I have completed uncertainty analysis for my heat exchanger calorimetric lab.but I am not sure the calculation of enthalpy ( it is required for Q=mr*deltaH) due to ref.prop program. Normally my main equation is U=cv*dT+P*v and I have calculated uncertainity according to temperature and pressure sensor and I admitted constant the value of specific heat and specific weight but these values have a uncertainty due to Refprop uncertanities. I am not sure whether to add this uncertainty. I would like to learn your opinions and advices.
The maximum possible uncertainty is estimated from the minimum value of the measured quantity and the accuracy of the measuring system.
Every quantity in the respective equation has a certain uncertainty which has to be known or must be estimated to calculate the uncertainty of the resulting quantity. In addition there are different statistical methods for the calculation procedure. The maximum uncertainty is -unfortunately- the value you have to calculate for this purpose. For details see Chapter 6.5 in St.M.Sarge et al.: "Calorimetry; Fundamentals Instrumentation and Applications" Wiley-VCH Weinheim Germany (2014) an References cited there.
I'd say you should consider the so-called laws of error propagation, see http://en.wikipedia.org/wiki/Propagation_of_uncertainty
Cheers,
Petra
Hello.
I wanted to refer to this site. I see it is done by Petra Roosen.
Best.
Dear Ergin,
I have the same problem as you. Have you have the answer yet?
Thank you very much.
Atit
You may want to check this out
Lira I., “Evaluating the Measurement Uncertainty-Fundamental and Practical Guidance”, Institute of physics publishing, USA, 2002.
- Badges
- Science topic
- Similar topics
- Engineering
- Thermal Engineering