YES! IP! Small issue though

[eloneill]

I'm super pumped to see that this has been ported over with IP usage. As a mechanical engineer without much debugging experience, I'm running this code and getting the following issue. Am I doing something wrong?

Thanks for the work getting this to work with IP units.

%matplotlib inline

%config InlineBackend.figure_format = 'retina'

import matplotlib.pyplot as plt

​

from psychrochart import PsychroChart, load_config

​

chart_ashrae_style = PsychroChart(use_unit_system_si=False)

ax = chart_ashrae_style.plot()

ax.get_figure()

​

WARNING:root:[IP units mode] ENABLED
ERROR:root:ENTHALPHY CONVERGENCE ERROR: No convergence error after 100 iterations! Last value: 101.8643583901623, ∆: 0.125. Objective: 75, iter_value: 75.18484966677528

---

ValueError Traceback (most recent call last)
in
5 from psychrochart import PsychroChart, load_config
6
----> 7 chart_ashrae_style = PsychroChart(use_unit_system_si=False)
8 ax = chart_ashrae_style.plot()
9 ax.get_figure()

~\AppData\Roaming\Python\Python37\site-packages\psychrochart\chart.py in init(self, styles, zones_file, use_unit_system_si)
86 self._handlers_annotations: List = []
87
---> 88 self._make_chart_data(styles, zones_file)
89
90 def repr(self) -> str:

~\AppData\Roaming\Python\Python37\site-packages\psychrochart\chart.py in _make_chart_data(self, styles, zones_file)
213 label_loc=self.chart_params.get("constant_v_labels_loc", 1.0),
214 family_label=self.chart_params["constant_v_label"],
--> 215 saturation_curve=self.saturation.curves[0],
216 )
217

~\AppData\Roaming\Python\Python37\site-packages\psychrochart\chartdata.py in make_constant_specific_volume_lines(w_humidity_ratio_min, pressure, vol_values, v_label_values, style, label_loc, family_label, saturation_curve)
310 vol_values,
311 lambda *x: t_sat_interpolator(x[0]),
--> 312 lambda x: GetMoistAirVolume(
313 x, GetHumRatioFromVapPres(GetSatVapPres(x), pressure), pressure,
314 ),

~\AppData\Roaming\Python\Python37\site-packages\psychrochart\util.py in solve_curves_with_iteration(family_name, objective_values, func_init, func_eval)
178 func_eval=func_eval,
179 initial_increment=initial_increment,
--> 180 precision=precision,
181 )
182 except AssertionError as exc: # pragma: no cover

~\AppData\Roaming\Python\Python37\site-packages\psychrochart\util.py in _iter_solver(initial_value, objective_value, func_eval, initial_increment, num_iters_max, precision)
121 num_iter = 0
122 value_calc = initial_value.copy()
--> 123 error = objective_value - func_eval(initial_value)
124 while abs(error) > precision and num_iter < num_iters_max:
125 iteration_value = func_eval(value_calc)

~\AppData\Roaming\Python\Python37\site-packages\psychrochart\chartdata.py in (x)
311 lambda *x: t_sat_interpolator(x[0]),
312 lambda x: GetMoistAirVolume(
--> 313 x, GetHumRatioFromVapPres(GetSatVapPres(x), pressure), pressure,
314 ),
315 )

~\AppData\Roaming\Python\Python37\site-packages\psychrolib.py in GetSatVapPres(TDryBulb)
1022 if isIP():
1023 if (TDryBulb < -148 or TDryBulb > 392):
-> 1024 raise ValueError("Dry bulb temperature must be in range [-148, 392]°F")
1025
1026 T = GetTRankineFromTFahrenheit(TDryBulb)

ValueError: Dry bulb temperature must be in range [-148, 392]°F

[azogue]

Hi @eloneill,

IP usage is too new, sorry :) I need to take some time to polish the plot logic so those errors get better treatment.

Anyway, I think your current problem is because you changed the unit system but the chart is working with plot limits adequate only for SI. Try to change this line:

chart_ashrae_style = PsychroChart(use_unit_system_si=False)

to

chart_ashrae_style = PsychroChart(styles="ashrae_ip", use_unit_system_si=False)

By loading another predefined style (the only one tested with IP right now, btw), the plot limits change, and it should work ok.