Vacuum costing and valve graphic fix

biosteam/_graphics.py

@@ -309,6 +309,7 @@ def tailor_valve_node(node, unit): # pragma: no coverage
         # TODO: Remove this fallback once fix for valve svg output in digraph.py
         node.clear()
         node.update(box_node)
+        node['name'] = ''
         node['fillcolor'] = bst.preferences.unit_color
         node['fontcolor'] = bst.preferences.unit_label_color
         node['color'] = bst.preferences.unit_periphery_color

biosteam/_system.py

@@ -1861,9 +1861,10 @@ def algorithm(self, algorithm):
     @property
     def isdynamic(self) -> bool:
         """Whether the system contains any dynamic Unit."""
-        try:
-            return self._isdynamic
-        except:
+        if hasattr(self, '_isdynamic'):
+            if self._isdynamic is not None:
+                return self._isdynamic
+        else:
             isdynamic = False
             for i in self.units:
                 if i._isdynamic: 

biosteam/units/_pump.py

@@ -214,7 +214,8 @@ def _design(self):
                     N = max(ceil(q_i / 1500), N)
                     pump_type = 'Gear'
                 elif (head_i <= 20000
-                      and power_i <= 200
+                      # and power_i <= 200
+                      and 1 <= power_i <= 200
                       and nu <= 0.01):
                     N = max(ceil(q_i / 500), N)
                     pump_type = 'MeteringPlunger'
@@ -246,7 +247,6 @@ def _cost(self):
         h = Design['Head']
         p = Design['Power']
         I = bst.CE/567
-
         # TODO: Add cost equation for small pumps
         # Head and flow rate is too small, so make conservative estimate on cost
         if q < 50: q = 50

biosteam/units/design_tools/vacuum.py

@@ -8,7 +8,12 @@
 .. [1] Seider, W. D.; Lewin, D. R.; Seader, J. D.; Widagdo, S.; Gani, R.;
     Ng, M. K. Cost Accounting and Capital Cost Estimation.
     In Product and Process Design Principles; Wiley, 2017; pp 426–485.
-
+.. [2] Amazon. Robinair (15115) VacuMaster Single Stage Vacuum Pump - Single-Stage, 1.5 CFM. 
+    https://www.amazon.com/Robinair-15115-VacuMaster-Single-Vacuum/dp/B005CO9FDW?ref_=ast_sto_dp.
+    Accessed on 09/28/2023.
+.. [3] Amazon. Robinair (15300) VacuMaster Economy Vacuum Pump - 2-Stage, 3 CFM.
+    https://www.amazon.com/Robinair-15300-VacuMaster-Economy-Vacuum/dp/B000O1E5UQ?ref_=ast_sto_dp
+    Accessed on 09/28/2023.
 
 """
 from numpy import log as ln
@@ -26,6 +31,7 @@
 
 # System types of vacuum systems
 # Volumetric flowrate ranges, (cfm) and lower limit of suction (torr)
+# Rotary vane pumps based on ref. [2], [3]
 _steamjet_ejectors = {
     'One stage':               ((10, 1000000), 100),
     'Two stage':               ((10, 1000000),  15),
@@ -38,11 +44,20 @@
     'Three stage rotary lobe': ((60,     240), 1.5),
     'Three stage claw':        ((60,     270), 0.3),
     'Screw compressor':        ((50,    1400), 0.1)}
+_rotary_vane = {
+    'One stage':               ((0,     1.51), 0.115),
+    'Two stage':               ((1.5,   3.01), 0.035)}
 
 _default_vacuum_systems = {'Liquid-ring pump': _liquid_ring,
                            'Steam-jet ejector': _steamjet_ejectors,
-                           'Dry-vacuum pump': _dry_vacuum}
-
+                           'Dry-vacuum pump': _dry_vacuum,
+                           'Rotary-vane pump': _rotary_vane}
+
+_default_rotary_vane_work_cost = {
+    'One stage': (1/5 * 0.7457, 127*1.08), # hp to kW; 2023 USD (including tax & shipping)
+    'Two stage': (1/3 * 0.7457, 248*1.08)
+    }
+
 _air_density = 1.2041 # kg/m3 dry air
 
 # %% Calculate vacuum system requirements
@@ -75,11 +90,12 @@ def compute_vacuum_system_power_and_cost(
     else:
         F_vol_air = F_mass_air = 0
     F_vol_cfm = 0.5886*F_vol + F_vol_air
-    if F_vol_cfm < 3.01:
-        factor = 3.01/F_vol_cfm
-        F_vol_cfm = 3.01
-    else:
-        factor = 1
+    # if F_vol_cfm < 3.01:
+        # factor = 3.01/F_vol_cfm
+        # F_vol_cfm = 3.01
+    # else:
+    #     factor = 1
+    factor = 1
     F_mass_kgph = (F_mass + 0.4536*F_mass_air)*factor # kg/hr
     F_mass_lbph = 2.205 * F_mass_kgph
     vacuum_systems = get_prefered_vacuum_systems(vacuum_system_preference)
@@ -92,6 +108,12 @@ def compute_vacuum_system_power_and_cost(
         steam = 0.41631 * F_mass_kgph # [kmol/hr] 7.5 weight steam/ weight gas
         work = 0.
         has_condenser = grade != 'One stage'
+    elif name == 'Rotary-vane pump':
+        has_condenser = False
+        agent = None
+        steam = 0.
+        N = 1
+        work = _default_rotary_vane_work_cost[grade][0]
     else:
         has_condenser = False
         agent = None
@@ -251,5 +273,10 @@ def calculate_vacuum_cost(vacuum_sys, grade, F_mass_lbph, F_vol_cfm, P_suction):
         elif grade == 'Screw compressor':
             Cp = 10875*S**0.38
         Cost = Cp
+    elif vacuum_sys == 'Rotary-vane pump':
+        Cost = _default_rotary_vane_work_cost[grade][1] / 708. * 567.   # !!! 708 is the 2021 CEPCI, need to be updated to 2023 CEPCI
     return Cost
 
+
+
+

biosteam/utils/scope.py

@@ -32,7 +32,7 @@ class Scope():
 
     See Also
     --------
-    `pandas.MultiIndex <https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.MultiIndex.html>`
+    `pandas.MultiIndex <https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.MultiIndex.html>`_
 
     """    
     def __init__(self, subject, variables, header=None, **kwargs):
@@ -59,6 +59,7 @@ def __call__(self, t):
             log.append(self.getter(var))
 
     def reset_cache(self):
+        """Clears all recorded data."""
         self._ts = []
         self._record = {var:[] for var in self._record.keys()}
 
@@ -81,7 +82,7 @@ def _n_cols(self, make_header=False):
                 if isa(data, (float, int, str)): ni = 1
                 else: ni = len(data)
                 n.append(ni)
-                names += ['f{var}_i' for i in range(ni)]
+                names += [f'{var}_{i}' for i in range(ni)]
             return n, names
         else:
             for var in self._record.keys():
@@ -151,12 +152,12 @@ class SystemScope():
     interpolator : callable, optional
         An interpolation method that takes in time-series data and returns
         an interpolant. Used to export the data at certain time points. 
-        When none specified, will use `scipy.interpolate.InterpolatedUnivariateSpline` 
+        When none specified, will use :class:`scipy.interpolate.InterpolatedUnivariateSpline` 
         with k=1 (i.e., linear) and will raise error when trying to extrapolate.
 
     See Also
     --------
-    `scipy.interpolate.InterpolatedUnivariateSpline <https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.InterpolatedUnivariateSpline.html>`
+    `scipy.interpolate.InterpolatedUnivariateSpline <https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.InterpolatedUnivariateSpline.html>`_
     """
     def __init__(self, system, *subjects, interpolator=None, **kwargs):
         self.system = system
@@ -178,6 +179,7 @@ def __call__(self, t):
             s.scope(t)
 
     def reset_cache(self):
+        '''Clears all recorded data.'''
         self._ts = []
         self.sol = None
         for s in self.subjects:

requirements_test.txt

@@ -4,4 +4,4 @@ nbval
 SALib
 pyglet
 ipykernel
-CoolProp
+CoolProp

tests/test_vacuum.py

@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# BioSTEAM: The Biorefinery Simulation and Techno-Economic Analysis Modules
+# Copyright (C) 2020-2023, Yoel Cortes-Pena <[email protected]>
+# 
+# This module is under the UIUC open-source license. See 
+# github.com/BioSTEAMDevelopmentGroup/biosteam/blob/master/LICENSE.txt
+# for license details.
+"""
+"""
+
+import pytest
+import biosteam as bst
+
+def test_rotary_vane_vacuum_pump():
+
+    bst.settings.set_thermo(['Water', 'CH4'])
+    gas = bst.Stream('gas', CH4=2, Water=0.1)
+    vac = bst.VacuumSystem(F_mass=gas.F_mass, F_vol=gas.F_vol, 
+        P_suction=31325., vessel_volume=1.9e-3)
+    assert "Rotary-vane pump, one stage" in vac.baseline_purchase_costs
+    #!!! TODO: add test to purchase cost after updating CEPCI
+
+    vac = bst.VacuumSystem(F_mass=gas.F_mass*10, F_vol=gas.F_vol*10, 
+        P_suction=31325., vessel_volume=1.9e-3)
+    assert "Rotary-vane pump, two stage" in vac.baseline_purchase_costs
+    pass
+
+if __name__ == '__main__':
+    test_rotary_vane_vacuum_pump()
+
+