Recent research and development on the use of reflective technology in buildings – A review

Ashhar, Muhamad Zahin Mohd; Haw, Lim Chin

doi:10.1016/j.jobe.2021.103552

Cited by 20 publications

(7 citation statements)

References 46 publications

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“…Figure 1. Working principle of reflective insulation system in a roof system [10] According to Reflective Insulation Manufacturers Association International or RIMA-I, a reflective insulation system is when a reflective foil with a low emissivity characteristic on one or both sides of the foil, is installed adjacent to an air gap. The low emissivity side of the foil (ε = 0.01 -0.05) must be installed adjacent to an air gap for the system to reflect radiant heat transfer effectively as shown in Figure 1.…”

Section: Reflective Insulation Systemmentioning

confidence: 99%

“…However, the opposite effect is observed if the reflective foil is stacked between two solid materials, as the conductive heat transfer will be high. Based on the previous literature, there are various factors affecting the performance of a reflective insulation system as a roof insulation, such as the emissivity value, thickness of the air gap, air gap ventilation, roof pitch, dusting effect, weather, and climatic conditions [10].…”

Section: Reflective Insulation Systemmentioning

confidence: 99%

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Thermal performance of reflective insulation system and comparison against ASHRAE Standard

Ashhar

Haw

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The trend in building energy consumption has been steadily increasing and will continue to rise significantly in the future. The application of a reflective insulation system in roof assembly is proven to be effective in reducing heat gain across the roof and can enhance indoor thermal comfort. This paper presents the development of an Indoor Solar Simulator to evaluate the thermal resistance (RSI value) of reflective insulation systems for roof assemblies. This paper also compares RSI values obtained experimentally and the RSI values listed in ASHRAE Standard. The roof assemblies studied in this paper incorporate the same reflective insulation systems as listed in ASHRAE Standard. Thermocouples and heat flux transducers are installed at various locations and the RSI values are calculated using the average method as detailed in ISO 9869-1:2014. From the error analysis, it can be concluded the RSI values obtained experimentally using the Indoor Solar Simulator and ASHRAE Standard are in a good agreement with MAPE value of 6.13%. These discrepancies could be due to the thermal bridges from mechanical supports inside the air gap, or possibly the air gaps are not completely airtight and unventilated.

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Section: Reflective Insulation Systemmentioning

confidence: 99%

Section: Reflective Insulation Systemmentioning

confidence: 99%

Thermal performance of reflective insulation system and comparison against ASHRAE Standard

Ashhar

Haw

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…An example of the opposite of such a technology could be, for example, UWB technology, which guarantees high accuracy but is still strictly dependent on the user's device [12]. The solution presented here combines the advantages of both previously mentioned technologies while maintaining a relatively low level of control system complexity [13][14][15]. The justification for this approach is to reduce building maintenance costs and increase rational management of energy resources, thus relieving the environment.…”

Section: Introductionmentioning

confidence: 99%

Detection and Determination of User Position Using Radio Tomography with Optimal Energy Consumption of Measuring Devices in Smart Buildings

Styła,

Kozłowski,

Tchórzewski

et al. 2024

Energies

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The main objective of the research presented in the following work was the adaptation of reflection-radar technology in a detection and navigation system using radio-tomographic imaging techniques. As key aspects of this work, the energy optimization of high-frequency transmitters can be considered for use inside buildings while maintaining user safety. The resulting building monitoring and control system using a network of intelligent sensors supported by artificial intelligence algorithms, such as logistic regression or neural networks, should be considered an outcome. This paper discusses the methodology for extracting information from signal echoes and how they were transported and aggregated. The data extracted in this way were used to support user navigation through a building, optimize energy based on presence information, and increase the facility’s overall security level. A band from 5 GHz to 6 GHz was chosen as the carrier frequency of the signals, representing a compromise between energy expenditure, range, and the properties of wave behavior in contact with different types of matter. The system includes proprietary hardware solutions that allow parameters to be adjusted over the entire range and guarantee adaptation for RTI (radio tomography imaging) technology.

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“…Therefore, the use of insulation solutions on roof elements can limit the entry of heat into a building's interior space, thereby reducing the thermal load and, consequently, the demand for refrigeration equipment to provide comfort to occupants. From this perspective, at the structural level, possible solutions to address this issue include the use of green roofs [9][10][11][12], reflective systems [13][14][15], and radiant barrier configurations [16][17][18][19]. Alternatively, at the material level, various thermal insulation materials have been widely developed because they are less restricted by building types.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Indoor Temperature Increments in Summers Using Heat-Flow Sensors to Assess the Impact of Roof Slab Insulation Methods

Teramoto²,

Ohkubo³

et al. 2022

Sustainability

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Improving the thermal insulation performance of buildings is crucial for saving energy. Currently, the insulation performance can be quantified based on the thermal resistance and thermal transmittance (U-value). However, for owners, these data are not readily available for the verification of different insulation methods. To address this, a solution could involve establishing a connection between specialized evaluation indicators and temperature, a common physical quantity. In this study, static and dynamic heat-transfer experiments were performed using an environmental simulation chamber and heat-flow sensors. Based on the tests, a simple predictive formula for the heat-flow density over time was established. After analyzing a full-scale building model, six cases of the heat-flow density versus temperature rise in indoor environments were obtained. This approach may aid owners in visually assessing the insulation performance of buildings by establishing a conversion relationship between the heat-flow density and temperature. In addition, the performance of 14 experimental specimens, including self-developed and code-documented thermal insulation materials and construction methods, was evaluated. In the simulations, after turning off indoor cooling equipment for 6 h during hot summers, the average indoor temperature increase for a roof with insulation was only 52% of that without insulation.

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Recent research and development on the use of reflective technology in buildings – A review

Cited by 20 publications

References 46 publications

Thermal performance of reflective insulation system and comparison against ASHRAE Standard

Thermal performance of reflective insulation system and comparison against ASHRAE Standard

Detection and Determination of User Position Using Radio Tomography with Optimal Energy Consumption of Measuring Devices in Smart Buildings

Estimation of Indoor Temperature Increments in Summers Using Heat-Flow Sensors to Assess the Impact of Roof Slab Insulation Methods

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