6.3. Using the units aliases<br>

## 6.3. Using the units aliases

Units aliases are used for enforcing of units to variables. In this way it will be possible to perform mathematical operations on variables with different units, entered in data edition field.

Using of aliases is particularly advantageous during advanced parameterization of project. It enables for example the evaluation of thermomodernization operations depending on increasing thickness of insulation layer. For that purpose the User can enter in „Expressions variables” a constant value of insulation, which can be then called in edition field of insulation thickness. If the unit alias has been declared, the User can add to declared insulation thickness a specific thickness value and in this way he can evaluate the influence of increasing of insulation thickness on thermomodernization effect of a building. Such operation can be performed many times with low time expenditure for miscellaneous thickness values of partition insulation.

To enter the units aliases, select in program main menu the command >>Tools / Options / Editing of units aliases<<. Then in „General data” in position the position „Names of expressions units” becomes available. Here in columns they are presented in succession: groups of physical units, physical units, units symbols. In empty column “Name” next to selected unit of physical data a defined alias of this unit is to be entered, for example for unit of length - meter [m] an alias “m” can be assigned. To more complicated units, for example for [J/kgK] can be assigned for example alias „Jkg”

In data edition fields, to variable defined in „Expressions variables” can be added a number with an alias of unit compatible with unit of edited data, for example . Such record of an expression means, that the value of data (determined by this mathematical operation) is increased by 3.

To make the work with units aliases more easy, there is a possibility of calling of an default alias by entering a square bracket „[ ]” next to the number. It means, that at the numerical value there is an unit complying with the unit of edited field.