Energy Investigations
An energy investigation is a comprehensive study that shows where and how a building loses heat energy and what measures are required to minimize heat losses. Thermal energy cannot be “consumed” inside a building. The energy is lost through the building’s envelope and sewage. Each existing building is unique and has its own loss profile. Heat flow measurement, electricity measurement and thermal photography are methods that show how and where energy losses occur. Thermal photography can show systematic leaks and accidental point-by-point leaks, such as uninsulated heating pipes in parts of the building.
Electricity use is mapped in detail by installing temporary electricity meters in different places in the building. The electricity supplier’s summaries of seasonal and daily variations are analysed as a complement to the measurements. The information leads to which equipment should be replaced with new equipment with lower power. Often, the use can be affected by individual billing and information to the residents about how the electricity supply occurs.
After the energy losses have been mapped, an action plan is created that reduces the losses, shows appropriate energy recovery measures and how own energy can be produced. The possibilities for storing heat and electrical energy are investigated. Through effective measures for reduced energy losses and far-reaching energy recovery, the building needs to be supplied with significantly less energy than in the initial position. For the thermal energy, the end result can be that only 25 – 35 percent of the original heat energy is needed. Usually this heat can be produced with heat pumps using 10 – 15 percent electricity which is produced on or near the own building.
The energy investigation creates the basis for designing the investment plan with measures for different stages of the energy efficiency process. Profitability is calculated according to standard accounting rules. By following the logic of the pyramid, the greatest possible reduction in energy purchases is achieved for a given investment amount.
Once the energy study and investment plan have been completed, the measures can be designed and later procured.