What are the units? 234.5 ...what?? Looking at what the units are, will basically tell you exactly what the property is related to. Nonetheless, you cannot possibly directly determine what the temperature change of something as physically and geometrically complex as a connector, merely by factoring in what its resistance change is. Among other things, the solution is extremely non-linear and iterative. Changing resistance will generate more heat, which will increase temperature, which will generate even more heat ....and on and on! Add this to the fact the resistance coefficient with temperature is itself non-linear, and you can see how this complicates things further. The final temperature that the "system" stabilizes at, is reached when the logarithmically increasing (i.e. also very non-linear) heat transfer to the environment caused by increasing temperature, balances increased heat being generated. To reach a solution, you need to iterate your calculations, where the results of one calculation are plugged as variables into the next iteration. Typically a thermal analysis program will require several hundred iteration before a converged solution results. Bob Wilson TIR Systems Ltd. Vancouver. -----Original Message----- From: Ned Devine [mailto:[email protected]] Sent: May 10, 2002 8:29 AM To: [email protected] Subject: Constant for Change of Resistance formula. Hi, Does any one know how the constant for CoR formula was determined? I know the K is 234.5 for copper and 226 for aluminum, but what property is this related to? I am trying to determine the change in temperature of a connector, based on the change of resistance. The connector contacts are made of brass.
Thanks Ned Ned Devine Program Manager Entela, Inc. 3033 Madison Ave. SE Grand Rapids, MI 49548 1 616 248 9671 Phone 1 616 574 9752 Fax [email protected] e-mail Entela, Inc. A Certified Woman Owned Business www.entela.com
