2.52.19 release; fix multistage mixer settler capital cost bug; add tutorial

Author: yoelcortes

biosteam/__init__.py

@@ -13,7 +13,7 @@
 
 """
 from __future__ import annotations
-__version__ = '2.52.18'
+__version__ = '2.52.19'
 
 #: Chemical engineering plant cost index (defaults to 567.5 at 2017).
 CE: float = 567.5 

biosteam/units/liquid_liquid_extraction.py

@@ -1188,8 +1188,9 @@ class MultiStageMixerSettlers(MultiStageEquilibrium):
     
     """
     _side_draw_names = ('extract_side_draws', 'raffinate_side_draws')
+    default_algorithms = ('phenomena',)
     _units = MixerSettler._units
-    default_maxiter = 20
+    default_maxiter = 50
 
     def _init(self, N_stages, feed_stages=None, extract_side_draws=None, 
               raffinate_side_draws=None, partition_data=None, top_chemical=None,  
@@ -1268,8 +1269,10 @@ def _cost(self):
         N_stages = self.N_stages
         mixer = self.mixer
         settler = self.settler
-        mixer._cost()
-        settler._cost()
+        for u in (mixer, settler):
+            u._setup()
+            u._cost()
+            u._summary()
         self.power_utility.copy_like(mixer.power_utility)
         self.power_utility.scale(N_stages)
         purchase_costs = self.purchase_costs
@@ -1279,11 +1282,5 @@ def _cost(self):
         baseline_purchase_costs['Mixers and agitators'] = N_stages * mixer.purchase_cost
         baseline_purchase_costs['Settlers'] = N_stages * settler.purchase_cost
         installed_costs = self.installed_costs
-        installed_costs['Mixers and agitators'] = N_stages * mixer.purchase_cost
-        installed_costs['Settlers'] = N_stages * settler.purchase_cost
-        
-    @property
-    def installed_cost(self):
-        N_stages = self.N_stages
-        return N_stages * (self.mixer.installed_cost + self.settler.installed_cost)
-        
+        installed_costs['Mixers and agitators'] = N_stages * mixer.installed_cost
+        installed_costs['Settlers'] = N_stages * settler.installed_cost

biosteam/units/stage.py

@@ -2245,6 +2245,9 @@ def _init(self,
             partition_stage = False
         self.N_stages = N_stages
         if not isinstance(P, Iterable): P = [P] * N_stages 
+        if len(P) != N_stages: 
+            dP = P[-1] - P[0] / N_stages
+            P = [P[0] + i * dP for i in range(N_stages)]
         self.multi_stream = tmo.MultiStream(None, P=P[N_stages // 2], phases=phases, thermo=self.thermo)
         self.P = np.array(P)
         self.T = T

docs/tutorial/Mixer_settlers.ipynb

@@ -11,7 +11,7 @@
     name='biosteam',
     packages=['biosteam'],
     license='MIT',
-    version='2.52.18',
+    version='2.52.19',
     description='The Biorefinery Simulation and Techno-Economic Analysis Modules',
     long_description=open('README.rst', encoding='utf-8').read(),
     author='Yoel Cortes-Pena',