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

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.

scholarly journals The Effects of Courtyards on the Thermal Performance of a Vernacular House in a Hot-Summer and Cold-Winter Climate

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1042 ◽  
Author(s):  
Shimeng Hao ◽  
Changming Yu ◽  
Yuejia Xu ◽  
Yehao Song
Keyword(s):  
Solar Radiation ◽  
Thermal Performance ◽  
Natural Ventilation ◽  
Field Measurements ◽  
Ground Level ◽  
Active Role ◽  
Thermal Mass ◽  
Cold Winter ◽  
Winter Climate ◽  
Climate Zones

Achieving comfort in hot summer and cold winter (HSCW) climate zones can be challenging, since the climate is characterized by high temperatures in the summer and relatively colder temperatures in the winter. Courtyards, along with other semi-open spaces such as verandas and overhangs, play an important role in mitigating outdoor climate fluctuations. In this research, the effects of courtyards on the thermal performance of vernacular houses in HSCW climate zones were studied via field measurements and computational fluid dynamics (CFD) models. The selected courtyard house was a representative vernacular timber dwelling situated in the southeast of Chongqing, China. The indoor and outdoor air temperature measurements revealed that the courtyard did play an active role as a climatic buffer and significantly reduced the temperature’s peak value in the summer, while during the winter, the courtyard prevented the surrounding rooms from receiving direct solar radiation, and thus to some extent acted as a heat barrier. The contributions of thermal mass are quite limited in this area, due to insufficient solar radiation in winter and general building operations. The natural ventilation mechanism of courtyard houses in HSCW zones was further studied through CFD simulations. The selected opened courtyard was compared to an enclosed structure with similar building configurations. The airflow patterns driven by wind and buoyancy effects were first simulated separately, and then together, to illustrate the ventilation mechanisms. The simulation results show that the courtyard’s natural ventilation behavior benefited from the proper openings on ground level.

scholarly journals Determining Thermal Specifications for Vegetated GREEN Roofs in Moderate Winter Climates

2015 ◽  
Vol 9 (13) ◽  
pp. 208
Author(s):  
Christoph Maria Ravesloot
Keyword(s):  
Thermal Insulation ◽  
Thermal Performance ◽  
Energy Use ◽  
Green Roof ◽  
Green Roofs ◽  
Physical Parameters ◽  
Winter Climate ◽  
Theoretical Contribution ◽  
Winter Conditions ◽  
U Value

<p class="zhengwen">Because local weather conditions in moderate climates are changing constantly, heat transfer specifications of substrate and vegetation in vegetated green roofs also change accordingly. Nevertheless, it is assumed that vegetated green roofs can have a positive effect on the thermal performance of construction in winter conditions. Is there proof from scientific research and field testing for this assumption? To answer this question, research is conducted with the main research question: Which parameters defining thermal performance for vegetated green-roof construction for a moderate winter climate like that in the Netherlands can be determined from existing literature, and how do these parameters influence thermal performance? Literature research was executed on monitoring and testing of thermal specifications of vegetated green roofs. Models with physical parameters on vegetated green roofs were studied and compared. The first goal was to make a list of all physical parameters and corresponding variables valid in the Dutch moderate-winter climate. None of the models that were found in the literature seemed to cover all physical processes. These models use parameters and variables to calculate the overall u-value of substrate and vegetation. Nevertheless, one nearly complete model was used for a sensitivity test on variables. Maximum and minimum values of variables were calculated in the model to determine the influence on the outcome in terms of u-value. From this analysis, a distinction could be made between variables influencing the u-value strongly and other variables influencing the outcome weakly.</p><p class="zhengwen">The modelling showed that three variables were influencing the model calculations moderately strongly and therefore the thermal performance of the vegetated green-roof substrate and vegetation. These variables are not consistent with parameters modeling or calculating u-value in constructions. This finding means that contribution to thermal insulation by extensive vegetated green-roof substrate and vegetation in terms of u-value would be negligible. Only a small theoretical contribution to thermal insulation can be argued from weak variables. To be sure about this small theoretical contribution to the u-value of the roof construction, this u-value was used as input for energy-use calculations for residential buildings. These calculations show that such a small increase of the u-value leads to no visible reduction in energy use for heating in winter conditions. The contribution is negligible compared to the influence of the u-value from extra insulation under the roof.</p>For vegetated green roofs in such moderate winter climates as in the Netherlands, additional u-value will have to be proven specifically, because the modelling shows that, in general, no contribution to thermal insulation can be expected.

Analysis of Thermal Performance of a New Regenerated Glass Pumice External Wall Insulation System in Hot Summer and Cold Winter Zone

2013 ◽  
Vol 671-674 ◽  
pp. 1791-1795
Author(s):  
Qian Gu ◽  
Sheng Ren ◽  
Yue Wang ◽  
Hao Luo
Keyword(s):  
Thermal Insulation ◽  
Thermal Performance ◽  
Insulation Material ◽  
Cold Winter ◽  
Insulation System ◽  
External Wall ◽  
Finite Element Software ◽  
Building Walls ◽  
Insulation Performance ◽  
The Heat Transfer Coefficient

The thermal performance of a new regenerated glass pumice board as external wall thermal insulation material was analyzed in this paper. Considering the roles of solar radiation and air convection, and selecting Wuhan city as an example of the hot summer and cold winter zones, the temperature field distributions of the external building walls in different orientations in summer and winter seasons were numerically simulated by using the finite element software ANSYS. The thermal performance of regenerated glass pumice exterior wall external insulation system including the heat transfer coefficient and the temperature distribution was evaluated. The simulation results demonstrate the good thermal insulation performance of the regenerated glass pumice as a new kind of external wall materials, and the feasibility of the application of this environmentally friendly material to the wall insulation system in energy conservation building is also promoted.

Research on the Thermal Performance of New Sandwich Insulation Composite Wall Panel

2012 ◽  
Vol 567 ◽  
pp. 220-223 ◽  
Author(s):  
Shan Xia ◽  
Guang Hui Xia ◽  
Jian Hua Cui ◽  
Wan Yun Yin
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Insulation Material ◽  
Cold Winter ◽  
Wall Panel ◽  
Design Standards ◽  
Practical Engineering ◽  
New Type ◽  
Composite Wall

Based on the energy saving design standards in hot summer and cold winter zone like Anhui province, a new type of sandwich insulation composite wall panel is researched, Influence on thermal performances of new sandwich insulation composite wall panel，due to in different thermal insulation material, different content of the oblique connection rebar, different thermal insulation layer thickness and different internal and external wall thickness, are analyzed. The results show that, in not take extra insulation measures, this kind of sandwich insulation composite wall panel thermal performance can meet the hot summer and cold winter area energy-saving design standard requirements. Research results and practical engineering contact tightly, It has a comparatively high practical value.

scholarly journals Thermal performance evaluation of a passive building wall with CO2-filled transparent thermal insulation and paraffin-based PCM

Solar Energy ◽  
2020 ◽  
Vol 205 ◽  
pp. 1-11
Author(s):  
Agustín Torres-Rodríguez ◽  
David Morillón-Gálvez ◽  
Daniel Aldama-Ávalos ◽  
Víctor Hugo Hernández-Gómez ◽  
Iván García Kerdan
Keyword(s):  
Performance Evaluation ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Building Wall

Numerical Study on Energy Consumption Characteristics for Wall Insulation Structure in Hot Summer and Cold Winter Zone

2013 ◽  
Vol 361-363 ◽  
pp. 300-306 ◽  
Author(s):  
Min Li Wu ◽  
Xiao Qian Qian ◽  
Yao Tai Zhu
Keyword(s):  
Heat Flux ◽  
Energy Consumption ◽  
Energy Saving ◽  
Dynamic Simulation ◽  
Thermal Insulation ◽  
Simulation Analysis ◽  
Outdoor Environment ◽  
Saving Rate ◽  
Cold Winter ◽  
Environment Temperature

In this paper the software DeST was adopted as simulation tool for hourly dynamic simulation analysis for the summer cooling energy consumption of different interior and outer structure systems. Then the software Fluent was adopted for dynamic simulation analysis by seconds for the enclosure structures surface temperature and heat flow within 10~14 days. The results show that in hot summer and cold winter zone the energy-saving rate is less than 5% when only outer wall is in exterior insulation and intermittent use energy characteristics, but if the outer and interior walls are all in the external thermal insulation, the energy-saving rate will be greatly improved; Under the condition of unsteady, wall temperature fluctuation is far less than the outdoor environment temperature and the range of maximum and minimum temperature is only 2 ~ 3 °C,besides the range will be smaller only to 0.5 °C or so if using external thermal insulation; Finally the air conditioning energy consumption differences with Different retaining structures mainly reflected as the size of heat flux on the interior surface of the wall. Base on the intermittent and loculose energy use characteristics in hot summer and cold winter zone the heat flux dissipated on interior wall are the main part.

The Domestic Research Situation of Crop Straws as Building Wall Materials and Thermal Insulation Materials

2016 ◽  
Vol 723 ◽  
pp. 711-715
Author(s):  
De Feng Xu ◽  
Sheng Nan Tao ◽  
Li Mei Chen ◽  
Shu Chao Cheng ◽  
Fei Xiao ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Jilin Province ◽  
Comprehensive Utilization ◽  
Insulation Materials ◽  
Industrial Utilization ◽  
Building Wall ◽  
Wall Materials ◽  
Research Situation

At present, the comprehensive utilization of crop straws exist the problem of the lower industrial utilization in Jilin Province, China. It’s well-known that the industrial conversion of crop straws are often used as the building wall materials and thermal insulation materials in our country. According to the above two questions, this paper elaborates the domestic research situation of crop straws that serve as building wall materials and thermal insulation materials, and summarizes the fabrication process, mechanical property and thermal performance of the crop straws as building wall materials and thermal insulation materials. Finally, the article puts forward three key problems of crop straws, which are used as the building wall materials and thermal insulation materials. I hope that this paper can provide valuable reference for speeding up the comprehensive utilization of crop straws in Jilin Province.

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