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Open Access 2023 | Open Access | Buch

Attachment Ventilation Theory

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This open access book systematically summarizes the current research progress of attachment ventilation, covering vertical wall attachment, column attachment, and adaptive attachment ventilation. Attachment ventilation is a high-performance ventilation mode that was first proposed by the author, Prof. Angui Li 20 years ago. Now it has been widely used in office spaces, subway stations, high-speed railway stations, international airport terminals, and other large spaces. This book introduces attachment ventilation in detail to eliminate the cooling/heating load of the occupied zone and provide an expected environment for the air-conditioned zone. Attachment ventilation combines the advantages of traditional mixed ventilation and displacement ventilation. This book consists of six chapters, covering a series of airflow patterns, mechanisms, parameter correlations, and attachment ventilation design methods. It is helpful for HVAC engineers to design attachment ventilation effectively.

Inhaltsverzeichnis

Frontmatter

Open Access

Chapter 1. Air Distribution and Indoor Environment Evaluation
Abstract
This book comprises six chapters covering a range of air movement patterns, mechanisms, parameter correlations, and design methods of attachment ventilation, written to help HVAC engineers design and use attachment ventilation described in this book. This chapter introduces the traditional air distribution methods and the indexes to evaluate ventilation performance. The traditionally used ventilation modes comprise mixed and displaced ventilation. The mixed ventilation is based on the dilution principle, supplying a high momentum flow from the ceiling/upper sidewall to the room, while the displaced ventilation is based on the displacement principle, supplying a low momentum flow from the floor/lower wall area to the occupied zone. This chapter briefly presents their pros and cons. Following this, a novel ventilation mode has been proposed, i.e., vertical wall attachment and column attachment ventilation. The ventilation evaluation indexes, such as vertical temperature gradient, effective draft temperature, air diffusion performance index, ventilation efficiency, and thermal stratification height, are presented.
Angui Li

Open Access

Chapter 2. Air Movement and Airflow Patterns of Attachment Ventilation
Abstract
This chapter presents the principle of attachment ventilation (attached ventilation) and airflow patterns. Attachment ventilation is based on the extended Coanda effect, which refers to the phenomenon that the jet flows along the wall surface and attaches to the adjacent walls, maintains continuous flow until it reaches the floor, and continues to adhere to the floor for extending flow to produce air reservoir or air lake. The airflow patterns of vertical wall attachment and column attachment ventilation are fully illustrated and compared by 2D-PIV and trajectory experiments.
Angui Li

Open Access

Chapter 3. Isothermal Attachment Ventilation Mechanisms
Abstract
This chapter expounds on the airflow mechanisms of isothermal vertical wall attachment ventilation, rectangular column attachment ventilation, and circular column attachment ventilation. This chapter presents the characteristic parameters of the isothermal attachment ventilation and the airflow characteristics in the vertical attachment, jet impingement, and horizontal air reservoir regions. The parameter correlations of velocity distribution (maximum velocity or centerline velocity decay and cross-sectional velocity profiles), jet thickness, cross-sectional airflow rate of attachment ventilation, etc., have been established.
Angui Li

Open Access

Chapter 4. Nonisothermal Attachment Ventilation Mechanisms
Abstract
Under nonisothermal conditions, the heated or cooled supply air jet interacts with indoor convection of heat sources, producing a specific temperature field, velocity field, and concentration field. This chapter deals with the airflow mechanisms of nonisothermal attachment ventilation. It discusses the air movement of nonisothermal attached jets, which provides a theoretical basis for the design of the air distribution system for attachment ventilation. The parameter correlations of temperature and velocity distribution of attachment ventilation, etc., are obtained. The influencing factors of human movement and wall roughness elements on the airflow field have also been discussed.
Angui Li

Open Access

Chapter 5. Adaptive Attachment Ventilation with Deflectors
Abstract
This chapter mainly expounds on the principle of adaptive attachment ventilation (AAV), which is beneficial for directionally delivering fresh air or cold/warm air to the breathing zone or occupied zone with a deflector. The appropriate setting of deflectors can effectively improve ventilation efficiency. The deflector forms and installation height are analyzed, which directly influences ventilation effectiveness. In contemporary architectural engineering, especially in some symbolic modern architectural styles, the wall structure often adopts circular arc, elliptical and inclined wall forms. Hence, curved surface attachment ventilation is proposed, and its airflow patterns are discussed. Moreover, the attachment ventilation modes applied to some particular spaces, such as the concave corner attachment ventilation, are briefly introduced.
Angui Li

Open Access

Chapter 6. Design Methods of Attachment Ventilation Systems
Abstract
This chapter expounds on a fundamental design principle, design methods, and case studies for attachment ventilation. The design flow charts are provided that describe the primary considerations required and detailed procedures when designing wall-attached air distribution for rooms (spaces) heating or cooling. A comparison of attachment, mixing, and displacement ventilation design methods are also presented. Lastly, the step-by-step design procedures of attachment ventilation systems for typical application scenarios are demonstrated, such as office buildings, exhibition halls, subway stations, and waiting halls of high-speed railway stations.
Angui Li
Metadaten
Titel
Attachment Ventilation Theory
verfasst von
Angui Li
Copyright-Jahr
2023
Verlag
Springer Nature Singapore
Electronic ISBN
978-981-19-9259-9
Print ISBN
978-981-19-9258-2
DOI
https://doi.org/10.1007/978-981-19-9259-9