The New CIBSE Future Weather Data Sets

We received an email a couple of weeks ago regarding the release of new CIBSE future weather data sets and we wanted to provide an update to all our sites visitors who might not know much about weather data and how it can be used to provide an accurate assessment of the performance of their buildings.

What are weather data sets?

Since 2002 CIBSE (Chartered Institute of Building Services Engineers) have been supplying consultants in the industry like us with weather data to be used in analysing a buildings performance.

There are 14 set locations across the UK and you would usually use the weather data set closest to your buildings actual location. For example a building located in Ipswich would use the Norwich weather data set.

  • The New CIBSE Future Weather Data SetsBelfast
  • Birmingham
  • Cardiff
  • Edinburgh
  • Glasgow
  • Leeds
  • London (3 sites)
  • Manchester
  • Newcastle
  • Norwich
  • Nottingham
  • Plymouth
  • Southampton
  • Swindon

As well as providing accurate weather data sets for todays climate they also provide estimated weather data for future climates. The future weather sets are provided for three different time periods the 2020s, 2050s and the 2080s and also account for different carbon emissions scenarios Low, Medium and High.

How are the weather data sets used?

The future weather data sets can be used in Dynamic Simulation Modelling software, such as EDSL TAS, to conduct future weather simulations. Just because a building passes the current building regulations and will not suffer from overheating when it is built, doesn’t mean it will continue to do so in 10, 30 or even 60 years time.

This is where using the future weather data sets to investigate the performance of your building over an extended time can help you to avoid costly future upgrades or modifications to your HVAC systems.

Put simply, by knowing the future performance of your building you can prepare for it today.

Why are there two types of weather data?

The weather data comes in two different types called TRY (Test Reference Year) and DSY (Design Summer Year) both are extremely important for analysing the performance of your building.

The TRY is made up of the 12 most average months from a 30 year collection of data, from 1984 to 2013. This means the TRY provides a typical year of weather data and therefore can be used for energy usage simulations, carbon emissions simulations and to ensure buildings pass Part L of the Building Regulations.

The DSY consists of a single continuous year, unlike the TRY which is made up from average months from all the years, and is used to represent a typically warm year of weather. Under the new weather data sets there are now three separate DSY weather years that can be used.

  • DSY 1 represents a moderately warm summer
  • DSY 2 represents a short but intense warm spell
  • DSY 3 represents a long but less intense warm spell

The DSY weather data sets are used for overheating analysis of buildings.

How Ecodraw can help?

At Ecodraw we have been carrying out future weather simulations for our clients and their buildings for a number of years already. Now using the new future weather data sets from CIBSE we will be able to provide these assessments even more accurately, allowing you to know the performance of your building over its lifetime.

If you would like to assess the future performance of your buildings or perhaps have a need for future weather simulations to satisfy planning requirements, please contact us today. We would love to help.

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