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Selected tag(s): Normal climateDefinition
- What does energy consumption at normal climate means?
A consumption at normal climate is the consumption which would have occurred, with a normal climate over the heating and cooling periods. The normal climate is defined as the average climate observed over a certain period over the past (20 years or more).
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- What is an energy consumption with climate corrections?
An energy consumption with climate corrections is a consumption at normal climate.
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- What is a number of cooling degree day?
The number of cooling degree days (CDD) is the sum over each day of the cooling period of the difference between the average outside temperature and a reference indoor temperature. The higher this number the warmer is the cooling period. The CDD value depends on the level of the reference indoor temperature (between 20°C and 23°C depending on the sources).
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- What is a number of heating degree days?
The number of heating degree days (HDD) is an indicator of winter severity, and thus of heating requirement. It is calculated as the sum over each day of the heating period (e.g. October to April) of the difference between a reference indoor temperature and the average outside temperature. The higher this number the colder is the heating period. The HDD value depends on the level of the reference indoor temperature (typically 18°C). The national value should be a population weighted average of meteorological stations, so as to be representative of national heating or cooling consumption rather than an arithmetic average.
Example: if the average temperature of a day is 5°C, HDD = 13 = 18 - 5.
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- What is a normal number of degree days?
The normal number of degree days corresponds to a long-term average of the number of heating degree days (or cooling degree days) over a given period in the past (e.g. 25 years for Eurostat, 20 years for some countries). The number of years taken into account depends on the source. It can be calculated over a fixed period (e.g. 1980-2004 for Eurostat) or a moving period. In ODYSSEE, it is based on the 2000-2020 average, in order to have a more recent reference period.
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- Why are energy efficiency indicators usually climate corrected?
Energy efficiency indicators are climate corrected so that their variation from one year to the other is independent of climatic influences (such as a colder winter implying a higher consumption of heating).
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Methodology
- How are climate corrections made?
Climatic corrections are done in a linear way on the space heating (H) or cooling (AC) consumption on the basis of the ratio between normal degree days and actual degree days:
H = Hn x (HDD/HDDn)
or H = Hn x (1-K)+ Hn x K x (HDD/HDDn) with K = share of heating consumption independent of climate fluctuations (e.g. 10%) and Hn the consumption at normal climate
AC = ACn x (CDD/CDDn)
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