A study on the control method of single duct VAV terminal unit through the determination of proper minimum air flow

Kang, Su-Hyun; Kim, Hyo-Jun; Cho, Young-Hum

doi:10.1016/j.enbuild.2013.11.005

Cited by 39 publications

(19 citation statements)

References 15 publications

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“…The indoor temperature setpoint was 24°C. 10) The walls of the simulation model consisted of wood shingle over plywood, polystyrene insulation, and gypboard arranged in the construction shown in Table 2. The gravel built-up roof contained a combination of polystyrene insulation and plywood sheathing.…”

Section: Existing Control Methods Of Vav Terminal Unit 31 Simulation mentioning

confidence: 99%

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

Kim

Kang²,

Cho

2015

Journal of Asian Architecture and Building Engineering

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The objective of this study was to propose a stratification control method for the minimum air flow of a variable air volume (VAV) terminal unit. The minimum air flow rate of the VAV terminal unit is the key factor affecting thermal comfort, indoor air quality (IAQ), stratification and energy consumption depending on the operating mode of the VAV system. Therefore, selecting the proper minimum air flow is very important. In this study, a building simulation was conducted to evaluate the indoor thermal comfort, stratification, IAQ and energy consumption according to the fixed minimum air flow rate of the VAV terminal units. In addition, an algorithm was proposed considering the stratification and variable minimum air flow rate depending on the indoor load. The results of the fixed minimum air flow rate simulation showed that the minimum air flow rate considering stratification satisfies all the conditions of indoor thermal comfort, IAQ and without stratification. The proposed method was found to be more effective than the existing control method. The energy comparison with the existing control method showed that the proposed method reduces the energy consumption.

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Section: Existing Control Methods Of Vav Terminal Unit 31 Simulation mentioning

confidence: 99%

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

Kim

Kang²,

Cho

2015

Journal of Asian Architecture and Building Engineering

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“…In [14], the authors presented and investigative work for multizone buildings in VAV static pressure control by statistically informed data. A control technique to lower the air flow rate in the VAV terminal unit for an office building was presented in [15]. Minimum air was supplied to the terminal unit by keeping IAQ at an acceptable level.…”

Section: Introductionmentioning

confidence: 99%

Optimization of BuildingsEnergy Consumption by Designing Sliding Mode Control for Multizone VAV Air Conditioning Systems

Shah

Huang

et al. 2018

Energies

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Variable air volume (VAV) is the most common installation among heating ventilating and air conditioning (HVAC) systems. To maintain the comfort level and lessen energy utilization, there is a pressing need for its effective control. In this study, a lumped parameter model composed of multizone VAV is considered, and sliding mode control (SMC) is designed to guarantee robust operation in the presence of uncertainties. For comparison of the proposed controller performance, a proportional integral derivative (PID) controller is additionally designed. The indoor temperature of zones is controlled by positioning the supply air dampers. Tracking objectives of controllers are inspected via two practical cases of desired temperature setpoints including (a) sinusoidal waveform and (b) the combination of steps. Results obtained using SMC ensure the robust operation of the VAV system against parametric uncertainties. In addition, SMC is more energy efficient than PID in terms of overshoot and settling time.

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“…"To analyze the stratification, the space was separated into 17 horizontal nodes with 0.2 m intervals from the bottom. This divided the internal heating elements among each horizontal node" [16]. Figure 10 shows the indoor vertical temperature difference in the proposed control algorithm at the peak load in winter.…”

Section: Indoor Vertical Temperature Differencementioning

confidence: 99%

A Study on a Control Method with a Ventilation Requirement of a VAV System in Multi-Zone

Kim

Cho

2017

Sustainability

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Abstract:The objective of this study was to propose a control method with a ventilation requirement of variable air volume (VAV) system in multi-zone. In order to control the VAV system inmulti-zone, it is essential to control the terminal unit installed in each zone. A VAV terminal unit with conventional control method using a fixed minimum air flow can cause indoor air quality (IAQ) issues depending on the variation in the number of occupants. This research proposes a control method with a ventilation requirement of the VAV terminal unit and AHU inmulti-zone. The integrated control method with an air flow increase model in the VAV terminal unit, AHU, and outdoor air intake rate increase model in the AHU was based on the indoor CO 2 concentration. The conventional and proposed control algorithms were compared through a TRNSYS simulation program. The proposed VAV terminal unit control method satisfies all the conditions of indoor temperature, IAQ, and stratification. An energy comparison with the conventional control method showed that the method satisfies not only the indoor thermal comfort, IAQ, and stratification issue, but also reduces the energy consumption.

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A study on the control method of single duct VAV terminal unit through the determination of proper minimum air flow

Cited by 39 publications

References 15 publications

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

A Study on the Control Method Without Stratification of Single Duct VAV Terminal Units

Optimization of BuildingsEnergy Consumption by Designing Sliding Mode Control for Multizone VAV Air Conditioning Systems

A Study on a Control Method with a Ventilation Requirement of a VAV System in Multi-Zone

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