scholarly journals Hybrid Ventilation in an Air-Conditioned Office Building with a Multistory Atrium for Thermal Comfort: A Practical Case Study

Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 625
Author(s):  
Hao-Hsiang Hsu ◽  
Wei-Hwa Chiang ◽  
Jian-Sheng Huang
Keyword(s):  
Thermal Comfort ◽  
Public Space ◽  
Office Building ◽  
Practical Case ◽  
Displacement Ventilation ◽  
Cold Air ◽  
The Public ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Stack Ventilation

This study involved a series of computational fluid dynamics simulations to evaluate the effectiveness of stack and displacement ventilation in providing better thermal comfort in an air-conditioned office building. To reduce energy consumption, the public area of the studied building is cooled by air from air-conditioned rooms with lower temperatures. The air, which is driven by buoyancy, then, flows outside through the multistory atrium. The simulation results indicated that displacement ventilation provides superior thermal comfort performance relative to stack ventilation. A design with a higher ceiling, a higher heat source and a lower inlet with cold air can substantially enhance the efficiency of displacement ventilation. Furthermore, handrails near the atrium play a crucial role because they help to retain cold air in the public space for a longer period, thereby contributing to a better predicted mean vote value.

Optimal Minimum Airflow for Air Circulation of Single-Duct VAV Terminal Boxes

2008 ◽  
Author(s):  
Young-Hum Cho ◽  
Mingsheng Liu
Keyword(s):  
Thermal Comfort ◽  
Air Temperature ◽  
Thermal Discomfort ◽  
Variable Air Volume ◽  
Air Handling Unit ◽  
Optimal Value ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Air Circulation ◽  
The Impact

Thermal comfort in an area is directly controlled by terminal boxes in variable air volume (VAV) air-handling unit (AHU) systems. The terminal box either modulates airflow or adjusts the discharge air temperature. Reduced air circulation will cause thermal discomfort in a conditioned space if the airflow and discharge air temperature are not suitable. The objective of this study is to identify an optimal value for airflow and discharge air temperature that will maintain room thermal comfort. Optimal room airflow and discharge air temperature is analyzed, and the impact of room airflow and discharge air temperature on thermal stratification is verified through CFD (Computational Fluid Dynamics) simulations.

A comparison of the thermal comfort performances of a radiation floor cooling system when combined with a range of ventilation systems

2019 ◽  
Vol 29 (4) ◽  
pp. 527-542 ◽  
Author(s):  
Jiying Liu ◽  
Zhuangzhuang Li ◽  
Moon Keun Kim ◽  
Shengwei Zhu ◽  
Linhua Zhang ◽  
...  
Keyword(s):  
Thermal Comfort ◽  
Cooling System ◽  
Whole Body ◽  
Equivalent Temperature ◽  
Thermal Discomfort ◽  
Computational Fluid Dynamics Simulations ◽  
Radiant Floor Cooling System ◽  
Personalized Ventilation ◽  
Dynamics Simulations ◽  
Ventilation Systems

This study conducted a series of computational fluid dynamics simulations to evaluate the thermal comfort performance of a radiant floor cooling system when combined with different ventilation systems, including mixed ventilation (MV), stratum ventilation (SV), displacement ventilation (DV) and ductless personalized ventilation (DPV). A window temperature of 32°C and three different floor temperatures including 20, 22 and 24°C were set in summer. We used the vertical air temperature differences (VATD) at ankle and head level, the percentage of dissatisfied, the draught rate at the ankle level and the equivalent temperature as our main evaluation indices. Our results show that the VATD in DV system can reach up to about 5°C, compared with about 2°C in MV and SV systems. For the DPV system, there is only a marginal drop in the VATD. For the DV and DPV cases, with a rate of air changes per hour (ACH) of 2.4−1, we recorded a higher draught rate at the ankle level, ranging from 6.55% to 9.99%. The lower equivalent temperature values for the foot and calf segments occur when the floor temperature is 20°C. In all cases, the equivalent temperature values of the whole body indicate an acceptable level of thermal discomfort.

Habermas, Cultural Hegemony, and the Educational Public Sphere

2018 ◽  
Vol 11 (1-2) ◽  
pp. 43-62
Author(s):  
Wisam Kh. Abdul-Jabbar
Keyword(s):  
Public Sphere ◽  
Social Inequality ◽  
Public Space ◽  
Oral Tradition ◽  
Pedagogical Practices ◽  
Cultural Hegemony ◽  
The Public ◽  
The Public Sphere ◽  
Arabic Speaking

This study explores Habermas’s work in terms of the relevance of his theory of the public sphere to the politics and poetics of the Arab oral tradition and its pedagogical practices. In what ways and forms does Arab heritage inform a public sphere of resistance or dissent? How does Habermas’s notion of the public space help or hinder a better understanding of the Arab oral tradition within the sociopolitical and educational landscape of the Arabic-speaking world? This study also explores the pedagogical implications of teaching Arab orality within the context of the public sphere as a contested site that informs a mode of resistance against social inequality and sociopolitical exclusions.

Public space of the trustworthiness of sociological knowledge: The case of electoral research

2020 ◽  
pp. 13-22
Author(s):  
OLEKSANDR STEGNII
Keyword(s):  
Public Space ◽  
Research Process ◽  
Negative Influence ◽  
Election Campaign ◽  
Sociological Research ◽  
Good Tool ◽  
Sociological Knowledge ◽  
The Public ◽  
Approval Ratings ◽  
The Impact

The paper analyses specific features of sociological data circulation in a public space during an election campaign. The basic components of this kind of space with regard to sociological research are political actors (who put themselves up for the election), voters and agents. The latter refer to professional groups whose corporate interests are directly related to the impact on the election process. Sociologists can also be seen as agents of the electoral process when experts in the field of electoral sociology are becoming intermingled with manipulators without a proper professional background and publications in this field. In a public space where an electoral race is unfolding, empirical sociological research becomes the main form of obtaining sociological knowledge, and it is primarily conducted to measure approval ratings. Electoral research serves as an example of combining the theoretical and empirical components of sociological knowledge, as well as its professional and public dimensions. Provided that sociologists meet all the professional requirements, electoral research can be used as a good tool for evaluating the trustworthiness of results reflecting the people’s expression of will. Being producers of sociological knowledge, sociologists act in two different capacities during an election campaign: as analysts and as pollsters. Therefore, it is essential that the duties and areas of responsibility for professional sociologists should be separated from those of pollsters. Another thing that needs to be noted is the negative influence that political strategists exert on the trustworthiness of survey findings which are going to be released to the public. Using the case of approval ratings as an illustration, the author analyses the most common techniques aimed at misrepresenting and distorting sociological data in the public space. Particular attention is given to the markers that can detect bogus polling companies, systemic violations during the research process and data falsification.

The public and the private: reconfiguring the interrelationship during a civil act

2019 ◽  
pp. 53-69
Author(s):  
Natalia Kostenko
Keyword(s):  
Public Sphere ◽  
Public Space ◽  
Rapid Development ◽  
Online Communication ◽  
Decisive Role ◽  
Physical Interaction ◽  
Bare Life ◽  
Public And Private ◽  
The Public ◽  
The Public Sphere

The subject matter of research interest here is the movement of sociological reflection concerning the interplay of public and private realms in social, political and individual life. The focus is on the boundary constructs embodying publicity, which are, first of all, classical models of the space of appearance for free citizens of the polis (H. Arendt) and the public sphere organised by communicative rationality (Ju. Habermas). Alternative patterns are present in modern ideas pertaining to the significance of biological component in public space in the context of biopolitics (M. Foucault), “inclusive exclusion of bare life” (G. Agamben), as well as performativity of corporeal and linguistic experience related to the right to participate in civil acts such as popular assembly (J. Butler), where the established distinctions between the public and the private are levelled, and the interrelationship of these two realms becomes reconfigured. Once the new media have come into play, both the structure and nature of the public sphere becomes modified. What assumes a decisive role is people’s physical interaction with online communication gadgets, which instantly connect information networks along various trajectories. However, the rapid development of information technology produces particular risks related to the control of communications industry, leaving both public and private realms unprotected and deforming them. This also urges us to rethink the issue of congruence of the two ideas such as transparency of societies and security.

Conclusion

2018 ◽  
Author(s):  
Samuel Llano
Keyword(s):  
Public Health ◽  
Public Space ◽  
Social Conflict ◽  
Musical Performance ◽  
The Public ◽  
Political Interests ◽  
Musical Practices ◽  
The Media ◽  
The City

As is described in this conclusion, more than the media and culture, Madrid’s public space constituted the primary arena where reactions and attitudes toward social conflict and inequalities were negotiated. Social conflict in the public space found expression through musical performance, as well as through the rise of noise that came with the expansion and modernization of the city. Through their impact on public health and morality, noise and unwelcomed musical practices contributed to the refinement of Madrid’s city code and the modernization of society. The interference of vested political interests, however, made the refining of legislation in these areas particularly difficult. Analysis of three musical practices, namely, flamenco, organilleros, and workhouse bands, has shown how difficult it was to adopt consistent policies and approaches to tackling the forms of social conflict that were associated with musical performance.

Conquering the Public Space

2018 ◽  
Author(s):  
Samuel Llano
Keyword(s):  
Public Space ◽  
Social Services ◽  
Social Groups ◽  
Public Image ◽  
Working Classes ◽  
The Public ◽  
San Bernardino ◽  
The City

This chapter presents an account of the San Bernardino band as the public facade of that workhouse. The image of children who had been picked up from the streets, disciplined, and taught to play an instrument as they marched across the city in uniform helped broadcast the message that the municipal institutions of social aid were contributing to the regeneration of society. This image contrasted with the regime of discipline and punishment inside the workhouse and thus helped to legitimize the workhouse’s public image. The privatization of social aid from the 1850s meant that the San Bernardino band engaged with a growing range of institutions and social groups and carried out an equally broad range of social services. It was thus able to serve as the extension through which Madrid’s authorities could gain greater intimacy with certain population sectors, particularly with the working classes.

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