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The assessment of surface condensation risk in dwellings. The influence of climate in Spain

Surface condensation risk is a fact that has to be dealt with when buildings are airtight. Airtight buildings with lower ventilation rates are the result of applying energy saving policies and criteria. Surface condensation risk depends greatly on the ventilation rates, as well as on another factors such as generation of water vapour, climate, envelope components and U value, etc.

Characteristics of ultrafine particle emission change depending on the placement of ventilation systems in 3D printer working environment

This study evaluated the emission characteristics of ultrafine particles emitted during material extrusion type 3D printer, called Desktop 3D printer, operation in the test bed and mock-up environmental conditions respectively. For the measurement, a condensation particle counter (CPC) and scanning mobility particle sizer (SMPS) were employed. In the test-bed evaluation, representative materials widely used nowadays such as ABS, PLA, TPU, PC, etc, emitted higher than the UFP criteria (3.5 ×1011) of 2D printer test method RAL-UZ 171.

The Assessment of Particulate Matter (PM2.5) Removal Efficiency on Air Cleaner Products through Full Scale Test in Korea

This study is designed to investigate the particulate matter removal efficiency of domestic air cleaner products and seeks to compare the particulate matter removal efficiency in a laboratory with that in real life. 

The impact on indoor air of bio-based insulation materials: effect of humidity and potential mould growth

Bio-based insulation materials represent an alternative to petro-based materials which may contribute to enhance buildings energy efficiency. Nevertheless, these material must respond to indoor air quality requirements and prove their resistance to moulds. In this study, VOCs emissions of a wood fibre board were characterised at 50% and 85% of relative humidity (RH) as well as its potential to mould growth. Relative humidity variation impacted significantly some VOCs emissions and colonies from Aspergillus niger developed onto the material.

Ventilation improvement for make-up air supply system cooking-generated indoor particles

Cooking activities generate massive fine particulate matter (number concentration). Effective ventilation system can improve the indoor air quality impacts of pollutants from residential cooking. Make-up air supply system can improve the range hood and Indoor air quality. In this study, we measured a capture efficiency of range hood with make-up air supply and indoor particles during cooking activates. For household’s comfort, make-up air supply was installed the line diffuser type. Case 1 PN concentrations increased to around 60,000#/cm3.

Indoor particle concentration related to occupant behavior of Korean residential buildings

In recent years, PM, which is one of the most important indoor air pollutants, has attracted a great deal of attention. PM is mainly generated by occupant activities. In particular, cooking and smoking are occupant activities that have the greatest effect on the indoor PM concentrations. The objective of this study is to analyse indoior PM concentration and occupant behavior of Korean residential buildings. PM concentration increased rapidly in a short time during the cooking process.

CFD analysis of the optimal installation location of adsorption material in two ventilation conditions in residential buildings: natural convection and mechanical ventilation

Recently, many studies have focused on the adsorption of pollutants as a method for improving indoor air quality. In Korea, the Health-Friendly Housing Construction Standards specify requirements for the installation of pollutant-absorbing materials. It is recommended that at least 10% of the total area of the living room and bedroom walls be covered. However, current guidelines regarding the installation locations of the adsorption material are unclear.  

Validation of a Digital Twin with Measurement Data

The research objectives of this study are to develop and validate a detailed simulation model of a test cell which was used to measure heat balances for comfort evaluation. 

Optimal control strategy of air-conditioning systems of buildings requiring strict humidity control

This paper presents a model-based optimal control strategy for multi-zone air-conditioning systems with strict humidity control. An adaptive full-range decoupled ventilation strategy is adopted for optimizing the set point of the outdoor air flow rate to minimize the energy cost as well as to achieve the temperature and humidity controls. Tests were conducted to evaluate the energy performance of the proposed control strategy.

Cooling and Heating performance of Ceiling Radiant Textile Air Conditioning System with PAC

There are two types of air conditioning systems, convective and radiant air conditioning system. Radiant air conditioning systems have attracted many people’s interest due to the high capabilities of energy saving and maintaining a comfortable indoor environment at the same time. However, it is difficult to install this system and maintain system performance. There is also a problem about the drought from convective air conditioning system.