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学者姓名：王伟
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Abstract ：
Frosting is a critical challenge that affects the energy efficiency of air source heat pumps (ASHPs). Defrosting periodically is the most widely used method to solve this problem. However, the rate of frosting varies considerably for ASHPs due to their configurations and operations (CICO) being different. This leads to the obvious differences in their defrosting initiating time. Defrosting too early or too late will both cause energy loss. To ensure the efficient operation of ASHPs, the variations of energy loss coefficient caused by frosting-defrosting (epsilon NL) and the defrosting initiating time for ASHPs with different CICO values were investigated. Based on the theory of optimal defrosting initiating time (Topt) and experimental results under different frosting durations, the Topt for different ASHPs is found. Then, a prediction model for ASHPs with different CICO values is established. Results show that there is a Topt for ASHPs with different CICO values, respectively. Under the frosting condition of 2/1 degrees C, the Topt increases with the rise of CICO values. When the CICO values increase from 3.14 to 22.44, the corresponding Topt increases from 22 min to 148 min. By fitting the Topt and CICO values, a cubic mathematical model for the prediction of the optimal defrosting time of ASHPs has been developed.
Keyword ：
Optimal defrosting initiating time Optimal defrosting initiating time Frosting energy loss Frosting energy loss Different configurations and operations Different configurations and operations Defrosting energy loss Defrosting energy loss Air source heat pumps Air source heat pumps
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| GB/T 7714 | Wang, Shiquan , Wei, Wenzhe , Luo, Jianfei et al. A prediction model of the optimal defrosting initiating time for the air source heat pumps with different configurations and operations [J]. | ENERGY AND BUILDINGS , 2025 , 326 . |
| MLA | Wang, Shiquan et al. "A prediction model of the optimal defrosting initiating time for the air source heat pumps with different configurations and operations" . | ENERGY AND BUILDINGS 326 (2025) . |
| APA | Wang, Shiquan , Wei, Wenzhe , Luo, Jianfei , Wang, Wei , Sun, Yuying , Li, Zhaoyang et al. A prediction model of the optimal defrosting initiating time for the air source heat pumps with different configurations and operations . | ENERGY AND BUILDINGS , 2025 , 326 . |
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Abstract ：
In space heating, air source heat pumps (ASHPs) always encounter mal-defrosting incidents, resulting in significant energy waste. To improve the defrosting accuracy of ASHP, this paper proposes a novel Time-CurrentTemperature difference (T-I-T) defrosting control method based on the characteristic parameter of outdoor fan operation (current). Through theoretical analysis and experimental tests, the influence of frosting on the characteristic parameters of outdoor fan operation was revealed. Then, based on the optimal defrosting control point theory, a method for selecting the defrosting current threshold close to the actual ASHP was proposed. Ultimately, a novel Time-Current-Temperature Difference (T-I-T) defrosting control method was developed, using the current increment to control the defrosting operation. The results showed that, the defrosting current thresholds decreased as the severity of frosting decreases, from 1.52 to 0.78 A. The T-I-T defrosting control method enables the ASHP unit to operate stably and efficiently in space heating. The defrosting frequency decreased from 0.93 to 0.56 times per hour, a reduction of 39.80 %; the average duration of the frosting/ defrosting cycle increases from 64.30 to 106.90 min (an increase of 66.25 %), and the average COP of the ASHP unit increases by 10.60 % compared to the T-T defrosting control method.
Keyword ：
Time-Current-Temperature Difference Time-Current-Temperature Difference Defrosting current threshold Defrosting current threshold Air source heat pump Air source heat pump Outdoor fan operating parameters Outdoor fan operating parameters defrosting control method defrosting control method
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| GB/T 7714 | Tang, Rui , Wei, Wenzhe , Sun, Ping et al. A novel time-current-temperature difference (T-I-T) defrosting control method for air source heat pump based on outdoor fan operation characteristics in space heating [J]. | APPLIED THERMAL ENGINEERING , 2024 , 259 . |
| MLA | Tang, Rui et al. "A novel time-current-temperature difference (T-I-T) defrosting control method for air source heat pump based on outdoor fan operation characteristics in space heating" . | APPLIED THERMAL ENGINEERING 259 (2024) . |
| APA | Tang, Rui , Wei, Wenzhe , Sun, Ping , Zhao, Jihan , Wang, Wei , Sun, Yuying et al. A novel time-current-temperature difference (T-I-T) defrosting control method for air source heat pump based on outdoor fan operation characteristics in space heating . | APPLIED THERMAL ENGINEERING , 2024 , 259 . |
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Abstract ：
Air-supported membrane (ASM) envelopes offer an effective solution for creating large interior spaces for buildings with lower energy consumption and carbon emissions. However, there is little research on the thermal performance of ASM envelopes, particularly regarding the natural convection within the air interlayer and its impact on thermal resistance. To address this gap, this study developed a numerical model of ASM envelopes and validated it through experiments. Subsequently, a numerical investigation was conducted to analyze natural convection and thermal resistance while considering factors such as indoor-outdoor temperature difference, membrane emissivity and air interlayer thickness. Results indicated that with the emissivity increased from 0.2 to 1, the thermal resistance of the air interlayer and the envelope decreased by 32.35 % and 9.13 %, respectively. Besides, the thickness of air interlayer also had evident effect on thermal resistance. When it increased from 5 mm to 35 mm, the thermal resistance of the air interlayer and the envelope increased by 156.19 % and 14.74 %, and further results in the heat transfer decreased by 13.85 %. However, the convective heat transfer would remain constant when the thickness exceeded 35 mm. This study provided valuable reference for optimizing the design of ASM envelopes and accurately calculating their thermal resistance.
Keyword ：
Thermal resistance Thermal resistance Air interlayer Air interlayer Air-supported membrane envelope Air-supported membrane envelope Numerical simulation Numerical simulation Natural convective Natural convective
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| GB/T 7714 | Huang, Chengyang , Sun, Yuying , Wang, Hongyan et al. Thermal performance analysis and optimization of air-supported membrane building envelope based on numerical simulation [J]. | THIN-WALLED STRUCTURES , 2024 , 206 . |
| MLA | Huang, Chengyang et al. "Thermal performance analysis and optimization of air-supported membrane building envelope based on numerical simulation" . | THIN-WALLED STRUCTURES 206 (2024) . |
| APA | Huang, Chengyang , Sun, Yuying , Wang, Hongyan , Pang, Mingxin , Wang, Wei , Wei, Wenzhe . Thermal performance analysis and optimization of air-supported membrane building envelope based on numerical simulation . | THIN-WALLED STRUCTURES , 2024 , 206 . |
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Abstract ：
The dynamic fluctuations in occupant flow within airport terminals contribute to delays in the system ' s response under traditional feedback control. This imbalance between supply and demand can result in discomfort and unnecessary energy consumption. While Occupant-Based Model Predictive Control (OBMPC) has gained research interest as it leverages occupant forecasts to enhance control performance, there is limited knowledge regarding its application in the air-conditioning systems of airport terminals, mainly due to the intricate dynamics of occupant flow in terminal buildings. In this study, we proposed a model predictive control strategy based on dynamic occupant flow with the goal of fast responding to occupant flow and reducing energy consumption. We integrated mathematical formulas and the Anylogic simulation software to predict occupant variations in the baggage claim hall. The model predictive control strategy of the air conditioning system was proposed with the predicted occupant flow. The proposed strategy was evaluated throughout the whole cooling season in the validated simulation model of the air handling unit system of the baggage claim hall at an airport terminal. The results demonstrated that the proposed strategy could effectively respond to variations in occupancy and achieve 10% energy savings throughout the entire cooling season, compared to conventional feedback control. Our work presents a viable solution to address system regulation lag and reduce energy consumption without jeopardizing thermal comfort.
Keyword ：
Model predictive control Model predictive control Dynamic occupant flow Dynamic occupant flow Air conditioning system Air conditioning system Baggage claim hall Baggage claim hall
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| GB/T 7714 | Ma, Kai , Wang, Dan , Sun, Yuying et al. Model predictive control for thermal comfort and energy optimization of an air handling unit system in airport terminals using occupant feedback [J]. | SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS , 2024 , 65 . |
| MLA | Ma, Kai et al. "Model predictive control for thermal comfort and energy optimization of an air handling unit system in airport terminals using occupant feedback" . | SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS 65 (2024) . |
| APA | Ma, Kai , Wang, Dan , Sun, Yuying , Wang, Wei , Gu, Xianliang . Model predictive control for thermal comfort and energy optimization of an air handling unit system in airport terminals using occupant feedback . | SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS , 2024 , 65 . |
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Abstract ：
For air source heat pump with vapor injection (ASHPVI), the vapor injection can improve its heating performance of ASHPVI at non-frosting low temperature condition. However, its effect under the frosting condition is still unclear. To improve the heating performance of ASHPVI under frosting condition, a test rig for the frosting of ASHPVI was built in a psychrometer testing room. Then, a new control strategy for vapor injection was proposed to ensure its safety, and two groups of frosting experiments with and without vapor injection were conducted. Results showed that under frosting condition, vapor injection can still improve the heating capacity of ASHPVI by 11.31 %. It can also make the outdoor coil surface temperature decreased by 0.8-4.6 degrees C, and further result in a faster frosting speed. Compared with the frosting duration without vapor injection (64 min), the frosting duration with vapor injection is shortened by 14 min. Owing to the faster frosting speed, the average COP with vapor injection decreases by 0.17, with a decrease rate of 6.03 %. When the heating capacity of AHSPVI without vapor injection under frosting condition can meet the building heating load, the vapor injection should not be adopted.
Keyword ：
Frosting duration Frosting duration Air source heat pump Air source heat pump Space heating Space heating Frosting Frosting Vapor injection Vapor injection
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| GB/T 7714 | Wei, Wenzhe , Feng, Zhenglei , Sun, Yuying et al. Experimental investigation on the space heating performance of air source heat pump with vapor injection under frosting condition [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
| MLA | Wei, Wenzhe et al. "Experimental investigation on the space heating performance of air source heat pump with vapor injection under frosting condition" . | JOURNAL OF BUILDING ENGINEERING 90 (2024) . |
| APA | Wei, Wenzhe , Feng, Zhenglei , Sun, Yuying , Wang, Wei , Jin, Xinyue , Zhang, Jianfei et al. Experimental investigation on the space heating performance of air source heat pump with vapor injection under frosting condition . | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
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Abstract ：
一种基于室外温度自动调整温差的热泵除霜启动控制方法，涉及一种空气源热泵除霜启动控制方法。进行空气源热泵的结除霜实验，确定除霜最优室外盘管表面温度，获得室外空气与室外盘管表面的温差阈值随室外空气温度变化拟合方程，制热运行过程中实时监测室外空气温度和室外盘管表面温度，若二者的差值大于拟合计算得到的该温度下的温差阈值，则进行除霜操作。基于最佳除霜控制点理论和制冷剂随室外温度的变化特性，得到不同室外温度下最佳除霜时刻室外空气与室外盘管表面的温差阈值，然后基于该温差阈值控制空气源热泵的除霜启动，可根据室外温度自动调整实现准确除霜，提升空气源热泵的除霜准确率和供暖性能系数，降低建筑供暖能耗。
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| GB/T 7714 | 魏文哲 , 王伟 , 黄成洋 et al. 一种基于室外温度自动调整温差的热泵除霜启动控制方法 : CN202310941345.6[P]. | 2023-07-28 . |
| MLA | 魏文哲 et al. "一种基于室外温度自动调整温差的热泵除霜启动控制方法" : CN202310941345.6. | 2023-07-28 . |
| APA | 魏文哲 , 王伟 , 黄成洋 , 孙育英 , 林瑶 , 王世权 . 一种基于室外温度自动调整温差的热泵除霜启动控制方法 : CN202310941345.6. | 2023-07-28 . |
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Abstract ：
一种基于强化学习的多冷源环状供冷系统压差控制方法，涉及多冷源环状区域供冷系统优化控制领域。首先，基于设计及运行数据建立多冷源环状供冷系统的Modelica模型；其次，构造多冷源环状供冷系统的状态空间、动作空间和奖励函数，并基于Python语言实现强化学习算法；再次，通过FMI(Functional Mockup Interface)接口协议，实现Python和Modelica模型的实时联合仿真功能；最后，利用联合仿真，优化各个冷源供回水压差值设定值。
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| GB/T 7714 | 王伟 , 王丹 , 高成 et al. 一种基于强化学习的多冷源环状供冷系统压差控制方法 : CN202310637307.1[P]. | 2023-05-31 . |
| MLA | 王伟 et al. "一种基于强化学习的多冷源环状供冷系统压差控制方法" : CN202310637307.1. | 2023-05-31 . |
| APA | 王伟 , 王丹 , 高成 , 朱世豪 , 马凯 , 孙育英 . 一种基于强化学习的多冷源环状供冷系统压差控制方法 : CN202310637307.1. | 2023-05-31 . |
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Abstract ：
一种基于抑霜性能图的变频空气源热泵抑霜运行方法，属于抑霜技术领域。首先，绘制当前工况下的变频机组抑霜性能图；其次，根据抑霜性能图所反映的制热能力范围和抑霜潜力，再依据此时的建筑负荷需求，确定制热目标和抑霜运行目标；再次，根据上述需求和目标确定变频空气源热泵的压缩机频率和室外风机频率；最后，通过机组抑霜运行控制器控制压缩机和风机频率的输出，实现制热和抑霜需求。在满足制热能力的基础上，实现机组的有效抑霜运行。
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| GB/T 7714 | 王伟 , 林瑶 , 孙育英 et al. 一种基于抑霜性能图的变频空气源热泵抑霜运行方法 : CN202310576480.5[P]. | 2023-05-21 . |
| MLA | 王伟 et al. "一种基于抑霜性能图的变频空气源热泵抑霜运行方法" : CN202310576480.5. | 2023-05-21 . |
| APA | 王伟 , 林瑶 , 孙育英 , 魏文哲 , 江志科 , 王世权 et al. 一种基于抑霜性能图的变频空气源热泵抑霜运行方法 : CN202310576480.5. | 2023-05-21 . |
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Abstract ：
一种基于变频空气源热泵有限调控能力的抑霜运行方法，涉及空气源热泵抑霜技术和运行控制领域。首先，采集实时运行的压缩机频率和室外风机频率；其次，根据空气源热泵机组的除霜操作信息，确定机组是否运行于结霜工况；最后，根据所处的结霜工况，智能调节室外风机频率至最大值，以实现机组的抑霜运行。本发明在满足建筑供暖的同时，进行抑霜，达到了充分利用机组配置的效果，同时开辟了一种全新的抑霜方向。
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| GB/T 7714 | 王伟 , 林瑶 , 孙育英 et al. 一种基于变频空气源热泵有限调控能力的抑霜运行方法 : CN202310574482.0[P]. | 2023-05-21 . |
| MLA | 王伟 et al. "一种基于变频空气源热泵有限调控能力的抑霜运行方法" : CN202310574482.0. | 2023-05-21 . |
| APA | 王伟 , 林瑶 , 孙育英 , 魏文哲 , 江志科 , 王世权 et al. 一种基于变频空气源热泵有限调控能力的抑霜运行方法 : CN202310574482.0. | 2023-05-21 . |
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Abstract ：
In cities, there are thousands of wastewater treatment plants. The treated tail water drained from them is clean relatively, and has a stable flow rate. Extracting heat from it through tail water source heat pumps (TWSHP) for space heating can decrease the building heating energy consumption significantly. Besides, by integrating with thermal energy storage (TES), it can realize the goal of peak load shifting, especially in commercial buildings. However, there is few reports on its experimental investigations or engineering applications till now. To promote the application of TWSHP integrated with TES system, it was designed for the space heating of a technology park in Beijing, and a control method was proposed to decrease the operating cost by using the valley electricity. Then, utilizing its operating parameters in the heating season of 2021-2022, its heating performance was analyzed. Results indicate that the proposed system has good heating performance. The average COPs of TWSHP units and the system in the heating season are 7.08 and 4.41, respectively. Compared with gas-fired boiler, its carbon emission decreased by 62.53%. By using the TES system, the power consumption during valley period of power grid increases by 581.23%, realizing the goal of peak load shifting.
Keyword ：
Energy saving Energy saving Thermal energy storage Thermal energy storage Space heating Space heating Peak load shifting Peak load shifting Tail water source heat pump Tail water source heat pump
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| GB/T 7714 | Huang, Chengyang , Wei, Wenzhe , Sun, Yuying et al. Energy saving and peak load shifting performance of tail water source heat pump integrated with large-scale thermal storage pool space heating system in technology park [J]. | ENERGY CONVERSION AND MANAGEMENT , 2023 , 287 . |
| MLA | Huang, Chengyang et al. "Energy saving and peak load shifting performance of tail water source heat pump integrated with large-scale thermal storage pool space heating system in technology park" . | ENERGY CONVERSION AND MANAGEMENT 287 (2023) . |
| APA | Huang, Chengyang , Wei, Wenzhe , Sun, Yuying , Wang, Wei , Li, Zhaoyang , Wang, Shiquan et al. Energy saving and peak load shifting performance of tail water source heat pump integrated with large-scale thermal storage pool space heating system in technology park . | ENERGY CONVERSION AND MANAGEMENT , 2023 , 287 . |
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