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

Kim, Hyo-Jun; Cho, Young-Hum

doi:10.3390/su9112066

Cited by 13 publications

(5 citation statements)

References 19 publications

(13 reference statements)

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“…Disinfection methods as simple as continuous renewal of air through opening windows can be efficient, but this is not a reasonable option in many climates. Air conditioning (AC) and central heating systems provide continuous access to circulating air (100% room volume circulation every 10–20 min , with fresh air replacement every 40–60 min and higher rates in sensitive environments such as research laboratories and operating rooms), incorporating sophisticated methods to control air flow and ventilation in multizone spaces …”

Section: Pathways Of Infection In Daily Lifementioning

confidence: 99%

Back to Normal: An Old Physics Route to Reduce SARS-CoV-2 Transmission in Indoor Spaces

et al. 2020

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We advocate the widespread use of UV-C light as a short-term, easily deployable, and affordable way to limit virus spread in the current SARS-CoV-2 pandemic. Radical social distancing with the associated shutdown of schools, restaurants, sport clubs, workplaces, and traveling has been shown to be effective in reducing virus spread, but its economic and social costs are unsustainable in the medium term. Simple measures like frequent handwashing, facial masks, and other physical barriers are being commonly adopted to prevent virus transmission. However, their efficacy may be limited, particularly in shared indoor spaces, where, in addition to airborne transmission, elements with small surface areas such as elevator buttons, door handles, and handrails are frequently used and can also mediate transmission. We argue that additional measures are necessary to reduce virus transmission when people resume attending schools and jobs that require proximity or some degree of physical contact. Among the available alternatives, UV-C light satisfies the requirements of rapid, widespread, and economically viable deployment. Its implementation is only limited by current production capacities, an increase of which requires swift intervention by industry and authorities.

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Section: Pathways Of Infection In Daily Lifementioning

confidence: 99%

Back to Normal: An Old Physics Route to Reduce SARS-CoV-2 Transmission in Indoor Spaces

et al. 2020

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“…Following the CO 2 based controls, Kim et al [22] proposed a VAV terminal unit control method that meets the ventilation requirement to control IAQ by controlling the air flow rate. The idea is to delay the outdoor air inlet time and to reduce the outdoor air flow rate, to control the CO 2 concentrations in the conditioned spaces.…”

Section: Co 2 -Based Control Strategiesmentioning

confidence: 99%

“…In conventional systems, VAV boxes play a major role in both energy consumption and thermal comfort as they control the overall airflow required (but struggle with and are restricted to a 30% minimum supply to avoid airdrop) by the system as well as the airflow delivered to each zone. They have multiple components such as a controller, temperature sensor, actuator, damper, reheating coil and air flow sensor [22], VAV boxes are complex devices with embedded electronics which are expensive and prone to failures [15,19]. Hence, they are only applicable to large or medium construction projects [7].…”

Section: Introductionmentioning

confidence: 99%

Control Strategies in Multi-Zone Air Conditioning Systems

Rismanchi

Zambrano

Saxby³

et al. 2019

Energies

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In a commercial building, a significant amount of energy is used by the ventilation systems to condition the air for the ‎indoor environments to satisfy the required quantity (temperature ‎and humidity) and quality (amount of fresh air). For many years, Variable Air Volume ‎‎(VAV) systems have been considered as the most efficient solutions by balancing the airflow volume based on the demand making them energy efficient when compared with the traditional Constant Air Volume (CAV) systems. However, the setpoints in VAV systems are ‎often misread by the sensors due to stratification and formation of pollutant pockets and ‎responding to design levels that overestimate the real-time demand conditions, which result in ‎waste of energy, thermal discomfort and unhealthy air. In general, VAV devices are expensive, complicated and prone to failures and ‎they are used only in medium and large projects. More recently, new technologies have evolved to solve this issue. In one of the new solutions, VAV motors terminals are replaced with flaps which are simpler and less expensive thus, they can be implemented ‎in a wider range of projects. In systems, balancing and supplying the optimal airflow ‎to reduce the energy consumption while delivering ideal thermal and Indoor Air Quality (IAQ) levels are the ‎main challenges. In this paper, a comparison of the recent technologies with traditional VAV systems is presented to be used as a guild line for researchers and designers in the field of Heating Ventilation Air Conditioning (HVAC)‎.

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“…Indicatively, the energy flow analysis with different technologies and systems' sizes and the evaluation of the achieved energy savings are investigated in [1], while different operation strategies for the involved economizer's dampers have been proposed in [2]. Alternative control methods of the variable air volume (VAV) systems operation, aiming at the minimisation of the energy consumption by exploiting the ventilation needs through the economizer constitutes another common research topic in the relevant literature [3,4]. A review article is available in [5], covering a wide range of topics related to the VAV systems: Most recent technologies on air flow control, simulation and modelling of the VAV systems, control strategies and optimization tools, faults detection and remedies.…”

Section: Physical Cooling and Heat Recoverymentioning

confidence: 99%

Operation Algorithms and Computational Simulation of Physical Cooling and Heat Recovery for Indoor Space Conditioning. A Case Study for a Hydro Power Plant in Lugano, Switzerland

Katsaprakakis

Kagiamis²,

Zidianakis

et al. 2019

Sustainability

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This article presents the computational simulation process and the operation algorithms of the VAV and VRV systems, for indoor space conditioning, with extensive physical cooling and heat recovery. Through the introduction of appropriate operation algorithms, the article aims to highlight the high energy saving potential on indoor space conditioning, by exploiting physical cooling and heat recovery processes. The proposed algorithms are evaluated with a case study for a hydro power plant building located in the area of Lugano, Switzerland, with significant cooling needs for the whole year, due to high internal heat gains from indoor electrical equipment. This fact enables physical cooling during winter, for the cooling load coverage, and heat recovery, for the concurrent heating load coverage in different thermal zones of the building. Analytical operation algorithms are developed for a VAV and a VRV system. Both algorithms are computationally simulated. With the VAV system, 86.1% and 63.7% of the annual cooling and heating demand, respectively are covered by physical cooling and heat recovery. With the VRV system, 58.5% of the annual heating demand is covered by heat recovery. The set-up cost of the VAV system is almost twice higher than the set-up cost of the VRV system.

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

Cited by 13 publications

References 19 publications

Back to Normal: An Old Physics Route to Reduce SARS-CoV-2 Transmission in Indoor Spaces

Back to Normal: An Old Physics Route to Reduce SARS-CoV-2 Transmission in Indoor Spaces

Control Strategies in Multi-Zone Air Conditioning Systems

Operation Algorithms and Computational Simulation of Physical Cooling and Heat Recovery for Indoor Space Conditioning. A Case Study for a Hydro Power Plant in Lugano, Switzerland

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