New facades enhance energy efficiency of buildings

November 13, 2017, Universidad Politécnica de Madrid
New facades enhance energy efficiency of buildings
Diagram of the facade functioning in summer (left) and winter (right). Credit: Jaime Santa Cruz and César Porras

Recently, two researchers from UPM have developed a ventilated façade with a double chamber and flow control device that significantly saves energy in buildings. This sustainable, efficient solution can be applied in both renovations and new buildings due to its simplicity.

The is the main constructive element of a building to meet the requirements of and interior comfort. The type of system, the design and the right execution of the façade itself are critical aspects that determine the final consumption of the building.

Today, the air flow expenses comprise 40 to 65 percent of the total expenses of a building. Buildings in a Mediterranean-continental climate such as Spain experience winter energy losses through north and east facades due to low temperatures. Likewise, these buildings in summer gain energy through their south and west facades due to solar radiation. In both cases, airflow is needed in the building in order to maintain suitable inner conditions for inhabitants, counteracting the energy gains-losses trough the building envelope.

In order to improve the energy efficiency of facades, two researchers from the group of Tecnología Edificatoria y Medio Ambiente (TEMA) at UPM have developed a new system of ventilated façade. Today, the conventional ventilated facades are composed of an inner sheet, thermal insulation, ventilation and exterior finish.

The new facade adds a second air chamber between the existing one and the facade insulation. Both chambers are interconnected by the bottom of the façade. Another feature is a new element at the top to regulate the airflow in the chambers, depending on the gradient of the existing temperature between inside and outside the building.

This presents two improvements over conventional systems. Energy gains-losses are reduced through the facades reducing, and consequently, the energy consumption due to air flow. Secondly, the design of the system helps to reduce the vertical temperature gradient along the envelope, homogenizing the air temperature in the chambers throughout the year.

By minimizing the vertical thermal gradients, global consumption due to energy gains-losses through the façade depends less on the height of the , preventing the upper houses to present higher or lower indoor comfort and degree of energy efficiency than the lower houses. Additionally, this system is a sustainable and that can be applied in both rehabilitation works and new buildings due to its simplicity of implementation.

The initial cost can be short-term amortized by accounting for the remarkable energy savings of this design. The authors of this work say, "This research work highlights the potential energy efficiency of buildings through the redesign of conventional construction systems."

Explore further: A self-sufficient home with solar panels installed only on its facade

More information: Jaime Santa Cruz Astorqui et al. Ventilated Façade with double chamber and flow control device, Energy and Buildings (2017). DOI: 10.1016/j.enbuild.2017.04.063

Related Stories

Fitting hot and cold climates into the 'envelope'

February 7, 2017

The "energy eater" European building stock is aiming for a greener future. Researchers are testing an "envelope" system combining active and passive technologies, fitted over the existing façade, to make buildings more efficient. ...

Building a sustainable future: Urgent action needed

October 30, 2017

We need to act urgently to increase the energy efficiency of our buildings as the world's emerging middle classes put increasing demands on our planet's energy resources. These are the findings of a new report, published ...

From passive to active: Face lifting facades

July 30, 2015

The biggest current innovation in façade design stems from a modular façade with smart materials that act as an active skin to make old buildings energy efficient.

Recommended for you

Researchers 3-D print electronics and cells directly on skin

April 25, 2018

In a groundbreaking new study, researchers at the University of Minnesota used a customized, low-cost 3D printer to print electronics on a real hand for the first time. The technology could be used by soldiers on the battlefield ...

Balancing nuclear and renewable energy

April 25, 2018

Nuclear power plants typically run either at full capacity or not at all. Yet the plants have the technical ability to adjust to the changing demand for power and thus better accommodate sources of renewable energy such as ...

Electrode shape improves neurostimulation for small targets

April 24, 2018

A cross-like shape helps the electrodes of implantable neurostimulation devices to deliver more charge to specific areas of the nervous system, possibly prolonging device life span, says research published in March in Scientific ...

China auto show highlights industry's electric ambitions

April 22, 2018

The biggest global auto show of the year showcases China's ambitions to become a leader in electric cars and the industry's multibillion-dollar scramble to roll out models that appeal to price-conscious but demanding Chinese ...

After Facebook scrutiny, is Google next?

April 21, 2018

Facebook has taken the lion's share of scrutiny from Congress and the media about data-handling practices that allow savvy marketers and political agents to target specific audiences, but it's far from alone. YouTube, Google ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.