Cooling energy reduction effect of parallel double-window system operation in residential buildings in South Korea

Lee, Seungwon; Leigh, Seung Bok; Kim, Taeyeon; Cheong, Chang Heon; Cho, Sooyoun

doi:10.1177/1420326x17707564

Cited by 11 publications

(10 citation statements)

References 12 publications

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“…Our findings show that the kind of natural ventilation has a significant impact on overheating intensity or cooling demand for both Korean and German apartment buildings. These findings are confirmed by Lee et al (2017) obtaining that natural ventilation for a residential building in Incheon, South Korea, can reduce the cooling energy demand by 60% in comparison unventilated once. For another German multi-residential building, we demonstrated that the realistic reproduction of window ventilation behaviour is vital to calibrate BPS models to monitored room temperature and its significant impact on overheating [64].…”

Section: Interdependence Of Building Design and Climate Conditions On...supporting

confidence: 61%

“…However, in the last years a significant increase in studies focussing overheating evaluations could be obtained all around the globe, e.g. for China [25], in Sudanese [26], for Canada [27], for Honduras [28], for South Korea [29,30], for Austria [31,32], for Italy [33], for Sweden [34] or for Germany [35,36]. This trend highlights that overheating in residential buildings becomes an important global research topic, albeit the terminology of overheating is related to different comfort standards and climate conditions for different countries, cultures and climates.…”

Section: Introductionmentioning

confidence: 99%

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Heat resilience of apartment buildings in Korea and Germany: comparison of building design and climate

Schünemann

Son

Ortlepp

2022

Int J Energy Environ Eng

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A major concern in climate adaptation is to enhance the heat resilient design of residential buildings. However, recent scientific literature addressing overheating analysis is only focussing on individual countries. In this article, we discuss how different design of representative apartment buildings in two countries influences the overheating risk or cooling demand and what conclusions can be drawn from it. This is done for a low-rise apartment building located in Germany and a high-rise building in South Korea applying building performance simulation. Both countries are located in the moderate climate zone, but regional differences in frequency of tropical nights and radiant summer days lead to significant differences in overheating intensity (800 Kh/a for the German and 5100 Kh/a for the Korean) or cooling demand (1800 kWh for the German to 1300 kWh for the Korean). The lower cooling demand but much higher overheating intensity of the Korean building compared to the German is mainly caused by the different solar heat gain due to the glazed balcony design of the Korean building where these balcony rooms are not actively cooled. On the contrary, the common internal façade insulation of Korean buildings results in a higher overheating risk compared to the German building and in addition the lower potential of passive cooling by natural ventilation due to the necessity of insect screens in Korea. The large effect of implementing heat adaptation measures on overheating risk reduction or cooling demand (up to 90%) clearly demonstrates that both buildings are far away from a heat resilient design and that heat adaptation measures can address both climate change adaptation and mitigation.

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Section: Interdependence Of Building Design and Climate Conditions On...supporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Heat resilience of apartment buildings in Korea and Germany: comparison of building design and climate

Schünemann

Son

Ortlepp

2022

Int J Energy Environ Eng

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“…The numerical analysis for the evaluation of the thermal behavior of the abovementioned three samples was carried out through the commercial software package ANSYS v. 16© [51] by means of a 2-D simulation, in stationary state [52], because, according to previous studies, it was demonstrated that the 2-D analysis, using this software, accurately reproduces the behavior of the blocks, close to those obtained in a 3-D analysis for this specific type of polyhedral geometries [53,54].…”

Section: Building the Numerical Modelmentioning

confidence: 99%

Thermal Performance Assessment of Walls Made of Three Types of Sustainable Concrete Blocks by Means of FEM and Validated through an Extensive Measurement Campaign

et al. 2021

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The thermal behavior of three different walls, made with and without by-products, is assessed by means of the Finite Element Method, aiming to evaluate its performance in terms of the sustainable construction of the blocks. Results were compared to those obtained from an experimental campaign, aiming at validation of the model. The by-products used for the blocks were “lime sludge” and “sawdust”, whose performance was compared against the traditional blocks made of concrete as a reference, aiming to demonstrate its sustainability, showing decreases of the thermal transmittance up to 10.5%. Additionally, following the same methodology, the thermal behavior of these above-mentioned blocks but now with added internal insulation made of “recycled cellulose” was assessed, showing higher decreases up to 25.5%, increasing sustainability by addressing an additional reduction in waste, so the right combination of using by-products and the insulating filler in their cavities has been revealed as a promising way of optimizing the walls, offering a relevant improvement in energy savings. Finally, when comparing the U-values of the blocks made of concrete without insulation versus those made of by-products, with insulation, improvements up to 33.3% were reached. The adaptation of the procedure through a moisture correction factor was also incorporated.

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“…The results revealed that natural ventilation can reduce more than 65% of the cooling degree hours. In another study, Lee et al (2019) evaluated the influence of a window with adjustable aperture size, using EnergyPlus. They concluded that employing natural ventilation can decrease cooling energy consumption by 60%.…”

Section: State Of Issuementioning

confidence: 99%

Window geometry impact on a room's wind comfort

Fallahtafti

Mahdavinejad

2021

ECAM

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PurposeNatural ventilation is an environmentally friendly effective way of improving thermal comfort and the quality of indoor conditions if applied properly. This study aims to investigate the physical mechanism of the air movement and also the influence of building geometry in a cross-ventilated room through a parametric study of window geometrical characteristics using computational fluid dynamics.Design/methodology/approachMomentum and continuity equations are solved by the control volume method using a commercially available software. Standard k−ɛ turbulence model is employed to simulate the incompressible airflow and SIMPLE algorithm to solve the conservation equations. Mean air velocity magnitude is measured at three different surfaces of different heights, and the effect of incoming wind velocity inside the building is studied.FindingsThe research concluded that window hood and sill projections reduce indoor wind velocity magnitude, play a major role in incoming wind direction and thus have a crucial impact on wind circulation and indoor air quality.Social implicationsThe paper has evaluated redesigning of a both practical and ornamental architectural element named Palekaneh, which is found in many historical buildings in several hot places in the world. Its optimal design could increase indoor natural ventilation quality and decrease a space's cooling load. Therefore, a new passive cooling architectural element could be re-introduced to the regions previously enjoying such ornaments. This is economically efficient because it eventually saves a considerable amount of energy in the long run and is socially important because of the revitalization of architectural identity.Originality/valueThe role of a building envelope's physical features, although being studied for solar absorption and daylight availability, has rarely been investigated for natural ventilation, especially in a small scale, thus making the paper novel in this regard. This provides a guideline for designers to assess the impact of their design on redirecting wind-induced natural ventilation the very early stages of design.

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Cooling energy reduction effect of parallel double-window system operation in residential buildings in South Korea

Cited by 11 publications

References 12 publications

Heat resilience of apartment buildings in Korea and Germany: comparison of building design and climate

Heat resilience of apartment buildings in Korea and Germany: comparison of building design and climate

Thermal Performance Assessment of Walls Made of Three Types of Sustainable Concrete Blocks by Means of FEM and Validated through an Extensive Measurement Campaign

Window geometry impact on a room's wind comfort

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