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Degree Days for free

Enhance your energy management.

We validate data from over 80 temperature zones across the UK to give you the best possible degree day data for your town or city.

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Stark ID

Stark ID our energy analytics platform, automatically selects the weather station nearest your site’s postcode to save you the task of setting your location across your portfolio.

We bring together and validate half hourly temperature data from over 90 sensors across the UK ensuring that you are provided with the most accurate information specific to your location.

This temperature data is the foundation of our degree day reporting toolkit designed to help you analyse, monitor and target the efficiency of your sites.

You can set your base temperature – and if you are not sure what temperature to select then Stark ID can calculate appropriate base temperatures for your sites based on your energy consumption data.


What is a Degree Day?

Degree days measure of the duration and magnitude of the difference between the external temperature and the base temperature.

The base temperature is the external temperature at which additional heating or cooling is required to maintain a comfortable environment in your building.

The greater the difference between internal and external temperature, the quicker heat will be lost from your building. The longer the colder period lasts, the more heat will be lost.

The colder your building gets, the more energy is required to keep it warm. A heating degree day is a measure of both the difference and duration of the cold outside.

For cooling, the opposite is the case.

Base Temperatures

As degree days are calculated using the difference between a base temperature and the outside temperature, an incorrect base temperature for your building could present a misleading picture.

Many factors affect the base temperature of your building and different buildings will have different heating and cooling base temperatures.

Your base temperature will be affected by the temperature required inside, heat gains from equipment or the sun and the heat loss properties of the building itself.

Whilst there are default base temperatures for heating and cooling, these are calculated using non-specific situations assuming internal temperatures, average heat gains and standard building fabric.

Of course, the other component in your degree day calculation is the external temperature; making it just as important to have accurate and local external temperature figures.

Your energy consumption can be directly affected by various factors.

Your energy consumption can be directly affected by factors such as whether your building is occupied, the occupant’s behaviour, the temperature outside or production levels. Unless these factors are considered, your evaluation of energy performance could be misleading.

So why can’t we use temperature?

To illustrate why temperature figures can sometimes be unhelpful, let’s ask the simple question; what was the temperature yesterday?

We could use the average temperature yesterday or perhaps the temperature at a certain time of the day.

However, this figure won’t portray any variations in the temperature throughout the day.

An average temperature could be the same for two days with very different heating or cooling requirements.

Day one has a cold morning (requiring heating) with a warm afternoon (requiring cooling) but these are averaged out showing the same average temperature as day two which is a consistently mild day needing no heating or cooling-related consumption.

This is why an understanding of degree days is vital when analysing the effect of external air temperature on your building’s energy consumption.


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