Survey of Control Characteristics of Circular Air Dampers in Variable Air Volume Ventilation Systems

Millers, Renārs; Pelīte, Uldis

doi:10.1016/j.egypro.2016.09.152

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Each wall consists of two layers of 120 mm concrete and 30 mm insulation, and each window consists of two layers (double pane) of 6 mm clear glass. Assuming that the flow rate of air is linearly proportional as in known through several physical experiments, the opening ratio of the damper is directly utilized as the amount of supply air [27]. The conduction of envelopes and fenestrations is one of the major factors for the calculation of the heat loss, but the latent heat from people, lighting, equipment, and machine is not included for the heat gain.…”

Section: Design Strategymentioning

confidence: 99%

Comparative Analysis of Energy Use and Human Comfort by an Intelligent Control Model at the Change of Season

Yoon

Ahn

2020

Energies

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For improving control methods in the thermal environment, various algorithms have been studied to satisfy the specific conditions required by the characteristics of building spaces and to reduce the energy consumed in operation. In this research, a network-based learning control equipped with an adaptive controller is proposed to investigate the control performance for supply air conditions with maintaining the levels of indoor thermal comfort. In order to examine its performance, the proposed model is compared to two different models in terms of the patterns of heating and cooling energy use and the characteristics of operational signals and overshoots. As a result, the energy efficiency of the proposed control has been slightly decreased due to the energy consumption increased by precise controls, but the thermal comfort has improved by about 10.7% more than a conventional thermostat and by about 19.8% more than a deterministic control, respectively. This result can contribute to the reduction of actual installation and maintenance costs by reducing the operating time of dampers and the energy use of heating coils without compromising indoor thermal comfort.

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Section: Design Strategymentioning

confidence: 99%

Comparative Analysis of Energy Use and Human Comfort by an Intelligent Control Model at the Change of Season

Yoon

Ahn

2020

Energies

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“…But still, in Malaysia, 24°C to 25°C is the comfortable temperature range for Malaysian due to neither being too cool nor too hot climate conditions as explained by Ahmad et al, [16] and Ismail et al, [17]. [18] In the HVAC study, Millers et al, [18] had proposed the iris diaphragm as a circular air damper in VAV ventilation systems. They focused on comparing and measuring the control curves and characteristics of multiple damper designs, such as the single blade damper with high and low leakage, damper with iris type diaphragm and conical diaphragm damper, as shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

The Comparison of P, PI and PID Strategy Performance as Temperature Controller in Active Iris Damper for Centralized Air Conditioning System

Busu

Isa²,

Hariri³

et al. 2023

ARFMTS

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The topic of maintaining thermal comfort efficiency in the heating, ventilation and air conditioning (HVAC) sector has always been tricky due to numerous challenges. The study focused on the challenge of under-actuated zones in non – residential and commercial buildings. The active iris damper with the integration of thermal controller is proposed to control the indoor temperature. Besides, integration of PID control strategy will be a tempting control system in enhancing the thermal performance of the building. Again, the PID controller has proven good compatibility as a primary closed-loop mechanism to maintain a comfortable room temperature. The development of the control system is done through the Arduino platform with LabVIEW as the front panel and data logging platform. The Heuristic tuning method was employed to obtain optimal gains for P, PI and PID controllers. The performance of each controller was tested by observing their ability to maintain steadily at the desired temperature set point. These tests conveyed that the best controller for this application is the PID controller. It reached the desired temperature set point and maintained it even with a temperature disruption. This study indicates that an active iris damper can effectively maintain the thermal comfort performance of indoor environment with the implementation of PID strategy, thus remedying some of the problems faced by centralized air-conditioning systems.

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“…Focusing on improving the VAV ventilation system, Millers et al, [13] studied the characteristic of circular air dampers between single blade, iris and conical diaphragm type dampers. He suggested that iris type damper is the most suitable for VAV damper, but more research on precise measurement and control characteristics needs to be done.…”

Section: Introductionmentioning

confidence: 99%

Air Damper Effect on Temperature and Airflow Distribution in Enhancing Thermal Comfort Performance

Busu

Isa

Hariri

et al. 2022

ARFMTS

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Heating, ventilating, and air-conditioning (HVAC) technology keeps growing towards providing people with good thermal comfort and indoor air quality. Most buildings use a centralized air-conditioning system in which the air-handling configuration of variable air volume (VAV) system focuses on controlling the zone temperature. But, some of the areas in the zone facing under-actuated and over-actuated airflow lead to the distortion of thermal comfort. Some indoor areas get too cold, and some get too hot due to improper air distribution. The indoor temperature inconsistency will affect the occupants' productivity and work performance. The main focus of this research is to improve the indoor environment's thermal performance by implementing an active air damper as an air controlling device for a centralized air-conditioning system. Indirectly, this will provide the control of temperature for a specific area in the zone with a VAV system. This paper presents the simulation results on the effect of the air damper pattern and its opening parameter against the temperature and airflow distribution in enhancing the thermal comfort performance. The simulation was performed using Ansys FLUENT to analyze three types of air damper patterns: iris, butterfly and radial. The comparison of CFD simulation results shows that the iris damper pattern can provide an acceptable range of temperature of 22 ºC to 24 ºC, which is significant to the desired thermal comfort. The uniform airflow distribution across the indoor area is obtained with no back-flow form in the ducting. Besides, there is a substantial temperature increment when the opening area of inlet airflow is reduced. Therefore, it can be concluded that the iris damper pattern is the best selection for an active air damper since it can provide the best temperature and air flow distribution performance compared to the butterfly and radial air damper.

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Survey of Control Characteristics of Circular Air Dampers in Variable Air Volume Ventilation Systems

Cited by 4 publications

References 2 publications

Comparative Analysis of Energy Use and Human Comfort by an Intelligent Control Model at the Change of Season

Comparative Analysis of Energy Use and Human Comfort by an Intelligent Control Model at the Change of Season

The Comparison of P, PI and PID Strategy Performance as Temperature Controller in Active Iris Damper for Centralized Air Conditioning System

Air Damper Effect on Temperature and Airflow Distribution in Enhancing Thermal Comfort Performance

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