Tools for launching EES calculation and retrieving results from python
Project description
EES connector
EES connector is a tools developed by the SERG research group of the University of Florence for launching EES calculation and retrieving results from python.
The beta version can be downloaded using PIP:
pip install EES_connector
Once the installation has been completed the user can import the tool and initialize the connector itself.
from EESConnect import EESConnector
with EESConnector() as ees:
# insert your code here
Two important aspects to keep in mind for the initialization:
-
Please use the with statement during the initialization as shown above
-
A file-dialog will appear the first time that the connector is imported asking the user to select the EES executable path (usually it's "C:\EES32\ees.exe"). Once the executable path has been selected, the program keep it in memory in order to avoid new appearance of the file-dialog. The stored executable can be modified calling the following function:
from EESConnect import EESConnector
EESConnector.modify_ees_executable_path()
Finally, you can ask the program to launch EES calculation using the following command:
from EESConnect import EESConnector
from tkinter import filedialog
import tkinter as tk
#select the ees file path
root = tk.Tk()
root.withdraw()
ees_file_path = filedialog.askopenfilename()
with EESConnector() as ees:
ees.ees_file_path = ees_file_path
result = ees.calculate(["air_ha", 110, 1013.25])
print(result[1])
Multiple call are possible passing a dictionaty in the ees.calculate() function in order to speed up the calculation process (the program is loaded on the RAM only once):
from EESConnect import EESConnector
from tkinter import filedialog
import tkinter as tk
#select the ees file path
root = tk.Tk()
root.withdraw()
ees_file_path = filedialog.askopenfilename()
with EESConnector() as ees:
ees.ees_file_path = ees_file_path
result = ees.calculate({
"air_ha": ["air_ha", 300, 1013.25],
"R22": ["R22", 300, 1013.25],
"R236fa": ["R236fa", 300, 1013.25],
"R134a": ["R134a", 300, 1013.25]
})
print(result["R22"][1])
print(result["R236fa"][1])
Please notice that the EES file has to be configured properly in order to work.
Here's an example, that works with the python code described above:
$UnitSystem SI K kPa kJ
$Import 'ees_input.dat' F$ T P
h=enthalpy(F$; T=T; P=P)
s=entropy(F$; T=T; P=P)
$Export 'ees_output.dat' h s
An explaination on how to set EES properly can be found here. Two important things had to be noted:
-
The input defined in the EES file must be consistent with the list provided to the calculation function as an input
-
The input and output file in the EES code must be called "ees_input.dat" and "ees_output.dat" respectively!
-------------------------- !!! THIS IS A BETA VERSION !!! --------------------------
please report any bug or problems in the installation to pietro.ungar@unifi.it
for further information visit: https://tinyurl.com/SERG-3ETool
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