pyXSteam的Python项目详细描述
X团队
Magnus Holmgren为Matlab和Excel发布的原件：
http://xsteam.sourceforge.net和/或http://www.x-eng.com
xsteam（主要）从0-
1000巴，0-2000°C，根据IAPWS release IF-97。为了
不同区域的函数精度参见if-97第4页
还包括热导率和粘度，它们不是
IF97的发布。
要求
使用Python3.6及更高版本安装Pyxsteam没有任何要求。
测试需要numpy，演示需要numpy和matplotlib
安装
运行python3 setup.py install
要运行unittests：python setup.py test但确保安装了numpy
要测试安装是否成功，请运行python3 bin/pyXSteamDemo.py。这需要安装numpy和matplotlib。
声音函数的速度仍有一些错误（从v0.4.2开始），因此请注意，它们超出了错误范围。除了精度错误，不应该有警告。
命名
所有函数都遵循相同的命名模式：首先是所需的属性，
然后是下划线_，然后是所需的输入属性示例：
t_ph是温度与压力和焓的函数。一份清单
有效功能如下：
| Property | Description |
|---|
| t | Temperature (°C or °F) |
| p | Pressure (bar or psi) |
| h | Enthalpy (kJ/kg or btu/lb) |
| v | Specific volume (m3/kg or ft^3/lb) |
| rho | Density (kg/m3 or lb/ft^3) |
| s | Specific entropy (kJ/(kg °C) or btu/(lb °F)) |
| u | Specific internal energy (kJ/kg or btu/lb) |
| Cp | Specific isobaric heat capacity (kJ/(kg °C) or btu/(lb °F)) |
| Cv | Specific isochoric heat capacity (kJ/(kg °C) or btu/(lb °F)) |
| w | Speed of sound (m/s or ft/s) |
| my | Viscosity (N s/m^2 or lbm/ft/hr) |
| tc | Thermal Conductivity (W/(m °C) or btu/(h ft °F)) |
| st | Surface Tension (N/m or lb/ft) |
| x | Vapor fraction |
| vx | Vapor Volume Fraction |
用法
简单示例：
from pyXSteam.XSteam import XSteam
steamTable = XSteam(XSteam.UNIT_SYSTEM_MKS) print steamTable.hL_p(220.0)
通过使用unit system参数，您可以告诉xsteam您正在使用的witch unit system。
steamTable = XSteam(XSteam.UNIT_SYSTEM_MKS) # m/kg/sec/°C/bar/W
steamTable = XSteam(XSteam.UNIT_SYSTEM_FLS) # ft/lb/sec/°F/psi/btu
steamTable = XSteam(XSteam.UNIT_SYSTEM_BARE) # m/kg/sec/K/MPa/W
要启用日志记录，请在代码中添加以下行：
import logging logger = logging.getLogger(\'pyXSteam\')
logger.setLevel(logging.DEBUG) sh = logging.StreamHandler()
sh.setFormatter(logging.Formatter(\'%(name)s - %(levelname)s - %(message)s\'))
logger.addHandler(sh)
可用功能
温度
| Function | Description |
|---|
| tsat_p | Saturation temperature |
| t_ph | Temperature as a function of pressure and enthalpy |
| t_ps | Temperature as a function of pressure and entropy |
| t_hs | Temperature as a function of enthalpy and entropy |
压力
| Function | Description |
|---|
| psat_t | Saturation pressure |
| p_hs | Pressure as a function of h and s. |
| p_hrho | Pressure as a function of h and rho. Very inaccurate for solid water region since it's almost incompressible! |
焓
| Function | Description |
|---|
| hV_p | Saturated vapor enthalpy |
| hL_p | Saturated liquid enthalpy |
| hV_t | Saturated vapor enthalpy |
| hL_t | Saturated liquid enthalpy |
| h_pt | Enthalpy as a function of pressure and temperature |
| h_ps | Enthalpy as a function of pressure and entropy |
| h_px | Enthalpy as a function of pressure and vapor fraction |
| h_prho | Enthalpy as a function of pressure and density. Observe for low temperatures (liquid) this equation has 2 solutions |
| h_tx | Enthalpy as a function of temperature and vapor fraction |
比体积
| Function | Description |
|---|
| vV_p | Saturated vapor volume |
| vL_p | Saturated liquid volume |
| vV_t | Saturated vapor volume |
| vL_t | Saturated liquid volume |
| v_pt | Specific volume as a function of pressure and temperature |
| v_ph | Specific volume as a function of pressure and enthalpy |
| v_ps | Specific volume as a function of pressure and entropy |
密度
| Function | Description |
|---|
| rhoV_p | Saturated vapor density |
| rhoL_p | Saturated liquid density |
| rhoV_t | Saturated vapor density |
| rhoL_t | Saturated liquid density |
| rho_pt | Density as a function of pressure and temperature |
| rho_ph | Density as a function of pressure and enthalpy |
| rho_ps | Density as a function of pressure and entropy |
比熵
| Function | Description |
|---|
| sV_p | Saturated vapor entropy |
| sL_p | Saturated liquid entropy |
| sV_t | Saturated vapor entropy |
| sL_t | Saturated liquid entropy |
| s_pt | Specific entropy as a function of pressure and temperature (Returns saturated vapor enthalpy if mixture) |
| s_ph | Specific entropy as a function of pressure and enthalpy |
比内能
| Function | Description |
|---|
| uV_p | Saturated vapor internal energy |
| uL_p | Saturated liquid internal energy |
| uV_t | Saturated vapor internal energy |
| uL_t | Saturated liquid internal energy |
| u_pt | Specific internal energy as a function of pressure and temperature |
| u_ph | Specific internal energy as a function of pressure and enthalpy |
| u_ps | Specific internal energy as a function of pressure and entropy |
比等压热容
| Function | Description |
|---|
| CpV_p | Saturated vapor heat capacity |
| CpL_p | Saturated liquid heat capacity |
| CpV_t | Saturated vapor heat capacity |
| CpL_t | Saturated liquid heat capacity |
| Cp_pt | Specific isobaric heat capacity as a function of pressure and temperature |
| Cp_ph | Specific isobaric heat capacity as a function of pressure and enthalpy |
| Cp_ps | Specific isobaric heat capacity as a function of pressure and entropy |
比等容热容
| Function | Description |
|---|
| CvV_p | Saturated vapor isochoric heat capacity |
| CvL_p | Saturated liquid isochoric heat capacity |
| CvV_t | Saturated vapor isochoric heat capacity |
| CvL_t | Saturated liquid isochoric heat capacity |
| Cv_pt | Specific isochoric heat capacity as a function of pressure and temperature |
| Cv_ph | Specific isochoric heat capacity as a function of pressure and enthalpy |
| Cv_ps | Specific isochoric heat capacity as a function of pressure and entropy |
音速
| Function | Description |
|---|
| wV_p | Saturated vapor speed of sound |
| wL_p | Saturated liquid speed of sound |
| wV_t | Saturated vapor speed of sound |
| wL_t | Saturated liquid speed of sound |
| w_pt | Speed of sound as a function of pressure and temperature |
| w_ph | Speed of sound as a function of pressure and enthalpy |
| w_ps | Speed of sound as a function of pressure and entropy |
粘度
| Function | Description |
|---|
| my_pt | Viscosity as a function of pressure and temperature |
| my_ph | Viscosity as a function of pressure and enthalpy |
| my_ps | Viscosity as a function of pressure and entropy |
热导率
| Function | Description |
|---|
| tcL_p | Saturated vapor thermal conductivity |
| tcV_p | Saturated liquid thermal conductivity |
| tcL_t | Saturated vapor thermal conductivity |
| tcV_t | Saturated liquid thermal conductivity |
| tc_pt | Thermal conductivity as a function of pressure and temperature |
| tc_ph | Thermal conductivity as a function of pressure and enthalpy |
| tc_hs | Thermal conductivity as a function of enthalpy and entropy |
表面张力
| Function | Description |
|---|
| st_t | Surface tension for two phase water/steam as a function of T |
| st_p | Surface tension for two phase water/steam as a function of p |
蒸汽分数
| Function | Description |
|---|
| x_ph | vapor fraction as a function of pressure and enthalpy |
| x_ps | vapor fraction as a function of pressure and entropy |
蒸汽体积分数
| Function | Description |
|---|
| vx_ph | vapor volume fraction as a function of pressure and enthalpy |
| vx_ps | vapor volume fraction as a function of pressure and entropy |
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