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This paper proposes a novel methodology to predict thermal comfort states of occupants with k-means approach. The approach is embedded into an optimization problem, which is used to locate optimal operating conditions via Augmented Firefly Algorithm (AFA), for improving energy efficiency of buildings and maintaining satisfactory indoor thermal comfort states in the meantime. The neural networks models...
Majority of energy consumption in Singapore buildings is due to air-conditioning, because of its hot and humid weather. Besides attaining a healthy indoor environment, a prior knowledge about the occupant's thermal comfort can be beneficial in reducing energy consumption, as it can save energy which is otherwise spent in extra cooling. This paper proposes a data-driven approach to predict individual...
The issue of diminishing global energy resources has been of significant concern in recent years. One of the most energy hungry components is the Air-Conditioning and Mechanical Ventilation (ACMV) Systems for buildings, which consumes more than 40% of the total building energy consumed on average. Since people are spending more time staying indoor, the indoor environmental conditions have to be taken...
In the paper there are presented the problems of optimal control for indoor thermal comfort in classroom equipped with HVAC (Heating, Ventilation and Air Conditioning) systems. It is very important that the design of such HVAC control systems allows to minimize the energy consumption and to maximize microclimate comfort sensation. There are discussed the results of modeling the classroom using building...
A climate change simulation framework for intelligent green building adaptation design is proposed. The simulation framework is developed for studying environmental performance of existing or proposed green buildings under present and future urban microclimate conditions. It draws on a synthesis of environmental computer simulation in three areas: (1) overall climate change scenario modelling at city...
People working indoors often respond very differently to levels of thermal comfort in the office, which is directly related to health and work efficiency. Up to now, the dilemma of thermal comfort for all and energy efficiency in the process remains unsolved. A local dynamic thermal comfort model is established in this paper based on the CFD software. Local parameters are designated and all-around...
This paper presents a numerical simulation based on computational fluid dynamics (CFD) method on the enhancement of natural ventilation in an industrial workshop with heat source induced by solar chimney (SC). Four types of SC were designed to attach to the top and southern roof of the workshop. Realizable k-ε turbulent model and DO (discrete ordinate) radiation model were used to calculate the air...
This paper is the second one in a series of two papers presenting the main results obtained, which are analyzed in view of the present RSECE Portuguese national regulation.
The central air-conditioning system which runs under the mode of fresh air mixed with return air doesn't take full advantage of the fresh air to remove air conditioning load, leading to high energy consumption and carbon emission. The calculation model for carbon emission reduction of all-fresh air operation in central air-conditioning system is proposed based on the air conditioning control strategies...
The concept of potential for natural ventilation (NVP) is defined as the possibility, or probability, to ensure both indoor air quality and thermal comfort by natural ventilation. NVP value can provide the designers significant information to properly design and arrange natural ventilation strategy at the preliminary or conceptual stage of ventilation and building design. In 2005, Lina Yang presented...
A half-year field study of the thermal environment in rural houses in Western Sichuan Province was conducted from Jan. 2009 to Aug. 2009. In this recent study the Predicted Mean Vote (PMV) is justified to be improper to some free-running buildings until some necessary revision is made. What's more, the study indicates that the distinctive deviation between the PMV and Thermal Sensation Vote (TSV)...
Wind ventilation performance within high rise residential estates is important because it affects thermal comfort of pedestrians, indoor and outdoor air quality, and energy consumption in domestic sector. For effective utilization of natural ventilation, research and references in this area are highly needed. This paper presents a comparison of the wind ventilation performance of three typical residential...
Task conditioning aims to provide each occupant with personalized clean air direct to the breathing zone. Microenvironment of a typical office workplace consisting of different task air conditioning system, such as CMP (computer monitor panel), MP (movable panel), horizontal desk grill (HDG) and vertical desk grill (VDG) are studied by numerical simulation. Numerical simulation by k-epsiv 3-D turbulent...
The indoor environmental quality (IEQ) is examined from the prospect of an occupantpsilas acceptance in four aspects: thermal comfort, indoor air quality, noise level and illumination level. This paper proposed a fuzzy synthetic evaluation with changeable weights to approximate the overall IEQ acceptance of a certain indoor environment. Different evaluation factors have different influences in FSE,...
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