Optimizing Windowpane Performance in Terms of Solar Radiation and Thermal Conductivity for Balancing Lighting and Thermal Models in Architectural Spaces (original) (raw)
Related papers
2016
As part of sustainable architecture principles and practices, designers need to define building's architectural requirements based on climatic conditions, environmental preservation and reduction in energy consumption. The natural energy sources such as solar radiation affect thermal and lighting performances of buildings depending on its facade characteristics. Traditionally, buildings thermal and lighting analyses are employed independently. As non-linear relationships are often disclosed, an integrated thermal and lighting approach is necessary to optimize the façade configuration. This paper presents an integrated model of thermal and lighting energy simulation which investigates 1650 window configurations, and sunshade size in a residential building in a mild climate to find the optimum solution. The integrated thermal and daylight simulations are carried out using Energy PlusV8-1-0, Daysim 1.08 and Radiance 2.01 software. Calculations are performed on hourly basis for an e...
Integrating Thermal and Lighting Analysis to Optimize Window Size of Educational Buildings
2015
Designing buildings with the lowest possible cost base is an essentiality in sustainable architecture. Previously, due to the computational complexity of building's energy consumption, the environmental impact on thermal and lighting energy consumptions haven't been considered simultaneously. As nonlinear relationships are often disclosed, a comprehensive approach is necessary to reduce the total energy need of a building and optimize the facade configuration at the same time. Solar radiation affects thermal and lighting energy consumption which depends on building fabric’s characteristics. In this paper a parametric method to optimize the window size and sunshade dimensions of an educational building in mild climate of Iran is presented. Through integrating thermal and lighting energy consumption, 6750 window and sunshade configurations are studied and compared. First, climatic parameters and thermal analysis are validated by on-site measurements. Then, the characteristics ...
EFFECTS OF WINDOW SIZE IN DAYLIGHTING AND ENERGY PERFORMANCE IN BUILDINGS
ABSTRACT The design of buildings is a complex process in which decisions are taken during the design stage that critically affect the habitability and energy performance. In this sense, large window areas allow more daylight into a space, but they may also allow excessive heat gains or losses which increase the air-conditioning cooling or heating load, and the energy consumption.
Cooling Demand in Commercial Buildings -The Influence of Daylight Window Design
Abstrac t-The objective of the paper is to show how window design could influence the peak cooling load, daylight availability and direct sun penetration for a south facing office room in North European circumstances latitude about 59 ~ 60°. A daylight window is compared with an ordinary window to find out the design consequence differences. Both size and cost of the HVAC system needed to avoid unacceptably high room temperatures in office buildings depend on the peak load. In office rooms with windows this peak load is usually decided by the solar irradiation. Therewith the architectural design is decisive for the HVAC solutions needed. The Seattle Daylighting Lab heliodon table has been used to analyze daylight window potential in North European circumstances in decreasing the peak cooling load and glare from direct sun by blocking the direct solar rays from entering the room. Finally, outgoing from simulations, daylight and solar tests, the possible combination of window glass sh...
Optimization of Window Design for Daylight and Thermal Comfort in Cold Climate Conditions
Energies
Window design affects the overall performance of a building. It is important to include window design during the initial stages of a project since it influences the performance of daylight and thermal comfort as well as the energy demand for heating and cooling. The Norwegian building code facilitates two alternative methods for achieving a sufficient daylight, and only guidelines for adequate indoor thermal comfort. In this study, a typical Norwegian residential building was modeled to investigate whether the criteria and methods facilitate consistent and good performance through different scenario changes and furthermore, how the national regulations compare to European standards. A better insulated and more air-tight building has usually a lower annual heating demand, with only a marginal decrease in the daylight performance when the window design is unchanged. A more air-tight construction increases the risk of overheating, even in cold climates. This study confirms that a revis...
Experimental Analysis of Cool Traditional Solar Shading Systems for Residential Buildings
Energies, 2015
In recent years there has been a growing interest in the development and thermal-energy analysis of passive solutions for reducing building cooling needs and thus improving indoor thermal comfort conditions. In this view, several studies were carried out about cool roofs and cool coatings, producing acknowledged mitigation effects on urban heat island phenomenon. The purpose of this work is to investigate the thermal-energy performance of cool louvers of shutters, usually installed in residential buildings, compared to dark color traditional shading systems. To this aim, two full-scale prototype buildings were continuously monitored under summer conditions and the role of the cool shutter in reducing the overheating of the shading system and the energy requirements for cooling was analyzed. After an in-lab optical analysis of the cool coating, showing a huge solar reflectance increase with respect to the traditional configuration, i.e., by about 75%, field monitoring results showed that the cool shutter is able to decrease the indoor air temperature up to 2 °C under free floating conditions. The corresponding energy saving was about 25%, with even much higher peaks during very hot summer conditions. -room; indoor microclimate; energy efficiency in buildings Internal heat capacity: 128.8 kJ/m 2 · K Brickwork, outer leaf: 0.12 m Plasterboard: 0.01 m EPS insulation: 0.09 m Brickwork, inner leaf: 0.25 m Gypsum plastering: 0.02 m Roof Thermal transmittance: 0.24 W/m 2 · K Internal heat capacity: 50.7 kJ/m 2 · K Clay tile: 0.015 m Mineral wool insulation: 0.015 m Air gap: 0.05 m Mineral wool insulation: 0.08 m Aerated concrete slab: 0.20 m Gypsum plastering: 0.015 m Test-room 2 Opaque wall Thermal ransmittance: 0.28 W/m 2 · K Internal heat capacity: 128.8 kJ/m 2 · K Bitumen sheet: 0.01 m Mineral wool insulation: 0.10 m Aerated concrete slab: 0.20 m Gypsum plastering: 0.015 m Roof Thermal transmittance: 0.24 W/m 2 · K Internal heat capacity: 50.7 kJ/m 2 · K Plaster dense: 0.02 m EPS insulation: 0.09 m Brickwork, inner leaf: 0.30 m Gypsum plastering: 0.02 m Both the test-rooms Ground floor Transmittance: 0.30 W/m 2 · K Internal heat capacity: 200 kJ/m 2 · K Linoleum: 0.004 m Glass fiber slab: 0.10 m Cast concrete: 0.30 m Both the test-rooms Glazing systems Solar heat gain coefficient g (%): 42 Thermal transmittance U (W/m 2 · K): 1.3
E3S Web of Conferences, 2021
In the context of shrinking non-renewable energy resources and reducing greenhouse gas emissions, it turns out necessary to drop energy consumption and move towards renewable energy sources. In this regard, solar energy being an abundant source of energy, it can play an important role in the building energy supply. This energy supplement can come from passive solar technologies, of which the Trombe wall is one of the passive models most used in the building envelope, whose main role is to ensure net gains. Thereby, the main aim of this study is to highlight the use of a simple method to reduce the buildings heating demand. For this, a 3-D model was developed through scSTREAM V2020 software to investigate the thermal performance of a classical Trombe wall in winter while targeting desirable indoor thermal comfort conditions. In addition, studies have been performed to optimize the energy consumption It turned out that, in the presence (respectively absence) of solar irradiation, the ...
External Sun shading strategy provide an opportunity for the architect to control natural lighting, ventilation, and solar gain, all of which provide a benefit to the overall building performance. The intensity of solar radiation on a building façade called for the use of strategies that will intercept its devastating effect before reaching the interior of the building. Due to some challenges encountered by some exterior shading devices, recessed window is confirmed to be one of the best form of shading as it is a form of self-shaded strategies. As the building's biggest heat directing surface, the façade which housed window has the greatest influence in minimizing the building's energy utilization. It is on this premise that this framework aimed at assessing the potentials of recessed window façade for heat gain reduction in the tropical buildings. The methodology used in this study focuses on an intensive review of previous studies and literatures. The paper verified from previous studies that the use of recessed window façade is preferred to other forms of external shading devices because of the problem of thermal bridges, thermal mass, e.t.c encouraged by most shading devices. It also finds out that, the dimensionless " depth " to which the window is recessed, R = r / L and is a very crucial formula amongst orders that determine the heat transfer rate in recessed window shadings.
JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT, 2014
Modern office building designs tend to increase the window share per facade to make the building more impressive with extensive visibility and well daylit rooms. In general, an increased window share results in higher energy usage and higher costs of heating and cooling, but these disadvantages can be reduced with a more careful design. The aim of this paper is to show the influence of window design and room layout on heating and cooling demand and daylight availability in office buildings in northern Europe. The results in the paper are based on design calculations for two different room types and daylight measurements on two room scale models in a daylight laboratory. The calculations show the influence of window design parameters on the cooling and heating demand. The daylight measurements show the influence of window design parameters on the availability of daylight. The results have then been combined to show a feasible window design regarding daylight availability and the resu...