The impacts of daytime external envelope heat gain/storage on the nighttime cooling load and the related mitigation measures in a bedroom in the subtropics

Du, Jing; Chan, Ming Yin Jonathan; Pan, Dongmei; Shang, Libin; Deng, Shiming

doi:10.1016/j.enbuild.2016.02.010

Cited by 10 publications

(8 citation statements)

References 18 publications

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“…In the x-direction of this study brick, as shown in Figure 4, by using the Eq. 5and (6), the and has been 14000 and 260 (W/ 2 ), respectively. Those values have been used in Eq.…”

Section: The Study Equations Applicationmentioning

confidence: 99%

“…Although this mechanism achieves suitable insulation performance [5,6], it raises the cost and duration of construction because of the adding of the insulation layer to the main wall [7]. Increasing the thermal resistance of the building walls without affecting the structural properties has been a fundamental aspect, and it should be taken into account through fundamental design steps [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiscale Approach of the Equivalent Thermal Conductivity of Modified Foam-Filled and Non-Filled Hollow Brick and a Brick Wall

Hashim

Almensoury

Ali

et al. 2021

Journal of Thermal Engineering

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The energy loss through building components resulting in higher energy consumption, thus energy saving has become an essential aspect in design and comfort. This study aims to optimize the thermal insulation of red clay bricks used in the walls of buildings by using a multiscale method. The finite element approach in ABAQUS software has been used to simulate the bricks under different configurations and conditions. Due to cost and time challenges and difficulties in simulation and complex calculations, simplified and applicable equations have been derived to calculate thermal insulation properties. The results show that the paper's brick design has a significant thermal conductivity reduction that could reach more than one-third of the other corresponding studies. The study goes to fill the hollow bricks by the insulation polyurethane foam (PUF) and comparing the results with air hollow bricks. Besides its other advantages, the outcomes reveal that using the PUF has a noticeable desired-influence in thermal insulation when considering the heat transfer by convection and radiation inside the air cavity of bricks.

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“…In the x-direction of this study brick, as shown in Figure 4, by using the Eq. 5and (6), the and has been 14000 and 260 (W/ 2 ), respectively. Those values have been used in Eq.…”

Section: The Study Equations Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiscale Approach of the Equivalent Thermal Conductivity of Modified Foam-Filled and Non-Filled Hollow Brick and a Brick Wall

Hashim

Almensoury

Ali

et al. 2021

Journal of Thermal Engineering

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show abstract

“…The intense solar radiation during daytime in sub-tropical summer has considerable effects on the solar heat gain and hence night-time cooling load. 15 The average daily total of night-time cooling degree-hour was then calculated for daily total global solar radiation for each of the intervals of 200 Wm À2 for the TRY and SRY series as well as the two hottest years (2009 and 2014). correlation between night-time cooling and solar radiation for both TRY and SRY series (R 2 ¼ 0.799 and 0.792, respectively).…”

Section: Solar Radiationmentioning

confidence: 99%

Near-extreme summer meteorological data set for sub-tropical climates

Lau

Chan

et al. 2016

Building Services Engineering Research and Technology

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Building performance simulation requires representative weather data of specific locations. Test Reference Year (TRY) and Typical Meteorological Year (TMY) are common hourly dataset for typical year conditions. In sub-tropical climates, overheating is very common in buildings due to high temperature and intense solar radiation. However, there are no universal approaches to develop a dataset for estimating summer discomfort in naturally ventilated and free-running buildings. This article employs the concept of Summer Reference Years (SRY) in order to represent the near-extreme summer conditions in Hong Kong. The derived SRY is able to capture the near-extreme conditions in the multi-year series. The SRY was found to represent the high Tdry values reasonably well during daytime when such near-extreme conditions occur. On the contrary, according to the number of HN-DHs, the SRY does not satisfactorily represent high night-time Tdry. It is possible to incorporate the sorting of Tdry-min in the SRY adjustment in order to better reflect night-time situations in sub-tropical climate. Further studies are therefore required to confirm whether such modifications give more accurate results in the assessment of building energy performance. Nonetheless, the SRY dataset can be applied in building performance simulation and the assessment of indoor thermal comfort. Practical application: The present study found that there are deficiencies for the SRY to represent the high night-time Tdry, which affects the building performance assessment in sub-tropical climates. It suggests potential improvement to the existing adjustment of SRY for representing the near-extreme summer conditions in order to obtain more accurate results of building assessment.

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“…Second, the bedroom has a different operating schedule of A/C unit, maybe being from 11:00pm to 7:00 am. The heat energy released into the bedroom at nighttime will increase the cooling energy of the A/C at night [6]. Therefore, with the year-round subtropical climate, the adoption of PCMs for bedrooms in Hong Kong faced unique challenges.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in this paper, a simulation study on analyzing the impacts of building envelopes integrated with PCMs on the nighttime cooling load reduction in a bedroom in sub-tropics is reported. A west-facing bedroom in a high-rise residential block in Hong Kong was used in a previous related study [6]. The adoption of PCMs to the west-facing external wall for the westfacing bedroom, was also used as a platform to carry out the simulation study.…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Building Envelopes Integrated With Phase Change Materials on the Nighttime Cooling Load Reduction in A Bedroom in Sub‐Tropics

Pan¹,

Pan²,

Zhou³

et al. 2020

Preprint

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The impacts of daytime external envelope heat gain/storage on the nighttime cooling load and the related mitigation measures in a bedroom in the subtropics

Cited by 10 publications

References 18 publications

Multiscale Approach of the Equivalent Thermal Conductivity of Modified Foam-Filled and Non-Filled Hollow Brick and a Brick Wall

Multiscale Approach of the Equivalent Thermal Conductivity of Modified Foam-Filled and Non-Filled Hollow Brick and a Brick Wall

Near-extreme summer meteorological data set for sub-tropical climates

The Impacts of Building Envelopes Integrated With Phase Change Materials on the Nighttime Cooling Load Reduction in A Bedroom in Sub‐Tropics

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