Method AirState

src/utilities/filetypes/EpwFile.cpp:172–193

}

AirState::AirState()
  :  // Set parameters
    m_drybulb(20.0),
    m_pressure(101325.0),
    m_psat(psat(m_drybulb)),
    m_phi(0.5) {
  // Compute moist air properties, eqns from ASHRAE Fundamentals 2009 Ch. 1, should probably just set all of these
  // Water vapor saturation pressure (uses eqns 5 and 6)
  double pw = m_phi * m_psat;               // Relative humidity, eqn 24
  m_W = 0.621945 * pw / (m_pressure - pw);  // Humidity ratio, eqn 22
  // TODO: Use the function above
  m_h = 1.006 * m_drybulb + m_W * (2501 + 1.86 * m_drybulb);                  // Moist air specific enthalpy, eqn 32
  m_v = 0.287042 * (m_drybulb + 273.15) * (1 + 1.607858 * m_W) / m_pressure;  // Specific volume, eqn 28
  // Compute the dew point temperature here
  boost::optional<double> dewpoint = solveForDewPoint(m_drybulb, pw, 1e-4, 100);
  OS_ASSERT(dewpoint);
  m_dewpoint = dewpoint.get();
  // Compute the wet bulb temperature here
  boost::optional<double> wetbulb = solveForWetBulb(m_drybulb, m_pressure, m_W, 1e-4, 100);
  OS_ASSERT(wetbulb);
  m_wetbulb = wetbulb.get();
}

boost::optional<AirState> AirState::fromDryBulbDewPointPressure(double drybulb, double dewpoint, double pressure) {
  AirState state;