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ThermophysicalData

  

PsychrometricChart

  

Create a psychrometric chart to extract and visualize thermophysical properties of humid air

 

Calling Sequence

Parameters

Options

Description

Examples

Compatibility

Calling Sequence

PsychrometricChart()

PsychrometricChart(opts, plotopts)

Parameters

opts

-

(optional) equations of the form keyword = value, described below

plotopts

-

(optional) plot options

Options

• 

temperature = range 

  

The range of dry bulb temperature values to be used for the horizontal axis (default: 10degC..55degC).

• 

maxhumidityratio = numeric 

  

The maximal value of the humidity ratio to be used for the vertical axis (default: 0.035). The axis always starts at 0.

• 

pressure = numeric 

  

The pressure value to use for the entire chart. Default value: 101325Pa.

• 

specificvolume = true, false, or a list of values 

  

Whether to include lines of constant specific volume per dry air, and, if so, at what values. The default is about five lines spaced evenly over the range present in the chart.

• 

wetbulbtemperature = true, false, or a list of values 

  

Whether to include lines of constant wet bulb temperature, and, if so, at what values. The default is lines for about 14 values spaced evenly over the given dry bulb temperature range, not all of which actually occur in the chart.

• 

saturationenthalpy = true, false, or a list of values

  

Whether to include lines of constant saturation enthalpy, and, if so, at what values. The default is at 0,20,40,...,120Jgdry air.

• 

legends = a set or list of the names specificvolume, wetbulbtemperature, relativehumidity, and saturationenthalpy 

  

The curves to include in the legend. By default, all curves are included in the legend.

• 

numbers: set or list of the names specificvolume, wetbulbtemperature, relativehumidity, and saturationenthalpy

  

Display numerical values next to the curves given in the list. By default, numerical values are given for all curves.

Description

• 

The PsychrometricChart function generates a plot with constant relative humidity curves in humid air, with the dry bulb temperature on the horizontal axis and the humidity ratio on the vertical axis. Three additional sets of lines can be drawn on this plot: for constant specific volume per dry air, constant wet bulb temperature, and constant saturation enthalpy.

• 

Such charts are often used for visualizations and computations involving thermodynamical properties relevant to human comfort, such as in air conditioning systems.

Examples

withThermophysicalData:

This is the default psychrometric chart.

PsychrometricChart

To design an air conditioning unit in Denver, Colorado (also known as the Mile High City), it is better to use a chart with an appropriately lower pressure value.

PsychrometricChart'pressure'=84kPa

Lhasa, in Tibet in China, is even higher. The relevant temperature range is also lower, and it is more arid.

PsychrometricChart'pressure'=67kPa,'temperature'=15degC..35degC,'maxhumidityratio'=0.025

Compatibility

• 

The ThermophysicalData[PsychrometricChart] command was introduced in Maple 2016.

• 

For more information on Maple 2016 changes, see Updates in Maple 2016.