Free convection heat transfer from a window glazing with an insect screen

Naylor, David; Foroushani, Seyed Sepehr Mohaddes; Zalcman, Daniel

doi:10.1016/j.enbuild.2016.11.062

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…where the radiosity, J, represents the sum of the gray body radiation of temperature and the incident radiation, and it can be expressed as Equation (18).…”

Section: Heat Transfer Of Building Constructionmentioning

confidence: 99%

“…Although there are very few directly related studies about the HHCF, plenty of investigations about the thermal performance of passive solar houses with the direct solar gain window [17][18][19][20][21][22] or the thermal storage wall [23][24][25][26] could provide effective research techniques for analyzing the thermal performance of the HHCF. Through literature research, it can be found that experiments and numerical simulations are two widely used methods.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Thermal Performance of a Hybrid Heat Collecting Facade Used for Passive Solar Buildings in Cold Region

Wang

Lei

et al. 2019

Energies

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Passive solar technologies are traditionally considered as cost-effective ways for the building heating. However, conventional passive solar buildings are insufficient to create a relatively stable and comfortable indoor thermal environment. To further increase the indoor air temperature and reduce the heating energy consumption, a hybrid heat collecting facade (HHCF) is proposed in this paper. To analyze the thermal performance of the HHCF, a heat transfer model based on the heat balance method is established and validated by experimental results. Meanwhile, the energy saving potential of a room with the HHCF is evaluated as well. When the HHCF is applied to places where heating is required in the cold season while refrigeration is unnecessary in hot season, the HHCF can reduce the heating need by 40.2% and 21.5% compared with the conventional direct solar heat gain window and the Trombe wall, respectively. Furthermore, a series of parametric analyses are performed to investigate the thermal performance of the room with HHCF under various design and operating conditions. It is found that the thermal performance of the HHCF mainly depends on the window operational schedule, the width and the absorptivity of heat collecting wall, and the thermal performance of the inner double-glass window. The modeling and the parametric study in this paper are beneficial to the design and the optimization of the HHCF in passive solar buildings.

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“…where the radiosity, J, represents the sum of the gray body radiation of temperature and the incident radiation, and it can be expressed as Equation (18).…”

Section: Heat Transfer Of Building Constructionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Thermal Performance of a Hybrid Heat Collecting Facade Used for Passive Solar Buildings in Cold Region

Wang

Lei

et al. 2019

Energies

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“…They chose the lattice Boltzmann approach to solve equations. Naylor et al [4] studied numerically thermogravitational convection from a window glazing with an insect shield simulated like a porous layer and found that the shield has negligible influence on convective thermal transmission for high values of Ra. Astanina et al [5] analyzed numerically thermogravitational convection in a partially porous cavity with a heat-generating source.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Heat-Conducting Solid Wall and Heat-Generating Element on Free Convection of Al2O3/H2O Nanofluid in a Cavity with Open Border

et al. 2018

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Development of modern electronic devices demands a creation of effective cooling systems in the form of active or passive nature. More optimal technique for an origination of such cooling arrangement is a mathematical simulation taking into account the major physical processes which define the considered phenomena. Thermogravitational convection in a partially open alumina-water nanoliquid region under the impacts of constant heat generation element and heat-conducting solid wall is analyzed numerically. A solid heat-conducting wall is a left vertical wall cooled from outside, while a local solid element is placed on the base and kept at constant volumetric heat generation. The right border is supposed to be partially open in order to cool the local heater. The considered domain of interest is an electronic cabinet, while the heat-generating element is an electronic chip. Partial differential equations of mathematical physics formulated in non-primitive variables are worked out by the second order finite difference method. Influences of the Rayleigh number, heat-transfer capacity ratio, location of the local heater and nanoparticles volume fraction on liquid circulation and thermal transmission are investigated. It was ascertained that an inclusion of nanosized alumina particles to the base liquid can lead to the average heater temperature decreasing, that depends on the heater location and internal volumetric heat generation. Therefore, an inclusion of nanoparticles inside the host liquid can essentially intensify the heat removal from the heater that is the major challenge in different engineering applications. Moreover, an effect of nanosized alumina particles is more essential in the case of low intensive convective flow and when the heater is placed near the cooling wall.

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“…The development of three-dimensional modelling of thermal processes in material structures has resulted in many studies that comprehensively describe the phenomena of heat flow through building barriers. This applies to all groups of buildings: construction of traditional masonry [11,12] frame construction [13], transparent barriers [14] and those using phase change material [15][16][17][18]. Current studies concern both theoretical solutions and their applications in practice [19,20].…”

Section: Introductionmentioning

confidence: 99%

The influence of a thermal bridge in the corner of the walls on the possibility of water vapour condensation

Miąsik

Lichołai

2018

E3S Web Conf.

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The article presents an analysis of temperature on an internal wall surface. Simulations on the external wall corner were also carried out. It is a place where the surface temperature is lower due to the thermal bridge effect. The calculations were performed with the ADINA program used for numerical simulations on heat transfer through divisional structures. Finite element analysis was employed to solve the task. The calculations were performed for five case studies with different corner structures and different methods of insulation. The baseline was a wall with the heat transfer coefficient U = 0,30 W/(m2K). The reason for selecting such a coefficient for analysis was due to the fact that in most Polish buildings thermal resistance of walls results from technical norms from before January 2014. The findings of the numerical simulations were used to determine the maximum relative humidity of the internal air where water vapour condensation may occur on the internal surface of the corner. The calculations were crucial to making a qualitative assessment of the employed solutions. The findings showed that it is possible to improve the thermal functioning of a wall in the corner thanks to an additional layer of thermal insulation, for example in the form of an avant-corps, placed within the corner.

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Free convection heat transfer from a window glazing with an insect screen

Cited by 9 publications

References 6 publications

Study on the Thermal Performance of a Hybrid Heat Collecting Facade Used for Passive Solar Buildings in Cold Region

Study on the Thermal Performance of a Hybrid Heat Collecting Facade Used for Passive Solar Buildings in Cold Region

Impacts of Heat-Conducting Solid Wall and Heat-Generating Element on Free Convection of Al2O3/H2O Nanofluid in a Cavity with Open Border

The influence of a thermal bridge in the corner of the walls on the possibility of water vapour condensation

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