An analytical approach to assess the influence of the massive wall material, thickness and ventilation system on the Trombe wall thermal performance

Briga-Sá, Ana; Martins, Analisa; Boaventura‐Cunha, José; Lanzinha, João; Paiva, Anabela

doi:10.1177/1744259117697389

Cited by 24 publications

(3 citation statements)

References 28 publications

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“…It was noticed that a certain thermal inertia in the slab provides better indoor comfort in both summer and winter. Briga Sá et al [14] described the influence of the massive wall material, thickness and ventilation system on the Trombe wall thermal performance. It has been demonstrated that during the heating season, for the nonventilated Trombe wall, the global heat gains decrease is not proportional to the thickness increase.…”

Section: Introductionmentioning

confidence: 99%

Transient Effects in Intermittently Heated Buildings-Measurements Versus Calculation

2022

Teh. vjesn.

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Transient effects in the buildings energy balance are very important and could be dominant in some cases, especially for long setback schedule in the heating system operation. Thermal behaviour of insulated and intermittently heated buildings requires advanced calculation tools for proper estimation of the room/building heat balance. This is especially important for buildings where the heating system is on for up to 10 hours per day. In these buildings the transient effects are dominant and inner walls, due to their significant thermal capacity, strongly influence the variation of the room air temperature in time. In this paper inner walls are divided into side and top/bottom walls and are modelled with transient heat conduction equation each, instead of lumped-thermal-capacity method. Model for simulation is made by using Modelica Buildings Library in Dymola environment. Temperature measurements are recorded in one representative room and measured values are compared with results of simulation. Two cases are analyzed, one with variation of the air room temperature when the thermal inertia of the inner walls is taken into account, and the other where this effect is neglected. The results showed significant variation of the room temperature in the case where heat exchange between the inner walls and room air is neglected compared to the case where thermal inertia of the inner walls is taken into consideration. In case with no influence of the inner walls, due to small thermal inertia of the room air, the analyzed room overheats up to 27 °C during the heating period, while it drops to 9 °C when the heating system is off. Also, internal wall heat fluxes from and towards the room are quantified and analyzed for situations when the heating system is on and is off. It is shown that, for massive and thermally insulated buildings, these heat fluxes can be dominant in the room heat exchange.

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Section: Introductionmentioning

confidence: 99%

Transient Effects in Intermittently Heated Buildings-Measurements Versus Calculation

2022

Teh. vjesn.

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“…Renewable energy resources have been employed in buildings with many methods [1], and among them, solar radiation has been harnessed for natural ventilation with solar chimneys [2]- [5]. A typical solar chimney consists of an air channel enclosed by a transparent cover and an absorber surface, such as a building wall [6]- [10]. Once exposed to solar radiation, the transparent cover allows the radiation to pass through and absorb the absorber surface.…”

Section: Introductionmentioning

confidence: 99%

Modifications of Heat Transfer and Induced Flow Rate of a Solar Chimney by an Obstacle in the Air Channel

Nguyen¹,

Huynh²,

Pham³

2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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Using renewable energy resources in buildings has been increasing for saving energy. Among widely used methods, solar chimneys absorb solar radiation and induce an airflow for ventilation, heating, or cooling buildings. The performance of a solar chimney depends on the heat transfer in its air channel, which can be modified by changing the shape of the heat exchange surface. In this study, we examine the effects of a rectangular obstacle placed on the heated surface of the air channel of a solar chimney. A numerical model was built with the Computational Fluid Dynamics (CFD) technique. By changing the geometries of the chimney and of the obstacle, and location of the obstacle, it was found that the obstacle had strong effects on the local flow and heat transfer properties close to the object, particularly the Nusselt number and the temperature field. However, average quantities of the whole air channel flow, such as the averaged Nusselt number and the induced flow rate, were modified insignificantly, except for the temperature rise through the chimney and the thermal efficiency. The change of the flow rate and the average Nusselt number was 5.0% while the temperature rises and the thermal efficiency was up to 13.0%. The height of the obstacle had more influence than the length. This study suggests more investigations to achieve the objective of enhancing the induced flow rate for ventilation of buildings with an obstacle in the air channel of a solar chimney.

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“…At the same time, an increase in the internal temperature of 61% was obtained. In the absence of an occlusive device, the temperatures of the outer surface of the massive wall exceeded 60 °C, and when it was installed, they decreased to 30 °C or below (Briga Sá et al, 2018). Using the life cycle cost (LCC) method, the optimal ratio of the Trombe wall area from a thermal and economic point of view is 37%.…”

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confidence: 99%

Determination of Rational Values of the Parameters of an Unventilated Trombe Wall Using the Method of Multicriteria Optimization for the Climatic Conditions of Uzbekistan

A’zamovich¹

2022

IJSCET

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The energy demands of the construction sector are expected to multiply over the next decade, driven by population growth, rising incomes, accelerating urbanization and changes in consumption patterns. This process is also dramatically affected by the depletion of fossil resources and high specific energy consumption for heating buildings. Under these conditions, it is necessary to develop comprehensive energy efficiency measures in these areas to meet the energy demands of residential, commercial and administrative buildings. In this work, using the methods of degree-day, multicriteria optimization and regression analysis, the optimal combinations of factors for an unventilated Trombe wall are determined: the orientation of the building, the thermal support of the translucent enclosure of the unventilated Trombe wall and the ratio of the surface of the unventilated Trombe wall to the surface of the building facade. The calculations were performed for three levels of thermal protection for buildings in the climatic conditions of the city of Tashkent (Uzbekistan). A typical one-storey three-room house was chosen as the object. As the calculation results show, within the considered range of values, the relative dominances of the factors are as follows: orientation - 5.37%; thermal support of translucent barriers - 72.95%; and area ratio - 21.68%. Using the optimal values, the specific energy consumption of buildings for heating can be reduced from an average of 12.9-14.8% to 52.6-65.3%. Additionally, the CO2 emissions are reduced from 5621.8 kg to 12435.5 kg per year. The discounted payback period, depending on the investment, ranges from 18.7 to 40.9 years. Regression equations are proposed for three levels of thermal protection of the considered object, making it possible to determine the specific energy consumption for heating.

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An analytical approach to assess the influence of the massive wall material, thickness and ventilation system on the Trombe wall thermal performance

Cited by 24 publications

References 28 publications

Transient Effects in Intermittently Heated Buildings-Measurements Versus Calculation

Transient Effects in Intermittently Heated Buildings-Measurements Versus Calculation

Modifications of Heat Transfer and Induced Flow Rate of a Solar Chimney by an Obstacle in the Air Channel

Determination of Rational Values of the Parameters of an Unventilated Trombe Wall Using the Method of Multicriteria Optimization for the Climatic Conditions of Uzbekistan

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