Advances in Ventilation and Energy Saving for Healthy Indoor Ambiences

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Energy Science and Technology".

Deadline for manuscript submissions: closed (20 August 2021) | Viewed by 2618

Special Issue Editor

Special Issue Information

Dear Colleagues,

From the beginning, the term “indoor air” has been a research area with two main handicaps—to control the quality of the indoor environment and to improve the ambiance through thermal comfort conditions with a lower energy consumption. In this sense, because of the reduced dimensions of indoor ambience and the different emission sources placed indoors, a better solution to ensure these objectives is to ventilate and renovate indoor ambience with clear outdoor air. Despite this, because of old contaminants, like radon emission sources and new ventilation needs, for example the COVID-19 pandemic ventilation requirements, this tendency to ventilate indoor environments is increasing far beyond what it was before, and, as a consequence, has resulted in higher energy consumption and a reduction in indoor thermal comfort. Finally, this problematic situation is aggravated when outdoor air is of low quality, such as in some polluted cities, with the only solution being to implement previous air renovation with different indoor air cleaning technologies, as defined by one of the main objectives of the international energy agency (IEA) in Annex 78. 

With the aim to inspire future research activities and ventilation standards, this special issue is making a call to researchers to agglutinate different ventilation solutions in order to define new air cleaning technologies or, in general, to define or improve knowledge about indoor air ventilation.

Prof. Dr. José A. Orosa
Guest Editor

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Keywords

  • Ventilation
  • Indoro ambiences
  • Indoor pollutants
  • Energy saving
  • Buildings design
  • Thermal comfort

Published Papers (1 paper)

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Research

25 pages, 5696 KiB  
Article
Ventilation Systems and Their Impact on Nanoparticle Concentrations in Office Buildings
by Henrik Olstrup, Annika Hagenbjörk and Hans Orru
Appl. Sci. 2021, 11(19), 8930; https://0-doi-org.brum.beds.ac.uk/10.3390/app11198930 - 25 Sep 2021
Cited by 2 | Viewed by 2031
Abstract
Nanoparticles (NPs) can infiltrate indoor environments and have a large impact on human health when inhaled. Thus, indoor air quality is highly dependent on the outdoor air and on the filters used in the ventilation systems. In the NanoOffice study, the concentrations and [...] Read more.
Nanoparticles (NPs) can infiltrate indoor environments and have a large impact on human health when inhaled. Thus, indoor air quality is highly dependent on the outdoor air and on the filters used in the ventilation systems. In the NanoOffice study, the concentrations and the size distribution of NPs were measured with a five-minute time resolution in twelve office buildings in Umeå. Measurements were taken with an SMPS 3938 during a one-week period in the heating and nonheating seasons. Large differences in ventilation between buildings appeared, despite the fact that similar MVHR ventilation systems were used, and most of them were equipped with F7 filters. The NP concentrations and the simultaneous ventilation flows were measured in buildings with a variable and a more constant ventilation flow. In some cases, an increase in NP concentration could be seen after ventilation turn-on or after an increase in the ventilation flow. There was also one case where the NP concentrations increased in connection with the ventilation being switched off or reducing its flow. However, variable NP concentrations were also shown in buildings with a fairly constant ventilation flow, which was prominent for the two buildings located closest to busy streets. The correlation coefficients between the ventilation flow and particles in different size classes were in general smallest for particles in the smallest size classes, indicating higher filtration efficiency. Full article
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