scholarly journals Experimental Research on the Correlation of Temperature, Humidity, and CO2 Level of a Rice Hull Insulated Indoor Environment

2013 ◽  
Vol 12 (2) ◽  
pp. 221-228 ◽  
Author(s):  
Kyu-In Lee ◽  
Dongwoo Yeom ◽  
Eun-Jin Kim
Keyword(s):  
Experimental Research ◽  
Indoor Environment ◽  
Rice Hull ◽  
Co2 Level

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.

Study on the indoor environmental performance of complex insulation material: Carbonized rice hull and glass wool

2016 ◽  
Vol 27 (1) ◽  
pp. 109-120 ◽  
Author(s):  
Cheng-Ri Yin ◽  
Dongwoo Yeom ◽  
Kyu-In Lee
Keyword(s):  
Indoor Environment ◽  
Environmental Control ◽  
Glass Wool ◽  
Rice Hull ◽  
Insulation Material ◽  
Control Performance ◽  
The Difference ◽  
The Stability ◽  
Insulation Wall ◽  
Indoor Humidity

The purpose of this study is to make a complex insulation material with carbonized rice hull and glass wool and to verify the environmental control performance. Full-scale experimental mock-ups were constructed, and the control performance in an indoor environment was compared and verified through monitoring experiments. The complex insulation mock-up showed a relatively high temperature during spring, summer and autumn. The difference in the heat storage capacity of the materials was the cause for this difference. Also, the complex insulation material was proven as more effective at maintaining the stability of the indoor environment and temperature during spring, summer and autumn. In addition, the complex insulation was able to control the indoor humidity at a comfortable level during every season. Our results have therefore verified that the carbonized rice hull was effective at controlling the indoor humidity. When compared with the pure carbonized rice hull insulation, the complex insulation wall was relatively thin; therefore, more net indoor area could be achieved by using the complex insulation material. In addition, if self-produced, the complex insulation could be economically more feasible. Therefore, this complex material was synthetically proven to have merits for insulation of lightweight timber houses for thermal comfort of occupants.

Indoor Environment Health and Safety Status in Industrial Sectors of Bangladesh: a Case Study on Industries under Kumudini Welfare Trust

2018 ◽  
Vol 10 (2) ◽  
pp. 65-72
Author(s):  
MMM Hoque ◽  
PK Banik
Keyword(s):  
Relative Humidity ◽  
Natural Resources ◽  
Indoor Environment ◽  
Oxygen Deficiency ◽  
Health And Safety ◽  
Indoor Temperature ◽  
Industrial Sectors ◽  
Co2 Level ◽  
C 32

This study was conducted to know the indoor environment, health and safety status towards the workers of different industries situated in Narayanganj under Kumudini Welfare Trust (KWT) of Bangladesh. The data were collected during the monthof March-April, 2016. Measurednoise level in different industries under KWT ranged from 71-90.5 dB. During the study, among all of the four industries highest level of noise was measured in Kumudini Jute Bailing and Warehouse Ltd. (90.5 dB) followed by Kumudini Garments Ltd. (78 dB). Indoor temperature in different industries under KWT ranged from 26.5°C-32°C. Highest level of temperature was measured in Kumudini Garments Ltd. (32°C) followed by Kumudini Handicraft Ltd. (30.5°C), Kumudini Pharma Ltd. (29.5°C) and Kumudini Jute Bailing and Warehouse Ltd. (26.5°C). During the observations, highest relative humidity was measured in Kumudini Garments Ltd. (19.5%) followed by Kumudini Pharma Ltd. (5.2%), Kumudini Handicraft Ltd. (2%) and Kumudini Jute Bailing and Warehouse Ltd. (1.2%). In this study, observed level of CO2 in the indoor environment of the study area ranged from - 0.2 to 0.45 %. All of the measured CO2 level is greater than standard concentration of 0.03%, except Kumudni Jute Bailing and Ware House. Based on our present clarifications there was no oxygen deficiency in the door environment of the industries under KWT.J. Environ. Sci. & Natural Resources, 10(2): 65-72 2017

Secondary Transfer Effect of Contact

2009 ◽  
Vol 40 (2) ◽  
pp. 55-65 ◽  
Author(s):  
Thomas F. Pettigrew
Keyword(s):  
Cognitive Dissonance ◽  
Experimental Research ◽  
Intergroup Contact ◽  
Transfer Effect ◽  
Evaluative Conditioning ◽  
Transfer Effects ◽  
Secondary Transfer ◽  
Primary Reduction

This paper reviews the evidence for a secondary transfer effect of intergroup contact. Following a contact’s typical primary reduction in prejudice toward the outgroup involved in the contact, this effect involves a further, secondary reduction in prejudice toward noninvolved outgroups. Employing longitudinal German probability samples, we found that significant secondary transfer effects of intergroup contact exist, but they were limited to specific outgroups that are similar to the contacted outgroup in perceived stereotypes, status or stigma. Since the contact-prejudice link is bidirectional, the effect is inflated when prior prejudice reducing contact is not controlled. The strongest evidence derives from experimental research. Both cognitive (dissonance) and affective (evaluative conditioning) explanations for the effect are offered.

Review of Foundations of Experimental Research. 3rd ed.

1983 ◽  
Vol 28 (10) ◽  
pp. 805-805
Author(s):  
Roger E. Kirk
Keyword(s):  
Experimental Research
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