CoolProp calculate error with refprop 9.1

Versions

CoolProp Version: 6.4.1 Operating System and Version: windows 10
Access Method: C# ** refprop ver. 9.1

Additional Information

Hi, there， I got compare this four way to caluate sat Temperature

··· double PPPP = -0.96900795620149793; //1、 this got error, BUT ITS OK // System.ApplicationException:“Pressure to PQ_flash [ 0 Pa] must be in range [0.000171848 Pa, 4.2512e+06 Pa]” string refname = "R290"; CoolProp.PropsSI("T", "P", PPPP * 1000, "Q", 1, refname)

//2、 this got error, BUT ITS OK //System.ApplicationException:“Pressure to PQ_flash [ 0 Pa] must be in range [0.000171848 Pa, 4.2512e+06 Pa]” string refname = "PROPANE"; CoolProp.PropsSI("T", "P", PPPP * 1000, "Q", 1, refname)

//3、this got error, BUT ITS OK // Initialize failed for backend: "REFPROP", fluid: "R290" fractions "[ 1.0000000000 ]"; error: Could not load these fluids: R290 string refname = "REFPROP::290"; CoolProp.PropsSI("T", "P", PPPP * 1000, "Q", 1, refname)

//4、this work ok？？？ amazing //300 string refname = "REFPROP::PROPANE"; CoolProp.PropsSI("T", "P", PPPP * 1000, "Q", 1, refname) ···

Oct 12 '22 12:10 birdol

1), 2), 3) should all yield exception in C# (R290 is not a valid identifier in REFPROP)

should be ok because your input is 300 kPa, if I understand your post correctly.

Message ID: @.***>

Oct 12 '22 14:10 ibell

1、form 1~4 , my input is double PPPP = -0.96900795620149793; *1000， IT‘s -969Pa。This value is expected to be out of range。 2、1）2） got exception in C# ， because out of range。3） because R290 is not a valid identifier。 but 4） it's out put is 300，not input。 why？

Oct 13 '22 01:10 birdol

For 4), it works because your input argument is temperatureCompIn rather than PPP. If I understand correctly, that is.

Message ID: @.***>

Oct 14 '22 01:10 ibell

For 4), it works because your input argument is temperatureCompIn rather than PPP. If I understand correctly, that is. … Message ID: @.***>

I had already edit my post。 there is no temperatureCompIn anymore

Oct 14 '22 03:10 birdol

I think this is a bug in Refprop, you should get an out of range error

Oct 14 '22 03:10 ibell

but when i call refprop in excel，with formula ： =Temperature("PROPANE","PQ","C",-0.000969007956201497,1)

it's show error “#[PQFLSH error 4] one or more inputs are out of range: pressure < 0, P =-0.96901E-03 MPa ”

Oct 14 '22 03:10 birdol

Is this a REFPROP problem? If so, can we close this issue?

Nov 29 '22 22:11 jowr