Solving the Enthalpy Equation in C++

[ZachGriffin]

Hi guys,

I'm trying to implement the enthalpy equation in C++ converting it from an excel macro I found on this forum. I'm having a problem with the results which I think is as a result of having the incorrect order of operations. Can somebody help with the order of operations for this with brackets? Any help is much appreciated.

The enthalpy equation:

H/(R*T) = A1 + A2*T/2 + A3*T^2/3 + A4*T^3/4 + A5*T^4/5 + A6/T

The macro equation:

H = H + W * r * t * (a1 + t * a2 / 2 + t ^ 2 * a3 / 3 + t ^ 3 * a4 / 4 + t ^ 4 * a5 / 5 + a6 / t)

My Implementation:

ocpcOxidantEnthalpy += w * universalGasConstant * ocpcOxidantTemperature * (fuelContainer.a1 + ocpcOxidantTemperature * fuelContainer.a2 / 2 + Math::Pow(ocpcOxidantTemperature,2) * fuelContainer.a3 / 3 + Math::Pow(ocpcOxidantTemperature,3) * fuelContainer.a4 / 4 + Math::Pow(ocpcOxidantTemperature,4) * fuelContainer.a5 / 5 + fuelContainer.a6 / ocpcOxidantTemperature);

 

[Mike222]

I think that power is fractional 2/3, 3/4, 4/5.
Could you please provide the values of A1 to A6 you are using?
Regards,
Mike.

 

[astrokreng]

Hi there, it looks like you're on the right track with your implementation of the enthalpy equation in C++. However, it's difficult to pinpoint the exact issue without seeing the data you are using and the specific problem you are having with the results. Generally, it's important to make sure that you are using the correct units and that your variables are defined properly. As for the order of operations, it looks like you have correctly followed the formula provided in the macro equation. Just make sure to double check your calculations and units to ensure accuracy. If you are still having trouble, it may be helpful to consult with a colleague or seek assistance from a programming expert. Good luck with your project!