Thermal uniformity in an open plan room with an active chilled beam system and conventional air distribution systems

Rhee, Kyu-Nam; Shin, Mi-Su; Choi, Sungyong

doi:10.1016/j.enbuild.2015.01.068

Cited by 50 publications

(21 citation statements)

References 14 publications

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“…However, there are not enough well-defined regulations specific to chilled beams in Korea. Thus, as a reference, we used the REHVA standard and the results of previous studies [78][79][80] that verified the energy-saving effect of chilled beams in Korean climate to set the entrance temperature for hot-cool water. We installed the most common two-way diffusion chilled beam, and we used the outdoor air pre-processed by the DOAS as a primary air for the chilled beam [77].…”

Section: Selection Of Active Systems (Cases 6-13)mentioning

confidence: 99%

Analysis of Energy Saving Potential in High-Performance Building Technologies under Korean Climatic Conditions

2018

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This study aims to suggest a basis for the selection of technologies for developing high-performance buildings to reduce energy consumption and greenhouse gas emissions. Energy-saving technologies comprising 15 cases were categorized into passive, active, and renewable energy systems. EnergyPlus v8.8.0 was used to analyze the contribution of each technology in reducing the primary energy consumptions and CO 2 emissions in the Korean climate. The primary energy consumptions of the base model were 464.1 and 485.1 kWh/m 2 a in the Incheon and Jeju region, respectively, and the CO 2 emissions were 83.4 and 87.4 kgCO 2 /m 2 a, respectively. Each technology (cases 1-15) provided different energy-saving contributions in the Korean climate depending on their characteristics. The heating, cooling, and other energy-saving contributions of each technology indicate that their saving rates can be used when selecting suitable technologies during the cooling and heating seasons. Case 15 (active chilled beam with dedicated outdoor air system + ground source heat pump) showed the highest energy saving rate. In case 15, the Incheon and Jeju models were reduced by 189.4 (59.2%) and 206.2 kWh/m 2 a (57.4%) compared to the base case, respectively, and the CO 2 emissions were reduced by up to 32.7 (60.8%) and 35.6 kgCO 2 /m 2 a (59.3%), respectively.

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Section: Selection Of Active Systems (Cases 6-13)mentioning

confidence: 99%

Analysis of Energy Saving Potential in High-Performance Building Technologies under Korean Climatic Conditions

2018

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“…If the Beta distribution applies, it may be possible to quantify the characteristic curves in Figure 1 for various situations mathematically based on the general model of the Beta distribution. This paper first introduces the Beta distribution and its background theory of the order statistics, then validates the findings by the measurement data of the five warehouse and storage spaces, 20 and eleven published studies [5][6][7][8][9][10][11]13,15,23,38 from the literature. This paper also discusses a few practical implications and applications of these findings.…”

Section: Practical Implicationsmentioning

confidence: 69%

“…In buoyancy-driven ventilated spaces including displacement [5][6][7] and/or underfloor ventilation systems, [8][9][10][11][12] and natural ventilation in large spaces 13,14 during cooling seasons; and 3). In buoyancy-driven ventilated spaces including displacement [5][6][7] and/or underfloor ventilation systems, [8][9][10][11][12] and natural ventilation in large spaces 13,14 during cooling seasons; and 3).…”

mentioning

confidence: 99%

“…In large industrial warehouses and storage facilities especially in winter seasons 2-4 ;(ii). In buoyancy-driven ventilated spaces including displacement [5][6][7] and/or underfloor ventilation systems, [8][9][10][11][12] and natural ventilation in large spaces 13,14 during cooling seasons; and 3). In a more extreme stratification case, such as during enclosure fire, buoyancy-driven hot smoke rises to form an upper smoke layer on the top of a cold lower air layer.…”

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confidence: 99%

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Indoor thermal stratification and its statistical distribution

Wang

Zhang

2018

Indoor Air

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Thermal stratification is established when warmer air rises and cooler air descends under thermal buoyancy. It occurs in indoor environment situations including large warehouse‐type buildings, buoyancy‐driven ventilated spaces with displacement, underfloor ventilation, and/or natural ventilation, and enclosure fires with hot smoke layer on top of cold air layer. This paper reports a recent study that thermal stratification of indoor environment follows the statistical Beta distribution so the vertical temperature distribution is the Cumulative Distribution Function of the Beta distribution defined by two shape parameters, Alpha (α) and Beta (β), despite ventilation types, heat source and other details. It is then possible to estimate a complete vertical temperature profile under thermal stratification by four temperature points (ie, 4‐point Beta distribution), or as few as two points (ie, 2‐point Beta distribution) with a slight loss of accuracy. The study was confirmed by the field measurement data of five warehouse‐type buildings, and eleven thermal stratification studies from the literature. A few applications were demonstrated including quantitative characterization of thermal stratification; estimation of mean and spatial temperature uniformities and other key parameters. The dimensionless nature of the methodology may also be potentially applied to other indoor stratification phenomena.

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“…The performance of these systems is extensively analyzed in various recent studies. Most of the research is based on either computer simulations, mainly computational fluid dynamics (CFD) studies or studies conducted in controlled laboratory environments [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. The research in real office settings is mainly focused on buildings located in warm and hot climate countries, dominated by cooling need [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Cooling Period Thermal Comfort Assessment in Modern Open Office Landscape in Estonia

Kiil

Simson

Thalfeldt

et al. 2019

Preprint

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Local thermal comfort (TC) and draught rate (DR) has been studied widely. There has been more meaningful research performed in controlled boundary condition situations than in actual work environments involving occupants. TC conditions in office buildings in Estonia have been barely investigated in the past. In this paper, the results of TC and DR assessment in five office buildings in Tallinn are presented and discussed. Studied office landscapes vary in heating, ventilation and cooling (HVAC) system parameters, room units and elements. All sample buildings were less than six years old, equipped with dedicated outdoor air ventilation system and room conditioning units. The on-site measurements consisted of TC and DR assessment with indoor climate questionnaire (ICQ). The purpose of the survey is to assess the correspondence between HVAC design and the actual situation. Results show, whether and in what extent the standard-based criteria for TC is suitable for actual usage of the occupants. Preferring one room conditioning unit type or system may not guarantee better thermal environment without draught. Although some HVAC systems observed in this study should create the prerequisites for ensuring more comfort, results show that this is not the case for all buildings in this study.

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Thermal uniformity in an open plan room with an active chilled beam system and conventional air distribution systems

Cited by 50 publications

References 14 publications

Analysis of Energy Saving Potential in High-Performance Building Technologies under Korean Climatic Conditions

Analysis of Energy Saving Potential in High-Performance Building Technologies under Korean Climatic Conditions

Indoor thermal stratification and its statistical distribution

A Comparative Study on Cooling Period Thermal Comfort Assessment in Modern Open Office Landscape in Estonia

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