A systematic analysis of ventilation efficiency of indoor climate in buildings is required. The article gives the strategy of that procedure and individual parameters of thermal environment and indoor air quality that must be taken into account. The discrepancies between the actual and projected values is limited. The same applied to energy use. Besides the analysis of air velocity at analyz ed spot the assessment and evaluation of local air turbulence intensity is necessary as well.
For state of the art buildings ventilation heat loss can exceed 50 percent of the total heat loss of the building. Balanced ventilation systems with heat recovery from the exhaust air lead to bjg costs for ducts. Alternatively, the incoming air of exhaust ventilation systems can be pre-heated by curtain wall facades. A newly developed simulation program for transient analysis of curtain wall systems is validated by measurements. Parameter studies for pre-heating air with curtain walls are presented. Location, orientation, construction, and geometry are considered.
Ventilation systems with heat recovery offer several advantages such as, of course, energy savings but also the possibility to add acoustic and filtration treatment. This study was to evaluate the thermal performances of such systems for residential ventilation in France. These units usually combine exhaust and supply fans, filters and a heat recovery exchanger. To test them, a special draft is being written by the CEN experts of TC 156/WG/AH7.