Experimental investigation of the influence of temperature on thermal conductivity of multilayer reflective thermal insulation

Pásztory, Zoltán; Horváth, Tibor; Glass, Samuel V.; Zelinka, Samuel L.

doi:10.1016/j.enbuild.2018.06.012

Cited by 36 publications

(13 citation statements)

References 22 publications

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“…Combined with the weight of the glass plate, spring quantity, length, and force, in summary, the pressure between two contacted glass plates is 1.44 N in hot surroundings (35 °C), while in a cool environment (15 °C), plates are separated with a distance of 1.0 cm between them (Figure d). As for the OFF state, the thermal resistance between the two glass plates is 20 K·W –1 , which is mainly related to the distance of glass plates and air thermal conductivity . While for the ON state, when two plates are contacted, the thermal resistance of SRC is dependent on the contact pressure, surface roughness, thermal conductivity, and hardness of glass, according to the Mikic elastic model .…”

Section: Results and Discussionmentioning

confidence: 99%

“…As for the OFF state, the thermal resistance between the two glass plates is 20 K•W −1 , which is mainly related to the distance of glass plates and air thermal conductivity. 35 While for the ON state, when two plates are contacted, the thermal resistance of SRC is dependent on the contact pressure, surface roughness, thermal conductivity, and hardness of glass, according to the Mikic elastic model. 36 However, for the much lower contact pressure (64 Pa), a considerable calculation error will be induced by the Mikic elastic model.…”

Section: Resultsmentioning

confidence: 99%

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Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Zhang

Huang

Fan

2022

ACS Appl. Energy Mater.

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Maintaining indoor temperature in a suitable range is necessary for modern buildings. Although radiative cooling is efficient for keeping cool in hot weather, it fails to block heat removal in cold weather. Here, we presented a conceptual design of a switchable radiative cooler (SRC) composed of a radiative cooling coating (RCC) and a temperature responsive part (TRP). Relying on the low thermal resistance state in hot weather, the SRC can conduct internal heat to external RCC for dissipation while automatically switching to a high thermal resistance state in chilly weather, inhibiting the indoor heat removal. Theoretically, we revealed that the SRC can achieve remarkable benefit with a temperature drop of 11 K at warm daytime (ON state) and a temperature rise of 4 K at cold nighttime (OFF state) for a designed building model. The results experimentally demonstrated that the SRC can adaptively regulate the radiative cooling performance of the building model and thus keep the interior thermal comfort. This design may open the pathway for developing switchable radiative cooling systems with zero power input.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Zhang

Huang

Fan

2022

ACS Appl. Energy Mater.

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“…Several factors affect the concrete thermal conductivity [55]. For instance, the type of aggregate [56,57], the properties of cementitious materials [58][59][60][61][62][63][64][65][66], moisture content [67,68], design buildup [69][70][71][72][73][74], temperature [75,76], concrete density [12,[77][78][79][80], etc. The measurement of concrete thermal conduction is divided into steady-state and transient methods [81].…”

Section: Thermal Conductivitymentioning

confidence: 99%

Thermal Behavior and Energy Efficiency of Modified Concretes in the Tropical Climate: A Systemic Review

et al. 2021

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Concrete remains the most utilised construction material for building envelopes, which regulate the indoor temperature to achieve human thermal comfort. Often, the energy consumption for building performance appraisal is related to the thermal behaviour of building materials as heating, ventilation, and air conditioning systems all variously contribute to human comfort. Following the development of concrete technology, many types of concrete have been invented to serve several purposes in the construction industry. To clearly understand the concrete type tailored for the specifics of a construction project, the local climate, concrete mechanical properties, and concrete thermal behaviours should be primarily identified to achieve energy efficiency, which also suits the sustainability of global materials. This paper, therefore, reviews the modified concrete thermal behaviours in the tropical climate for more systematic city planning in order to achieve better energy efficiency. Urban heat islands in the tropics and contributing factors, as well as heat transfer mechanisms, are first highlighted. The requirements of concrete thermal behaviour for building envelopes are then discussed through specific heat capacity, thermal conductivity, thermal diffusivity, time lag, and decrement factor in the context of applications and energy consumption in the tropical regions. With a case study, it is found that concrete thermal behaviours directly affect the energy consumption attributed mainly to the use of cooling systems in the tropics. The study can be a reference to mitigating the urban heat island phenomenon in the planning of urban development.

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“…They also compared the U-value of calcarenite, mortar, and plasters against values from literature and standards. Pásztory et al [33] performed measurements of thermal conductivity in multilayer systems intended as reflective insulation. They aimed to find the impact on the thermal conductivity value with the variation of emissivity value of the insulation panel.…”

Section: Measurement Of Thermal Properties In Construction Materialsmentioning

confidence: 99%

Energy and Economic Impact on the Application of Low-Cost Lightweight Materials in Economic Housing Located in Dry Climates

2019

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The building sector is considered a key area for sustainable development, due to the potential to reduce greenhouse gas emissions in the numerous economic activities that this sector involves. A low-cost lightweight cementitious composite consisting in perlite mortar was fabricated and evaluated. The thermal conductivity and heat capacity of the proposed composite were tested in the laboratory. The lightweight composite was integrated into a prototypical house and its thermal performance was tested for two different arid climates during a typical meteorological year. A techno-economic analysis of this integration was carried out, which showed the lightweight system integration could reduce the energy demand up to 10.3% due to the decreased use of heating and cooling systems. The CO2 emissions associated with electricity and gas use on cooling and heating systems could be reduced up to 10.9%.

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Experimental investigation of the influence of temperature on thermal conductivity of multilayer reflective thermal insulation

Cited by 36 publications

References 22 publications

Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Thermal Behavior and Energy Efficiency of Modified Concretes in the Tropical Climate: A Systemic Review

Energy and Economic Impact on the Application of Low-Cost Lightweight Materials in Economic Housing Located in Dry Climates

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