Reflective coatings for interior and exterior of buildings and improving thermal performance

Joudi, Ali; Svedung, Harald; Cehlin, Mathias; Rönnelid, Mats

doi:10.1016/j.apenergy.2012.10.019

Cited by 78 publications

(40 citation statements)

References 12 publications

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“…Although such simulation tools are useful for estimating annual energy use (Joudi et al 2013), the lack of spatial resolution in such models makes it inappropriate to address spatially resolved phenomena such as temperature gradients.…”

Section: Computational Fluid Dynamicsmentioning

confidence: 99%

“…The transient boundary conditions were assigned in ANSYS FLUENT for numerical solution. For more information, see (Joudi et al 2013). …”

Section: Mesh Strategymentioning

confidence: 99%

“…The test cabins have been studied under different scenarios as presented by (Joudi et al 2013). In this sensitivity analysis, windows and doors are omitted and operative temperature is set to 20±1C where the ideal heater and cooler were employed.…”

Section: Building Energy Simulationmentioning

confidence: 99%

“…The cases include the interaction of reflective interior cabin with difference in internal load and the compound effect of reflective interior and exterior surfaces. Simulations are performed on a building example with the scale 3 times the original size of the cabins with the same interior surface ratio and U-values and internal load of 40 Wm ─2 and 1.5 air change per hour ventilation based on the work presented in (Joudi et al 2013). …”

Section: Building Energy Simulationmentioning

confidence: 99%

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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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Section: Computational Fluid Dynamicsmentioning

confidence: 99%

“…The transient boundary conditions were assigned in ANSYS FLUENT for numerical solution. For more information, see (Joudi et al 2013). …”

Section: Mesh Strategymentioning

confidence: 99%

Section: Building Energy Simulationmentioning

confidence: 99%

Section: Building Energy Simulationmentioning

confidence: 99%

See 2 more Smart Citations

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

Joudi¹

2015

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“…Many building rating systems (BRS) have been designed and implemented for building engineers and building managers to assess building energy performance [3,21,32]. The Building Research Establishment Environmental Assessment Method (BREEAM) [13] and Leadership in Energy and Environmental Design (LEED) [9] are the two most widely-recognized building energy performance assessment methodologies and are used globally in buildings and construction industries [26].…”

Section: Introductionmentioning

confidence: 99%

Assessing Chinese campus building energy performance using fuzzy analytic network approach

Liu

Tang

et al. 2015

IFS

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Abstract. Buildings were responsible for over 30% of total Chinese energy consumption in 2010. With a wild range of climate conditions and a separate air conditioning structure in campus buildings, it is significant but difficult to assess the energy performance of campus buildings in China. This paper proposes a novel mechanism to assess energy performance of campus buildings, using a fuzzy analytic network process (FANP). Six criteria are used as key performance indicators based on climate conditions in China and the air conditioning device deployment structure in campus buildings: 1) building envelope; 2) renewable energy; 3) illumination; 4) thermal comfort; 5) window and door; and 6) occupation status. A simulation is presented to illustrate the effectiveness of the proposed approach, analyzing three different rooms in the International School of Software, at Wuhan University. Assessment results are discussed in terms of optimizing future energy performance of campus buildings.

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Fluid‐Integrated Glass–Glass Laminate for Sustainable Hydronic Cooling and Indoor Air Conditioning

Heiz

Pan

et al. 2018

Advanced Sustainable Systems

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improving the energy efficiency of a building is to minimize the heat exchange at the building interface. This is presently achieved through improvements on the building envelope, and facilitated through various material innovations, e.g., efficient thermal insulation materials, [11][12][13] emission-control coatings and surface layers, [14][15][16] or passive cooling systems which target enhancing the albedo of the urban environment, implemented either on the roof [17][18][19][20] or in façades. [21][22][23] Furthermore, active systems which adapt to environmental conditions are also studied, for example, chromogenics, [24][25][26][27][28][29][30] suspended particle devices, [29,31,32] liquid crystal devices, [29,31,[33][34][35] or evaporative or transpiration coolers. [36] Besides building envelopes, indoor cooling and air-conditioning systems represent a second area of major interest. This involves primarily the compensation of thermal load (originating from solar input as well as from electronic appliances, lighting, or human activity). Currently, the evacuation of latent and sensible heat is achieved using air-based cooling systems connected to chillers which operate with a fluid temperature of around 7-12 °C [37] and reach a seasonal performance factor of around 4. However, those systems are often conceived as being uncomfortable because of strong chill, convection, vertical gradients in air temperature, and noise. [38,39] Hydronic cooling systems for integration with building components (e.g., ceilings, walls, floors) are hence proposed as serious alternatives, enabling improvements on indoor comfort at significantly reduced energy consumption. [40][41][42][43] In this context, we now present a new type of hydronic system for sustainable cooling of indoor spaces and individual zones. Making use of visually transparent, large-area fluidic panels for wall, ceiling, and window integration, [44][45][46] we avoid negative effects such as draught or noise emitted by conventional air-conditioning systems which circulate cold and dry air. To facilitate significant reductions on energy consumption, the present system operates at very low flow rates and strongly reduced temperature gradients.As depicted in Figure 1, the device relies on cold water circulating through densely packed channels within a glassglass laminate such as recently reported for large-area integration with adaptive facades [44,47] or flat-panel algae reactors. [48] Adapted cooling performance is achieved by controlling the temperature and the flow rate of the circulating fluid, with More than 20% of the global energy demands are caused by heating, ventilating, and air conditioning in buildings. In particular during summer seasons and in warm climates, cooling loads are mostly neutralized by conventional air-conditioning systems. Due to often very low primary temperature, these require high energy input, cause significant noise, uncomfortably cool draughts, and vertical air temperature gradients. Here, an energy efficient planar cooling device for...

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Reflective coatings for interior and exterior of buildings and improving thermal performance

Cited by 78 publications

References 12 publications

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

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

Assessing Chinese campus building energy performance using fuzzy analytic network approach

Fluid‐Integrated Glass–Glass Laminate for Sustainable Hydronic Cooling and Indoor Air Conditioning

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