Investigation of thermal indoor climate for a passive house in a sub-Arctic region using computational fluid dynamics

Risberg, Daniel; Risberg, Mikael; Westerlund, Lars

doi:10.1177/1420326x17753707

Cited by 13 publications

(11 citation statements)

References 28 publications

(32 reference statements)

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“…In buildings, CFD can be extensively used to analyze energy consumption and to model the system with respect to real values. Risberg et al simulated the heat supply through ventilation ducts placed at the ceiling in Swedish houses with passive house standards [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Thermal Performance of Trombe Wall for Passive Solar Building in Semiarid Climate

Dhahri

Khalilpoor

Aouinet

et al. 2021

International Journal of Photoenergy

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The largest amount of energy in buildings is consumed to provide heating, cooling, and ventilation. Therefore, a practical solution such as using renewable energy sources can be considered to reduce energy costs and pollutants. In addition, architecture principles must be varied to utilize passive solar energy and also to reduce energy losses. In this research, a numerical study is presented to investigate the thermal behavior of TW-FR (Trombe wall placed in a fenestrated room) in the semiarid region of Tunisia. Computational fluid dynamic (CFD) simulation of fluid flow and heat transfer shows good agreement with published data in literature. The thermal comfort level was calculated according to ASHRAE (55-2013). The results show that (i) the normal Trombe wall cannot assure a satisfactory comfort level even in summer conditions and a higher vertical temperature gradient can take a value of 15°C, and the Trombe wall is shown to be more efficient in heating mode in the studied semi-arid region compared to cooling; (ii) the operative temperature for the coldest winter is between 17.85 and 19.85°C. The air temperature gradient in the comfort ranges between the head and feet is 2.3°C; and (iii) the Trombe wall is an excellent solution for Sousse city weather; it is suggested that the passive system (TW-FR) will be examined for a whole year to have a precise evaluation of its efficiency.

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Section: Introductionmentioning

confidence: 99%

Numerical Study on the Thermal Performance of Trombe Wall for Passive Solar Building in Semiarid Climate

Dhahri

Khalilpoor

Aouinet

et al. 2021

International Journal of Photoenergy

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“…Compared to the active cooling in buildings, passive cooling technology attracts more attention due to its ability to operate without external energy. 3,4 As a passive cooling technology, radiative cooling, which generates "free" cooling to buildings, accounts for the heat transfer between the radiant surface and outer space, where the temperature is close to absolute zero, through an atmospheric window, which has a high transmittance of 8-13 mm. [5][6][7][8] The majority of the previous studies in this field have focused on nocturnal radiative cooling.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the impact of a novel cool roof on cooling performance for a low-rise prefabricated building in China

Zhang

Chen

et al. 2020

Building Services Engineering Research and Technology

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The recently proposed scalable-manufactured randomized glass-polymer hybrid metamaterial (i.e. metamaterial film) exhibits good energy-saving potential for building applications. The most convenient way to employ this metamaterial film-based radiative cooling is to integrate it with buildings as cool roofs. However, metamaterial film-based radiative cooling is more suitable for buildings with higher roof area to floor area ratios, as this accounts for its relative lower cooling power of 110 W/m2 on a daily average. The prefabricated buildings in China are commonly less than two floors, which are preferable for the application of this metamaterial film-based radiative cooling. To clearly reveal the cooling performance of the metamaterial film-based cool roof (MFCR), a single-floor prefabricated building is modelled in this study, and the energy-saving potential and economic feasibility of the application of the MFCR on the prefabricated building are discussed in detail. When comparing the model in this study with buildings that have the more commonly used shingle roofs or typical white roofs, the annual cooling electricity consumption is reduced by 28.9%–43.0% and 7.8%–12.9%, respectively, for buildings with MFCRs located in five cities in China, each in a different climate zone. Furthermore, the simple payback period for the buildings with MFCRs located in all five climate zones is less than three years compared to the buildings with shingle roofs. Practical application: A recently proposed metamaterial film exhibits good energy-saving potential for building applications. This paper explores the application of this metamaterial film as a cool roof on a low-rise prefabricated building. The analysis of the cooling performance and economic value of this low-rise prefabricated building located in all five climate zones in China provides guiding significance for the application of MFCR.

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“…4 Therefore, natural ventilation is increasingly considered as a preference for eco-friendly building constructions. 5 However, natural ventilation is often utilised as an auxiliary ventilation method in buildings due to the arbitrary properties of natural wind. 6 Introducing excess natural wind might not achieve the desired goal but even cause thermal discomfort.…”

Section: Introductionmentioning

confidence: 99%

“…4 Therefore, natural ventilation is increasingly considered as a preference for eco-friendly building constructions. 5…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of local thermal comfort in a plan office under natural ventilation

Deng

Tan

2019

Indoor and Built Environment

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The utilisation of automatic controlled natural wind in office buildings to maintain indoor thermal comfort has gained wide attention in recent years. Generally, it is not necessary to ensure that the whole internal volume of a building with large open spaces meets thermal comfort requirements. Primary focus should be on occupied areas. Accordingly, the local thermal comfort in an open-plan office with automatic controlled natural ventilation system was investigated numerically and experimentally. A computational fluid dynamics (CFD)-based method was presented for indoor environment and thermal comfort prediction. Long-term in situ measurement was conducted during summer and transition seasons. The meteorological data were collected by a mini weather station located on the roof of the target building. Meanwhile, indoor air velocity, temperature, turbulence intensity and wall temperatures were recorded locally. Three thermal comfort indices, i.e. thermal stratification represented by percentage dissatisfied (PD), the extended predicted mean vote (PMVe) and draught rate were employed to evaluate the thermal comfort level of the interested areas during natural ventilation period. The numerical results revealed a risk of local thermal dissatisfaction under low outdoor temperature and strong windy conditions.

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Investigation of thermal indoor climate for a passive house in a sub-Arctic region using computational fluid dynamics

Cited by 13 publications

References 28 publications

Numerical Study on the Thermal Performance of Trombe Wall for Passive Solar Building in Semiarid Climate

Numerical Study on the Thermal Performance of Trombe Wall for Passive Solar Building in Semiarid Climate

Analysis of the impact of a novel cool roof on cooling performance for a low-rise prefabricated building in China

Numerical analysis of local thermal comfort in a plan office under natural ventilation

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