Adding a new incompressible fluid

[StartCodeLearner]

Hello, everyone, I have a question about adding an incompressible fluid. I have tried various methods, but still haven't worked not.
1)Try reading from a json file, modify it then reload them, following the instructions: http://www.coolprop.org/coolprop/HighLevelAPI.html#adding-fluids
But errors for these two functions:
jj = CP.get_fluid_param_string('INCOMP::NaK', 'json')
AS = CP.AbstractState('HEOS', 'INCOMP::NaK')

2. I have made the JSON file for the new fluid following the instructions: http://www.coolprop.org/fluid_properties/Incompressibles.html#adding-new-fluids
   How to add it to the code without recompiling the source code

3. Another question about the CP.set_config_bool(CP.DONT_CHECK_PROPERTY_LIMITS, True)
   The config file has been changed but it doesn't work for incompressible fluids like INCOMP::NaK.

Thanks in advance.

[ibell]

1. The adding of fluids in that way is only available for the other kinds of models, not the incompressible ones. In your example, it should read: CP.AbstractState('INCOMP','NaK') . 'INCOMP' is the backend and 'NaK' is the fluid name
2. You need to recompile (I think, right @jowr)?
3. Can you show a complete runnable example?

[StartCodeLearner]

hello, ibell, thanks for your help. The Tin for NaK (a kind of salt) is 573.15 K. I want to extend the calculation below to 290C.
Here is the code following your previous answers

import json
import CoolProp.CoolProp as CP

fluid='INCOMP::NaK'
#load the state
AS=CP.AbstractState('INCOMP','NaK')
CP.set_config_bool(CP.OVERWRITE_FLUIDS, True)

#Get the fluid information in JSON format
#for loaded fluid
jbase = json.loads(AS.fluid_param_string("JSON"))[0]
jbase["Tmin"] = 553.13 #set the Tin=553.15 K
CP.add_fluids_as_JSON('INCOMP', json.dumps(jbase))

#Here is the Test
density_at_290C = CP.PropsSI('D', 'P', 0.1E6, 'T', 290 + 273.15, 'INCOMP::NaK')
print(f'density_at_290C={density_at_290C}')

[ianhbell]

So that's your desired code, but it doesn't work as far as I can tell, right? Because partly at least JSON is not a valid option for fluid_param_string for the INCOMP backend

[StartCodeLearner]

Yes.That's right, Is there any simple way to add or modify new incomp fluid without compilation?

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[ibell]

Currently, no. But if you wanted to write a PR to add this capability it would be welcomed.