空气平衡协会(Associated Air Balancing Council,AABC)作为北美HVAC(暖通空调)工程领域的关键认证机构,在石油工程等领域的工程项目中,对HVAC系统的调试起到了规范和保障作用。现基于加拿大LNG项目的实践经验,深入探讨了AABC认证体系...空气平衡协会(Associated Air Balancing Council,AABC)作为北美HVAC(暖通空调)工程领域的关键认证机构,在石油工程等领域的工程项目中,对HVAC系统的调试起到了规范和保障作用。现基于加拿大LNG项目的实践经验,深入探讨了AABC认证体系下石油工程HVAC调试的方法,涵盖了调试目的、检查流程、调试程序、报告验证等方面,为行业提供了全面的参考。展开更多
To meet the challenge of mismatches between power supply and demand,modern buildings must schedule flexible energy loads in order to improve the efficiency of power grids.Furthermore,it is essential to understand the ...To meet the challenge of mismatches between power supply and demand,modern buildings must schedule flexible energy loads in order to improve the efficiency of power grids.Furthermore,it is essential to understand the effectiveness of flexibility management strategies under different climate conditions and extreme weather events.Using both typical and extreme weather data from cities in five major climate zones of China,this study investigates the energy flexibility potential of an office building under three short-term HVAC management strategies in the context of different climates.The results show that the peak load flexibility and overall energy performance of the three short-term strategies were affected by the surrounding climate conditions.The peak load reduction rate of the pre-cooling and zone temperature reset strategies declined linearly as outdoor temperature increased.Under extreme climate conditions,the daily peak-load time was found to be over two hours earlier than under typical conditions,and the intensive solar radiation found in the extreme conditions can weaken the correlation between peak load reduction and outdoor temperature,risking the ability of a building’s HVAC system to maintain a comfortable indoor environment.展开更多
Heating,ventilation,and air conditioning(HVAC)systems contribute substantially to global energy consumption,while rejecting significant amounts of low-grade heat into the environment.This paper presents a nonintrusive...Heating,ventilation,and air conditioning(HVAC)systems contribute substantially to global energy consumption,while rejecting significant amounts of low-grade heat into the environment.This paper presents a nonintrusive spiral-coil heat exchanger designed to recover waste heat from the outdoor condenser of a split-type air conditioner.The system operates externally without altering the existing HVAC configuration,thereby rendering it suitable for retrofitting.Water was circulated as the working fluid at flow rates of 0.028–0.052 kg/s to assess thermal performance.Performance indicators,including the outlet water temperature,heat transfer rate,convective coefficient,and efficiency,were systematically evaluated.The system achieved a maximum outlet water temperature of 67℃and a peak thermal efficiency of 91.07%at the highest flow rate.The uncertainty analysis confirmed reliable measurements within±3.45%.The monthly energy savings were estimated at 178.35 kWh,accompanied by a reduction in CO_(2)emissions of up to 187.26 kg,yielding a short payback period of 1.06 years.These results demonstrate the feasibility of spiral-coil heat exchangers as cost-effective and eco-friendly alternatives to conventional electric water heaters.The proposed approach not only enhances the overall energy utilization but also contributes to energy conservation and climate mitigation objectives.展开更多
This research focuses on quality control strategies in real estate HVAC engineering construction management.It first elaborates on the role of HVAC systems and challenges like material compliance risks and installatio...This research focuses on quality control strategies in real estate HVAC engineering construction management.It first elaborates on the role of HVAC systems and challenges like material compliance risks and installation deficiencies.Then it details design validation,vendor qualification,and construction-phase monitoring methods.Case studies in various real estate projects illustrate these strategies,and a 5-phase quality maturity model was proposed for quality improvement.展开更多
Building HVAC equipment installation is vital for indoor comfort,energy efficiency,and environmental quality.Key technologies like vibration control,pipe network alignment,and thermal stress compensation,along with a ...Building HVAC equipment installation is vital for indoor comfort,energy efficiency,and environmental quality.Key technologies like vibration control,pipe network alignment,and thermal stress compensation,along with a multi-faceted quality standards framework,are crucial.Effective process management,practical application analysis,and the integration of robotics,IoT,and AI enhance quality and efficiency.Sustainable development strategies and lifecycle-oriented quality management are also essential for future progress.展开更多
针对暖通空调(HVAC)系统难以控制的问题,提出一种基于m ax-product推理的M am dan i模糊模型预测控制策略.首先利用一步模糊预测模型的结构分析得到其解析表达式,获得系统在k+1时刻的线性化预测模型;然后基于模糊线性化模型进行模型预...针对暖通空调(HVAC)系统难以控制的问题,提出一种基于m ax-product推理的M am dan i模糊模型预测控制策略.首先利用一步模糊预测模型的结构分析得到其解析表达式,获得系统在k+1时刻的线性化预测模型;然后基于模糊线性化模型进行模型预测控制器设计.对HVAC系统的仿真和实验结果表明,该算法是一种跟踪性能好且鲁棒性强的有效控制算法.展开更多
文摘空气平衡协会(Associated Air Balancing Council,AABC)作为北美HVAC(暖通空调)工程领域的关键认证机构,在石油工程等领域的工程项目中,对HVAC系统的调试起到了规范和保障作用。现基于加拿大LNG项目的实践经验,深入探讨了AABC认证体系下石油工程HVAC调试的方法,涵盖了调试目的、检查流程、调试程序、报告验证等方面,为行业提供了全面的参考。
基金National Key R&D Program of China of the 13th Five-Year Plan(No.2018YFD1100704)。
文摘To meet the challenge of mismatches between power supply and demand,modern buildings must schedule flexible energy loads in order to improve the efficiency of power grids.Furthermore,it is essential to understand the effectiveness of flexibility management strategies under different climate conditions and extreme weather events.Using both typical and extreme weather data from cities in five major climate zones of China,this study investigates the energy flexibility potential of an office building under three short-term HVAC management strategies in the context of different climates.The results show that the peak load flexibility and overall energy performance of the three short-term strategies were affected by the surrounding climate conditions.The peak load reduction rate of the pre-cooling and zone temperature reset strategies declined linearly as outdoor temperature increased.Under extreme climate conditions,the daily peak-load time was found to be over two hours earlier than under typical conditions,and the intensive solar radiation found in the extreme conditions can weaken the correlation between peak load reduction and outdoor temperature,risking the ability of a building’s HVAC system to maintain a comfortable indoor environment.
文摘Heating,ventilation,and air conditioning(HVAC)systems contribute substantially to global energy consumption,while rejecting significant amounts of low-grade heat into the environment.This paper presents a nonintrusive spiral-coil heat exchanger designed to recover waste heat from the outdoor condenser of a split-type air conditioner.The system operates externally without altering the existing HVAC configuration,thereby rendering it suitable for retrofitting.Water was circulated as the working fluid at flow rates of 0.028–0.052 kg/s to assess thermal performance.Performance indicators,including the outlet water temperature,heat transfer rate,convective coefficient,and efficiency,were systematically evaluated.The system achieved a maximum outlet water temperature of 67℃and a peak thermal efficiency of 91.07%at the highest flow rate.The uncertainty analysis confirmed reliable measurements within±3.45%.The monthly energy savings were estimated at 178.35 kWh,accompanied by a reduction in CO_(2)emissions of up to 187.26 kg,yielding a short payback period of 1.06 years.These results demonstrate the feasibility of spiral-coil heat exchangers as cost-effective and eco-friendly alternatives to conventional electric water heaters.The proposed approach not only enhances the overall energy utilization but also contributes to energy conservation and climate mitigation objectives.
文摘This research focuses on quality control strategies in real estate HVAC engineering construction management.It first elaborates on the role of HVAC systems and challenges like material compliance risks and installation deficiencies.Then it details design validation,vendor qualification,and construction-phase monitoring methods.Case studies in various real estate projects illustrate these strategies,and a 5-phase quality maturity model was proposed for quality improvement.
文摘Building HVAC equipment installation is vital for indoor comfort,energy efficiency,and environmental quality.Key technologies like vibration control,pipe network alignment,and thermal stress compensation,along with a multi-faceted quality standards framework,are crucial.Effective process management,practical application analysis,and the integration of robotics,IoT,and AI enhance quality and efficiency.Sustainable development strategies and lifecycle-oriented quality management are also essential for future progress.
文摘针对暖通空调(HVAC)系统难以控制的问题,提出一种基于m ax-product推理的M am dan i模糊模型预测控制策略.首先利用一步模糊预测模型的结构分析得到其解析表达式,获得系统在k+1时刻的线性化预测模型;然后基于模糊线性化模型进行模型预测控制器设计.对HVAC系统的仿真和实验结果表明,该算法是一种跟踪性能好且鲁棒性强的有效控制算法.
