Jun Guan

• PhD
• Professor (Associate) at Nanjing University of Science and Technology

Human-related emissions had been proved to be crucial sources of indoor volatile organic compounds (VOCs) in densely occupied spaces. However, more work was needed on quantifying human emissions on indoor VOCs in actual densely occupied spaces. This study intended to investigate possible emission sources and their contributions to indoor target VOC...

Characterization of indoor ultrafine particles (UFPs, diameter <100 nm) in residences has been of great interest. However, insufficient information was presented with respect to the characteristics of typical occupants’ activities and indoor UFP source emissions under actual conditions. In this study, a field investigation including questionnaire s...

Although significant progress had been made in characterizing indoor volatile organic compounds (VOCs) during the past decades, much was unknown considering the impact of human emissions on indoor VOCs in actual densely occupied spaces. In this context, this study investigated the indoor VOCs in densely occupied education buildings of four universi...

Human activities have been proven to be one of the most important sources of indoor volatile organic compound (VOC) emissions, especially in densely occupied environments. However, characterization of temporal variation and its impact analysis of indoor total volatile organic compounds (TVOC) have not been presented adequately. In this study, indoo...

Under the background of current shortage of energy and pollution of environment, efficient control and collaborative optimization strategies for building energy consumption and indoor environmental quality had aroused great concern. However, the optimization of building energy consumption and environmental system was deemed as a comprehensive, iter...

A simulation method of stochastic heating behaviors in residential communities is developed, which is helpful to accurately predict regional dynamic electricity loads. In this method, the corresponding relationship among the structure of family members, the ownership and the locations of heat pumps should be established for each family firstly. The...

The lack of empirical data demonstrating the relationship between influencing factors and building energy performance is one of the primary barriers in energy efficiency management. A citywide residential energy information database and the data-based analytical methodology help increase the knowledge about the local real estate situation, explore...

Accurate grasp of district power demand is of great significance to both sizing of district power supply and its operation optimization. In this study, an index system has been established and visualized through a Geographic Information System, for revealing both temporal and spatial characteristics of district power loads caused by heating/cooling...

Characterization of indoor aerosols in aircraft cabin has been of great interest. However, few studies have presented investigations of ultrafine particle (UFP) concentrations in actual aircraft cabin environment. In this study, we presented the characteristics of UFP number concentration levels, size distributions and temporal variations in fourte...

Ultrafine particulate matters (PM0.1) are closely related to indoor air quality, which has been proved to do great harm to the human health. The behaviors of human habitation, such as window-opening can influence indoor air quality to a great extent. In this study, a single room was established as a physical model. The simulation analysis method wa...

As the demonstration of eco-communities, energy planning becomes more and more important for university campus. However, insufficient energy use data accumulation has been a significant barrier against fully understanding of energy use characteristics, and demand load features of campus buildings, which usually provide the basic support for energy...

Energy efficiency retrofit of residential buildings, widely carried out in north China, has been aroused a great concern during recent years. In this case, one typical residential building with energy efficiency retrofit was selected in Tangshan as a case study. Indoor thermal environment and space heating use of the building were measured before a...

Volatile organic compounds (VOCs) are one of the most important types of air pollutants in aircraft cabin. Balancing source intensity of VOCs and ventilation strategies is an essential conducive way to obtain acceptable aircraft cabin environment. This paper intends to develop a simplified model by a case study to estimate the net VOC emission rate...

Energy use in university campus plays an important role in energy use of the society, because universities are complex infrastructure and they are similar to small towns. A university campus consisted of 35 buildings, with total area of approximately 300 000 m² was analyzed. Six-year energy uses of electricity and heating of 24 buildings in one uni...

The presence of volatile organic compounds (VOCs) in the air of aircraft cabins was studied to identify possible emission sources and their contributions to aircraft cabin VOC concentrations. A total of 84 sampling events were included during 14 different flights. Based on the measured VOC concentrations, a receptor model using positive matrix fact...

Volatile organic compounds (VOCs) are an important class of air pollutants in aircraft cabin. The present study aimed to measure the VOC concentrations and determine possible correlations between selected VOCs in samples of 14 domestic flights in China. Alkanes and alkenes, aromatics, and aldehydes were the most abundant compounds on 9 flights, 4 f...

Volatile organic compounds (VOCs) have aroused concerns in aircraft cabin environment. To optimize VOC control strategies in cabins, six commercial flights were selected to continuously monitor the total VOCs (TVOC) in cabin air. CO2 concentration values as a ventilation tracer measured in supply air and re-circulated air for calculating ventilatio...

Airborne particles are an important type of air pollutants in aircraft cabin. Finding sources of particles is conducive to taking appropriate measures to remove them. In this study, measurements of concentration and size distribution of particles larger than 0.3 μm (PM>0.3) were made on nine short haul flights from September 2012 to March 2013. Par...

To better understand the overall VOC levels and their key influencing factors in aircraft cabin, we conducted in-flight measurements in 51 randomly selected flights by quantitative methods that were previously introduced in part I of this research program. Of those 51 flights, several potential influencing factors, including flight phases (N=51), m...

Recent air pollution issues have raised significant attention to develop efficient air filters, and one of the most promising candidates is that enabled by nanofibers. We explore here selective molecular capture mechanism for volatile organic compounds in carbon nanotube networks by performing atomistic simulations. The results are discussed with r...

To better understand the overall VOC species and levels and their key influencing factors in aircraft cabin, we conducted in-flight measurements in 107 commercial flights from August 2010 to August 2012. These flights were randomly selected and a sampling method using syringe was developed to obtain overall information of VOCs in actual cabins. On...

In Norway, a large proportion of school building stock originates from the period 1955 to 1987. Many of these buildings fail to comply with current building regulations concerning energy consumption. An excessive amount of energy is consumed, ventilation is unsatisfactory, and the resulting air quality and thermal climate have a negative impact on...

It is necessary to determine whether to implement a retrofit measure or not based on its energy saving and economic benefits, when conducting a retrofit project. The common way to do that is to set up a building simulation model and calculate its energy saving and economic benefits. Because of the great discrepancy between the actuality and the bui...

High volatile organic compound (VOC) concentrations following building decoration have been observed frequently. In reality, however, residents do not know the indoor VOC concentration levels until the buildings are tested, which seldom provides a preventive measure. While several indoor air quality (IAQ) simulation programs have been developed to...

Understanding how indoor volatile organic compound (VOC) concentrations vary with time would be helpful to estimate the long-term exposure and related risk. And yet, most existing studies either neglect the time factor, or only focus on short-term behaviors. In this study, we tracked the indoor VOC concentrations of a newly renovated apartment unit...

High volatile organic compounds (VOCs) concentrations after decoration have been observed frequently and they play a significant role in residents' health. In this paper, we measured the VOC concentrations of a new residential unit in Beijing over the decoration process. We then simulated the VOC concentrations using a newly developed, single zone...

The purpose of this research is to found a national statistical system of energy consumption in the residential building sector of China, so as to look into the actuality of residential energy consumption, and to provide data support for building energy efficiency work in China. The frame of a national statistical system of residential energy consu...

The purpose of this research is to find a statistical methodology to investigate the national energy consumption in the public buildings sector in China, in order to look into the actuality of the national energy consumption of public buildings and to provide abundant data for building energy efficiency work. The frame of a national statistical sys...

Based on analysis of uncertainty, this paper presents grey system theory to handle the “grey” characteristic of IAQ. Grey comprehensive analysis of indoor air quality reveals that we should pay more attention to the air purification and humidity control in the design and maintenance of HVAC. In order to represent grey characteristic of IAQ system,...