This simulation shows about desired temperature is 25 degrees Celsius (goal seeking) and actual temperature is 100 to -10 degrees Celsius for time period of 50 minutes and adjusting is 10 percent. From temperature at 100, 80, 50 degrees Celsius, these line will go down to desire temperature at 25 degrees Celsius. And temperature at 20, 0, -10 degrees Celsius, these line will go up to desire temperature at 25 degrees Celsius. However, in exactly the temperature is not met at 25 degrees Celsius to fit in 50 minutes.