Research on thermal performance and hygrothermal behavior of timber-framed walls with different external insulation layer: Insulation Cork Board and anti-corrosion pine plate

The insulation layer is usually installed in the tunnel structure, whereas the influence of the insulation layer on the thermal behavior of energy tunnel ground heat exchangers (GHEs) is rarely investigated. The model tests were performed in this study to evaluate the heat transfer potential of the energy tunnel with the insulation layer under ventilation and groundwater seepage. The results can be obtained as follows: first, the fluctuations of air temperature and surrounding rock temperature at different locations are relevant to insulation layer, ventilation, and groundwater seepage. Second, the reduction effect of ventilation on the interface temperature of tunnel lining and surrounding rock is alleviated when using an insulation layer, and the interface temperature at upstream section of groundwater seepage is more easily affected by the energy tunnel GHEs. Third, the variation range of ground temperature is wider at the downstream section of groundwater flow. Moreover, the heat exchange rates of tunnel without the insulation layer improve by 5.82% and 6.45% with increasing wind speed at two groundwater flow velocities of 1 × 10 − 4 and 5 × 10 − 4 m/s, and there are only 2.03% and 0.77% enhancements of heat exchange rates by ventilation for the tunnel with the insulation layer. However, the thermal performance of the energy tunnel improved by groundwater is less relevant to the existence of the insulation layer. The relevant findings can provide an effective guidance for the following research and design of the energy tunnel.

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Research and simulation analysis of thermal performance and hygrothermal behavior of timber-framed walls with different external thermal insulation layer: Cork board and anticorrosive pine plate

Journal of Building Physics ◽

10.1177/1744259120936720 ◽

2020 ◽

pp. 174425912093672

Author(s):

Haiyan Fu ◽

Yewei Ding ◽

Minmin Li ◽

Yu Cao ◽

Wenbo Xie ◽

...

Keyword(s):

Thermal Insulation ◽

Thermal Performance ◽

Simulation Analysis ◽

Living Environment ◽

Wall Structure ◽

Cold Winter ◽

Winter Climate ◽

Hygrothermal Behavior ◽

Building Wall ◽

Mold Spore

In order to improve the comfort of the living environment, the thermal performance and temperature–humidity regulation of the exterior walls of two timber-framed structure buildings is theoretically calculated and experimentally studied in this study. Both of the two buildings are located in Nanjing, China, the hot-summer and cold-winter zone. Then WUFI is used to simulate and predict the changes of temperature, relative humidity, and water content of the two timber-framed structure buildings, to strengthen the theoretical analysis of the thermal and humidity coupling of the external walls, and to propose an optimal design scheme for the insulation and temperature and humidity regulation of the external walls. The main results show that the tested thermal conductivity is basically consistent with the predicted value, which prove that WUFI simulation can effectively predict the thermal insulation performance of the external wall. The two timber-framed structure buildings are both suitable for the cold areas, and the reasonable optimization of the design of the structure is the key to the insulation of the building wall. Timber-framed structure is proved to have good temperature–humidity regulation effect. The moisture content of the two timber-framed structure buildings is stable, and the annual temperature and winter humidity are within the appropriate humidity range, which indicates that the wall design is suitable for Nanjing hot-summer and cold-winter climate zone. Four types of wall structure indoor mold spore germinations are less likely, which is not easy to produce the mold. The above research aims to optimize the design of the energy-saving wall of the timber-framed structure and create a comfortable and healthy living environment.

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Effects of external insulation component on thermal performance of a Trombe wall with phase change materials

Solar Energy ◽

10.1016/j.solener.2020.04.010 ◽

2020 ◽

Vol 204 ◽

pp. 115-133 ◽

Cited By ~ 1

Author(s):

Yan Liu ◽

Liqiang Hou ◽

Yidong Yang ◽

Yinping Feng ◽

Liu Yang ◽

...

Keyword(s):

Phase Change ◽

Thermal Performance ◽

Phase Change Materials ◽

External Insulation ◽

Trombe Wall

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Experimental Thermal Performance Assessment of a Prefabricated External Insulation System for Building Retrofitting

Procedia Environmental Sciences ◽

10.1016/j.proenv.2017.03.097 ◽

2017 ◽

Vol 38 ◽

pp. 155-161 ◽

Cited By ~ 8

Author(s):

Roberto Garay ◽

Beñat Arregi ◽

Peru Elguezabal

Keyword(s):

Performance Assessment ◽

Thermal Performance ◽

Insulation System ◽

External Insulation

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Thermal Performance Impacts of Venting EIFS Assemblies

10.32920/ryerson.14645193 ◽

2021 ◽

Author(s):

Khaled H. Khaled

Keyword(s):

Thermal Performance ◽

Percentage Reduction ◽

Insulation Layer ◽

Building Height ◽

Wind Speeds ◽

Maximum Reduction ◽

The Face ◽

Wind Velocities

One of the key improvements in EIFS is the addition of a geometrically defined drainage gap in the continuous insulation layer to allow water that has penetrated the outer EIFS lamina to drain out by gravity to the exterior. The integration of this cavity has raised questions regarding its impact on the thermal performance of wall assemblies constructed with these vented EIFS. The objective of this research is to evaluate the thermal performance impacts, as a percentage reduction in the effective RSI-Value, of a vented EIFS assembly against a face-sealed EIFS and expand the results with respect to increased building height and wind velocities. It can be concluded from the results that a vented EIFS assembly with 2-inches of EPS foam insulation and 4-inches of fiberglass cavity insulation experiences a maximum reduction of 4% in the whole assembly’s effective RSI-value against a face-sealed EIFS assembly. Furthermore, increased wind speeds, caused by installing EIFS at higher elevations from the grade had negligible effects on the thermal resistances of the face-sealed and vented EIFS

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Using natural fibre insulators on green roofs: some considerations

E3S Web of Conferences ◽

10.1051/e3sconf/202019702015 ◽

2020 ◽

Vol 197 ◽

pp. 02015

Author(s):

Kristian Fabbri ◽

Fabrizio Barbieri ◽

Francesca Merli

Keyword(s):

Thermal Performance ◽

Green Roofs ◽

Natural Fibre ◽

Zero Energy ◽

Insulating Material ◽

Zero Energy Building ◽

Synthetic Materials ◽

Hygrothermal Behavior ◽

Coconut Fibre ◽

New Buildings

This study focuses on the application of coconut fibre insulators, an insulating material rarely utilized in the Mediterranean context. Despite its undoubted thermal performance, some queries are related with of his thermo-hygrometric behavior. More precisely, during the use of coconut for covering building for realizing green roofs, which represent a technological solution often adopted in the case of sustainable buildings or nearly zero energy building. Green roofs represent a valid constructive solution with high thermal performances, adopted in existing and new buildings. This paper investigates the thermo-hygrometric behavior of the concrete and Cross Laminated Timbre slabs, insulated with coconut fibreboards (CF) such as an alternative synthetic insulator, referred to a series of different green roofs scenarios. The results show that coconut fibre insulations are equally comparable to natural and synthetic materials. Therefore, coconut fibre could represent a good chance for realization of green roof having high thermal performance and hygrothermal behavior in the same time. This material could be an alternative solution to the normal synthetic materials actually used, in a perspective of sustainable architecture.

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Comparative Analysis of the Use of Thermal Insulation Materials Depending on Climatic Conditions and Comfort Microclimate Supply Systems

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.906.99 ◽

2022 ◽

Vol 906 ◽

pp. 99-106

Author(s):

Siranush Egnatosyan ◽

David Hakobyan ◽

Spartak Sargsyan

Keyword(s):

Energy Efficiency ◽

Comparative Analysis ◽

Thermal Insulation ◽

Thermal Performance ◽

Climatic Conditions ◽

Insulation Material ◽

Insulation Layer ◽

Transfer Resistance ◽

Insulation Materials ◽

Wide Range

The use of thermal insulation materials to reduce the heating and cooling demand of the building in order to provide energy efficiency is the main solution. But there is a wide range of these products on the market and, therefore, the choice and application of these materials is a rather difficult task, since many factors must be taken into account, such as environmental safety, cost, durability, climatic conditions, application technology, etc. Basically, comfort microclimate systems are designed based on normative standards, where the thickness of the thermal insulation material is selected depending on the required heat transfer resistance. These values are calculated taking into account climate conditions, that is the duration of the heating period, as well as taking into account sanitary and hygienic requirements. This article discusses the thermal performance of building materials, and also provides a comparative analysis of the use of thermal insulation materials depending on climatic factors and on the system providing comfort microclimate. Based on the calculations by mathematical modeling and optimization, it is advisable to choose the thickness of the thermal insulation, taking into account the capital and operating costs of the comfort microclimate systems. Comparing the optimization data with the normative one, the energy efficiency of the building increases by 50-70% when applying the optimal thickness of the thermal insulation layer, and when the thermal insulation layer is increased, the thermal performance of the enclosing structures has improved by 30%, which contributes to energy saving.

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