scholarly journals Research and Development of Civil Engineering Intelligent Structure System

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Junkai Xie ◽  
Bo Gao ◽  
Huamin Cheng
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Civil Engineering ◽  
Three Dimensional ◽  
Calculation Model ◽  
Fiber Grating ◽  
Exterior Wall ◽  
Structural System ◽  
Insulation Materials ◽  
Saving Effect

With the rapid development of global civil engineering construction, the intelligent structural system of civil engineering has evolved into one of the current global frontier disciplines. The research on the intelligent structural system of civil engineering and the current development situation are analyzed, and the main problems are combined. Giving reasonable suggestions is of great significance to the country's vigorous development of civil engineering intelligent structure system. This paper designs a new type of three-dimensional fiber grating sensor, including the design of the matrix model and the design of fiber grating strain gauges. This new sensor can effectively measure three-dimensional space, greatly expanding the application range of fiber grating sensors. In this paper, the design lighting area of each light pipe is taken as a unit. Each unit is set with 4 measuring points at the center and the edge. Each measuring point reads 3 illuminance value parameters and records the average value. Based on the results and comprehensive consideration of the short board situation, the research conclusions and recommendations are put forward. The foundation wall with aerated concrete blocks as the wall material can meet the requirements of 50% energy saving for exterior wall buildings with external decoration and internal insulation mortar. Compared with the benchmark wall of 50% energy saving of external wall buildings, the heat transfer coefficient is reduced by 50.1%, and the actual energy-saving effect of the wall can reach 75%. Meet the requirements of 65% for the energy-saving effect of exterior wall buildings. This paper considers economic parameters, such as the investment cost of building insulation materials, energy-saving income, and investment recovery period, and establishes a calculation model for analyzing the economics of insulation materials. Based on the heat transfer model of the composite wall and the fuel energy combustion equation, greenhouse gas is an established calculation model for CO2 and SO2 emissions. Studies have shown that when considering the room temperature insulation performance of insulation materials, the time required for the side of the concrete slab with glass fiber felt and aerogel insulation materials is about 2022 and 3363 s, respectively, indicating the fire resistance of aerogel insulation materials significantly better than fiberglass.

scholarly journals Intelligent Calculation Model and Algorithm Optimization of Optimal Operation of Integrated Energy System

2021 ◽  
Vol 2083 (3) ◽  
pp. 032033
Author(s):  
Kun Wang ◽  
Guochao Yang ◽  
Baohua Cheng ◽  
Zhiyong Gan ◽  
Yan Qi ◽  
...  
Keyword(s):  
Energy Saving ◽  
Heat Pump ◽  
Energy System ◽  
Calculation Model ◽  
Optimal Operation ◽  
Ground Source Heat Pump ◽  
Pump System ◽  
Heat Pump System ◽  
Ground Source ◽  
Saving Effect

Abstract This paper analyzes the energy saving effect and optimal operation of the integrated park type energy system. The park type integrated energy system includes photovoltaic power generation system, ground source heat pump system, solar air conditioning system, regenerative electric boiler system and solar hot water system and so on. The energy saving benefit calculation model of each subsystem is established, and according to the operation history data of each subsystem, the calculation results of each subsystem are analyzed. It shows that: The energy saving income of photovoltaic power generation system is 734,200 yuan/year. The main revenue comes from the second and third quarters, during which it should pay attention to the maintenance of photovoltaic modules to ensure the maximum energy saving benefit. The energy saving income of ground source heat pump system in summer is 155,900 yuan/year, and the energy saving effect is not significant. It can cooperate with traditional units for cooling in summer. The heating in winter in the park is provided by ground source heat pump system, regenerative electric boiler system and solar energy air conditioning system. Its energy saving benefit is 3.995 million yuan/year which is the main source of energy saving income in the park, with remarkable energy saving effect.

scholarly journals Analysis of Strengthening the Application of External Wall Insulation Materials in Green Building Energy Saving Project

2020 ◽  
Vol 3 (2) ◽  
pp. 32
Author(s):  
Wenxin Luo
Keyword(s):  
Energy Saving ◽  
Construction Industry ◽  
Urban Areas ◽  
Building Materials ◽  
Green Building ◽  
Green Buildings ◽  
Exterior Wall ◽  
Insulation Materials ◽  
Environment Quality

<p>For the development and progress direction of contemporary construction industry, greening has always been one of the most important topics, which is basically consistent with China’s guidelines on environmental protection and resource conservation, with emphasis on whether it can effectively improve the ecological environment quality in urban areas, control various hazards caused by pollution, and build a healthy urban environment for people. Nowadays, the building materials market has also developed in an all-round way, and the types of materials for exterior wall insulation are also increasing. Relatively, the practical application difficulty of various technologies in the construction industry also shows an increasing trend. In order to better highlight the important role of insulation materials for green buildings, this paper will explore the application of exterior wall insulation materials with strong energy saving in green buildings.</p>

Heat Transfer Technology for Textile Workshop

2013 ◽  
Vol 664 ◽  
pp. 1210-1213
Author(s):  
Rui Liang Yang ◽  
Cai Xia Zhu ◽  
Ya Fei Xiong ◽  
Zi Long Xu
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Large Scale ◽  
Good Effect ◽  
Engineering Project ◽  
Heat Quantity ◽  
Saving Effect ◽  
Reasonable Use

Because each workshop heat quantity is different and cannot be reasonable use, the textile enterprise wastes a great deal energy in winter. To solve this problem, this paper puts forward heat transfer technology for the textile workshop, that is, heat transfer between different workshops to reasonable use heat quantity. This technology can be very good effect in energy saving. This paper introduces the principle and method of the technology, and verifies the energy saving effect of this method with engineering project, which provides technical reference for the method of the large-scale application and popularization.

The Application and Developmental Trend of Exterior Wall External Insulation

2012 ◽  
Vol 174-177 ◽  
pp. 1367-1371 ◽  
Author(s):  
Shu Rong Guo
Keyword(s):  
Energy Saving ◽  
Heat Insulation ◽  
Uneven Development ◽  
Developmental Trend ◽  
Exterior Wall ◽  
Insulation Materials ◽  
External Insulation

Materials for exterior wall external insulation have various types and the uneven development in different areas. Based on the studies of related works, exterior wall external insulation can be generalized as four series according to the construction technologies, which includes the series of the plug-in insulation materials, the slurry and spray, the concrete sandwich heat insulation, and the energy-saving inorganic insulation materials. Associated with China’s situation, the application features and developmental prospect of main exterior wall external insulation materials in every series have been emphasized, and furthermore, several suggestions have been given to the development of exterior wall external insulation materials in China.

Analysis of Anshan Existing Residential Building Exterior Wall Energy Saving Reconstruction

2014 ◽  
Vol 1004-1005 ◽  
pp. 1565-1569
Author(s):  
Yu Ze Tian ◽  
Yang Yu
Keyword(s):  
Energy Saving ◽  
Residential Buildings ◽  
Residential Building ◽  
Building Energy ◽  
Building Envelope ◽  
Exterior Wall ◽  
Wall Area ◽  
External Wall ◽  
Residential District ◽  
Saving Effect

This paper introduces the present situation of existing residential building energy saving reconstruction of Anshan area, the result of the analysis is that the renovation of retaining structure is the key of the reconstruction of existing residential buildings of Anshan. Exterior wall area ratio of the total area of the building envelope accounts for quite large, so transformation of exterior wall is the key. Energy saving wall approach divided into external wall insulation and exterior insulation. Analysis of energy-saving measures by the external wall insulation, and the external wall of a residential district in Anshan city and analysis of thermal insulation and energy saving renovation case, better energy-saving effect, energy saving measures of external economy more external insulation, the region has provided the reference and basis transformation of external wall energy-saving residence building.

The Energy Saving Effect Evaluation for Outside Wall with Different Material in Island District

2011 ◽  
Vol 301-303 ◽  
pp. 377-383 ◽  
Author(s):  
Yan Zhang ◽  
Xi Wu Gong
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Energy Saving ◽  
Brick Wall ◽  
Insulating Layer ◽  
Aerated Concrete ◽  
Saving Effect ◽  
Insulation Performance ◽  
The Heat Transfer Coefficient

In order to evaluate the energy saving effect for building outside wall under the damp island environment, the heat insulation performance of brick wall, MU10 concrete brick wall and aerated concrete are tested. The testing method is combined of infrared photos and heat flow meter. The results showed that the insulation performance of clay brick is worst, its heat transfer coefficient is 60% more than that required by energy saving standard. Although the concrete brick has painted 25mm polystyrene granule outside, the heat transfer coefficient is still smaller than energy saving standard required. The economic thickness of polystyrene granule is 79mm , which makes the both heating cost and insulating layer minimum during the life cycle of heat insulating layer. Among the three types of outside wall, only the aerated concrete can satisfy the energy saving standard for hot summer and cold winter district, it constitutes the self-insulating system.

Fly Ash Autoclaved Aerated Concrete Self Thermal Insulation Building Envelope Energy Saving Research

2013 ◽  
Vol 448-453 ◽  
pp. 1243-1247 ◽  
Author(s):  
Li Bai ◽  
Ying Li ◽  
Shu Ming He
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Fly Ash ◽  
Transfer Coefficient ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Building Envelope ◽  
Exterior Wall ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete

This article takes an actual public building in Changchun City as an example to field test the heat transfer coefficient of fly ash autoclaved aerated concrete exterior wall. By analysis the field test value, theory calculation value, and the maximum value of the design standard for energy efficiency of public building (GB50189-2005), I concluded that fly ash autoclaved aerated concrete self-thermal insulation building envelope exterior wall fully meet the energy-saving standard requirements, which does not need additional insulation material. And further as heat transfer coefficient of wall test and energy saving standard maximum heat transfer coefficient as the main parameter, I used DeST-c software simulation to calculate the building energy consumption. The simulation results showed that the heating energy consumption of fly ash autoclaved aerated concrete self-thermal insulation building envelope is 16.32% lower than the standards required value, which has the advantage of energy saving property.

Investigation of Steam Turbine Warm-Keeping by Use of Air

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Dennis Toebben ◽  
Piotr Luczynski ◽  
Manfred Wirsum ◽  
Wolfgang F. D. Mohr ◽  
Klaus Helbig
Keyword(s):  
Heat Transfer ◽  
Steam Turbine ◽  
Power Plants ◽  
Three Dimensional ◽  
Calculation Model ◽  
Heat Radiation ◽  
Technical Solution ◽  
Fe Model ◽  
Contact Heat ◽  
Start Up

AbstractThe changing energy landscape leads to a rising demand of more flexible power generation. A system for steam turbine (ST) warm-keeping provides the ability to shutdown conventional power plants during periods with a high share of renewable power. Simultaneously, these power plants are ready for grid stabilization on demand without an excessive consumption of lifetime during the start-up. One technical solution to keep a ST warm is the use of hot air, which is passed through the turbine. In addition, the air supply prevents corrosion during standstill and also enables the prewarming after maintenance or long outages. This paper investigates the warm-keeping process of an intermediate pressure (IP) ST (double-shell configuration) through the use of dynamic numerical finite element (FE) simulations. As a representative test case, warm-keeping calculations during a weekend shutdown (60 h) are conducted to investigate the temperatures, their distribution, and gradients within the rotor and the casing. For this purpose, an improved numerical calculation model is developed. This detailed three-dimensional FE model (including blades and vanes) uses heat transfer correlations conceived for warm-keeping with low air mass flows in gear mode operation. These analytical correlations take heat radiation, convection, and contact heat transfer at the blade roots into account. The thermal boundary conditions (BCs) at the outer walls of the rotor and casing are determined by use of experimental natural cool-down data. The calculation model is finally compared and verified with this dataset. The results offer valuable information about the thermal condition of the ST for a subsequent start-up procedure. The warm-keeping operation with air is able to preserve hot start conditions for any time period. Most of the heat is transferred close to the steam inlet of the turbine, which is caused by similar flow directions of air and steam. Thus, temperatures in the last stages and in the casing remain well below material limits. This allows higher temperatures at the first blade groove of the turbine, which is highly loaded during a turbine startup and thus crucial to the lifetime.

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