There is great confidence that the building's energy system will remain efficient by catching deviations in energy consumption through control and regulation systems. However, it is not common for buildings to have such sophisticated systems that they can handle that task.

Energy technical systems need to be controlled, these systems consist of many technical components that wear out and break down over time.

Experience also shows that there may be deficiencies in the technical systems that were not noticed during the installation phase. These functional faults are missed due to inadequate inspection or that the inspection did not apply operational testing.

Control and regulation systems have many different setting options, these settings need to be reviewed regularly and adapted to the prevailing operations and season.

• The most commonly occurring ventilation systems such as FTX-FT-F-FX and S systems.
• Liquid-borne heat systems such as secondary heat, primary heat district heating, heat pump.
• Direct-acting electric heating systems.
• Cooling system & cooling machine.

• Temperature deviations in heating and ventilation systems
• Density check of heating valves and cooling valves
• Performance measurement recycling system ventilation
• Operating hours ventilation unit & adaptation to needs
• Sequence control recovery – heat – cooling
• Supply air temperature setpoint
• Pump shut-off function & setting value
• Heat curve setting
• Temperature in premises
• Local room controls
• Heat pump efficiency factor (SPF - SCOP)
• District heating system's cooling function (QW value)
• Cooling factor refrigerating machine (SPF – SCOP)

Accepted calculation methods with actual measured values are used in QWTOOL to obtain quantified calculation results. Where actual data included in calculations is missing, the user can in some cases choose a standard value suggested by QWTOOL.

The user specifies the energy statistics for the building.
Where energy statistics information is missing, the user can choose default values.
Default values for energy consumption will be based on information about the building's geographical location, building area, year of construction, activities in the building, and type of heating system. Default values for energy consumption are retrieved from the Energy Agency.

In calculations where standard values are used, the risk increases that the quantified calculation result deviates from the actual outcome.
By quantified calculation results is meant in this context to describe with numbers a reasonable size of how large a functional fault is - or how large the impact of an operational optimization is, the unit of size is expressed either in kilowatt hours (kWh) or in amounts (SEK).

The property's technical systems differ in their operating conditions depending on whether there is a winter or summer climate outside.
To ensure that the technical systems work energy-efficiently throughout the year, energy audits need to be performed during both the winter and summer seasons.
Features in QWTOOL are adapted based on whether you choose winter or summer routing.

Winter patrolling can be performed when the building's heating system is activated.
This typically occurs at ≤15°C.
If the building's ventilation system is an FTX system with heat recovery, the heat recovery must also be 100% loaded during the night setback, at this operating point the post-heating battery begins to be activated. This most commonly occurs when the outdoor temperature is between +12 and -5°C or lower.

Summer rounds can be performed when the building's heating system is usually not active. If the building has any form of comfort cooling system, that system is activated. This most commonly occurs at ≥18°C.

*The FTX system is a ventilation system with mechanical supply and exhaust air where heat from the exhaust air is recovered to the supply air side.

Direct energy savings in the range of 5 – 20 % for electricity and heat are commonly realized in a
Property holdings where discovered functional defects are rectified and proposed operational optimizations are performed. The level of energy savings is an empirical value from 10 years of work
with the work method in commercial and public premises.

With QWTOOL, it is possible to reduce a building's energy consumption down to the level that corresponds to the building's projected energy performance and maintain the energy consumption at this optimal level.

If a building already has optimized energy usage, QWTOOL will not further reduce the building's energy performance, in those cases the energy saving will be 0%. On the other hand, it can ensure that the optimal energy usage is maintained.

Buildings with more severe deficiencies in the technical systems may have energy-saving potential exceeding 20%.

Reading of temperatures can be done with the facility's electronic or analog sensors if these are positioned according to the schematic description specified in QWTOOL.

Where fixed sensors are lacking or where fixed sensors have questionable measurement values, the measurement value is checked with a handheld instrument. Outdoor sensors should always be checked against handheld instruments.

Reading with handheld instruments can be done with contact sensors, IR thermometers or IR thermal cameras. For measuring air temperature in premises, outdoors, in ventilation ducts and in ventilation units, it is recommended to use handheld instruments with wire sensors.
There are handheld instruments that can combine the different available measurement methods. An IR thermometer with a wire probe is a good combination for work with energy audits.

For measurement with IR thermometer on shiny surfaces, it is recommended to use emission tape or matte masking tape at the measurement point since shiny surfaces provide incorrect measurement values.

Yes, it is possible to perform the energy audit. You can enter data into the energy audit and QWTOOL will return functional messages & calculation results.

Yes, click on Support and fill in your wishes for a personal demonstration.