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106 lines
2.9 KiB
ReStructuredText
106 lines
2.9 KiB
ReStructuredText
.. _python-plotting:
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Python Plotting
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===============
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.. note::
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The python plotting API has been changed as of v4.0. The examples shown
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on this page use the new python plotting API. Examples using the old
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python plotting API can be found here :ref:`python-plotting-old`.
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The following example can be used to create a Temperature-Entropy plot for
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propane (R290):
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.. plot::
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:include-source:
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from CoolProp.Plots import PropsPlot
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ts_plot = PropsPlot('R290', 'Ts')
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The following example can be used to create a Pressure-Enthalpy plot for R410A:
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.. plot::
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:include-source:
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from CoolProp.Plots import PropsPlot
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ph_plot = PropsPlot('R410A', 'Ph')
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The available plots are:
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== ====================
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PT Pressure-Temperature
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PD Pressure-Density
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PH Pressure-Enthalpy
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PS Pressure-Entropy
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TD Temperature-Density
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TS Temperatre-Entropy
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HS Enthalpy-Entropy
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== ====================
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The following, more advanced example, can be used to draw lines of constant
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properties for n-Pentane. Note the different ways to invoke the
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:py:func:`CoolProp.Plots.Plots.PropsPlot.draw_isolines` function draw:
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.. plot::
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:include-source:
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from CoolProp.Plots import PropsPlot
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ref_fluid = 'n-Pentane'
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ts_plot = PropsPlot(ref_fluid, 'Ts')
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ts_plot.draw_isolines('Q', [0.3, 0.5, 0.7, 0.8])
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ts_plot.draw_isolines('P', [100, 2000], num=5)
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ts_plot.draw_isolines('D', [2, 600], num=7)
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ts_plot.set_axis_limits([-2, 1.5, 200, 500])
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Some of the commonly used `Matplotlib <http://www.matplotlib.org>`_ functions,
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such as :func:`title`, :func:`xlabel` and :func:`ylabel` have been wrapped in
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the :py:class:`CoolProp.Plots.Plots.PropsPlot` class to make the plotting of
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graphs a little simpler, for example:
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.. plot::
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:include-source:
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from CoolProp.Plots import PropsPlot
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ts_plot = PropsPlot('Water', 'Ts')
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ts_plot.title('Ts Graph for Water')
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ts_plot.xlabel(r's $[{kJ}/{kg K}]$')
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ts_plot.ylabel(r'T $[K]$')
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ts_plot.grid()
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The following two examples show how the :class:`matplotlib.pyplot` functions
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and :class:`matplotlib.pyplot.axes` functions can also be used along side
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the :py:class:`CoolProp.Plots.Plots.PropsPlot` class
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.. plot::
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:include-source:
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from CoolProp.Plots import PropsPlot
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ph_plot = PropsPlot('Water', 'Ph')
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ax = ph_plot.axis
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ax.set_yscale('log')
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ax.text(400, 5500, 'Saturated Liquid', fontsize=15, rotation=40)
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ax.text(2700, 3500, 'Saturated Vapour', fontsize=15, rotation=-100)
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.. plot::
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:include-source:
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from matplotlib import pyplot
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from CoolProp.Plots import PropsPlot
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ref_fluid = 'R600a'
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fig = pyplot.figure(1, figsize=(10, 10), dpi=100)
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for i, gtype in enumerate(['PT', 'PD', 'PS', 'PH', 'TD', 'TS', 'HS']):
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ax = pyplot.subplot(4, 2, i+1)
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if gtype.startswith('P'):
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ax.set_yscale('log')
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props_plot = PropsPlot(ref_fluid, gtype, axis=ax)
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props_plot.title(gtype)
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props_plot._draw_graph()
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pyplot.tight_layout()
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