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EAB Software

Energy Auditing of Buildings Software 

User-friendly tool for calculating the energy performance of buildings. The software is suitable for energy auditing of new and existing buildings and for building certification.

Main features:

  • According to the EU norms and standards - Directive 2010/31/EU, 2002/91/EC, ISO 13790:2008 and references
  • Monthly calculations, reflecting the influence between parameters
  • All basic parameters for energy calculations included: geometry, U-values, infiltration, indoor temperatures, occupancy schedules, heating schedules, ventilation rates, operation periods, lighting, various equipment, system efficiencies
  • Calculations for "Actual", "Baseline" and "After measures"
  • Results presented as energy need, energy use and heat transfer coefficients
  • Savings presented for each measure
  • E-t curve


Energy performance calculation

The EAB Software is calculating the total, annual energy use of the building, divided into seven budget items:


     - Heating

     - Ventilation (heating)

     - Domestic hot water

     - Cooling

     - Fans & pumps

     - Lighting

     - Various equipment


User friendly interface

For each of the energy budget items, the software screen includes the Parameters influencing the energy use in the first column, and Standard values in the second column based on national building codes, standards, norms and experiences. In the next column, the existing condition – Actual for the building to be calculated is described.



If for instance the indoor temperature during the heating seasons has been too low, the mechanical ventilation system has not been operating fully, or if we would like to improve the comfort when renovation the building (e.g. by increasing the ventilation rate), we might want to take that into consideration when continuing the energy and profitability calculations. This is to be entered in the Baseline column.



By describing alternative solutions or energy efficiency measures in the column Measure, the calculated results are listed in the column Savings (for each parameter/measure).



When performing calculations, each building can be modelled in detail, and alternative solutions and measures simulated.

The software allows, with quick changes in the input values and/or typical buildings included in the reference data, easy modelling and fast and flexible evaluations. 


Seven typical buildings are included (apartment, office, hospital, kindergarten, school, university, warehouse); sub-types and other building types can easily be added.


Monthly climatic data

The software calculates annual energy use using quasi steady state condition, and monthly values for outdoor temperature and solar radiation for a typical, meteorological year.


By defining start and stop of the heating season for a normal climatic year, the software is including the energy use for heating for the heating season only.


The winter design temperature (DOT) is used to calculate the maximum power demand (if data entered) for heating and ventilation.


Mutual influence between measures and systems

Savings from adding for instance 100 mm insulation to the external walls and changing from double- to triple-glazed windows will be different if implemented separately or in combination. Furthermore, the savings will be smaller if the average room temperature is being reduced, by for instance installing automatic controls for temperature night set back.



If more energy efficient lighting is installed, the delivered energy for lighting (electricity) will be reduced. However, reduced heat from lighting will normally increase the energy use for heating – that could be covered by the district heating system.



By improving the boiler efficiency, the savings of fuel, for instance by additional insulation of roof, will be reduced.


All these mutual influences and practical implications for a real project are taken care of in the EAB Software, where the savings for each measure are presented – based on the actual “package” of measures entered into the software. 

Energy Monitoring - ET Curve

To ensure energy efficient operation of buildings, continuous energy monitoring is necessary.



The basic tool for energy monitoring is the Energy-Temperature (ET) diagram. Every building has its own, unique ET curve; the target value for energy use at different outdoor temperatures.


If the weekly con­sump­tion is more than 5 – 10 % outside the target value, actions should be taken to identify the cause and make corrections.


The EAB Software includes calculation of the ET Curve (for Actual, Baseline and After measures).


Country specific Software

To prepare a tailored version of the ENSI Software for a new country, it is necessary to define and include:

  • Climatic data for selected places
  • Reference values (including national Building Codes)

The Software is prepared for easy translation into new languages.


More information about other useful functions of the EAB Software can be found in the software User Guide.


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