BRINEPROP

BRINEPROP is an external procedure that returns secondary refrigerant properties as a function of temperature in °C, and concentration of brine fluid in water, in mass-%. The Equations are valid down to Freezing point.

The general call looks like:

CALL BRINEPROP(Pr$,Fl$,Conc,Temp:output)

...where output is the output parameter set by the input parameter Property, Pr$, e.g. density or specific heat.

A BRINEPROP call can look as follows:

CALL BRINEPROP('Density','EA',50,-5:rho_brine)

Input Parameters:

Property

- Pr$ is an input variable that states what is to be calculated: 'Freeze', 'Density', 'SpecHeat', 'ThermalC' and 'DynVisc'.

•	'Freeze'       => output = Freezing Point in degrees Celsius

•	'Density'      => output = Density in kg/m^3

•	'SpecHeat'   => output = Specific Heat in kJ/kg,K

•	'ThermalC'    => output = Thermal Conductivity in W/m,K

•	'DynVisc'     => output = Dynamic Viscosity in mPa*s

Fluid

- Fl$ states what secondary refrigerant is to be evaluated: 'EG', 'PG' etc. Figures in brackets describes the interval, mass-%, for which the equations are valid.

Concentration

•	'EG' = Ethylene Glycol / Water	[0.0<Conc<56.1]

•	'PG' = Propylene Glycol / Water	[15.2<Conc<57.0]

•	'EA' = Ethyl Alcohol / Water 	[11.1<Conc<60.1]

•	'MA' = Methyl Alcohol / Water 	[7.8<Conc<44.3]

•	'GL' = Glycerol / Water 	[19.5<Conc<63.0]

•	'NH3' = Ammonia / Water 	[7.8<Conc<23.6]

•	'K2CO3' = Potassium Carbonate / Water	[13.3<Conc<39.0]

•	'CaCl2' = Calcium Chloride / Water 	[9.0<Conc<29.4]

•	'MgCl2' = Magnesium Chloride / Water 	[7.2<Conc<20.5]

•	'NaCl' = Sodium Chloride / Water 	[7.9<Conc<22.6]

•	'KAc' = Potassium Acetate / Water 	[11.0<Conc<41.0]

If a concentration value, Conc, is beyond upper or lower limits, an error message will be shown.

Hint: Set the upper and lower limits of the concentration, in the Variable Info window, to the limits above.

Concentration and Temperature

- Conc = Concentration in mass-%

- Temp = Temperature in degrees Celsius

On the Origin of Equations

Equations, properties and coefficients used in this procedure are based on equations, and data from the IIR/IIF handbook on secondary refrigerants: Thermophysical Properties of Liquid Secondary Refrigerants, Melinder  Å. editor, International Institute of Refrigeration, Paris, 1997.

©	Anders Johansson and Per Lundqvist 1997-1998

Division of Applied Thermodynamics and Refrigeration

Department of Energy Technology, Royal Institute of Technology

Stockholm, SWEDEN

®	EES, f-Chart Software, Middleton WI, USA

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