Energy and economic analysis of model-based air dampers strategies on a VAV system

Kialashaki, Yaser

doi:10.1007/s13762-018-1863-z

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Modified and improved designs for various components in HVAC systems, such as dampers dampers [ 25 , 26 ], filters [ 27 , 28 ], humidifier, dehumidifier [ 29 , 30 ], heating and cooling coils [ 31 ], and ducts and fans [ 27 , 32 ], can reduce the energy consumption of such systems while optimizing their performance [ 13 ].…”

Section: Energymentioning

confidence: 99%

Sustainability of Heating, Ventilation and Air-Conditioning (HVAC) Systems in Buildings—An Overview

Asim

Badiei

Mohammad

et al. 2022

IJERPH

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Increasing demand on heating, ventilation, and air-conditioning (HVAC) systems and their importance, as the respiratory system of buildings, in developing and spreading various microbial contaminations and diseases with their huge global energy consumption share have forced researchers, industries, and policymakers to focus on improving the sustainability of HVAC systems. Understanding and considering various parameters related to the sustainability of new and existing HVAC systems as the respiratory system of buildings are vital to providing healthy, energy-efficient, and economical options for various building types. However, the greatest opportunities for improving the sustainability of HVAC systems exist at the design stage of new facilities and the retrofitting of existing equipment. Considering the high available percentage of existing HVAC systems globally reveals the importance of their retrofitting. The attempt has been made to gather all important parameters that affect decision-making to select the optimum HVAC system development considerations among the various opportunities that are available for sustainability improvement.

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Section: Energymentioning

confidence: 99%

Sustainability of Heating, Ventilation and Air-Conditioning (HVAC) Systems in Buildings—An Overview

Asim

Badiei

Mohammad

et al. 2022

IJERPH

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show abstract

“…5 In China, VAV systems are primarily used in high-rise buildings and large public buildings; nevertheless, they have broad application potential: the larger the building, the higher the energy saving potential of VAV systems compared to fan coil or constant air volume (CAV) systems, and the shorter the investment payback period. 6,7 As the air ducts of VAV systems are interconnected, contaminant propagation is an important consideration in system design and implementation. 8 According to the ASHRAE standard 62.1 section 6.2, the fresh air volume of VAV systems must satisfy certain requirements for personnel hygiene and contaminant dilution.…”

Section: Introductionmentioning

confidence: 99%

Optimal control of critical fresh air volume based on sectional adjustment of fresh air and return air dampers

Zhao

Xing

et al. 2023

Building Services Engineering Research and Technology

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During the regulation process of VAV systems, the supply air volume changes with the real time load changes, which will cause the fresh air volume to deviate from its set value. Insufficient fresh air results in poor IAQ, whereas an excessive fresh air increases energy consumption. Therefore, an effective method to control the fresh air volume is essential for VAV systems. Based on the differential pressure control theory, two improved control methods—the fresh air section static pressure control method and the critical air volume control method—are proposed herein. Three control methods were compared through experimental study. The results indicate that differential pressure in the first improved method is higher than that in the differential pressure control method, which increases the ease of measurement. However, both these methods have approximately 15% to 25% errors when the supply air volume is small. The critical air volume control method provides more precise control of the fresh air volume, and eliminates deviations at small supply air volumes. Furthermore, the fan power is reduced as well. Investigation has demonstrated that the critical air volume control method is energy-efficient, and can provide new insights into optimized energy-saving control methods for VAV systems. This work proposed a fresh air volume control method of VAV system, the critical air volume control method. This method improves the control accuracy and the convenience of differential pressure measurement of VAV system. The reliability of the method was verified on the test rig, and it is similar to the engineering situation. Therefore, this method has practical application value. Also this method reduces the fan energy consumption of VAV system, thereby improving energy efficiency and reducing operating costs.

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“…HVAC accounts for a 30%∼60% of the total building energy consumption. 1,2 Reducing the energy consumption of air conditioning system has become an important part of building carbon reduction. 3 Variable air volume air conditioning (VAV) is a system developed to achieve energy-saving operation by reducing the energy consumption of the fan when the indoor load decreases.…”

Section: Introductionmentioning

confidence: 99%

An active diffuser control method based on the constant jet throw for improving airflow distribution in variable air volume systems

Song

Zhang

et al. 2023

Indoor and Built Environment

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The air supply of the variable air volume (VAV) system could decrease with indoor load, resulting in reduced indoor comfort. An active diffuser is a good solution, but its adjustment process is often neglected. In most cases, the diffuser maintains the air supply velocity constant by controlling the air supply area. This traditional control method based on constant velocity (CMV) often fails to reach jet throw expectation due to the continuous change of airflow diffusion performance during the adjustment process. In this study, a new control method based on constant jet throw length (CMT) is proposed and applied in two typical rooms (office and conference). The results show that the CMT could increase the throw length in the spreading zone and enhances the airflow at the wall zone and ground zone, providing a more uniform temperature and more comfortable indoor environment. In 40% air volume condition, the air diffusion performance index (ADPI) in the office using CMT has improved from 89.66% to 95.69% compared to CMV, while ADPI in the conference improved from 92.11% to 97.37%. This study can help designers determine the optimal adjustment scheme to improve the adaptability of the active diffuser to the VAV system.

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Energy and economic analysis of model-based air dampers strategies on a VAV system

Cited by 7 publications

References 29 publications

Sustainability of Heating, Ventilation and Air-Conditioning (HVAC) Systems in Buildings—An Overview

Sustainability of Heating, Ventilation and Air-Conditioning (HVAC) Systems in Buildings—An Overview

Optimal control of critical fresh air volume based on sectional adjustment of fresh air and return air dampers

An active diffuser control method based on the constant jet throw for improving airflow distribution in variable air volume systems

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