Controlled Mechanical Ventilation in Buildings: A Comparison between Energy Use and Primary Energy among Twenty Different Devices

Abstract

Indoor air quality (IAQ) of buildings is a problem that affects both comfort for occupants and the energy consumption of the structure. Controlled mechanical ventilation systems (CMVs) make it possible to control the air exchange rate. When using CMV systems, it is interesting to investigate the relationship between the useful thermal energy requirements for ventilation and the energy consumption of these systems. This paper addresses whether there is a correlation between these two parameters. The methodology used in this work involves the application of equations of technical Italian regulations UNI/TS 11300 applied to a case study. The case study is represented by a 54 m 3 room, which is assumed to have three CMV systems installed (extraction, insertion, insertion and extraction) for twenty different devices available on the market. Afterwards, simulations of useful thermal energy requirements Q H,ve and primary energy E P,V were performed according to the electrical power of each fan W and the ventilation flow. The results show that the two values are not linearly correlated: it is not possible to clearly associate the operating cost for CMV systems according to building requirements. The study also shows that CMV systems are particularly efficient for high-performance buildings, where there is no leakage that can be ascribed to windows infiltrations.

Indoor environmental quality of the Valli Theatre: outcomes on sound, light and thermo-hygrometry

“…The works started in 1852 but the necessity of more funding brought to the idea of selling the boxes, that had been bought by aristocrats and nobles, other than professionals belonging to the middle class [4]. Many of the buildings adjacent to the project site were demolished in order to obtain materials useful for the erection of the new construction [37][38][39][40].…”

Using natural fibre insulators on green roofs: some considerations

“…Calculations were carried out with Termolog Epix 10 [30] based on UNI 10349 for the climatic data of the zone "E", and the UNI 11235 [31], for the realization of scenarios. Moreover, some other aspects related with economic aspects of energy enhancements or related factors [32] as multiscale analysis [33], confidence intervals [34], parametric assessment [35] variaton of thermal conductivity [36] and other mechanical aspects [37] were considered but not reported in this paper.…”

Validation and application of three-dimensional auralisation during concert hall renovation

“…In general, the overall indoor quality in buildings includes high level of sound insulation from external and internal noise, 2,3 high level of thermal comfort especially without any specific heating system, also balancing costs and performance, 4,5 high levels of air quality and light distribution. 6 These aspects are particularly relevant for theatres and opera houses, where the overall subjective evaluation depends not only on sound propagation but also on other aspects.…”