In this study, the green energy saving of greenhouse sensor node is de- signed to reduce the system power consumption and high efficiency. The green renewable solar energy resources are used as the energy source of no...In this study, the green energy saving of greenhouse sensor node is de- signed to reduce the system power consumption and high efficiency. The green renewable solar energy resources are used as the energy source of nodes; the lowenergy consumed and cost effective MSP430 chip is used as the main control chip of the processor unit; the transmission frequency of the wireless transmission unit is 433 MHz, which has the characteristics of low power consumption, high signal strength, long transmission distance and small signal attenuation during the transmission; the power supply system unit is composed of monocrystalline silicon solar panel and high performance rechargeable lithium ion battery. The selection basis of each unit is clarified in detail, and optimization is performed by hardware circuit and software program to further reduce power consumption. The power consumption of the node is calculated by the experiment, and the charging conditions of the solar panel used in the node is tested. The results show that the system can achieve the setting target through the selection and design.展开更多
The construction industry is embracing sustainable building practices that boost the“triple bottom line”,namely the building’s ecological,social,and financial performance.Since more than 55 million US students spen...The construction industry is embracing sustainable building practices that boost the“triple bottom line”,namely the building’s ecological,social,and financial performance.Since more than 55 million US students spend a significant part of their day in K-12 schools,it is vital that these facilities should provide healthy,comfortable,and productive learning environments.Here we present an in-depth literature review of how educational facilities affect student school performance,comfort,and health,and we examine the role of sustainable design and construction strategies in influencing the physical learning environment in schools.Significant barriers to implementing sustainable strategies are examined,particularly the first cost premium of a sustainable building.A systematic decision strategy is described that incorporates sustainable design strategies,lowering energy consumption and improving indoor environments.A case study describes the process of incorporating sustainable strategies in a K-12 education facility in North Carolina to lower annual energy consumption and greenhouse gas emissions.Ways to reduce the first cost premium and minimize operating costs over the facility’s life while providing healthy and comfortable learning environments for students and teachers are discussed.The case study school also functions as an experimental learning tool for teaching sustainability to K-12 students,having the potential to improve their attitudes and behavior with respect to sustainability.展开更多
为提高温室骨架受力性能,证明装配式骨架在日光温室结构中的可行性,并优化日光温室骨架的装配设计,以陕西省杨凌区某日光温室为研究对象,选取椭圆形单管骨架结构,在内置与外置装配件2种不同连接方式下进行节点设计及有限元分析。分别选...为提高温室骨架受力性能,证明装配式骨架在日光温室结构中的可行性,并优化日光温室骨架的装配设计,以陕西省杨凌区某日光温室为研究对象,选取椭圆形单管骨架结构,在内置与外置装配件2种不同连接方式下进行节点设计及有限元分析。分别选取8、9、10 cm 3种常见规格的装配件与椭圆钢管进行组装,运用ANSYS软件分别计算装配式椭圆管跨中连接部位在5、7、10 kN的集中力作用下节点的受力和变形情况,再设置未截断椭圆钢管作为对照组进行比对。结果表明,当装配式日光温室椭圆管内置10 cm长连接件时结构变形量最小。此外,当主管截面角度取10°时所受应力最小。研究开发出椭圆形装配式骨架并为其开发装配节点,通过静力试验研究装配式骨架受力性能,最后通过有限元数值模拟验证静力试验的可靠性和日光温室骨架装配化设计的可行性。该研究可为日光温室椭圆骨架的装配式开发及装配式节点的优化提供依据。展开更多
农业温室综合能源系统(agricultural greenhouse integrated energy system,AGIES)需深入考虑作物安全生长环境条件,优化调控多源设备功率,实现系统经济、低碳运行。提出了一种基于作物安全性的AGIES低碳控制方法,构建含电、气、热AGIE...农业温室综合能源系统(agricultural greenhouse integrated energy system,AGIES)需深入考虑作物安全生长环境条件,优化调控多源设备功率,实现系统经济、低碳运行。提出了一种基于作物安全性的AGIES低碳控制方法,构建含电、气、热AGIES供能架构,建立各农业设备功率模型,阐明能量流和功率耦合设备的能量转换机制。研究农作物生长的光照、温度、供水安全边界条件,提出作物的日光照量与小时光照量合理范围、室内恒温供热功率范围、科学供水用电功率范围与用电时间范围,并采用数学模型详细描述。提出了电、气、热碳排放核算指标,建立综合运行成本和碳排放成本最低的功率优化控制模型,采用粒子群算法求解,得到优化用能方案。通过算例仿真验证了所提方法的可行性和有效性。展开更多
基金Supported by the Special Foundation Program of President(14007)the Science and Technology Support Program of Tianjin(14ZCZDNC00005)+3 种基金the Modern Agricultural Industry System for Vegetables of Tianjin(ITTVRS2017018)the Commercialization and Promotion of Agricultural Research Findings of Tianjin(201601220)China Spark Program(2015GA610013)the Special Foundation of President(16005)~~
文摘In this study, the green energy saving of greenhouse sensor node is de- signed to reduce the system power consumption and high efficiency. The green renewable solar energy resources are used as the energy source of nodes; the lowenergy consumed and cost effective MSP430 chip is used as the main control chip of the processor unit; the transmission frequency of the wireless transmission unit is 433 MHz, which has the characteristics of low power consumption, high signal strength, long transmission distance and small signal attenuation during the transmission; the power supply system unit is composed of monocrystalline silicon solar panel and high performance rechargeable lithium ion battery. The selection basis of each unit is clarified in detail, and optimization is performed by hardware circuit and software program to further reduce power consumption. The power consumption of the node is calculated by the experiment, and the charging conditions of the solar panel used in the node is tested. The results show that the system can achieve the setting target through the selection and design.
文摘The construction industry is embracing sustainable building practices that boost the“triple bottom line”,namely the building’s ecological,social,and financial performance.Since more than 55 million US students spend a significant part of their day in K-12 schools,it is vital that these facilities should provide healthy,comfortable,and productive learning environments.Here we present an in-depth literature review of how educational facilities affect student school performance,comfort,and health,and we examine the role of sustainable design and construction strategies in influencing the physical learning environment in schools.Significant barriers to implementing sustainable strategies are examined,particularly the first cost premium of a sustainable building.A systematic decision strategy is described that incorporates sustainable design strategies,lowering energy consumption and improving indoor environments.A case study describes the process of incorporating sustainable strategies in a K-12 education facility in North Carolina to lower annual energy consumption and greenhouse gas emissions.Ways to reduce the first cost premium and minimize operating costs over the facility’s life while providing healthy and comfortable learning environments for students and teachers are discussed.The case study school also functions as an experimental learning tool for teaching sustainability to K-12 students,having the potential to improve their attitudes and behavior with respect to sustainability.
文摘为提高温室骨架受力性能,证明装配式骨架在日光温室结构中的可行性,并优化日光温室骨架的装配设计,以陕西省杨凌区某日光温室为研究对象,选取椭圆形单管骨架结构,在内置与外置装配件2种不同连接方式下进行节点设计及有限元分析。分别选取8、9、10 cm 3种常见规格的装配件与椭圆钢管进行组装,运用ANSYS软件分别计算装配式椭圆管跨中连接部位在5、7、10 kN的集中力作用下节点的受力和变形情况,再设置未截断椭圆钢管作为对照组进行比对。结果表明,当装配式日光温室椭圆管内置10 cm长连接件时结构变形量最小。此外,当主管截面角度取10°时所受应力最小。研究开发出椭圆形装配式骨架并为其开发装配节点,通过静力试验研究装配式骨架受力性能,最后通过有限元数值模拟验证静力试验的可靠性和日光温室骨架装配化设计的可行性。该研究可为日光温室椭圆骨架的装配式开发及装配式节点的优化提供依据。
文摘农业温室综合能源系统(agricultural greenhouse integrated energy system,AGIES)需深入考虑作物安全生长环境条件,优化调控多源设备功率,实现系统经济、低碳运行。提出了一种基于作物安全性的AGIES低碳控制方法,构建含电、气、热AGIES供能架构,建立各农业设备功率模型,阐明能量流和功率耦合设备的能量转换机制。研究农作物生长的光照、温度、供水安全边界条件,提出作物的日光照量与小时光照量合理范围、室内恒温供热功率范围、科学供水用电功率范围与用电时间范围,并采用数学模型详细描述。提出了电、气、热碳排放核算指标,建立综合运行成本和碳排放成本最低的功率优化控制模型,采用粒子群算法求解,得到优化用能方案。通过算例仿真验证了所提方法的可行性和有效性。
