Stock Analysis Calculations

See also: Analysis View, Demand Analysis, Stock Analysis

Use the Demand Branch Properties screen to set-up a Stock Analysis for a demand technology.   Technology branches at which stock analyses are being conducted are shown in the tree marked with the stock icon ().  For a given technology branch, the following equations describe the calculations for the stock analysis methodology:

Stock Turnover

Where:

 t is the type of technology (i.e. the technology branch)
v is the vintage (i.e. the year when the technology was added)
y is the calendar year
Sales: is the number of vehicles added in a particular year: entered as an expression.
Stock is the number of devices existing in a particular year: either entered as an expression for Current Accounts or calculated internally based on historical sales.
Survival is the fraction of devices surviving after a number of years: entered as a lifecycle profile.
V is the maximum number of vintage years: determined automatically from the survival lifecycle profile, with a maximum of 30 years.

Energy Intensity

Where:

 EnergyIntensity is energy use per device for new devices purchased in year y. Entered as an expression.
Degradation is a factor representing the change in energy intensity as a technology ages. It equals 1 when y=v. Entered as a lifecycle profile.

Energy Consumption

Energy-Based Emissions (e.g. CO2 and other Greenhouse Gases)

Emission results are calculated and then displayed in the Results View.