A bi-quadratic requires a 7x7 matrix (number of coefficients + 1). Didn't the error file have a warning? Try adding another data point in your table.
X = a + b * T1 + c * T1^2 + d * T2 + e * T2^2 + f * T1*T2
# of data points = 6 (f) + 1 = 7
On 6/9/2011 6:02 AM, dgerome06 wrote:
Hi,
i would like to create a biquadratic curve thanks to datas extracted from the literature. I used a Performance Table Object with two independent variables. I looked at the example file LookUp Tables and have done something similar.
My problem is that the simulation crashes when i add this object into my idf file. The example idf file doesn't crash.
I have tried to change the interpolation method without any success.
I gave 6 * 6 data pairs.
Units for X and Y are temperature.
Unit for Output is dimensionless.
I put temperature in Celsius but i put only positive temperatures.
Is it necessary to put Kelvin temperatures??
I hope that someone could help me.
Many thanks.
Jerome DEROCHE
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