Casto Cañavate explains how the focus is changing from simple energy efficiency to strategies for a sustainable world through digitalisation and energy management using KNX

There has definitely been a positive change in people’s approach to being more energy efficient and sustainable. Thirty years ago, these issues were nowhere on the agenda. A decade later, those in the commercial sector especially, began to realise how energy efficiency could reduce their bills. But it is only recently that using less energy and being greener has become an important issue for everyone, and even then, the two concepts are not always linked. How many times do we still see an empty office building all lit up after working hours, or an empty home using the heating system whilst the family is away?

Passive measures to save energy

Today, there are some obvious passive measures that can be taken to save energy in a home or building that can be implemented easily. Where possible, the bioclimatic aspects in the design phase of the construction should be considered, so that the building is orientated to benefit from the right amount of natural light, natural ventilation, etc. Using the right materials can offer not only sound insulation, but protection from extreme thermal fluctuations, reducing the need for additional heating or cooling. And even after the construction is complete, consumables such a lightbulbs can be replaced by energy-saving LEDs, and timers can be used to control heating systems.

Active measures to save energy

Active measures can also be taken to increase energy savings, drastically. For instance, whereas traditional thermostats automate heating and cooling activation based on room temperature, modern thermostats use smart technologies to add a whole new set of features to guarantee energy savings, such as integrated sensors that turn the system off and on based on movement in the home or office. Likewise, smart devices can be used to activate ventilation, lighting and other room functions as well as heating, according to the use of the room and external conditions.

The combination of such measures can increase the energy efficiency of buildings significantly, but there is still a need for a change to a more sustainable world, which cannot be achieved through energy-efficient projects alone. We need to move to the next level: energy management with KNX.

Global digitalisation

According to the IEA (International Energy Agency), buildings account for nearly one-third of global final energy consumption and 55% of global electricity demand. Electricity demand growth in buildings has been particularly rapid over the last 25 years, accounting for nearly 60% of total growth in global electricity consumption. In some rapidly-emerging economies, including China and India, electricity demand in buildings grew on average by more than 8% per year over the last decade.

The IEA’s Digitalisation and Energy technology report <IEA (2017), Digitalisation and Energy, IEA, Paris <https://www.iea.org/reports/digitalisation-and-energy> states that electricity use in buildings is set to nearly double from 11PWh (petawatt hours, where 1PWh = 1015 watts = 1,000,000,000,000,000 watts) in 2014 to around 20PWh in 2040, requiring large increases in power generation and network capacity. Digitalisation, including smart thermostats and smart lighting, could cut total energy use in residential and commercial buildings between 2017 and 2040 by as much as 10%. Cumulative energy savings over the period to 2040 would amount to 65PWh – equal to the total final energy consumed in non-OECD countries in 2015.