AIVC - Air Infiltration and Ventilation Centre

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energy efficiency

Energy performance of active polarization filters vs. conventional filters in HVAC systems

Pressure drop due to filters embedded in HVAC systems is one of the energy loss causes in building air conditioning systems, which can become important in large all-air systems with highly demanding filtering needs, such as hospitals, clean rooms, laboratories or pharmaceutical environments.

Radon concentration control by ventilation, and energy efficiency improvement

Radon gas is a pathological agent confirmed by World Health Organization in terms of increasing the risk of lung cancer generation when it is inhaled by human in high concentration. This gas comes from soils with uranium content (i.e. granite terrain) and penetrates through the building envelope, such, as floors or basement walls. Its accumulation in indoor spaces increases the radon concentration level, constituting a health problem for occupants. This can be handled by rehabilitation actions in buildings that reduce indoor concentration to acceptable levels.

Improvement of comfort and energy efficiency in existing buildings using adaptive thermal comfort algorithm

Comfort and energy saving are two important concepts treated in current buildings in order to maintain a good air quality reducing the energy consumption. According to International Energy Agency (IEA) buildings represent 32% of total final energy consumption, and the need for reduction of CO2 emission leads to pay attention to the energy demand in buildings. On the other hand maintaining a good-quality environment helps to improve the productivity and effectiveness of workers.

Monitoring results and optimization of a façade integrated ventilation concept for building retrofit

An office building of the Fraunhofer Institute for Solar Energy systems (Fraunhofer ISE) in Freiburg was retrofitted in 2012 with an innovative concept based on technology integration in the façade. Prefabricated window modules integrating air inlets and outlets, façade integrated air ducts and a heat and moisture recovery ventilation device were implemented. A long term monitoring was set up including energy, temperature, CO2 and humidity measurements.

Proposed change in Spanish regulations relating to indoor air quality with the aim of reducing energy consumption of ventilation systems

The ventilation required in order to maintain acceptable indoor hygiene standards results in a significant consumption of energy. Currently the Spanish regulations on indoor air quality (IAQ) require minimum rates for delivery-to and extraction-from the habitable rooms of residential buildings. These rates are not adjustable, so ventilation systems based on variable ventilation rates, are not normally deemed acceptable unless a comprehensive statement of compliance is provided, justifying the proposed ventilation solution.

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