What is a k-value in a temperature chart?
In these charts, K-values for individual components are plotted as a function of temperature on the x-axis with pressure as a parameter. In each chart the pressure range is from 70 to kPa (10 to psia) and the temperature range is from 5 to 260 ºC (40 to 500 ºF).
What are k-values in chemistry?
In general K-values are function of the pressure, temperature, and composition of the vapor and liquid phases. The components making up the system plus temperature, pressure, composition, and degree of polarity affect the accuracy and applicability, and hence the selection, of an approach.
How are k-values determined?
Depending on the system under study, any one of several approaches may be used to determine K-values. Obviously, experimental measurement is the most desirable; however, it is expensive and time consuming. Alternatively, there are several graphical or numerical tools that are used for determination of K-values.
How do you calculate k-values by Equation 14?
In order to calculate K-values by equation 14, the mole fractions in both phases in addition to the pressure and temperature must be known. Normally not all of these variables are known. As is the case for the EoS approach, calculations are trial and error.
Is the cost per kWh a good metric?
While the cost per kWh can be more economical for larger installations, benefitting from economies of scale, it may not be the best metric for all scenarios. Anticipated advancements in technology and scaling up of productions will likely drive down these costs in the future.
Does a high pressure hydrocarbon system have a convergent k-value?
Early high pressure experimental work revealed that, if a hydrocarbon system of fixed overall composition were held at constant temperature and the pressure varied, the K-values of all components converged toward a common value of unity (1.0) at some high pressure.
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