4.7 Article

Control strategies for Energy Recovery Ventilators in the South of Europe for residential nZEB-Quantitative analysis of the air conditioning demand

Journal

ENERGY AND BUILDINGS
Volume 146, Issue -, Pages 271-282

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.enbuild.2017.04.058

Keywords

Energy recovery ventilator; Residential dwellings; Mediterranean climate; nZEB

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Mechanical ventilation systems are essential for ensuring the indoor quality of air in nZEB (nearly Zero Energy Buildings) with a high level of airtightness. In cold countries, it has already been demonstrated that Heat Recovery Ventilators (HRV) recovering the sensible energy from air ventilation are needed to achieve the energy demand goals for nZEB set by Passivhaus. In tropical areas with hot temperatures and high relative humidity in the ambient air, the necessity of recovering latent and sensible energy with Energy Recovery Ventilators (ERV) has also been demonstrated. However, in warm climates with medium relative humidity levels, for example in cities located on the Mediterranean coast, the evaluation of the effectiveness of an EVR for residential buildings has to be analyzed and optimized. This article establishes the effectiveness of several control strategies for ventilation air systems including ERV with the aim of optimizing the air conditioning energy demand of dwellings located in several cities in the South of Europe. Possible control strategies have been analyzed to minimize the undesirable operation of ERVs which could otherwise increase the air conditioning energy demand for winter and summer seasons. The impact of the latent effectiveness and the effect of free-cooling on the air conditioning energy demand is also studied. (C) 2017 Elsevier B.V. All rights reserved.

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