International. In IFEMA was presented the study called: "Adaptation of the user to the buildings of almost zero consumption - Passivhaus (ECCN-PH)", which allows to identify the habits of people in their buildings and how users adapt to new technologies .

The report reveals in depth how users adapt to new technologies in passive housing, their current habits and their confidence in institutions and companies in the energy efficiency market.

It is at a key moment of transition to almost zero energy housing and studies such as this can allow us to successfully face the imminent implementation of the new regulations on energy efficiency in buildings.

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To carry out the study, 1.100 surveys have been carried out throughout Spain and the methodological approach has been aimed at determining how the ECCN-PH changes energy saving and efficiency practices, based on current habits. The results allow to identify which are the user's practices in their home in relation to their adaptation to the ECCN.

The work is divided into four chapters. The first deals with the general framework of the research and the approach under which it will analyze the data, results and conclusions. The second is oriented to the analysis of the survey and its relationship with the key aspects of the study.

The third proposes results based on the main needs and the fourth chapter determines the key concepts of the transition from the practices of conventional buildings to the ECCN-PH.

The climate, a key element of comfort
The analysis detects that climate is the element that governs the relationship between the user and the space he inhabits. It is, therefore, one of the factors that most affects the feeling of comfort. The challenge of buildings with almost zero energy consumption is to establish a more balanced relationship between what the user asks of their home and what their home can do.

According to the results, the user intervenes constantly in the house to feel comfort; opens and closes windows, cools and warms according to the interior temperature, gets used to certain noises in the facilities, etc., has the feeling that if it does not act actively, the house does not respond.

The ECCN pose a new scenario for the inhabitants since the passive house works permanently without the need of the user intervention to achieve a comfortable temperature.

The 76,27% of users open the windows to ventilate
The vast majority of people ventilate their home every day because it relates this action to greater well-being and comfort. Even so, the study shows that it is difficult to distinguish between ventilation (air quality) and temperature (cold / heat).

In a conventional building, the air quality is achieved through the opening of the windows, while the comfort temperature is achieved through conventional air systems. These systems, often, are fancoils, convectors or splits, and do not help generate a sense of comfort because they generate, currents, dust, noise and unequal temperatures.

On the contrary, in ECCN, a different logic is used: air quality is achieved with ventilation systems with heat recovery and comfort temperature is given by the use of passive insulation-enclosures.

The 76,27% of users open the windows to ventilate and achieve a healthy indoor air. Therefore, it is important to reinforce the idea that natural ventilation can also be done through mechanical ventilation systems (VMC) and that, the latter, are not only more ecological - since not opening windows there are no oscillations thermal and, consequently, energy expenditure- but more efficient and healthy.

This change of paradigm that consists in understanding a mechanical system as something natural and reliable, is one of the important challenges that the construction sector of ECCN must face.

The driving companies of the project were Zehnder, Griesser, Knauf Insulation, Inn-Solutions, Roto Frank, ePower & Building and Passivhaus Consulting.

Santiago Jaramillo
Author: Santiago Jaramillo
Editor

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