Research on optimization and design methods for air distribution system based on target values
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Research on optimization and design methods for air distribution system based on target values
1. School of Building Services Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2. School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China 3. China Railway First Survey & Design Institute Group, Xi’an 710043, China
Abstract
Keywords
To achieve sufficient air conditioning of large buildings, reasonable air distribution in indoor spaces is an effective method for creating stratified air conditioning. Therefore, optimizing the air distribution in large buildings is extremely significant. In this paper, we expound on a new method for air distribution design and optimization based on target value evaluation and summarize the relevant design processes based on an orthogonal test and by decoupling the effects of the size of the tuyère, airflow temperature, air-supply angle and velocity on air distribution. Then, we present a design case. To optimize the distribution of a lateral air supply in winter, the deflection angle, velocity and temperature of the air supply can be determined in turn. For the large and tall building types addressed in this paper, the optimal air-supply angle is 2°, the optimal air-supply velocity is 8 m/s, and the optimal air-supply temperature is 19 °C.
air distribution,
Research Article
Ran Gao1,2 (), Hengchun Zhang1, Angui Li1,2, Shihao Wen1, Wuyi Du3, Baoshun Deng3
target value, indicator optimization
Article History Received: 21 February 2020 Revised: 07 June 2020 Accepted: 17 June 2020 © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020
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Introduction
E-mail: [email protected]
Indoor/Outdoor Airflow and Air Quality
As the last (but key) link of an air-supply terminal such as a ventilating air conditioner, the effect of air distribution on the human body directly determines the operating efficiency of the ventilation and air conditioning system (Sundell 2004). The existing design of air distribution was first proposed in the 1980s—half a century ago—and can be further optimized today (Nielsen 2004). In terms of energy conservation and emission reduction, compared with ventilation and air conditioning units, air distribution optimization can significantly improve system operating efficiency. For example, at present, a 10% efficiency improvement for a refrigeration compressor is considered significant; however, the possible efficiency improvements to air distribution ventilation and energy utilization coefficients can easily exceed 50% (Takleh and Zare 2019; Cheng et al. 2019). Therefore, from an energy viewpoint, the most effective way to improve the efficiency of ventilation and air conditioning systems is to optimize their air distribution. In addition, indoor thermal comfort and air quality also depend on indoor air distribution (Li
and O’Neill 2018). Poor air distribution is a major cause of asthma, tumors and cardiovascular diseases (Guo et al. 2018). Therefore, i
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