No doubt it could stand improvements for sure, Jeff.

  There are four DT's I employ in the cooling equations.  Change in  air temperature across the radiator, change in air temperature across the oil cooler and change in fluid temperature of the coolant and oil as they flow through their heat exchanger.    I have heard of Air DT across the radiator ranging from 50-100F,  I am currently using a DT of 70F , but I know that Tracy has reported a DT of  100F.   I am also using DT of 70F for the oil cooler and that is probably too high.    For both fluid DTs, I am using 16F.

IF anyone has reference material or sources that could help me refine those figures - it would undoubtedly improve the cooling section.

As Jeff pointed out for the cooling section there is no input for OAT although there is for the power section.  My initial thoughts would be to pick

some OAT and I'm thinking of 59F (SL standard day temp) as a nominal mid point of  DT.  Then if OAT is above that DT, then to simply subtract the difference between OAT and 59F and reduce the air DT across the radiator by that amount.  Conversely if OAT is below 59F then to add that DT to the 70F I am currently using. 

By increasing the DT factor more heat is transferred (better cooling) by reducing the DT factor less heat is transferred (worst cooling)

IF anyone has reference material or sources that could help me refine those figures - it would undoubtedly improve the cooling section.

Ed

Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104