Cooling 7.3 peltier_effect_-_cooling_machine-2

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1. Science - Applied Science - Renewable Energy - 7 Energy from Ambient Heat (P9517300) 7.3 Peltier effect - Cooling machine Experiment by: cooling Printed: Nov 21, 2016…
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  • 1. Science - Applied Science - Renewable Energy - 7 Energy from Ambient Heat (P9517300) 7.3 Peltier effect - Cooling machine Experiment by: cooling Printed: Nov 21, 2016 2:52:52 PM interTESS (Version 12.03 B193, Export 2000) Task Task Is it possible to cool down a beaker filled with water using a Peltier element? A beaker with water is situated on the Peltier element of the thermo generator. If someone lets current flow in this Peltier element while it is set at the correct polarity, the upper plate of the Peltier element cools the water down. Use the space below for your own notes. Logged in as a teacher you will find a button below for additional information. - 1 -
  • 2. Material Materials Materials in the "Pupil Kit for Renewable Energy EN1" (Order Nr. 13287.88) QuantityOrder No.MaterialPosition No. 105770.00Thermogenerator for student experiments1 105903.00Beaker, polished2 238056.00Lab thermometer, -10... +100°C3 136011.01Beaker, 100 ml, low form, plastic4 124025.00Stopwatch, 24h, 1/100 s & 1s5 107360.04Connection cord, 32 A, 250 mm, blue6 107360.01Connection cord, 32 A, 250 mm, red7 107264.00Double socket, 1 pair, red and black8 Additional Material 113505.93Power supply 0...12 V DC / 6V , 12 V AC9 Water Materials needed for the experiment - 2 -
  • 3. - 3 -
  • 4. Setup Setup Fasten the Peltier element to the aluminium block with the help of the yellow clip (fig. 1). Be sure to place the Peltier element in such a way that its smaller side is on top. Fig. 1 Connect the thermo generator to the power supply with the help of both double sockets and the connection cords (fig. 2). The power supply is switched off. Make sure that the red connection cord of the thermo generator is connected to the negative pole of the power supply unit (blue socket) and the black connection cord is connected to the positive pole (red socket). Fig. 2 Turn the current regulator to 1A and the voltage regulator to the stop position (fig. 3). Fig. 3 - 4 -
  • 5. On one side of the aluminium block there is an opening for the temperature measurement (fig. 4). Fig. 4 Insert one of the two thermometers in this opening. Make sure that the measuring tip of the thermometer touches the aluminium block (fig. 5). Fig. 5 In order to prevent the thermometer from slipping out of the opening during the experiment, you can put the other end of the thermometer, for instance, on the cover in which it is kept in the box (fig. 7). Fig. 6 - 5 -
  • 6. Measure 30ml cold tap water using the small beaker and fill the water in the polished beaker. Then place the beaker on the Peltier element (fig. 7). Fig. 7 Now dip the second thermometer in the water (fig. 8). Fig. 8 - 6 -
  • 7. Action Procedure Measure the temperature ϑ1 of the water and the temperature ϑ2 of the aluminium block (at the time t = 0) and write them down. Switch on the power supply and write down the temperatures ϑ1 and ϑ2 at the times t = 1, 2, 3, 4, 5 in table 1 (fig. 9). Fig. 9 Switch off the power supply, pour the water out of the beaker and place the Peltier element on the table. Wait until the aluminium block has cooled down again. Afterwards, repeat the measurement using a current of 0.5A and write down the measured values under table 2. Switch off the power supply, pour the water out from the beaker and place the Peltier element on the table. Interchange the connection cords in the power supply unit (fig. 10). Fig. 10 Take the Peltier element in your hand. Switch on the mains appliance and observe the temperatures in the Peltier element (fig. 11). Take down your observations in (1). - 7 -
  • 8. Fig. 11 Switch off the power supply again. - 8 -
  • 9. Results Results Table 1 Measurement with a current 1A ϑ2 in °Cϑ1 in °Ct in min nnnnnnnnnnnnnnnnnnnn0 nnnnnnnnnnnnnnnnnnnn1 nnnnnnnnnnnnnnnnnnnn2 nnnnnnnnnnnnnnnnnnnn3 nnnnnnnnnnnnnnnnnnnn4 nnnnnnnnnnnnnnnnnnnn5 Typical Results Measurement with a current 1A ϑ2 in °Cϑ1 in °Ct in min 22,022,00 23,020,51 25,018,52 27,017,03 28,516,54 29,516,05 - 9 -
  • 10. Table 2 Measurement with a current 0,5A ϑ2 in °Cϑ1 in °Ct in min nnnnnnnnnnnnnnnnnnnn0 nnnnnnnnnnnnnnnnnnnn1 nnnnnnnnnnnnnnnnnnnn2 nnnnnnnnnnnnnnnnnnnn3 nnnnnnnnnnnnnnnnnnnn4 nnnnnnnnnnnnnnnnnnnn5 Typical Results Measurement with a current 0,5A ϑ2 in °Cϑ1 in °Ct in min 23,023,00 23,522,51 24,021,52 25,020,53 25,520,04 26,020,05 Observation of the temperature after the pole change (1) - 10 -
  • 11. After the change in pole, the smaller plate of the Peltier element heats up and the bigger plate cools down. - 11 -
  • 12. Evaluation Evaluation Question 1 What influence does the current flowing through the Peltier element have on the temperature of the water and the temperature of the aluminium block? Answer Due to the applied voltage a current flows through the Peltier element. The water in the beaker cools down and the aluminium block warms up. Question 2 What is caused by changing the intensity of current from 1A to 0.5A c? - 12 -
  • 13. Answer When using a current intensity of 0.5A the water cools down more slowly than with a current of 1A and the aluminium block also heats up more slowly. Question 3 What do you observe when changing the poles of the voltage? Answer After changing the poles of the voltage the small plate heats up and the big plate cools down. - 13 -
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