Figure 6
The cover temperature is controlled with successively increasing or decreasing step temperatures. The responses of Peltier device’s temperature, water pump’s voltage input, and temperature of the cover surface are monitored. The cover temperature is heated by 3 °C (5 °C in the end) until 51 °C (left figure) and cooled by 1 °C until 17 °C (right figure), keeping each temperature command for 60 s. Each response speed is less than 10 s after completely heating/cooling the circulating water.
