An integrated empirical and modeling methodology for analyzing solar reflective roof technologies on commercial buildings

Jo, Jin Ho; Carlson, Joby; Golden, Jay S.; Bryan, Harvey

doi:10.1016/j.buildenv.2009.07.001

Cited by 90 publications

(44 citation statements)

References 11 publications

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“…Indeed, these coatings can largely (18-93%) reduce the cooling load in air-conditioned buildings [114][115][116]. Overall, building energy consumption reduction is less impressive [117], but this technique also provides environmental gain not related to energy, like reduction of air pollution by reduction of the heat island effect [116].…”

Section: Windows and Radiative Thermal Controlmentioning

confidence: 99%

Sustainable Buildings: An Ever Evolving Target

2011

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Environmental considerations have called for new developments in building technologies to bridge the gap between this need for lower impacts on the environment and ever increasing comfort. These developments were generally directed at the reduction of the energy consumption during operations. While this was indeed a mandatory first step, complete environmental life cycle analysis raises new questions. For instance, for a typical low thermal energy consumption building, the embodied energy of construction materials now becomes an important component of the environmental footprint. In addition, the usual practice in life cycle analysis now appears to call for some adaptation-due to variable parameters in time-to be implemented successfully in building analysis. These issues bring new challenges to reach the goal of integrated design, construction, commissioning, operation, maintenance, and decommissioning of sustainable buildings.

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Section: Windows and Radiative Thermal Controlmentioning

confidence: 99%

Sustainable Buildings: An Ever Evolving Target

2011

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“…Heat transfer to the internal space by conduction is therefore reduced; the magnitude of the reduction will be determined by: A number of experimental and computational studies have been carried out to demonstrate the energy benefits of cool roofs in reducing energy demand in buildings in cooling dominated climates. A number of papers have been published for residential buildings [1,2,3,4,5,6], retail stores [7], and other commercial buildings [8,9]. Work has also been carried out outside the US.…”

Section: Introductionmentioning

confidence: 99%

Cool roof technology in London: An experimental and modelling study

Kolokotroni

Gowreesunker

Giridharan

2013

Energy and Buildings

170

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One of the primary reasons for the application of cool materials is their energy and associated environmental impact on the built environment. Cool materials are usually applied on the roof of buildings to reduce cooling energy demand. The relative benefits of this reduction depend on the construction of the building, external weather conditions and use of the building. This paper examines the impact from the application of a reflective paint on a flat roof in a naturally ventilated office building in the area of London, UK where the climate is moderate with high heating demand by buildings.The environmental conditions (internal/external air and surface temperatures) of the building were monitored before and after the application of the cool roof during the summer. It was found that internal temperatures were reduced after the application of the cool roof. The building was modelled using TRNSYS and the model was calibrated successfully using the measurements. A parametric analysis was carried out by varying the reflectivity and insulation of the roof and ventilation rate; the heating and cooling demand for a year was calculated using the Summer Design Year for London as the weather file. It was found that cooling demand is significantly reduced, heating demand is increased and the total energy savings vary between 1 and 8.5% relative to an albedo of 0.1 for the same conditions. In free floating (naturally ventilated) buildings summer comfort is improved but there is a penalty of increased heating energy during the winter. Thermal comfort can be improved by an average of 2.5 o C (operative temperature difference for a change of 0.5 in albedo) but heating demand could be increased by 10% for a ventilation rate of 2 air changes per hour. The results indicate that in the case of temperate climates the type, operation and thermal characteristics of the building should be considered carefully to determine potential benefits of the application of cool roof technology. For the examined case-study, it was found that a roof reflecticity of 0.6-0.7 is the 2 optimum value to achieve energy savings in a cooled office, improve summer internal thermal conditions in a non-cooled office (albeit with some heating energy penalty). It indicates that it is a suitable strategy for refurbishment of existing offices to improve energy efficiency or internal environmental conditions in the summer and should be considered in the design of new offices together with other passive energy efficient strategies.

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“…Different radiation properties on the interior and exterior building surfaces can affect the building thermal performance e.g., cool roofs for exterior surfaces presented in many studies such as (Jo et al 2010;Konopacki and Akbari 2001;Wray and Akbari 2008), near-infrared (NIR) reflective pigments (Miller et al 2004;Levinson, Akbari, and Reilly 2007;Song et al 2014), mitigation of heat island effect by applying cool roof materials (Santamouris et al 2012;Synnefa et al 2011;Santamouris 2014;Rossi et al 2015), indoor climate and temperature distribution (Daoud, Galanis, and Bellache 2008;Azemati et al 2013) and reflective barrier for air space and attics (Baldinelli 2010;Saber 2012;Miranville et al 2012;Belusko, Bruno, and Saman 2011).…”

Section: Motivation For This Studymentioning

confidence: 99%

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

Joudi¹

2015

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Recent studies have shown that the optical properties of building exterior surfaces are important in terms of energy use and thermal comfort. While the majority of the studies are related to exterior surfaces, the radiation properties of interior surfaces are less thoroughly investigated. Development in the coil-coating industries has now made it possible to allocate different optical properties for both exterior and interior surfaces of steel-clad buildings. The aim of this thesis is to investigate the influence of surface radiation properties with the focus on the thermal emittance of the interior surfaces, the modeling approaches and their consequences in the context of the building energy performance and indoor thermal environment.The study consists of both numerical and experimental investigations. The experimental investigations include parallel field measurements on three similar test cabins with different interior and exterior surface radiation properties in Borlänge, Sweden, and two ice rink arenas with normal and low emissive ceiling in Luleå, Sweden. The numerical methods include comparative simulations by the use of dynamic heat flux models, Building Energy Simulation (BES), Computational Fluid Dynamics (CFD) and a coupled model for BES and CFD. Several parametric studies and thermal performance analyses were carried out in combination with the different numerical methods.The parallel field measurements on the test cabins include the air, surface and radiation temperatures and energy use during passive and active (heating and cooling) measurements. Both measurement and comparative simulation results indicate an improvement in the indoor thermal environment when the interior surfaces have low emittance. In the ice rink arenas, surface and radiation temperature measurements indicate a considerable reduction in the ceiling-to-ice radiation by the use of low emittance surfaces, in agreement with a ceiling-to-ice radiation model using schematic dynamic heat flux calculations.The measurements in the test cabins indicate that the use of low emittance surfaces can increase the vertical indoor air temperature gradients depending on the time of day and outdoor conditions. This is ii in agreement with the transient CFD simulations having the boundary condition assigned on the exterior surfaces. The sensitivity analyses have been performed under different outdoor conditions and surface thermal radiation properties. The spatially resolved simulations indicate an increase in the air and surface temperature gradients by the use of low emittance coatings. This can allow for lower air temperature at the occupied zone during the summer.The combined effect of interior and exterior reflective coatings in terms of energy use has been investigated by the use of building energy simulation for different climates and internal heat loads. The results indicate possible energy savings by the smart choice of optical properties on interior and exterior surfaces of the building.Overall, it is concluded that the interior re...

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An integrated empirical and modeling methodology for analyzing solar reflective roof technologies on commercial buildings

Cited by 90 publications

References 11 publications

Sustainable Buildings: An Ever Evolving Target

Sustainable Buildings: An Ever Evolving Target

Cool roof technology in London: An experimental and modelling study

Radiation properties of coil-coated steel in building envelope surfaces and the influence on building thermal performance

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