Evaluation on the Thermal Conductivity of Sand-Cement Blocks with Kenaf Fiber

2012 ◽  
Vol 626 ◽  
pp. 485-489 ◽  
Author(s):  
Aimi Munirah Jalilluddin ◽  
Seti Mariam Ayop ◽  
Kartini Kamaruddin
Keyword(s):  
Thermal Conductivity ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Hibiscus Cannabinus ◽  
Kenaf Fiber ◽  
Air Conditioning System ◽  
Thermal Insulator ◽  
Conductivity Property ◽  
Masonry Units ◽  
Wall Components

Mechanical means of ventilation and air-conditioning system in Malaysian buildings are used continuously to provide and maintain the comfort of indoor environment to the occupants of the buildings. It was found that the system used led to higher rate of energy consumption. Hence, development of masonry units with high thermal insulation properties is a necessity. This paper represented the study on the thermal conductivity and the density of sand-cement blocks incorporated with different proportions of kenaf (Hibiscus cannabinus L.) fiber as additive. The amount of kenaf fiber inclusions were the main focus to observe the achievement of best results for both properties. It was found that kenaf fiber content had an advantage to reduce the self-weight of blocks whilst reducing the thermal conductivity property. Hence, it can be seen that there is a potential in developing masonry units for single wall components in Malaysian buildings with lightweight features and thermal insulator properties.

Simulation analysis and thermal comfort assessment of indoor environment of the heritage building in gate tower

2020 ◽  
pp. 1420326X2090892
Author(s):  
Qunli Zhang ◽  
Hongbao Zhai ◽  
Xinchao Zhang ◽  
Fang Liu
Keyword(s):  
Thermal Comfort ◽  
Distribution System ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Simulation Analysis ◽  
Heating System ◽  
Air Conditioning System ◽  
Heritage Buildings ◽  
Heritage Building ◽  
Air Control

The thermal comfort inside heritage buildings in China is mostly achieved with the use of split air conditioning and radiator heating system. Due to inefficiencies in the design of those systems, the regulation of air temperature is generally inadequate. To meet the thermal comfort requirements of the partial significant room, which is the meeting hall area, and to preserve the external walls and facade, this paper simulates and analyses typical working conditions of air control schemes in the gate tower and suggests the use of a floor-type fan coil air conditioning system. The results show that the proposed air distribution system can maintain a temperature of 295 K in the summer, which meets the thermal comfort requirements of the meeting hall. This method takes into account the requirement for thermal comfort, as well as the requirements of heritage preservation. Our proposal contributes to the growing literature, which studies methods of improving the thermal comfort of the indoor environment of heritage buildings.

scholarly journals Numerical Evaluation of the Indoor Environment in a Room with Capillary Radiation Air Conditioning System

2016 ◽  
Vol 146 ◽  
pp. 567-572 ◽  
Author(s):  
Linhua Zhang ◽  
Dong Yang ◽  
Yan Zhang ◽  
Qingmei Wen ◽  
Jiying Liu
Keyword(s):  
Air Conditioning ◽  
Indoor Environment ◽  
Numerical Evaluation ◽  
Air Conditioning System

Multiple Criteria Decision Method Used in Selection of Green Air-Conditioning System

2013 ◽  
Vol 732-733 ◽  
pp. 605-608
Author(s):  
Can Zhou ◽  
Yu Yun Li
Keyword(s):  
Heat Pump ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Operating Costs ◽  
Structure Model ◽  
Air Conditioning System ◽  
Ground Source ◽  
Air Conditioning Systems ◽  
Operation And Management ◽  
Selection Of

Established a hierarchy structure model and made a quantitative assessment of seven air-conditioning systems which are gas boiler plus electric refrigerating system、air-cooled heat pump、variable refrigerant volume air conditioning、ground-source heat pump air conditioning、centralized heat-supply plus electric refrigerating、gas direct-fired machine、energy storage on relevant professionality and indoor environment,initial investment,operating costs,operation and management,environmental impact,energy consumption.Finally we obtained an optimal scheme,which agreed with that in practice.

scholarly journals Development of Sustainable Indoor Air Quality for Air-Conditioning System Using Smart Control Techniques

2021 ◽  
Vol 11 (1) ◽  
pp. 1
Author(s):  
Tosin T. Oye ◽  
Naren Gupta ◽  
Keng Goh ◽  
Toyosi K. Oye
Keyword(s):  
Control System ◽  
Health Effects ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Living Conditions ◽  
Technical Solution ◽  
Air Conditioning System ◽  
Control Techniques ◽  
Smart Control ◽  
Co2 Level

Air-conditioning as a technical solution to protect inhabitants from excessive heat exposure creates the challenge of expanding indoor health effects. While air-conditioning has mostly been applied as an improvement to living conditions, health and environmental problems associated with its use frequently occurs. Therefore, this paper challenges and extends existing knowledge on sustainability related to the smart air-conditioning systems. The decrease of CO2 level in building requires an intelligent control system because energy utilisation has been legitimately connected with wellbeing and eventually to operational expenses. A building’s indoor environmental essential factors of comfort are IAQ, visual and thermal. Through an appropriate structured controller, the performance of indoor control system can be altogether improved. It merits creating innovative control techniques to optimise the indoor environment quality for air-conditioning system. The newly proposed backpropagation neural network was optimised using Matlab to control the CO2 level appropriately while carefully taking into account the performance of system controllers such as the stability, adaptability, speed response and overshoot. The controller of indoor environment was designed, and the proportional-integral-derivative control was utilised as a result of its suitability. The smart controllers were designed to regulate the parameters automatically to ensure the optimised control output. The indoor CO2 possesses an appropriate time constant and settling time of 2.1s and 27.3s, respectively. Therefore, utilising smart control techniques to exterminate various indoor health effects is expected to produce sustainable living conditions.

Research on Characteristics of Microbe Spatiotemporal Distribution in Indoor Air

2014 ◽  
Vol 955-959 ◽  
pp. 253-256
Author(s):  
Zhe Hua Du ◽  
Xin Lin
Keyword(s):  
Indoor Air ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Ventilation System ◽  
Weather Condition ◽  
Spatiotemporal Distribution ◽  
Dust Particles ◽  
Airborne Microorganisms ◽  
Air Conditioning System ◽  
Environment Condition

The review focuses on the progresses of air microbes in indoor environment, including their sources, sorts, influence of human body health, spread regulation and spatiotemporal distribution characteristics. Most airborne microorganisms attached to the dust particles, which is present in the air in the form of aerosol .The distribution of microbe is related with indoor environment condition in the air. The factor which influences it to distribute mainly includes temperature, degree of humidity, wind velocity and weather condition etc. Air microbe is bred easily in ventilation and air conditioning system. The growth of microbe has a tremendous relation with the ventilation and air condition. The distribution of microorganisms in different regions, different buildings and different ventilation system is different from each other.

423 Coupled Dynamic Analysis of Air-Conditioning System and Indoor Environment of Air-Conditioned Room

2015 ◽  
Vol 2015.25 (0) ◽  
pp. 205-208
Author(s):  
Tetsuya WAKUI ◽  
Takuma KINOSHITA ◽  
Takahiro HASHIKAWA ◽  
Ryohei YOKOYAMA ◽  
Takashi KANEKO
Keyword(s):  
Dynamic Analysis ◽  
Air Conditioning ◽  
Indoor Environment ◽  
Air Conditioning System ◽  
Coupled Dynamic Analysis
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