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Responding to the hot humid climate, the Taiwan government expects to broadly install air-conditioning in classrooms to provide a comfort study environment for school buildings and prevent the risk of overheating; therefore, corresponding to the installation of air-conditioning, it is important to draw up the energy-saving strategy while considering the thermal comfort.

Portable air cleaners have demonstrated their effectiveness in reducing indoor PM concentrations. Common rating systems assume the air cleaner is in a room having limited air exchange with ambient air and the rest of the building. In this analysis, we model conditions in which people operate air cleaners in rooms with some natural ventilation. METHODS: A simplified mass balance model was developed for a 50 m3 room within a 350 m3 home, assuming well-mixed spaces, homogeneous infiltration, and applying the LBLX ventilation model.

In this study, questionnaire survey and field measurement were conducted for the houses with the elderly in urban and rural areas across 6 regions of China, during heating period. As the results, the prevalence of hypertension was found around 40% in both urban and rural areas. In the northern regions, the room temperature in urban residences was stable at around 20°C, and in rural areas this temperature rarely reached 20°C but it fluctuated greatly.

The current research investigates the relative humidity conditions in Swedish dwellings (678 apartments and single-family houses), comparing measurements from the 2007/2008 BETSI-survey (heating season), with the recommendations of the EN 16798:2019. Analysis shows that 61.4% of the apartments and 29.8% of the single-family houses belong to Cats. 3 and 4, which correspond to moderate and low level of expectation, respectively (mainly due to low relative humidity).

In this extended abstract, we introduce the new IEA EBC Annex on 'Energy Efficient IAQ Management in residential buildings'. In this Annex, we address a number of challenges in implementing smart IAQ management strategies. 

Annex 68 provided us with a general framework for integrated simulation and assessment of Energy Efficiency (EE) and chemical indoor air pollution. This framework can now be further extended to develop and assess a series of smart Indoor Air Quality (IAQ) management strategies. 

As the energy poverty cannot afford the energy expenditure, their indoor environmental quality (IEQ) was affected by diverse problems from low energy efficient residential buildings. Thus, it is important to identify IEQ of energy poverty`s residential buildings to improve their well-being. However, there is no specific and diverse data on the IEQ of energy poverty in low-income housing in South Korea due to the difficulty of reaching many households and managing an amount of survey data.

ASHRAE ’s Residential IAQ Guide, published in 2018, contains practical and actionable strategies directed at multiple audiences, including builders, designers, occupants, whether they rent or own, and managers of multifamily buildings. It does this while also providing a compendium of sound scientific information for professionals who specialize in IAQ, home energy, commissioning, and those who develop programs and standards intended to transform industry practices. 

The book of proceedings of the 13th International BUILDAIR Symposium "Airtight Buildings, Thermography and Ventilation Systems in Practice",  held on June 2-3  2023 in Hannover, Germany. Contains 36 abstracts.

Worldwide, the demand for airtightness tests of tall buildings with a height of approximately 100 m is increasing. This report provides information on the planning and measurement concept for testing the entire building as a “single-zone” and presents the results and findings of the airtightness tests. The test set-up and the tests as such are based on the Passive House Institute's Guide to Measuring Tall Buildings [5] which includes recommendations that go beyond the ISO 9972 standard.

Purpose of the work 
According to the two Swiss building standards Minergie-P and Minergie-A, individual dwelling units are considered measuring zones for airtightness, irrespective of whether they are in a new, renovated or modernized building. The Minergie standards focus on comfort between the dwelling units and the energy losses caused by infiltration. 
Do zone measurements meet relevant requirements? Which requirements do the zone measurements fail to meet?