Estimate the energy supply

Our planning tool simulates and compares different energy solutions based on the previously known data of the newly planned building. It supports the selection of the most efficient and economical solution.

Climate Protection and Economic Efficiency in the Energy Supply of Buildings

An energy supply for buildings that protects resources makes a significant contribution to climate protection in Germany. Strict legal requirements (EnEV, EEWärmeG) and subsidies (EEG, KWKG) are intended to achieve the lowest possible consumption of primary energy or fossil fuels for the heating and cooling of new buildings.

An expected increase in energy prices in the future also offers motivation to consider alternative energy supply concepts – such as cogeneration units, geothermal energy, ad- or absorption cooling, solar thermal energy or photovoltaics. But the inclusion of these energy producers usually means a significantly higher initial investment, while the economic, long-term benefit through lower operating costs is difficult to estimate.

Planning Tool Compares Combinations of Energy Producers

Together with the Goldbeck company, we have developed a planning tool for this problem.

Depending on different key data such as:

  • the cubature (volume of a building, regardless of its design or material)
  • type of use
  • location-specific climatic conditions

it compares meaningful combinations of energy producers with regard to different key figures. These are especially investment and operating costs, but also the expected CO2 emissions or the comfort of the cooling system.

 

Software Already Helps in Early Phase of Decisions

The resulting software offers the builder comprehensive multi-criteria decision support. The user can consider different variants in relation to the aforementioned factors against each other and receives in particular estimates for the amortization times of solutions with high investment but lower energy consumption in operation. In other words, the processes in which initial expenses for a property are covered by the resulting income.

A simulation forms the basis for determining the key figures. This simulates the coverage of location- and building-specific heating and cooling needs as well as electricity generation and consumption for the different producer combinations over a period of one year. How detailed the simulation is depends mainly on the amount of available information at the early planning phase in which the decision on the energy concept is made. This is where the planning tool differs from the building simulation tools that are already available on the market, which usually require data about the building that is only available in a very advanced planning phase.

Software concept
© Fraunhofer ITWM

Software concept