BTS Blog

Recent news and updates

BTS attend IEA Annex 71 Meeting

The International Energy Agency (IEA) are currently running a series of research projects which are known as ‘Annexes’, these Annexes bring together an international group of top researchers on a range of energy-related topics. IEA’s Annex 71 is something of great interest to BTS as it focuses on building energy performance assessment based on in-situ measurements.

Who are IEA?

The IEA is an international organisation which works to ensure reliable, affordable and clean energy for its 30 member countries and beyond. 

You can find out more about them at:

Dr Richard Jack of BTS has been participating in the Annex, providing insights from the development and testing of BTS’s Smart HTC product and learning from the work carried out by a group of experts drawn from industry, academia and research institutes.

The 6th meeting of the Annex took place in Bilbao, Spain in April, Richard attended along with Dr Richard Fitton of the University of Salford, who BTS are working in partnership with on the development of the Smart HTC product.

The meeting focused on data analysis methods to calculate the thermal performance of buildings, including how best to account for the presence of occupants. This is a tricky challenge as occupants actually provide an unmetered heat input to a building, this is known as ‘metabolic heat gain’ and is the heat generated by the body.

Surprisingly, in a well-insulated house, metabolic heat gains can actually provide a significant proportion of the total heat input to the house. The heat loss of a building is usually determined by measuring the heat input (mainly from the heating system and electricity use), so it’s important to account for all heat gains. Smart meters can tell us a lot about energy use, but they can’t tell us how many people are in the house or if they’re generating extra heat on an exercise bike!

Dr Richard Jack (far left) with fellow attendees at IEA Annex 71 meeting in Bilbao

The challenge now is how to include this heat gain in a robust but non-invasive way. BTS continues to develop and improve methods to  achieve this, and expects further experiments/testing to commence over the next couple of months. 

Smart HTC

Measure whole building fabric heat loss (also known as a Heat Transfer Coefficient or HTC) using our algorithm that interfaces with live smart meter data.

Categories: Uncategorised