Study on Cold Storage of Phase Change Material on the Floor of a House With Night Natural Ventilation

Lee, Taecheol; Sato, Rihito; Asawa, Takashi; Kawai, Hidenori; Hirayama, Yukari; Ohta, Isamu; Sato, Yuki; Hayashi, Yoshihiko

doi:10.3130/aije.82.1025

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Measurements [33] were conducted to clarify the variables that affect the indoor temperature distribution during night ventilation through the floor-level windows. During night ventilation, the cold storage of the PCMs installed on the floor of the room was determined, and the variables affecting cold storage were analyzed.…”

Section: Measurementmentioning

confidence: 99%

Indoor Air Temperature Distribution and Heat Transfer Coefficient for Evaluating Cold Storage of Phase-Change Materials during Night Ventilation

Lee,

Sato,

Asawa

et al. 2024

Buildings

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This paper focuses on clarifying the heat transfer coefficient necessary for determining the indoor temperature distribution during night ventilation using floor-level windows. Measurements were used to identify the factors that influence the vertical temperature distribution within a room wherein phase-change materials (PCMs) were installed at the floor level. The investigation revealed a temperature differential ranging from 1 °C to a maximum of 3 °C between the floor and the center of the room, attributable to external climatic conditions (outdoor temperature and wind speed). This variation was found to depend on the degree of mixing of indoor air currents. This deviation was critical because it significantly affected the phase-change temperature of PCMs, thereby impacting their thermal storage capabilities. Consequently, this study aimed to refine the predictive accuracy of indoor temperature distributions by proposing a modified vertical temperature distribution model that incorporated these findings. The results of this study are expected to provide better design strategies for building constructions that incorporate PCMs, and to optimize their functionality in passive cooling systems.

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Section: Measurementmentioning

confidence: 99%

Indoor Air Temperature Distribution and Heat Transfer Coefficient for Evaluating Cold Storage of Phase-Change Materials during Night Ventilation

Lee,

Sato,

Asawa

et al. 2024

Buildings

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“…In snowy regions, light from the ground can be introduced inside by floor-level windows [22]. Additionally, floor-level windows can be combined with phase change material for cold storage during night ventilation [23] and green roofs for thermal performance [24].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis on Effect of Passive Cooling Methods on an Indoor Thermal Environment Having Floor-Level Windows

Qin

Asawa

et al. 2022

Sustainability

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Natural ventilation is a common passive cooling method for improving air quality and thermal comfort; however, hot temperatures in summer and safety and privacy issues at night often result in its unideal performance. Therefore, we proposed the use of floor-level windows, mainly combined with microclimate improvement, to improve the indoor thermal environment by enhancing the cooling effect of natural ventilation during summer. Our study area was a house in Machida, Tokyo. We evaluated the effectiveness of our method in improving the indoor thermal environment in summer and performed a numerical simulation, while illustrating the detailed horizontal and vertical distribution of airflow in the house through the floor-level windows. The influence of different window types and opening angles of floor-level windows on ventilation and cooling was determined using the simulation. We found that: (a) natural ventilation-based passive cooling methods reduced semi-outdoor and indoor temperature and increased the humidity; (b) the airflow formed an indoor wind path; south-westerly inflow was from western floor-level windows and the skylight, and the outflow was from northern floor-level windows; and (c) the side hung windows (with an opening angle of 60°) were an ideal option to improve indoor airflow. However, there was no improvement in the passive cooling performance, due to the inflow of warmer outside air.

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Thermal storage effect of radiant floor cooling system using phase change materials in the hot and humid climate of Indonesia

Kitagawa¹,

Asawa

Kubota

et al. 2022

Building and Environment

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Study on Cold Storage of Phase Change Material on the Floor of a House With Night Natural Ventilation

Cited by 3 publications

References 7 publications

Indoor Air Temperature Distribution and Heat Transfer Coefficient for Evaluating Cold Storage of Phase-Change Materials during Night Ventilation

Indoor Air Temperature Distribution and Heat Transfer Coefficient for Evaluating Cold Storage of Phase-Change Materials during Night Ventilation

Experimental and Numerical Analysis on Effect of Passive Cooling Methods on an Indoor Thermal Environment Having Floor-Level Windows

Thermal storage effect of radiant floor cooling system using phase change materials in the hot and humid climate of Indonesia

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