functions and behaviour of the thermocouples of the test setup. During the experiments there will be 4 thermocouples monitoring temperature. Three different kinds of test have been done to create insight in the behaviour of the test setup. Regarding the maximum temperature regulation, and self-regulating functions. All test runs have been done without sample materials. The data of generated by the thermocouples is logged by a squirrel logger type 2010
2.3.1 Test run 1
The aim of this test run is to examine the maximum temperature that can be reached by the heating element in this setup. The total running time 2 hours and 23 minutes, time interval 10 sec. during this the test the fan has been running on a low RPM.
Remarks:
-This test has been done outside, ( influence thermocouple 4 by incoming wind)
0:09.10 thermocouple has been repositioned from inside furnace to exhaust.
0:09.50 Test has been interrupted by opening door, period of 1 min.
0:44.10 Test has been interrupted by opening door, period of approx. 10 sec
0:46.40 Test has been interrupted by opening door, period of approx. 10 sec
0:53.50 Test has been interrupted by opening door, period of approx. 10 sec
1:05.10 Test has been interrupted by opening door, period of approx. 10 sec
1:39.20 Thermocouple 2 has been taken out of the furnace for identification. And replaced further in the furnace
(distance 4 cm)
Analysis:
the rise of temperature has been examined on the different time intervals while using the full power of the heating element. The results of the temperature rise is shown in graphs (...)The time interval ambient temperature to 150 °C shows an increase of temperature of 3,6 °C/min The time interval 150 to 250 has a temperature increase of 3,1 °C/min The time interval 250 to 360 has a temperature increase of 1,5 °C/min the temperature raise need 77 min
Concluding that the heating process when the
heat element is on full power will decrease as the temperature rises.
Events
Different actions will have different influences on the temperature in the furnace. To start with the opening the door. This event has happened at recording time:
0:09.50; 0:44.10; 0:46.40; 0:53.50; 1:05.10.
0:53.50:The data shows that opening for approx. 10 sec gives a temperature drop of 29,7 °C from 232,9 °C till 203,2 °C and an recovery of the temperature loss within 160 seconds.
1:05.10: a similar event occurred as on 0:53.50, the temperature drop has been 17,6 degrees and the recovery of temperature within 60 seconds.
0:44.10 – 0:46.40: This event shows a double opening of the door in a short period of time. With a total temperature drop of 34.5 °C and a recovery time of 220 seconds.
Concluding that the total mass of the furnace is of such a temperature that opening the door for a short period of time will have a minimal influence on the temperature. The graph also shows the this continuous raise in temperature after opening the door
The deviation between thermocouple K1 and K3 is shown in the graph below. This deviation is slightly increasing as the temperature rises. Varying from 5,7 degrees till 15,0 degrees. As shown in Figure…
y = 0,0055x + 12,159
0:00:00 0:03:40 0:07:20 0:11:00 0:14:40 0:18:20 0:22:00 0:25:40 0:29:20 0:33:00 0:36:40 0:40:20 0:44:00 0:47:40 0:51:20 0:55:00 0:58:40 1:02:20 1:06:00 1:09:40 1:13:20 1:17:00 1:20:40 1:24:20 1:28:00 1:31:40 1:35:20 1:39:00 1:42:40 1:46:20 1:50:00 1:53:40 1:57:20 2:01:00 2:04:40 2:08:20 2:12:00 2:15:40 2:19:20 TEMPERATURE (OC)
TIME (S)
Deviation K1,K3 Deviation K1 K3 Lineair (Deviation K1 K3)
1.1 Introduction
0:00:00 0:01:30 0:03:00 0:04:30 0:06:00 0:07:30 0:09:00 0:10:30 0:12:00 0:13:30 0:15:00 0:16:30 0:18:00 0:19:30 0:21:00 0:22:30 0:24:00 0:25:30 0:27:00 0:28:30 0:30:00 0:31:30 0:33:00 0:34:30
TEMPERATURE (OC)
0:35:30 0:36:50 0:38:10 0:39:30 0:40:50 0:42:10 0:43:30 0:44:50 0:46:10 0:47:30 0:48:50 0:50:10 0:51:30 0:52:50 0:54:10 0:55:30 0:56:50 0:58:10 0:59:30 1:00:50 1:02:10 1:03:30 1:04:50 1:06:10
TEMPERATURE (OC)
1:07:30 1:10:40 1:13:50 1:17:00 1:20:10 1:23:20 1:26:30 1:29:40 1:32:50 1:36:00 1:39:10 1:42:20 1:45:30 1:48:40 1:51:50 1:55:00 1:58:10 2:01:20 2:04:30 2:07:40 2:10:50 2:14:00 2:17:10 2:20:20 2:23:30
TEMPERATURE (OC)
0:00:00 0:05:40 0:11:20 0:17:00 0:22:40 0:28:20 0:34:00 0:39:40 0:45:20 0:51:00 0:56:40 1:02:20 1:08:00 1:13:40 1:19:20 1:25:00 1:30:40 1:36:20 1:42:00 1:47:40 1:53:20 1:59:00 2:04:40 2:10:20 2:16:00 2:21:40 TEMPERATURE (OC)
0:00:00 0:02:00 0:04:00 0:06:00 0:08:00 0:10:00 0:12:00 0:14:00 0:16:00 0:18:00 0:20:00 0:22:00 0:24:00 0:26:00 0:28:00 0:30:00 0:32:00 0:34:00 0:36:00 0:38:00 0:40:00 0:42:00 0:44:00 0:46:00 0:48:00 0:50:00 0:52:00 0:54:00 0:56:00 0:58:00 1:00:00 1:02:00 1:04:00 1:06:00 1:08:00 1:10:00 1:12:00 1:14:00 1:16:00 1:18:00 1:20:00 1:22:00 1:24:00 1:26:00 1:28:00 1:30:00 1:32:00 1:34:00 1:36:00 1:38:00 1:40:00 1:42:00 1:44:00 1:46:00 1:48:00 1:50:00 1:52:00 1:54:00 1:56:00 1:58:00 2:00:00 2:02:00 2:04:00 2:06:00 2:08:00 2:10:00 2:12:00 2:14:00 2:16:00 2:18:00 2:20:00 2:22:00 2:24:00 TEMPERATUUROC
TIJD (S)
Temperatuur metingen test run 1
K1, lucht onder K2, lucht boven K3, plaat rails K4, lucht uitlaat
2.3.2 Test run 2
The second test has been done in order to understand the behavior of the thermostat and dimmer pack. In this test we have tried to create to different stable temperatures. ( 150 an d 250)
At first the thermostat had a set point of 150. As shown in the graph this set point is exceeded at 13:17.39 but
the temperature keeps increasing till 13:26.19 (170°C) due to the thermal mass of the heating element, combined with the slow reaction of the dimmer pack. The temperature will slowly decrease when the heating element is turned off. By opening the door, and varying in the size of the opening, a temperature drop of 150 °C has been created. Which is not stable.
After this trial, the set point has been changed to 230°C this is 20°C lower as the actual desired set point 250°C
Events
14:17.09 actual temperature 242°C change setpoint 230 to 200
14:19.09 actual temperature 242°C change setpoint 200 to 250
14:22.09 actual temperature 242°C change set point 250 to 305
14:22.09 decrease RPM fan 14:28.09 increase RPM fan
14:28.09 actual temperature 256°C change set point 305 to 230
14:34.09 actual temperature 254°C change set point 230 to 250
14:35.09 actual temperature 254°C change set point 250 to 254
14:39.09 actual temperature 245°C change set point 254 to 260
14:50.09 actual temperature 258°C change set point 260 to 250
14:54.09 actual temperature 257°C placing tray with stone wool sample 15:04.49 actual temperature 256°C remove
tray stone wool sample 15:08.09 remove plug exhaust 15:11.09 de-activation Fan 15:15.09 replacing plug exhaust 15:22.09 re-activating Fan
Main conclusions. The cooling down of the furnace while placing a sample, is significant. The temperature drop an re generating of temperature has a deviation of 17 degrees. The turbulent air created by the fan , create a bigger loss of temperature.
When the fan is turned off or slowed down, the temperatures monitored by K1 and K2 will be more equal. At a higher RPM there is a bigger temperature difference.
2.3.4 Test run 4, 5, 6, and 8
Test run 4 shows the instable temperature without the self tuning function.
Test run 5 has been done with the self tuning function to let the temperature controller know how the furnace works. Test run 6 and shows the heating process of a calibrated temperature controller. Whit the setpont 150°C
Test run 8 shows the heating proses with a stable temperature at 250 °C which is reached after 80 minutes
2.3.3 Test run 7
This test run has been divided in two sections the first part without human interaction. The aim of this test is to understand the self-regulating meganism of the furnace. And the creation of clear data to examine the behavior of the thermocouples. The self-adjusting meganism existing out of a West 6001 temperature controller, and a dimmerpack (dmx512).The set point during this test was 150°C.
Both sections (7A and 7B) are shown in graph.. and graph...
The deviaton of the thermocouples K1/K3 and K2/
K3 are shown in the graph below. When the furnace is at a stable temperature the deviation drops till 2 degrees
11:03:26 11:04:46 11:06:06 11:07:26 11:08:46 11:10:06 11:11:26 11:12:46 11:14:06 11:15:26 11:16:46 11:18:06 11:19:26 11:20:46 11:22:06 11:23:26 11:24:46 11:26:06 11:27:26 11:28:46 11:30:06 11:31:26 11:32:46 11:34:06 11:35:26 11:36:46 11:38:06 11:39:26 11:40:46 11:42:06 11:43:26 11:44:46 11:46:06 11:47:26 11:48:46 11:50:06 11:51:26 11:52:46 11:54:06 TEMPERATUUROC
TIJD (S)
Deviation K1,K3/K2,K3 test run 7A
K1/K3
K2/K3
The graph below shows behavior of the temperature while placing a tray with sample. There is a drop of 20 degrees in the beginning. After three minutes the temperature stabilizes 15 degrees above setpoint.
1.1 Introduction
0,0 50,0 100,0 150,0 200,0 250,0 300,0
12:43:59 12:46:29 12:48:59 12:51:29 12:53:59 12:56:29 12:58:59 13:01:29 13:03:59 13:06:29 13:08:59 13:11:29 13:13:59 13:16:29 13:18:59 13:21:29 13:23:59 13:26:29 13:28:59 13:31:29 13:33:59 13:36:29 13:38:59 13:41:29 13:43:59 13:46:29 13:48:59 13:51:29 13:53:59 13:56:29 13:58:59 14:01:29 14:03:59 14:06:29 14:08:59 14:11:29 14:13:59 14:16:29 14:18:59 14:21:29 14:23:59 14:26:29 14:28:59 14:31:29 14:33:59 14:36:29 14:38:59 14:41:29 14:43:59 14:46:29 14:48:59 14:51:29 14:53:59 14:56:29 14:58:59 15:01:29 15:03:59 15:06:29 15:08:59 15:11:29 15:13:59 15:16:29 15:18:59 15:21:29 15:23:59 15:26:29 TEMPERATUUR (OC)
TIJD (S)