Thermal Liquid Predefined Properties (TL)

The tolerance ranges are defined in the block as matrices of zeros and ones. Each row corresponds to a tabulated temperature, and each column corresponds to a tabulated pressure. A zero indicates an invalid point, and a one indicates an acceptable one. These tolerance value matrices are internal to the block and cannot be changed.

In most cases, the tolerance value matrices are extracted directly from the tabular data. The pressure limits of glycol and glycerol mixtures are not available and are obtained explicitly from the block parameters. The figure below shows an example of the tolerance range for water. The shaded squares indicate areas of temperature and pressure outside the tolerance range.

Water

The properties of water are acceptable in the range between the triple point, when the temperature and pressure of the liquid reach 273.160 To and 611.657 Pa, and the critical point when the temperature and pressure of the liquid reach 647.096 To and 22.064 MPa. Pressures below the saturation point for a given temperature row in the confidence matrix have the value 0.

Seawater (MIT model)

The properties of seawater are acceptable at temperatures from 0°C to 120°C (from 273.15 K before 393.15 K) and at pressures above the saturation point to the maximum value 12 MPa. Pressures below the saturation point for given temperature values (and at a given concentration level) in the confidence matrix have the value 0. The concentration of the mixture may vary from 0 before 0.12 by weight.

Ethylene glycol and water mixture

The properties of the mixture of ethylene glycol and water are acceptable in the temperature range determined by the concentration of the mixture and at pressures within the minimum and maximum values specified in the block parameters (expanded horizontally to cover the width of the temperature lines).

The lower temperature limit is always the smallest of two values: the minimum temperature obtained from the available data and the freezing point of the mixture (the mixture must be in a liquid state). The upper limit of the temperature is always the maximum temperature obtained based on the available data. The concentration of the mixture may vary from 0 before 0.6, if a mass fraction is used, or from 0 before 1, if a volume fraction is used.

Propylene glycol and water mixture

The properties of a mixture of propylene glycol and water are acceptable in the temperature and pressure ranges described for a mixture of ethylene glycol and water. The concentration of the mixture may vary from 0 before 0.6, if a mass fraction is used, or from 0.1 before 0.6, if a volume fraction is used.

Glycerol and water mixture

The properties of a mixture of glycerol and water are acceptable in the temperature and pressure ranges described for a mixture of ethylene glycol and water. The concentration of the mixture may vary from 0 before 0.6 in terms of mass fraction. All properties are expanded to 100°C as follows:

Aviation fuel Jet-A

Jet-A fuel properties are acceptable at temperatures from −50,93°C to 372.46°C (from 222.22 K before 645.61 K) and at pressures above the saturation point and up to the maximum value 2.41 MPa. Pressures below the saturation point for a given temperature row in the confidence matrix have the value 0.

Diesel fuel

The properties of diesel fuel are acceptable at temperatures from −34.95°C to 417.82°C (from 238.20 K before 690.97 K) and at pressures above the saturation point and up to the maximum value 2.29 MPa. Pressures below the saturation point for a given temperature row in the confidence matrix have the value 0.

SAE 5W-30

The properties of SAE 5W-30 fuel are derived from data covering temperature and pressure ranges for each parameter. The unit uses the measured parameter values in the temperature range from 29.85°C to 74.85°C (from 303 K before 348 K) and pressures from 7 MPa up to 82 MPa. The block extrapolates data beyond this range to −38°C and 200°C (from 235.15 K before 473.15 K) and before 0.01 MPa and 100 MPa. The way the data is smoothed and extrapolated depends on the type of data:

The density and coefficients of thermal expansion of aqueous mixtures of glycol and glycerin are determined from the block parameters. The density of a liquid, depending on pressure and temperature, is calculated as follows:

where

The change in liquid density is estimated as follows:

The coefficient of thermal expansion is calculated as follows: