Winning the chili cook-off

摘要

A COMMON MISTAKE MADE WHEN SPECIFYING a heater or its components is not fully appreciating interactions.Interactions are at two levels:between the components and with the environment.Some interactions can be complex.For example,engineers often request heaters with very specific temperature uniformity;power dissipation is an attribute of a heater not uniformity.Temperature uniformity is a characteristic of the interaction between the heater and the environment.Similarly,when it is discovered that a new thermal system design doesn't control temperature within desired tolerances its often concluded that the accuracy or precision of the temperature control unit must be the problem.What is more likely is that the sensor or heater response is unstable due to mechanical fit or related assembly tolerance problems.