HeatExchangerNetwork#

class HeatExchangerNetwork(ID='', T_min_app=5.0, units=None, ignored=None, Qmin=0.001, force_ideal_thermo=False, cache_network=False, avoid_recycle=False, acceptable_energy_balance_error=None, replace_unit_heat_utilities=False)[source]#

Create a HeatExchangerNetwork object that will perform a pinch analysis on the entire system’s heating and cooling utility objects. The heat exchanger network reduces the heating and cooling utility requirements of the system and may add additional capital cost.

Parameters:

ID (str) – Unique name for the facility.
T_min_app (float) – Minimum approach temperature observed during synthesis of heat exchanger network.
units (Iterable[Unit], optional) – All unit operations available to the heat exchanger network. Defaults to all unit operations in the system.

Notes

Original system stream and heat exchanger objects are preserved. All stream copies and new HX objects can be found in a newly created flowsheet ‘<sys>_HXN’ where <sys> is the name of the system associated to the HeatExchangerNetwork object.

References

Examples

>>> import biosteam as bst
>>> bst.settings.set_thermo(['Water', 'Methanol', 'Glycerol'])
>>> feed1 = bst.Stream('feed1', flow=(8000, 100, 25))
>>> feed2 = bst.Stream('feed2', flow=(10000, 1000, 10))
>>> D1 = bst.ShortcutColumn('D1', ins=feed1,
...                     outs=('distillate', 'bottoms_product'),
...                     LHK=('Methanol', 'Water'),
...                     y_top=0.99, x_bot=0.01, k=2,
...                     is_divided=True)
>>> D1_H1 = bst.HXutility('D1_H1', ins = D1.outs[1], T = 300)
>>> D1_H2 = bst.HXutility('D1_H2', ins = D1.outs[0], T = 300)
>>> F1 = bst.Flash('F1', ins=feed2,
...                outs=('vapor', 'liquid'), V = 0.9, P = 101325)
>>> HXN = bst.HeatExchangerNetwork('HXN', T_min_app = 5.)
>>> sys = bst.System.from_units('sys', units=[D1, D1_H1, D1_H2, F1, HXN])
>>> sys.simulate()
>>> # See all results
>>> round(HXN.actual_heat_util_load/HXN.original_heat_util_load, 2)
0.82
>>> abs(HXN.energy_balance_percent_error) < 0.01
True
>>> HXN.stream_life_cycles
[<StreamLifeCycle: Stream_0, cold
    life_cycle = [
            <LifeStage: <HXprocess: HX_0_2_hs>, H_in = 5.75e+06 kJ, H_out = 4.25e+07 kJ>
            <LifeStage: <HXutility: Util_0_hs>, H_in = 4.25e+07 kJ, H_out = 7.09e+07 kJ>
    ]>, <StreamLifeCycle: Stream_1, cold
    life_cycle = [
            <LifeStage: <HXprocess: HX_1_4_hs>, H_in = 0 kJ, H_out = 3.34e+04 kJ>
            <LifeStage: <HXprocess: HX_1_2_hs>, H_in = 3.34e+04 kJ, H_out = 5.39e+06 kJ>
            <LifeStage: <HXprocess: HX_1_3_hs>, H_in = 5.39e+06 kJ, H_out = 2.46e+07 kJ>
            <LifeStage: <HXutility: Util_1_hs>, H_in = 2.46e+07 kJ, H_out = 2.79e+08 kJ>
    ]>, <StreamLifeCycle: Stream_2, hot
    life_cycle = [
            <LifeStage: <HXprocess: HX_0_2_hs>, H_in = 4.52e+07 kJ, H_out = 8.46e+06 kJ>
            <LifeStage: <HXprocess: HX_1_2_hs>, H_in = 8.46e+06 kJ, H_out = 3.1e+06 kJ>
            <LifeStage: <HXutility: Util_2_cs>, H_in = 3.1e+06 kJ, H_out = 1.14e+06 kJ>
    ]>, <StreamLifeCycle: Stream_3, hot
    life_cycle = [
            <LifeStage: <HXprocess: HX_1_3_hs>, H_in = 2.18e+07 kJ, H_out = 2.6e+06 kJ>
            <LifeStage: <HXutility: Util_3_cs>, H_in = 2.6e+06 kJ, H_out = 2.6e+06 kJ>
    ]>, <StreamLifeCycle: Stream_4, hot
    life_cycle = [
            <LifeStage: <HXprocess: HX_1_4_hs>, H_in = 7.51e+05 kJ, H_out = 7.18e+05 kJ>
            <LifeStage: <HXutility: Util_4_cs>, H_in = 7.18e+05 kJ, H_out = 7.18e+05 kJ>
    ]>]

line: str = 'Heat exchanger network'#: class-attribute Name denoting the type of Unit class. Defaults to the class name of the first child class

run()#: Run mass and energy balance. This method also runs specifications user defined specifications unless it is being run within a specification (to avoid infinite loops).

See also

_run, specifications, add_specification, add_bounded_numerical_specification