outside area =. Hot Water 12 Flow Rate (litre/min) Cold Water -ww.mm Flow Rate (litre/min) 1.6 3.2 4.8 1.6 3.2 4.8 Date. mm² gh (W) Flow Arrangement Hot Water Temperature (°C) Inlet Mid-point Cold water heat transferrate TH1 20.5 18.5 30.2 26.8 34.1 19.3 27.6 36.2 Parallel @30°c Parallel @40°c Parallel @50°c 39.4 Counter Flow @30 21.7 Counter Flow @40 31.1 Counter Flow @50 41.1 TH3 Overall heat transfer coefficient Uo W/m². C Outlet TH2 1.7 Conclusions Draw appropriate conclusions based on the results obtained from the experiment. 1.8 References 16.6 24 29.8 16.9 24.3 31.3 1.6. Calculation 1.6.1 Calculate overall heat transfer rate for cold and hot water respectively. 1.6.2 Calculate overall heat transfer coefficient based on outside, inside and meansurface of heat transfer area respectively. 1.6.3 Calculate heat exchanger effectiveness. 1.6.4 Summarise your results as follows: Hot water heat transferrate gh (W) Overall heat transfer coefficienti W/m². C Cold Water Temperature (°C) Inlet Mid-point TC1 TC3 14.7 15.3 14.9 17.6 15.1 18.3 15.2 15.8 15.3 17.0 15.4 18.4 Overall heat transfer coefficient Um W/m²..c Outlet TC2 15.3 17.2 19.6 15.8 18.1 20.8 Effectivenessof heat exchanger € 62 X