Track: Fundamentals and Applications
Sponsor: 2.1 Physiology and Human Environment, REHVA
Chair: Jaap Hogeling, Dr.Ing., Fellow ASHRAE, REHVA, Brussels, Belgium

Residential ventilation systems for nearly zero energy building design and operation requires new approaches. New European energy performance standards supporting these design procedures are being presented. Smart residential ventilation systems to reduce energy use in North America are discussed. European design guidelines on high performance mechanical ventilation systems with heat recovery with room based airflow rate selection procedure and sizing principles with compensated cooker hood are provided. Common installations in new and renovated buildings are shown. An example of a design solutions is illustrated. Procedures for assessing ventilation rates based on CO2 as tracer are presented.

1. Mechanical Ventilation in NZEB Cortau House in Italy: Theoretical Performance, Real Effects and Occupants’ Expectations
Stefano Corgnati, Ph.D., P.E., Associate Member, REHVA, Brussels, Belgium
CorTau House is a building design and constructed following the NZEB principles. One of the key challenges of the design was the integration of mechanical ventilation with heat recovery and dehumidification in summer, allowing the suitable integration with radiant floor used for cooling purposes too. The regulation and control of mechanical ventilation in actual operation conditions is fundamental if the energy performances calculated at design stage wants to be obtained in reality. Training of occupants is needed, as a change of the habits related to opening/closing windows and to interacting with control systems is crucial

2. CEN Standard Methodology for Energy Requirements in Residential Ventilation
Livio Mazzarella, Ph.D., P.E., Politecnico di Milano, Milano, Italy
Under European Commission mandate, CEN had just publishing new updated standards to support the energy performance assessment of Nearly Zero Energy Buildings. Among these, several standards have been developed on energy requirement for ventilation for both residential and non-residential buildings. This presentation focuses on the impact that the CEN performance calculation procedure can have on designing NZEB buildings, which energy performance have to comply with performance limits assessed through such standards.

3. Residential Ventilation Standards and NZEB Homes in North America
Max Sherman, Ph.D., Fellow ASHRAE, LBL, Berkeley, CA
As high-performance homes reduce the thermal loads through the envelope, the energy required to provide minimum ventilation because a more and more important fraction of the total energy. ASHRAE Standard 62.2 provides a relatively high-degree of flexibility that allows homes to provide acceptable indoor air quality at significantly reduced energy costs. In addition to heat or energy recovery systems, standards 62.2 allows dynamic controls of ventilation rates to respond to demand and outdoor conditions. Such smart ventilation systems are discussed during this presentation.

4. New REHVA Guidebook on Residential Heat Recovery Ventilation: System Layouts, Sizing and Typical Solutions
Jarek Kurnitski, Tallinn University of Technology, Tallinn, Estonia
NZEBs are well insulated, airtight and with good sound insulation. Therefore, balancing of ventilation, including the operation of cooker hood, as well as low noise levels are much more crucial issues than in older buildings. New information for designers and contractors to design and size a high performance mechanical supply and extract ventilation system with heat recovery is presented. Room based airflow rate selection procedure and sizing principles for constant pressure system with compensated cooker hood are provided. A simplified noise calculation procedure is introduced. The specific energy consumption and new ISO filter classification are introduced.

5. Implementing New and Classical CO2 Tracer Gas Methods for the Assessment of Ventilation Indicators in Residential Buildings
Manuel Gameiro da Silva, Ph.D., Member, University of Coimbra, Coimbra, Portugal
Being naturally generated by buildings’ occupants, CO2 is many times selected as the tracer gas. A mathematical model for the time evolution of a contaminant in a uni-zone confined compartment is presented. The most common CO2 meters are addressed. Various possibilities to develop AER from the curve fitting of experimental data will be explained, discussed and compared. A recent method based upon the response of CO2 indoor concentration to the cyclic changes of its outdoor concentration, during non-occupancy periods, are introduced. Pros and cons of proposed methods will be discussed

Presented: Sunday, January 21, 2018, 1:30-3:00 PM
Run Time: 90 min.

This is a zip file that consists of PowerPoint slides synchronized with the audio-recording of the speaker (recorded presentation), PDF files of the slides, and audio only (mp3) for each presentation.