scholarly journals Optimization of Coupled Building Roof Solar Reflectance and Thermal Insulation Level for Annual Energy Saving Under Different Climate Zones

2017 ◽  
Author(s):  
Cristina Piselli ◽  
Anna Laura Pisello ◽  
Alvaro de Gracia ◽  
Mohammad Saffari ◽  
Franco Cotana ◽  
...  
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Climate Zones ◽  
Building Roof ◽  
Solar Reflectance

Summary on the Evaluation Indicator for Thermal Insulation Performance of Reflective Thermal Insulation Coatings

2014 ◽  
Vol 584-586 ◽  
pp. 1798-1801
Author(s):  
Meng Ping Feng ◽  
Xiao Qian Qian ◽  
Yao Tai Zhu
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Evaluation Method ◽  
Thermal Inertia ◽  
Existing Problems ◽  
Evaluation Indicator ◽  
Solar Reflectance ◽  
Saving Effect ◽  
Energy Efficient Building ◽  
Insulation Performance

Reflective thermal insulation coatings (RTIc) are applied widely in Hot Summer and Cold Winter Zone and in Hot Summer and Warm Winter Zone. A feasible evaluation method for energy saving effect is very important for acceptance of energy efficient building construction. Combining with the research on RTIc at home and aboard, series of evaluation indicators of thermal insulation performance and energy saving effect of RTIc such as solar reflectance, hemispherical emittance, temperature, thermal resistance, energy efficiency and thermal inertia were summarized and the existing problems and several suggestions were also proposed.

scholarly journals Energy performance assessment and optimization of extensive green roofs in different climate zones of China

2020 ◽  
Vol 172 ◽  
pp. 16003
Author(s):  
Jiandong Ran ◽  
Zhenjing Yang ◽  
Ya Feng ◽  
Ke Xiong ◽  
Mingfang Tang
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Green Roof ◽  
Green Roofs ◽  
Saving Rate ◽  
Area Index ◽  
Climate Zones ◽  
Extensive Green Roofs

There are many research and engineering projects on extensive green roofs, however, there is still no design guide for green roofs` climate energy efficiency, which limits the further promotion and usage of it, especially in China containing five climate zones. Taking different climate zones of China as examples, the verified building model is used in the DesignBuilder software, and 2-4 typical cities in each climate zone are selected, then combined the genetic algorithm (GA-Ⅱ) to optimize the energy efficiency of the building under green roofs. The results show that in all the cities studied in the five climatic zones, extensive green roofs are more energy efficient than ordinary thermal insulation roofs, and the energy saving rate is between 1-26.4%; except for the Nenjiang, which the energy is mainly used for heating, the cooling energy consumption is reduced and the heating energy consumption is increased after the optimized green roof is adopted in other cities; it is also found that the energy saving rate of the green roof with optimization has a high correlation with the total annual solar radiation value of the city. In addition, the energy efficiency optimization of green roofs in all cities shows that a larger leaf area index is more conducive to energy conservation; however, in southern China, it is not recommended to use a thermal insulation layer in the roof structural layer below the soil.

scholarly journals Energy Saving Quantitative Analysis of Passive, Active, and Renewable Technologies in Different Climate Zones

2021 ◽  
Vol 11 (15) ◽  
pp. 7115
Author(s):  
Chul-Ho Kim ◽  
Min-Kyeong Park ◽  
Won-Hee Kang
Keyword(s):  
Renewable Energy ◽  
Energy Consumption ◽  
Energy Saving ◽  
High Performance ◽  
Energy Systems ◽  
Outdoor Air ◽  
Climate Zones ◽  
Renewable Energy Systems ◽  
Active Systems ◽  
High Performance Buildings

The purpose of this study was to provide a guideline for the selection of technologies suitable for ASHRAE international climate zones when designing high-performance buildings. In this study, high-performance technologies were grouped as passive, active, and renewable energy systems. Energy saving technologies comprising 15 cases were categorized into passive, active, and renewable energy systems. EnergyPlus v9.5.0 was used to analyze the contribution of each technology in reducing the primary energy consumption. The energy consumption of each system was analyzed in different climates (Incheon, New Delhi, Minneapolis, Berlin), and the detailed contributions to saving energy were evaluated. Even when the same technology is applied, the energy saving rate differs according to the climatic characteristics. Shading systems are passive systems that are more effective in hot regions. In addition, the variable air volume (VAV) system, combined VAV–energy recovery ventilation (ERV), and combined VAV–underfloor air distribution (UFAD) are active systems that can convert hot and humid outdoor temperatures to create comfortable indoor environments. In cold and cool regions, passive systems that prevent heat loss, such as high-R insulation walls and windows, are effective. Active systems that utilize outdoor air or ventilation include the combined VAV-economizer, the active chilled beam with dedicated outdoor air system (DOAS), and the combined VAV-ERV. For renewable energy systems, the ground source heat pump (GSHP) is more effective. Selecting energy saving technologies that are suitable for the surrounding environment, and selecting design strategies that are appropriate for a given climate, are very important for the design of high-performance buildings globally.

Study on the Thermal Performance of the Vernacular Dwellings in Wei-He Plain of Shaanxi Province

2012 ◽  
Vol 476-478 ◽  
pp. 1589-1595
Author(s):  
Yi Ping Zhu ◽  
Xi Liao ◽  
Shu Yun Wu ◽  
Jing Luo ◽  
Yuan Jiang ◽  
...  
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Thermal Performance ◽  
Thermal Environment ◽  
Local Area ◽  
Shaanxi Province ◽  
Indoor Thermal Environment ◽  
Questionnaire Surveys

Based on indoor thermal environment test and questionnaire surveys, the paper studies on thermal insulation capacity and indoor thermal environment of the vernacular dwellings in Wei-he Plain of Shaanxi Province, China, and analyses their heating methods and application status. Besides, the popularity of sustainable techniques in local area has been evaluated and summarized. Moreover, the paper discusses the present problems in local indoor thermal environment and energy-saving status.

scholarly journals Influence of Solar Reflectance and Renewable Energies on Residential Heating and Cooling Demand in Sustainable Architecture: A Case Study in Different Climate Zones in Spain Considering Their Urban Contexts

2019 ◽  
Vol 11 (23) ◽  
pp. 6782 ◽  
Author(s):  
Maria-Mar Fernandez-Antolin ◽  
José-Manuel del-Río ◽  
Roberto-Alonso Gonzalez-Lezcano
Keyword(s):  
Renewable Energy ◽  
Architectural Design ◽  
Research Work ◽  
Cold Climate ◽  
Large Temperature ◽  
Winter Period ◽  
Climate Zones ◽  
Solar Reflectance ◽  
Hot Climate ◽  
Urban Contexts

In this research work, energy simulation was used as a forecasting tool in architectural design. It includes the study of a multi-family residential building in five different climate zones of Spain, i.e., A4 (very hot climate zones), B4 (hot climate zones), C4 (moderate climate zones), D3 (cold climate zones), and E1 (very cold climate zones). The authors accomplished a sensitivity analysis in order to identify the influence of passive strategies (i.e., with regard to solar reflectance) and renewable energy (i.e., with regard to aerothermal energy) on indoor temperatures and energy demands. The increment in indoor temperatures depends on the neighboring buildings so that effect of urban contexts as a source of protection against sunlight is also considered. The increment in the albedo (i.e., the solar reflectance) of the façade during the winter period produces little differences in indoor operative temperatures. On the contrary, during the summer period, it produces large temperature differences. Therefore, it is shown that colors significantly reduce temperatures from 1.24 to 3.04 °C, which means considerable annual energy savings. This research demonstrates that solar reflectance can reduce the air indoor operative temperature down to 4.16 °C during the month of May in the coldest climate zones. As a result of the simulations, it is noted that the coldest climate zones are influenced to a greater extent by the inclusion of their urban contexts in the simulations. However, the heating demand, without considering it, becomes lower. Therefore, ignoring the urban context produces important errors in the heating analysis (12.2% in the coldest climate zones) and also in the cooling analysis (39% in the hottest climate zones). Finally, the use of renewable energy in the configuration of a model with a high urban canyon (Hc), as well as with an east–west building orientation and a low albedo produces a difference of around 76% in the cooling costs within the hottest climate zones and around 73% in the heating costs within the coldest climate zones. The results of this study can be applied as a guideline in early architectural design.

scholarly journals Cool Roof Impact on Building Energy Need: The Role of Thermal Insulation with Varying Climate Conditions

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3354 ◽  
Author(s):  
Piselli ◽  
Pisello ◽  
Saffari ◽  
Gracia ◽  
Cotana ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Thermal Energy ◽  
Building Energy ◽  
Energy Performance ◽  
Cold Climate ◽  
Climate Conditions ◽  
Building Energy Performance ◽  
Cool Roof ◽  
Solar Reflectance

Cool roof effectiveness in improving building thermal-energy performance is affected by different variables. In particular, roof insulation level and climate conditions are key parameters influencing cool roofs benefits and whole building energy performance. This work aims at assessing the role of cool roof in the optimum roof configuration, i.e., combination of solar reflectance capability and thermal insulation level, in terms of building energy performance in different climate conditions worldwide. To this aim, coupled dynamic thermal-energy simulation and optimization analysis is carried out. In detail, multi-dimensional optimization of combined building roof thermal insulation and solar reflectance is developed to minimize building annual energy consumption for heating–cooling. Results highlight how a high reflectance roof minimizes annual energy need for a small standard office building in the majority of considered climates. Moreover, building energy performance is more sensitive to roof solar reflectance than thermal insulation level, except for the coldest conditions. Therefore, for the selected building, the optimum roof typology presents high solar reflectance capability (0.8) and no/low insulation level (0.00–0.03 m), except for extremely hot or cold climate zones. Accordingly, this research shows how the classic approach of super-insulated buildings should be reframed for the office case toward truly environmentally friendly buildings.

Analysis on Quality Issues for External Thermal Insulation System on Outer Walls

2012 ◽  
Vol 430-432 ◽  
pp. 1628-1631
Author(s):  
Ding Tang Wang
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Insulation System ◽  
Quality Issues

With the coming forth of a batch of energy saving buildings in China, some quality issues of cracking, hollowing, dropping, disrupting of thermal insulation layers follow on the heels of it. This paper analyzes the mechanism and causes of formation on these quality issues and puts forward the corresponding countermeasures for avoiding, treating or taking precaution against these issues. It is a valuable reference to treat the issues on insulation system as well as has directive meanings to install insulation system.

Research of Appropriateness of Residence Outer Wall Thermal Insulating System in New Rural Construction in Zhejiang

2012 ◽  
Vol 461 ◽  
pp. 237-240 ◽  
Author(s):  
Yan Zhu ◽  
Jian Ge ◽  
Dan Hua Ying
Keyword(s):  
Energy Saving ◽  
Thermal Insulation ◽  
Outer Wall ◽  
Pilot Program ◽  
Cold Winter ◽  
Broad Applicability ◽  
Thermal Insulating ◽  
Energy Consumptions ◽  
Rural Construction ◽  
New Rural Construction

Buildings have consumed around 1/4-1/3 of the country’s energy consumptions, of which the envelope structures, especially the outer walls, takes the largest percentage. The pilot program for external thermal insulation in new rural construction has commenced along with full implementation of outer wall energy saving and thermal insulation in Hot Summer and Cold Winter Zone. The program has proved the thermal insulating technology which is characterized by broad applicability, strong operability, reliable thermal insulating performance and low comprehensive cost, is a set of thermal insulating technology compatible with the level of rural economic and technical development in China.

scholarly journals Automobile in the Disposition of Energy-Saving Houses

2014 ◽  
Vol 12 ◽  
pp. 158-163
Author(s):  
Josef Chybík
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Open Space ◽  
Thermal Bridges ◽  
Structural Engineers ◽  
Thermal Relations

In the disposition of energetically economic houses, automobile abandons its stereotype held for so many years according to which it was placed to rest “under one roof” with other residential and utility rooms. However, this diagram shows a range of collisions manifesting with difficult building details, with occurrence of thermal bridges and thermal relations. This results in increased financial demands for drafting efficient thermal insulation layers or higher demand for energy consumption necessary to heat up the building. Generally, architects and structural engineers are not sufficiently aware of the fact that at the same time this is a factor that provides higher potential for faster ageing of car bodies and chassis when cars are parked “inside the house” than in means of transport parked in open carports or in an open space. This Paper deals with analyses of this important, yet often omitted or less-known fact.

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