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Team:Cornell/project/drylab/modeling
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| - | With the temperature sensor and heating circuit placed inside the incubation chamber, the rate of heating when full power (100% PWM) was applied and the rate of cooling when the heating circuit switched off was graphed in Figure 1. Some initial calibration runs were then performed as we fine tuned our heating algorithm. | + | With the temperature sensor and heating circuit placed inside the incubation chamber, the rate of heating when full power (100% PWM) was applied and the rate of cooling when the heating circuit switched off was graphed in Figure 1. Some initial calibration runs were then performed as we fine tuned our heating algorithm. |
| - | <img src="https://static.igem.org/mediawiki/2013/2/23/Fig1heat%26cool.png" alt="heat&cool" > <br> | + | <img src="https://static.igem.org/mediawiki/2013/2/23/Fig1heat%26cool.png" alt="heat&cool" style="max-height:none"> Figure 1: Heating and Cooling curves<br> |
As the optimal temperature for fungi growth is 27°C, we calculated the difference between the measured temperature and optimal temperature. When the difference is more than 10°C cooler than optimal ie. 17°C, maximum heat is applied so as to quickly heat the chamber. As the temperature difference decreases, the duty cycle decreases proportionally until the temperature is at 27°C. Once the temperature increases beyond the optimal, the heating circuit shuts off.<br><br> | As the optimal temperature for fungi growth is 27°C, we calculated the difference between the measured temperature and optimal temperature. When the difference is more than 10°C cooler than optimal ie. 17°C, maximum heat is applied so as to quickly heat the chamber. As the temperature difference decreases, the duty cycle decreases proportionally until the temperature is at 27°C. Once the temperature increases beyond the optimal, the heating circuit shuts off.<br><br> | ||
Revision as of 02:37, 28 September 2013
Modeling
With the temperature sensor and heating circuit placed inside the incubation chamber, the rate of heating when full power (100% PWM) was applied and the rate of cooling when the heating circuit switched off was graphed in Figure 1. Some initial calibration runs were then performed as we fine tuned our heating algorithm.
Figure 1: Heating and Cooling curves
As the optimal temperature for fungi growth is 27°C, we calculated the difference between the measured temperature and optimal temperature. When the difference is more than 10°C cooler than optimal ie. 17°C, maximum heat is applied so as to quickly heat the chamber. As the temperature difference decreases, the duty cycle decreases proportionally until the temperature is at 27°C. Once the temperature increases beyond the optimal, the heating circuit shuts off.
As seen in Figure 2, From room temperature (24°C), it takes less than 5 minutes for the incubation chamber to reach optimal temperature (27°C) and it remains stable.
Figure 1: Heating and Cooling curvesAs the optimal temperature for fungi growth is 27°C, we calculated the difference between the measured temperature and optimal temperature. When the difference is more than 10°C cooler than optimal ie. 17°C, maximum heat is applied so as to quickly heat the chamber. As the temperature difference decreases, the duty cycle decreases proportionally until the temperature is at 27°C. Once the temperature increases beyond the optimal, the heating circuit shuts off.
As seen in Figure 2, From room temperature (24°C), it takes less than 5 minutes for the incubation chamber to reach optimal temperature (27°C) and it remains stable.
