scholarly journals Thermal comfort study of plastics manufacturing industry in converting process

2017 ◽  
Vol 26 (3) ◽  
pp. 401-411
Author(s):  
Sugiono Sugiono ◽  
Ryan Fardian ◽  
Oyong Novareza
Keyword(s):  
Fluid Dynamics ◽  
Thermal Comfort ◽  
Air Temperature ◽  
Manufacturing Industry ◽  
Cfd Simulation ◽  
Vote Model ◽  
Building Process ◽  
Clear Glass ◽  
Computational Fluid Dynamics Cfd ◽  
Maximum Air Temperature

Thermal comfort is one of ergonomics factors that can create a significant impact to workers performance. For a better thermal comfort, several environment factors (air temperature, wind speed and relative humidity) should be considered in this research. The object of the study is a building for converting process of plastics manufacturing industry located in Malang, Indonesia. The maximum air temperature inside the building can reach as high as 36°C. The result of this study shows that heat stress is dominantly caused by heat source from machine and wall building. The computational fluid dynamics (CFD) simulation is used to show the air characteristic through inside the building. By using the CFD simulation, some scenarios of solution are successfully presented. Employees thermal comfort was investigated based on predicted mean vote model (PMV) and predicted percentage of dissatisfied model (PPD). Existing condition gives PMV in range from 1.83 to 2.82 and PPD in range from 68.9 to 98%. Meanwhile, modification of ventilation and replacing ceiling material from clear glass into reflective clear glass gave significant impact to reduce PMV into range from 1.63 to 2.18 and PPD into range from 58.2 to 84.2%. In sort, new design converting building process has more comfortable for workers.

CFD Investigation of Air Flow Patterns and Thermal Comfort in a Room with Diverse Heating Systems

2019 ◽  
Vol 6 (2) ◽  
pp. 150-158
Author(s):  
Mohammed Sobhi ◽  
Essam E. Khalil
Keyword(s):  
Thermal Comfort ◽  
Air Temperature ◽  
Cfd Simulation ◽  
Thermal Environment ◽  
Ventilation Rate ◽  
Current Work ◽  
Medium Temperature ◽  
Heating Systems ◽  
Computational Fluid Dynamics Cfd ◽  
Temperature Heating

Objective: The main focus in the current work is to investigate how diverse heating systems and their locations influence the indoor thermal environment in an exhaust- ventilated room. Methods: Four systems for heating the room were used in the current study, in which, heat was transferred by convection and radiation. The four systems were: wall and floor heating at low temperatures, Medium Temperature Radiator (M.T. radiator) heating and High Temperature Radiator (H.T. radiator). Computational Fluid Dynamics (CFD) simulation was used to investigate indoor temperature, vertical air temperature gradient and thermal comfort for each case. The ventilation rate was set to be 6 air changes per hour (ACH) entering the room through a vent over the window. Results: The findings from the current work were that the low temperature heating systems had better temperature distributions with lower vertical Air Temperature Differences compared to high and medium temperature radiator systems. Conclusion: The Predicted Mean Vote (PMV) and the predicted percentage of dissatisfied (PPD) based on Fanger’s model were calculated for all cases, and were found to be in the recommended ranges.

The Impact of Different Types of Permeable Pavement Utilization on Air Temperature above the Pavement

2013 ◽  
Vol 723 ◽  
pp. 678-685 ◽  
Author(s):  
Jyh Dong Lin ◽  
Chen Yu Hsu ◽  
Andika Citraningrum ◽  
Putri Adhitana
Keyword(s):  
Fluid Dynamics ◽  
Air Temperature ◽  
Asphalt Concrete ◽  
Cfd Simulation ◽  
Concrete Block ◽  
Permeable Pavement ◽  
Different Types ◽  
Computational Fluid Dynamics Cfd ◽  
The Impact

This study investigate permeable pavement utilization and its impact on air temperature by using site measurement, statistical analysis, and Computational Fluid Dynamics (CFD) simulation. National Central University (NCU) main library is the case study for the simulations. Simulations on five pavement types (dense grade asphalt concrete/DGAC, permeable asphalt concrete/PAC, concrete, permeable interlocking concrete block/PICB, and grass block) shows that grass block and PICB can reduce air temperature, while three others increase air temperature.

scholarly journals Computational Fluid Dynamics (CFD) Simulation on Mixing in T-Shaped Micromixer

2020 ◽  
Vol 932 ◽  
pp. 012006
Author(s):  
S N A Ahmad Termizi ◽  
C Y Khor ◽  
M A M Nawi ◽  
Nurlela Ahmad ◽  
Muhammad Ikman Ishak ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cfd Simulation ◽  
Computational Fluid Dynamics Cfd

A Study on the Performance of Stratified Air Conditioning Design in Assembly Halls – A Case Study at the Dazhi Cultural Center in Taiwan

2013 ◽  
Vol 368-370 ◽  
pp. 599-602 ◽  
Author(s):  
Ian Hung ◽  
Hsien Te Lin ◽  
Yu Chung Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Indoor Air ◽  
Air Conditioning ◽  
Cfd Simulation ◽  
Indoor Temperature ◽  
Cultural Center ◽  
Computational Fluid Dynamics Cfd

This study focuses on the performance of air conditioning design at the Dazhi Cultural Center and uses a computational fluid dynamics (CFD) simulation to discuss the differences in wind velocity and ambient indoor temperature between all-zone air conditioning design and stratified air conditioning design. The results have strong implications for air conditioning design and can improve the indoor air quality of assembly halls.

Design Approach for the Development of the Flow Field of Bipolar Plates for a PEMFC Stack Prototype

2014 ◽  
Vol 11 (6) ◽  
Author(s):  
Paolo Sala ◽  
Paola Gallo Stampino ◽  
Giovanni Dotelli
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fuel Cell ◽  
Cfd Simulation ◽  
Bipolar Plates ◽  
Flow Rates ◽  
Gas Leakage ◽  
Auxiliary Power ◽  
Computational Fluid Dynamics Cfd ◽  
Enhance Mass

This work is part of a project whose final aim is the realization of an auxiliary power fuel cell generator. It was necessary to design and develop bipolar plates that would be suitable for this application. Bipolar plates have a relevant influence on the final performances of the entire device. A gas leakage or a bad management of the water produced during the reaction could be determinant during operations and would cause the failure of the stack. The development of the bipolar plates was performed in different steps. First, the necessity to make an esteem of the dynamics that happen inside the feeding channels led to perform analytical calculations. The values found were cross-checked performing a computational fluid dynamics (CFD) simulation; finally, it was defined the best pattern for the feeding channels, so that to enhance mass transport and achieve the best velocity profile. The bipolar plates designed were machined and assembled in a laboratory scale two cells prototype stack. Influences of the temperature and of the humidity were evaluated performing experiments at 60 deg and 70 deg and between 60% and 100% of humidity of the reactant gasses. The best operating point achieved in one of these conditions was improved by modifying the flow rates of the reactant, in order to obtain the highest output power, and it evaluated the reliability of the plates in experiments performed for longer times, at fixed voltages.

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