Papers by Keyword: Thermal Comfort

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Authors: Chih Chun Su, Sai Chih Pan, Shih Feng Lin
Abstract: A traditional metal processing factory is a hot workplace. Previously, the rationality of the work-rest time regimen and the hazard of workload on employee health have been evaluated; however, thermal comfort of workers in such a hot workplace has not been discussed. This paper uses the standard new effective temperature as the thermal environment index to investigate the neutral temperature, preferred temperature, and comfortable temperature range. The doors and windows in traditional metal processing factories are always open; therefore, the neutral temperature is almost the same as the neutral temperature in semi-outdoor and outdoor environments. In addition, the preferred temperature is slightly higher than the neutral temperature. We also discovered that the comfortable temperature range in traditional metal processing factories is larger than that in office environments, but smaller than that in semi-outdoor and outdoor environments.
Authors: Tao Chen, Mu Sheng Huang, Kai Song
Abstract: This article mainly puts forward a new type of criteria named ACS-DR that can rapidly to have an evaluation of compartment thermal comfort, which is based on the research of the international indoor air thermal comfort evaluation criteria of buildings. Using the common advanced fluid software STAR CCM+ to have a comparative study between the ACS-DR criterion and the PMV-PPD criterion, for the PMV-PPD criterion is widely used in the vehicle. The result of this study shows that ACS-DR criterion can be good meet with minibus cabin thermal environment comfort evaluation requirement, moreover, the ACS-DR criterion is more convenient and quick than the PMV-PPD criterion in the same condition environment. This can provide an advantage for engineers, while engaging in automobile development.
Authors: Yosica Mariana, Religiana Hendarti, Miladini Prastiwi
Abstract: This paper presents a study of thermal comfort of container for a low income flat in Jakarta. This study was conducted since the population of Jakarta is rapidly growing so that the provision of houses for inhabitants especially for low-income communities is necessary. One solution to resolve this issue is vertical housing that concern the sustainability development process; hence, the use of used container may become a suitable choice. However, the drawback of the container is made of aluminum which has high thermal conductivity and can cause poor indoor thermal comfort. This study, therefore, analysed a used container to investigate its indoor thermal comfort. In order to facilitate that objective, a simulation study was conducted. The simulation study consisted of two steps: (1) to simulate the indoor thermal comfort of the container without insulation and (2) to simulate the container after has been added by insulator materials and air gap between the materials. The results showed that by adding insulator materials and air gap as the second layer, the indoor thermal comfort can be improved up to 26%. This result is in the range of the third level of Standard National Indonesia (SNI) thermal comfort version.
Authors: Soen Han Lee, Bin Feng Yan, Chen Yi Sun, Wen Wen Chou, Jing Zhe Lin
Abstract: This study examined “EEWH-HI” standards of shade in Tainan, and used rain and the sun as indicators to verify The Plan of Good Looking Corner to improve urban thermal comfort levels on the roads. The Plan of Good Looking Corner in Tainan was ran by the Tainan City Government for schools, offices, green spaces, squares, communities, and other public spaces, to create corners of green in order to beautify and improve the overall urban landscape. This study selected 173 locations to conduct assessments for shade indicators from the rain and sun. Statistical analysis, ANOVA, Regression Analysis, and the Correlation Coefficient method were applied to clarify the impact factor effects of urban shade and thermal comfort to prepare final recommendations.
Authors: Jion Sean Pau, William K.S. Pao
Abstract: Thermal comfort, which used to be a luxury in life has transformed into a necessity in modern lives. Tropical country such as Malaysia has hot and humid climate all year round. Much air conditioning is required in tropical countries to provide thermal comfort for indoor occupants. Fangers model is deterministic as it regards the heat fluxes across the boundary between humans and their thermal environment. Fangers model is adopted by ASRHAE Standard 55 in 1992 but it has over-predicted thermal preferences of those living in tropics. Malaysians who are used to hot and humid climates prefer warmer indoor temperature, as hypothesized in adaptive model. Adaptive model is said to predict thermal comfort more accurately than Fangers model as it relates the indoor comfortable temperature to outdoor air temperature. The objective of this research is to integrate the adaptive theories into Fangers model and to synthesize a new thermal comfort model which is expected to accurately predict thermal comfort in tropical countries. As the adaptive theory says that not all peoples thermal preferences are affected by thermal histories and contextual factors, the new model has proposed a broader operation range of PMV for air conditioner. The increment of PMV range from ±1.0 to ±1.17 for 80% satisfaction requirement is proved to applicable in Malaysia.
Authors: Salvatore Carlucci, Paolo Zangheri, Lorenzo Pagliano
Abstract: The recast of the European Directive on Energy Performance of Buildings introduces the concept of nearly Zero Energy Building. To obtain a practical interpretation of this building concept, it is necessary to clarify two main issues: (i) how it is possible to select a reliable and agreed upon concept of “zero energy”; (ii) which technological features might be used to reach that target. In order to test the design of a nearly Zero Energy Building in the South of Europe, we present as case study an Italian Passivhaus located in the Po Valley that has been monitored for 18 months and analyzed through dynamic simulations of calibrated models. In this paper we present a selection of the result of the monitoring and simulation phases regarding the contribution (in terms of reduction of the indoor operative temperatures) of Earth-to-Air Heat Exchangers and natural ventilation strategies to meet different summer thermal comfort targets and consequently to avoid the installation of an active cooling system.
Authors: Rui Liang Yang, Zi Long Xu
Abstract: To investigate the actual thermal condition in Chinese textile workshop, thermal comfort vote (TCV), actual mean vote (AMV) and thermal acceptability (TA) were carried out in this paper. 41 workers with years of work experience and 23 students with rarely entering into workshop were chosen as the subjects. Though 61% workers and 74% students feel warm or hot in the textile workshop, 24 % workers and 39% students feel very uncomfortable warm or extremely comfortable in the textile workshop, while 100% workers and 96% students were not very resistant to the thermal environment of the textile workshop. Ideally the AMV value should equal to TCV value, in fact only half of the subjects to meet this rule. On average, the TCV value is lower than the AMV value up to 0.6 scale point. Compared to students with rarely entering into the workshop, workers can adapt more easily to the hot and humid environment of the textile workshop.
Authors: Siew Chong Chan
Abstract: Since global environmental issues are widely discussed nowadays, a number of studies are being carried out to resolve the challenges of reducing energy usage in buildings, especially related to energy use to sustain the indoor thermal comfort level. Among the methodologies used, Analytical Hierarchy Process (AHP) is commonly used to study the problems with multiple influencing factors which consist of different degree of implications. In this study, this model is used to investigate the effectiveness and consistency of respondents’ feedback onto the utility of passive design features in office buildings in order to sustain the indoor thermal comfort levels besides depending on artificial cooling equipment. A number of 122 academic staff from 5 units of primary schools within urban areas in Seremban District was involved in the study. All the schools were equipped with passive design elements, but different types of mechanical ventilation systems were installed in particular schools. Questionnaires with Likert scales were distributed to assist the respondents rank their subjective opinions with objective numerical values. The outputs of rankings generated through AHP by the respondents in different schools were studied, and their validities were further analyzed with ANOVA tests to justify the consistency of the findings. The results showed that there is not much significant difference among the evaluated batches, and thus, model is potential to be further developed into a more comprehensive evaluation tool to link with unidentified environmental and physical factors which generate important design data for future building designers.
Authors: Jun Wang, Hai Xia Wang
Abstract: Simulation with CFD and local test are two main methods in study on air flow in large space building. This paper tests and simulates thermal comfort and air distribution of existing air- conditioning mode of some exhibition center. Through comparison and analysis on existing and simulated air-conditioning pattern, draw a conclusion that it’s feasible to simulate thermal comfort and air distribution of air-conditioning. And the research is important to guide energy efficiency and design optimization of air-conditioning system in large space building.
Authors: Odim O. Odim
Abstract: Thermal comfort problems experienced in buildings in warm humid climates has been a major concern for designers in the environmental design specialty especially in Nigeria and other developing countries. This paper through controlled experiments studies the effect of window shading on indoor comfort levels of buildings exposed to warm humid climates. Experimental model buildings with shaded and non-shaded windows were constructed for this purpose. Comfort data were obtained from the buildings and meteorological stations including comfort parametric ranges. The data were analyzed with statistical tools involving the central tendency and dispersion. Hypotheses were tested. Results showed that window shading has significant effect on the comfort level of buildings and consequently energy usage.
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