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Energy savings according to individual calculation

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The individual calculation of energy demand and savings is intended to permit a realistic estimation of cost effectiveness of a modernisation project. For this purpose input data are determined individually and according to the location, and can further be validated by a comparison of demand and consumption.

Examples of individual input data are:

  • Regional climate data (temperatures over the course of the year, duration of heat-ing period)
  • User behaviour (average indoor air temperature, hot water consumption, ventilation habits)
  • Use intensity (usage times, heated rooms, etc.)

Typical values can be used in the case of not precisely known input values. The specialized engineer or architect selects these values based on experience so that the demand is as close as possible to the really occurring consumption. The use intensity has a strong influence on the result. This includes, e.g., the number of residents, indoor air temperatures or presence and absence times. If the energy demand is calculated using "DIN V 18599", supplement 1 of this standard providers information.

In order to properly estimate the energy demand after modernization, it is possible that changes in user behaviour need to be accounted for. The energy savings may be lower if indoor air temperatures after modernization are higher than before. The reason for this is often a switch from partial heating to full comfort. This is also known as "rebound effect". Despite this uncertainty, the results of the individually adjusted calculations before and after modernisation offer the most exact foundation for the actually attainable energy savings. The individual energy accounting can be carried out by energy assessors, architects, or specialised planners with the respective qualifications.

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