Investigation of occupied/unoccupied period on thermal comfort in Guangzhou: Challenges and opportunities of public buildings with high window-wall ratio

Energy ◽  
2022 ◽  
pp. 123186
Author(s):  
Xing Xie ◽  
Xing-ni Chen ◽  
Bin Xu ◽  
Gang Pei
Keyword(s):  
Thermal Comfort ◽  
Public Buildings ◽  
Challenges And Opportunities

Energy Retrofitting and Thermal Comfort Improvement of the Public Buildings in Malaysia

2021 ◽  
Author(s):  
Aidin Nobahar Sadeghifam ◽  
Meheron Selowara Joo ◽  
Nurul Noraziemah Mohd Pauzi ◽  
Seyed Saeed Banihashemi Namini
Keyword(s):  
Thermal Comfort ◽  
Public Buildings ◽  
The Public

Experimental Investigation of the Indoor Thermal Comfort of the Public Buildings in the Typical Subtropical Climatic Region

2014 ◽  
Vol 525 ◽  
pp. 588-592
Author(s):  
Zhang Yuan Wang ◽  
Xiang Mei Zhang ◽  
Wan Sheng Yang
Keyword(s):  
Surface Temperature ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Internal Surface ◽  
Climatic Region ◽  
Public Buildings ◽  
Air Conditioning System ◽  
The Public ◽  
Indoor Thermal Comfort ◽  
Control Target

Aim of the paper is to investigate the indoor thermal comfort of the buildings. This work is undertaken by the combination of the literature review and experimental measurement and analyses, on basis of the selected 12 public buildings in Dongguan City (Guangdong Province, China), located at the typical sub-tropic climatic region. It was found that when the air-conditioning system was turned off, the internal surface temperature of the insulation was above a control target of 30°C; when the air-conditioning system was turned on, the internal surface temperature of the insulation was below the control target of 30°C, meeting the requirement of the thermal comfort of human body in summer. These figures will be helpful in the determination of the quantitative control target to improve the indoor thermal comfort in the subtropical areas.

scholarly journals The Effect of Ceiling Heating and Mechanical Ventilation on Thermal Comfort

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3712
Author(s):  
Balázs András-Tövissi ◽  
László Kajtár ◽  
Árpád Nyers
Keyword(s):  
Mechanical Ventilation ◽  
Thermal Comfort ◽  
Thermal Environment ◽  
Mechanisms Of Action ◽  
Public Buildings ◽  
Predicted Mean Vote ◽  
Radiant Temperature ◽  
Temperature Asymmetry

In the case of public buildings with ceiling heating and mechanical ventilation, radiant temperature asymmetry caused by the warm ceiling and draught occur simultaneously. The currently available literature does not offer an exhaustive description of the comfort conditions resulting from such a thermal environment. This research focuses on complementing the available knowledge, using instrumental measurements, as well as subject measurements carried out on 20 individuals. Relying on these measurements, the purpose of the research is to support the understanding of the combined mechanisms of action of the two local discomfort parameters. The main result of this research is that, if the predicted percentage dissatified is less than 6%, the radiant temperature asymmetry is in an interval of 5–15 °C, and the draught rate is 15% or 25%, the actual mean vote and the predicted mean vote values differ significantly, and the actual mean vote is always lower, with a few exceptions. In addition, the research highlights the changes of the actual mean vote caused by raising the draught rate from 15% to 25%, in the presence of radiant temperature asymmetry caused by warm ceilings.

scholarly journals Solar-shading systems designed to increase user satisfaction in public buildings, a case study of Britam Towers in Nairobi, Kenya

2021 ◽  
Vol 8 (4) ◽  
pp. 98-109
Author(s):  
Evans Kimani Njunge ◽  
◽  
Çilen Erçin ◽  
Keyword(s):  
Thermal Comfort ◽  
Energy Saving ◽  
User Satisfaction ◽  
Public Buildings ◽  
Public Building ◽  
Solar Shading ◽  
Glare Reduction ◽  
The Common

Solar-shading systems play various roles to the users of public buildings and may vary from user to user but some of the common user’s needs for these systems include; thermal comfort, energy-saving, daylight, and glare reduction. Understanding these needs can help Designers and Architects select from a wide array of Solar-Shading types and see which of them serves the needs of the users better. The Types of Solar-Shading Systems include either internal systems which are placed inside the building or can include external systems which are placed to the outside of buildings. To clearly understand the role Solar Shading Systems, play to satisfy Users’ needs, a case study of a Public Building in Nairobi, Kenya; Britam Towers, was selected. The case study found out that architects, designers, and developers play a preeminent role in coming up with projects that can better serve the User’s needs by creating designs that better suit the needs of the users have for using such Solar-Shading Systems. These designs may vary from building to building, region to region but the main withstanding factor to be noted is the functionality issue, as the Solar-Shading Systems should be able to meet the needs of users effectively and in turn, increase the user’s satisfaction.

scholarly journals Neural networks based predictive control for thermal comfort and energy savings in public buildings

2012 ◽  
Vol 55 ◽  
pp. 238-251 ◽  
Author(s):  
P.M. Ferreira ◽  
A.E. Ruano ◽  
S. Silva ◽  
E.Z.E. Conceição
Keyword(s):  
Neural Networks ◽  
Thermal Comfort ◽  
Predictive Control ◽  
Energy Savings ◽  
Public Buildings

Pathways for optimal provision of thermal comfort and sustainability of residential housing in hot and humid tropics of Australia – A critical review

2017 ◽  
Vol 27 (8) ◽  
pp. 1022-1040 ◽  
Author(s):  
Shokhida Safarova ◽  
Edward Halawa ◽  
Andrew Campbell ◽  
Lisa Law ◽  
Joost van Hoof
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Humid Tropics ◽  
Future Research ◽  
Wet Season ◽  
Residential Housing ◽  
Research Issues ◽  
Temperature And Humidity ◽  
Challenges And Opportunities ◽  
Air Speed

The optimal provision of thermal comfort and energy efficiency for residential housing in the hot and humid tropics presents challenges and opportunities for housing and subdivision designs. Climatic challenges come in the form of high ambient temperature and humidity, especially during the wet season and transition periods. On the other hand, climatic advantages come in the form of breezes coupled with relatively dry air during the dry season, enabling thermal comfort attainment through natural ventilation that employs prevailing breezes. This paper discusses existing design practices for housing and subdivisions in the hot and humid tropics with particular reference to the city of Darwin in Australia’s Northern Territory. This includes several research issues and gaps that have been identified and need to be addressed. The paper also critically assesses how air speed, air temperature and humidity – three of the thermal comfort parameters – play a key role in housing and subdivision design consideration in the hot and humid tropics. In doing so, the paper sheds light on the inadequacy of the current residential energy rating methodology as a tool for assessing tropical housing performance and proposes a new direction for future research to ameliorate these issues for the tropics.

Dominant Factors of Central Air Conditioning System Zoning and Thermal Comfort for Large-Scale Public Buildings in China

2010 ◽  
Vol 171-172 ◽  
pp. 159-162
Author(s):  
Wei Cai ◽  
Ke Jian Cai ◽  
Zhao Hui Wu
Keyword(s):  
Energy Consumption ◽  
Energy Conservation ◽  
Thermal Comfort ◽  
Air Conditioning ◽  
Large Scale ◽  
Simulation Software ◽  
Public Buildings ◽  
Air Conditioning System ◽  
Public Building ◽  
Central Air Conditioning

Large-scale public buildings have high energy density, which take big part of the gross energy consumption in buildings in China. It is still in attempting stage about the strategy of energy conservation in air conditioning systems. The objective of this study is to investigate that how to appropriately divide central air conditioning system zoning by using simulation software to calculate the basis dynamic temperature and load in typical large-scale public buildings. Effects of weather conditions, building envelope conditions and building structure on large-scale public building energy consumption were analyzed in this simulation. The results show that the building load is the fundamental factor involved in air conditioning system zoning. Surplus heat recovery in inner zone is also recommended to maintain inner zone comfort and energy conservation. This work provides the theoretical and technological basis for study on central air conditioning system zoning and thermal comfort for large-scale public building.

Continuous hydrogenolysis of acetal-stabilized lignin in flow

2021 ◽  
Author(s):  
Wu Lan ◽  
Yuan Peng Du ◽  
Songlan Sun ◽  
Jean Behaghel de Bueren ◽  
Florent Héroguel ◽  
...  
Keyword(s):  
Steady State ◽  
Challenges And Opportunities

We performed a steady state high-yielding depolymerization of soluble acetal-stabilized lignin in flow, which offered a window into challenges and opportunities that will be faced when continuously processing this feedstock.

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