Error in using refpropm.m in a Matlab function with Simulink

Question

Matthias86 2014-9-17

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https://ww2.mathworks.cn/matlabcentral/answers/155164-error-in-using-refpropm-m-in-a-matlab-function-with-simulink

回答： Haris Hussain 2018-6-14

Hello to everybody, I am trying to write a code in Simulink for modeling a CHP system but, at the moment, I cannot use the refpropm.m inside a MATLAB Function.

The whole code works perfectly in Matlab but, if I put an expression like "y = refpropm('T','p',u,'q',0,'water')" in a Matlab function inside Simulink I receive the following error:

_"This kind of expression is not supported.

Function 'refpropm.m' (#42.9054.9078), line 211, column 29: "@() rp_proto64(BasePath)" Launch diagnostic report."_

I'm using Matlab 2012b win32, but I've installed both versions (win32 and win64).

Can you help me ? Thank you very much Mattia

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Answer 1

Haris Hussain 2018-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/155164-error-in-using-refpropm-m-in-a-matlab-function-with-simulink#answer_324697

Hello Dear

The simplest way to solve the issue is to use Matlab integrated function block and use the following syntax for defining the function refpropm('H','T', u(1),'P',u(2),'water')

i.e. calculating the enthalpy for water for the given values of temperature and Pressure. u(1) is the input value/values for Temperature and u(2) for pressure.