Heat recoverers, how to reduce your energy expenses?
superadmin
December 23, 2016
In this article we will explain the advantages of installing heat recoverers for an efficient renovation of the existing real estate stock, as well as the important role these ventilation system components play in obtaining the energy certificate rating of residential properties in a multi-family building.
The trend in Europe towards NZEBs
Since the European Union, through directive EU 2010/31, promotes and sets guidelines for NZEBs, Nearly Zero Energy Buildings, heat recovery systems are important to achieve this goal.The Energy Efficiency in Buildings Directive (DEEE) stipulates the guidelines to be followed to promote nearly zero energy consumption buildings and what practices must be followed to ensure that all new buildings are nearly zero energy consumption buildings before the end of 2020. The document considers that buildings are of utmost importance in the EU’s energy efficiency policy, as they represent almost 40% of final energy consumption. However, the current real estate stock is old and inefficient, and its renewal is moving slowly. In line with the DEEE, it is necessary for existing buildings to be gradually and efficiently renovated to achieve similar levels of efficiency. Therefore, the Directive requires member states to implement supportive policies that encourage the adaptation of this real estate stock.
What is a nearly zero energy consumption building?
According to Article 2, paragraph 2, of the DEEE, it is an "building with a very high level of energy efficiency. The almost null or very low amount of energy required should be covered, to a very large extent, by energy from renewable sources, including energy from renewable sources produced on-site or in the vicinity." This definition implies that renewable energy and efficiency measures go hand in hand. Once installed in buildings, renewable energy will reduce the amount of net supplied energy. In many cases, unless complementary energy efficiency measuresare adopted, or unless significant reductions in primary energy factors are brought about for renewable energy sources, onsite renewable energy will not be sufficient to bring energy consumption down to a nearly null level.What is the energy efficiency of a "nearly zero energy consumption building"?
We understand the energy efficiency of a building to be the "calculated or measured amount of energy needed to meet the energy demand associated with normal use of the building, which will include, among other things, energy consumed for heating, cooling, ventilation, water heating, and lighting."Guide to energy saving and recovery in ventilation and air conditioning systems
Air heat recoverers in extraction systems in air conditioning allow for maintaining adequate indoor air quality without penalizing the energy of the hygroscopic adaptation systems of the air driven to the premises. The use of heat recoverers in ventilation and air conditioning systems allows for utilizing the residual sensible and latent heat from the process itself, achieving:- Reducing the energy plant (investment costs).
- Reducing operational energy consumption (operating costs).
Be more energy efficient both in your ventilation system and in your neighbors'
There are systems on the market that help reduce the energy expenses of homes:- On one hand, the Decentralized Double Flow Ventilation System. It consists of the installation of a device placed on the facade of each of the homes in a multi-family building. Ideal for rehabilitation projects that have little space, the decentralized double flow ventilation works according to the principle of controlled supply and extraction of air in dry rooms, complemented by controlled extraction in humid rooms. In the process, the heat exchanger takes care of recovering the extracted air and thus heating the air supplied to the interior of the home.
- On the other hand, the Centralized Double Flow Ventilation System. It is a ventilation system with two collective extractors on the roof (one group for supplying new air from the outside to bedrooms and living rooms, and another group for extracting stale air from kitchens, bathrooms, and toilets). Since each home has its own heat recoverer, up to 94% of the heats from the extracted air can be recovered.
Siber Ventilation
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