Ventilation has a fundamental role to improve thermal comfort and Indoor Air Quality (IAQ) in Nearly Zero Energy Buildings (NZEB), characterized by high energy performances and airtightness of building envelope. This paper focuses on a terraced building, "Passivhaus" standard, in Mediterranean climate (Brindisi - Italy), with windowed side faces to north and south, and a central courtyard. Two controlled natural/hybrid ventilation systems have been hypothesized, the first is a self-regulating natural ventilation system (VNC) typically adjusted for control of IAQ during the winter, the second is a hybrid system, mechanical ventilation with canadian well (VMC), more appropriate for cooling needs. The ventilation systems design require quantitative analysis on airflow paths and related building interactions. For this purpose, the study has combined the use of a dynamic energy modeling software (TRNSYS) with a multi-zone air flow model (CONTAM), and a Computational Fluid Dynamics analysis (CFD0 Editor) to study the effects of wind around buildings. Simulations have shown a significant reduction of the relative humidity levels (values in the 40-60% range) in winter and the reduction of overheating in summer, evaluated according to the adaptive comfort theory (EN 15251-2007).

Sistemi di ventilazione controllata in edifici NZEB in clima mediterraneo - Controlled ventilation systems in NZEB buildings in mediterranean climate

Francesco Iannone
;
2016-01-01

Abstract

Ventilation has a fundamental role to improve thermal comfort and Indoor Air Quality (IAQ) in Nearly Zero Energy Buildings (NZEB), characterized by high energy performances and airtightness of building envelope. This paper focuses on a terraced building, "Passivhaus" standard, in Mediterranean climate (Brindisi - Italy), with windowed side faces to north and south, and a central courtyard. Two controlled natural/hybrid ventilation systems have been hypothesized, the first is a self-regulating natural ventilation system (VNC) typically adjusted for control of IAQ during the winter, the second is a hybrid system, mechanical ventilation with canadian well (VMC), more appropriate for cooling needs. The ventilation systems design require quantitative analysis on airflow paths and related building interactions. For this purpose, the study has combined the use of a dynamic energy modeling software (TRNSYS) with a multi-zone air flow model (CONTAM), and a Computational Fluid Dynamics analysis (CFD0 Editor) to study the effects of wind around buildings. Simulations have shown a significant reduction of the relative humidity levels (values in the 40-60% range) in winter and the reduction of overheating in summer, evaluated according to the adaptive comfort theory (EN 15251-2007).
2016
Colloqui.AT.e 2016
978-88-492-3312-4
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/254420
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