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Modeling and Optimization of Solar Collector Design for the Improvement of Solar-Air Source Heat Pump Building Heating System
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作者 Jiarui Wu Yuzhen Kang Junxiao Feng 《Energy Engineering》 EI 2023年第12期2783-2802,共20页
To enhance system stability,solar collectors have been integrated with air-source heat pumps.This integration facilitates the concurrent utilization of solar and air as energy sources for the system,leading to an impr... To enhance system stability,solar collectors have been integrated with air-source heat pumps.This integration facilitates the concurrent utilization of solar and air as energy sources for the system,leading to an improvement in the system’s heat generation coefficient,overall efficiency,and stability.In this study,we focus on a residential building located in Lhasa as the target for heating purposes.Initially,we simulate and analyze a solar-air source heat pump combined heating system.Subsequently,while ensuring the system meets user requirements,we examine the influence of solar collector installation angles and collector area on the performance of the solar-air source heat pump dual heating system.Through this analysis,we determine the optimal installation angle and collector area to optimize system performance. 展开更多
关键词 Solar energy air source heat pump optimization model solar-air heat pump heating system
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Research on Operation Optimization of Heating System Based on Electric Storage Coupled Solar Energy and Air Source Heat Pump
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作者 Jingxiao Han Chuanzhao Zhang +5 位作者 LuWang ZengjunChang Qing Zhao Ying Shi JiaruiWu Xiangfei Kong 《Energy Engineering》 EI 2023年第9期1991-2011,共21页
For heating systems based on electricity storage coupled with solar energy and an air source heat pump(ECSA),choosing the appropriate combination of heat sources according to local conditions is the key to improving e... For heating systems based on electricity storage coupled with solar energy and an air source heat pump(ECSA),choosing the appropriate combination of heat sources according to local conditions is the key to improving economic efficiency.In this paper,four cities in three climatic regions in China were selected,namely Nanjing in the hot summer and cold winter region,Tianjin in the cold region,Shenyang and Harbin in the severe cold winter region.The levelized cost of heat(LCOH)was used as the economic evaluation index,and the energy consumption and emissions of different pollutants were analyzed.TRNSYS software was used to simulate and analyze the system performance.The Hooke-Jeeves optimization algorithm and GenOpt software were used to optimize the system parameters.The results showed that ECSA systemhad an excellent operation effect in cold region and hot summer and cold winter region.Compared with ECS system,the systemenergy consumption,and the emission of different pollutants of ECSA system can be reduced by a maximum of 1.37 times.In cold region,the initial investment in an air source heat pump is higher due to the lower ambient temperature,resulting in an increase in the LOCH value of ECSA system.After the LOCH value of ECSA system in each region was optimized,the heating cost of the system was reduced,but also resulted in an increase in energy consumption and the emission of different pollutant gases. 展开更多
关键词 Electric heat storage solar energy air source heat pump multi-objective optimization method LOCH
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Operating performance of novel reverse-cycle defrosting method based on thermal energy storage for air source heat pump 被引量:7
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作者 董建锴 姜益强 +1 位作者 姚杨 张雪丹 《Journal of Central South University》 SCIE EI CAS 2011年第6期2163-2169,共7页
To solve the fundamental problem of insufficient heat available during defrosting while ensuring the efficient and safe system operation for air-source heat pumps (ASHPs). A novel reverse-cycle defrosting (NRCD) metho... To solve the fundamental problem of insufficient heat available during defrosting while ensuring the efficient and safe system operation for air-source heat pumps (ASHPs). A novel reverse-cycle defrosting (NRCD) method based on thermal energy storage to eliminate frost off the outdoor coil surface was developed. Comparative experiments using both the stand reverse cycle defrosting (SRCD) method and the NRCD method were carried out on an experimental ASHP unit with a nominal 2.5 kW heating capacity. The results indicate that during defrosting operation, using the NRCD method improves discharge and suction pressures by 0.24 MPa and 0.19 MPa, respectively, shortens defrosting duration by 60%, and reduces the defrosting energy consumption by 48.1% in the experimental environment, compared with those by the use of SRCD method. Therefore, using the NRCD method can shorten the defrosting duration, improve the indoor thermal comfort, and reduce the defrosting energy consumption in defrosting. 展开更多
关键词 逆循环除霜 除霜方法 空气源热泵 热能储存 经营业绩 对比实验 持续时间 能源消耗
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Operation Performance of Air Source Heat Pump System for Space Heating in Tianjin 被引量:2
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作者 赵军 陈雁 +1 位作者 曲航 李新国 《Transactions of Tianjin University》 EI CAS 2007年第2期137-141,共5页
An air source heat pump system (ASHPS) used in an office building is set up and studied experimentally. Its operating performance in winter is evaluated based on test data and a comparative discussion is given on the ... An air source heat pump system (ASHPS) used in an office building is set up and studied experimentally. Its operating performance in winter is evaluated based on test data and a comparative discussion is given on the effect of climate conditions and heating load ratio on the operation behavior. Then heating capacity variation caused by evaporator frosting is analyzed as well. Finally, the defrosting parameters and the technical feasibility are studied for a constant heating demand. The experimental results indicate that both the outlet water temperature drop and the system COP should be taken into account when setting defrosting parameters, and ASHPS is a viable technology for space heating and hot-water production in winter in Tianjin, which can maintain the room temperature above 19 ℃ when the outdoor temperature is -2 ℃. 展开更多
关键词 天津 气源热泵系统 供暖 运行性能 除霜
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Refrigerant Control Strategies for Residential Air-Conditioning and Heat-Pump System 被引量:1
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作者 SU Shun-yu,ZHANG Chun-zhi,CHEN Jian(College of Urban Construction,Wuhan University of Science and Technology,Wuhan,Hubei 430070,China) 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2009年第S1期91-95,共5页
This paper simulated the optimal refrigerant charge inventory of a refrigeration system in air-conditioning operation and heat-pump operation respectively,and studied the refrigerant control strategies in this system.... This paper simulated the optimal refrigerant charge inventory of a refrigeration system in air-conditioning operation and heat-pump operation respectively,and studied the refrigerant control strategies in this system.The void fraction in two-phase fluid region was calculated by Harms model.And based on distributed parameter model and Harms model,the refrigerant charge inventory in condenser and evaporator were calculated and analyzed in air-conditioning conditions and heat-pump conditions,respectively.The calculating results of different refrigerant mass between refrigeration and heating conditions indicate that the optimal refrigerant charge inventory in heat-pump conditions is lower than that in air-conditioning conditions.To avoid the decrease of COP due to the surplus refrigerant in heating conditions,we introduced the liquid reservoir control method and associate capillary control method.Both of them could increase the heating capacity of the air-source heat pump.The difference of optimal refrigerant charge inventory in air-conditioning and heat-pump system can be controlled by the liquid reservoir or the associate capillary. 展开更多
关键词 air-source heat pump control strategy distributed PARAMETER model CHARGE INVENTORY
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Applicability of sewage heat pump air-conditioning system
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作者 陈金华 刘猛 +2 位作者 刘勇 靳鸣 陈洁 《Journal of Central South University》 SCIE EI CAS 2009年第S1期183-187,共5页
A sewage heat pump system and its application based on a project in Chongqing,China,were discussed. Based on the sewage conditions,a feasibility analysis of the sewage heat pump air conditioning system was conducted. ... A sewage heat pump system and its application based on a project in Chongqing,China,were discussed. Based on the sewage conditions,a feasibility analysis of the sewage heat pump air conditioning system was conducted. The theoretical and quantitative calculations indicate that sewage flux in the city sewage main pipe in the project can satisfy heat exchange requirements,and taking water from the pipes has relatively small influence on the pipe net in summer and winter. The sewage heat pump air-conditioning system can save 21.5% operating cost in one year,which is energy efficient and environmentally friendly. 展开更多
关键词 SEWAGE heat pump air conditioning system NUMERICAL calculation energy efficiency environmental FRIENDLINESS
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Simulation of Air Source Heat Pump with Refrigerant Injection for Heating Operation
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作者 Liu Haibo Shao Shuangquan +1 位作者 Ma Guoyuan Fan Boyuan 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2018年第5期739-748,共10页
An air source heat pump(ASHP)with refrigerant injection is proposed for the air conditioning system of electric vehicles(EVs),especially for efficient heating in cold winter,when there is no wasted heat of engines.The... An air source heat pump(ASHP)with refrigerant injection is proposed for the air conditioning system of electric vehicles(EVs),especially for efficient heating in cold winter,when there is no wasted heat of engines.The simulation model is built with the framework of two-phase fluid network,where the compressor is separated as two compressors and the economizer is treated as two heat exchangers in the injection path and the main refrigerant path.With the validated simulation model,the heating performance is analyzed,and the results show that the coefficient of performance(COP)of ASHP with refrigerant injection is higher than 1.4 and the discharge temperature is less than 100℃ when the outdoor temperature is-20℃.The above performance ensures that the air conditioning system and EVs can operate normally with high efficiency even in the cold winter,which is much helpful for the practicability of EVs. 展开更多
关键词 heat pump REFRIGERANT INJECTION air conditioning SIMULATION electric vehicle(EV)
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Study on corrosion behavior of heat exchanger in water source heat pump
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作者 刘作华 龙洋 +2 位作者 李百战 丁勇 周小霞 《化工进展》 EI CAS CSCD 北大核心 2010年第S1期695-698,共4页
Water source heat pump is a new kind of energy saving process.One of the most common problems for water source heat pump system is the corrosion of the copper in heat exchanger.The quality of water is the key factor.T... Water source heat pump is a new kind of energy saving process.One of the most common problems for water source heat pump system is the corrosion of the copper in heat exchanger.The quality of water is the key factor.The river water collected in six different places of the Yangtze River and Jialing River in Chongqing were analyzed.Various parameters(pH,coexisted ions,and hardness value)were investigated.It showed that the Yangtze River and Jialing River water was suitable for developing water source heat pump technology.Further more,aimed at the temperature and pH of the raw water's variation range in a year,the corrosion behavior of copper material was studied by controlling the water environmental condition.Corrosion rate of copper is accelerated at high temperature and lower pH value. 展开更多
关键词 water source heat pump water quality RIVER water corrosion
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Performance and Optimization of Air Source Heat Pump Water Heater with Cyclic Heating
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作者 李凡 陆高锋 +3 位作者 丁云霄 郑春元 李斌 翟晓强 《Journal of Shanghai Jiaotong university(Science)》 EI 2024年第2期179-187,共9页
A new type of microchannel condenser applied in the air source heat pump water heater(ASHPWH)with cyclic heating was proposed in this study.The operating performance of the ASHPWH was frst tested.Then,the structure of... A new type of microchannel condenser applied in the air source heat pump water heater(ASHPWH)with cyclic heating was proposed in this study.The operating performance of the ASHPWH was frst tested.Then,the structure of the microchannel condenser was optimized with the implement of vortex generators.Finally,a numerical model of the ASHPWH was established and the optimized microchannel condenser was studied.The experimental results showed that the average coefficient of performance(COP)of the 1HP(735 W)ASHPWH reached 3.48.In addition,the optimized microchannel condenser could be matched with a 3 HP(2430W)ASHPWH with an average heating capacity of 10.30 kW,and achieving an average COP of 4.24,14.6%higher than the limit value in the national standard. 展开更多
关键词 air source heat pump water heater(ASHPWH) cyclic heating MICROCHANNEL CONDENSER
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Optimization of Selecting Air Conditioning Cold/Heat Sources with Grey Relation Analysis
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作者 曹国庆 涂光备 《Transactions of Tianjin University》 EI CAS 2006年第3期229-234,共6页
寒冷 / 热采购的空气调节(交流) 的选择通常关于某些方面担心并且不能揭示这些问题的整个侧面。灰关系分析(GRA ) 是处理方法与不明确的信息在一个系统分类比较序列和某个引用顺序的关联程度的一个数据。它被用于从四个主要方面评估并... 寒冷 / 热采购的空气调节(交流) 的选择通常关于某些方面担心并且不能揭示这些问题的整个侧面。灰关系分析(GRA ) 是处理方法与不明确的信息在一个系统分类比较序列和某个引用顺序的关联程度的一个数据。它被用于从四个主要方面评估并且选择交流寒冷 / 热的来源,它是技术,经济,可靠性,和操作和管理。选择交流寒冷 / 热的结果与 GRA 方法采购的案例研究表演能是更合理的并且可使信服。因此,它在加热为设计者提供一条新途径,通气,比较并且评估不同 ACcold/heat 的空气调节地采购原料。 展开更多
关键词 空调 设计方案 灰色关联分析 评分因素 冷/热源
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Development of Instantaneous Hot Water Dispenser Based on Water Source Heat Pump
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作者 Satoshi Yoshida Ryozo Ooka +1 位作者 Toshiyuki Hino Kazuo Kodama 《Journal of Energy and Power Engineering》 2014年第10期1703-1711,共9页
关键词 水源热泵 饮水机 瞬间 性能系数 P系统 分配器 自然能源 能源消耗
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The Development Trend of Heat Pump Air Conditioning in Electric Vehicle
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作者 Qin Xiao-dong 《课程教育研究(学法教法研究)》 2016年第23期2-3,共2页
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Energy Efficient Air Conditioning System Using Geothermal Cooling-Solar Heating in Gujarat, India 被引量:1
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作者 Sneha Shahare T. Harinarayana 《Journal of Power and Energy Engineering》 2016年第1期57-71,共15页
It is well known that one unit of electrical energy saved is equal to more than two units produced. One way of economizing the power is utilization of energy efficient systems at all locations. In the present study, t... It is well known that one unit of electrical energy saved is equal to more than two units produced. One way of economizing the power is utilization of energy efficient systems at all locations. In the present study, the air conditioning system is analysed and an innovative way is suggested. We use natural low temperature of shallow sub surface (1 - 3 m) of the earth—geothermal cooling system. It is known that majority of the households and the apartment complexes in India have two tanks for water storage. One is the underground water sump and the other is the overhead water tank. In our study, we use these two water storage systems for space cooling during summer and also for heating during winter. The main aim of our paper is air-conditioning of the space in an economic way to save electricity. It is based on a simple idea of transferring the low temperature from underground water sump to the room in the house using water as a mode of transport. Since India is a tropical country located at low latitude, most of the year, the air temperature is high and demands space cooling. However, for a couple of months during severe winter months (Dec.-Jan.) at Ahmedabad, heating of the space is required. For heating the space, we suggest to use the well-known solar water heater. Effective use of heat exchanger is shown through computation, modelling schemes and lab experiment. We recommend geothermal cooling for 10 months in a year and solar hot water system during 2 months of winter. It is observed that the ambient air temperature of 35°C - 40°C in the room can be brought down to 26°C without much consumption of electricity. In a similar manner, the room temperature at night (13°C) during winter in Ahmedabad can be increased to 27°C through circulation of water from solar water heater in the heat exchanger. 展开更多
关键词 Energy Efficiency Geothermal Cooling air conditioning CFD Thermal Comfort Earth water heat Exchanger
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STUDY OF THE HEAT AND HUMIDITY TRANSFER PROCESSES BETWEEN AIR AND WATER IN THE AIR WASHER
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作者 刘刚 《Journal of China Textile University(English Edition)》 EI CAS 1997年第1期49-53,共5页
The processes of heat and humidity transfer between air and water are what to be studied mainly in the paper, we put forward some main factors which influence the processes of heat and humidity transfer in the air was... The processes of heat and humidity transfer between air and water are what to be studied mainly in the paper, we put forward some main factors which influence the processes of heat and humidity transfer in the air washer. We come to the conclusion that we can change these main factors to achieve different heat and humidity transfer processes and decide processes of heat and humidity transfer of air and water with the initial temperature of spraying water in the air washer. All these results can make things convenient for the air conditioning management. 展开更多
关键词 air WASHER the processes of heat and humidity transfer water-air ratio the initialstate of the air the initial temperature of SPRAYING water air conditioning water droplet.
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Feasibility Analysis of Back-Pressure Steam Feeding Water Pump for Direct Air-Cooled Unit 被引量:1
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作者 Zhao Xiaodong Wang Meng +2 位作者 Du Xiaoze Yang Lijun Yang Yongping 《Electricity》 2013年第1期31-35,共5页
As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introd... As the performance of an air-cooled condenser is apt to be affected by the fluctuating ambient condition, some difficulties are brought to the use of a steam feeding water pump in an air-cooled unit. This paper introduces a new design of for steam feeding the water pump of an air-cooled unit using the back-pressure steam turbine as the prime motor. Using variable condition analysis on a 600 MW direct air-cooled unit, and with consideration of the effect on the ambient conditions, the feasibility, economy, and adaptability of the design are verified. 展开更多
关键词 直接空冷机组 给水泵 蒸汽 背压 风冷式冷凝器 变工况分析 空气冷却 汽轮机
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Thermodynamic Simulation of CCP in Air-Cooled Heat Pump Unit with HFCs and CO<sub>2</sub>Trans-Critical 被引量:2
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作者 Feihu Chen Shuguang Liao Guangcai Gong 《Journal of Power and Energy Engineering》 2018年第9期141-164,共24页
The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit ... The exergy analysis and finite time thermodynamic methods had been employed to analyze the compound condensation process (CCP). It was based on the air-cooling heat pump unit. The cooling capacity of the chiller unit is about 1 kW, and the work refrigerant is R22/R407C/R410A/CO2. The MATLAB/SIMULINK software was employed to build the simulation model. The thermodynamic simulation model is significant for the optimization of parameters of the unit, such as condensation and evaporation temperature and mass flow of the sanitary hot water and size of hot water storage tank. The COP of the CCP of R410A system is about 3% - 5% higher than the CCP of the R22 system, while CCP of the R407C system is a little lower than the CCP of R22 system. And the CCP of CO2 trans-critical system has advantage in the hot supply mode. The simulation method provided a theoretical reference for developing the production of CCP with substitute refrigerant R407C/R410A/CO2. 展开更多
关键词 air-Cooled heat pump Unit Compound Condensation Process (CCP) EXERGY Analysis Method Sanitary Hot water MATLAB/SIMULINK Software Fluorine Substitute REFRIGERANT R407C/R410A Natural REFRIGERANT CO2
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Experimental Study of Energy-Saving Air-Conditioner with Hot Water
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作者 CHEN Jian-bo,CHEN Dan,LU Ying(University of Shanghai for Science and Technology,Shanghai,China) 《湖南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2009年第S1期75-78,共4页
Energy-saving air-conditioner with hot water is an air source heat pump air-conditioner,which can also supply hot water.The hot water is heated by a double pipe condenser connected with an air-cooled condenser in seri... Energy-saving air-conditioner with hot water is an air source heat pump air-conditioner,which can also supply hot water.The hot water is heated by a double pipe condenser connected with an air-cooled condenser in series in the system.This experiment of the energy-saving air-conditioner was carried out in the enthalpy-difference air-conditioner laboratory.The hot water temperature and the compressor's discharge and suction pressure were recorded in the working condition,where the ambient temperature was at 43 ℃,35 ℃,21 ℃,7 ℃,and 2 ℃ separately.The results showed that the system operated stably and reliably.This system can supply 240 L hot water at 50 ℃ in the whole year,and its coefficience of performance(COP)is much higher than the conventional air source heat pump system.Its energy conservation was proved by comparing the thermal efficiency with other sourece water heaters. 展开更多
关键词 air-conditioning water heatERS energy CONSERVATION heat pump systems thermal efficiency
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新型低GWP制冷剂在-100~200℃的应用研究进展
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作者 张迪 郭智恺 +4 位作者 于万金 卢朋 刘瑶瑶 刘武灿 张建君 《制冷学报》 CAS CSCD 北大核心 2024年第3期23-37,共15页
制冷剂是蒸气压缩循环中必不可少的工作流体,氢氟烷烃类化合物是目前制冷、空调和热泵设备中的主要制冷剂,但该类制冷剂会引起全球变暖等问题,因此亟需开发应用性能相似、环境性能友好的新型制冷剂。介绍了不同制冷剂在-100~200℃蒸气... 制冷剂是蒸气压缩循环中必不可少的工作流体,氢氟烷烃类化合物是目前制冷、空调和热泵设备中的主要制冷剂,但该类制冷剂会引起全球变暖等问题,因此亟需开发应用性能相似、环境性能友好的新型制冷剂。介绍了不同制冷剂在-100~200℃蒸气压缩循环应用场景中的使用现状,并综述了具有前景的低GWP制冷剂替代方案研究进展;在此基础上,对HFO-1234yf、HFO-1234ze(E)、HFO-1234ze(Z)、HCFO-1233zd(E)、HFO-1336mzz(Z) 5种低GWP制冷剂在实际应用系统中的最新研究及关键问题进行总结。 展开更多
关键词 制冷剂 空调 热泵 有机朗肯循环 GWP
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基于ANFIS的太阳能-空气源热泵供暖系统温度控制研究
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作者 谭心 吴林锋 +3 位作者 虞启辉 刘泽江 王亚辉 孙国鑫 《太阳能学报》 EI CAS CSCD 北大核心 2024年第2期16-22,共7页
针对太阳能-空气源热泵供暖系统运行环境复杂多变,模糊控制器的设计高度依赖人工经验的问题,提出一种基于自适应神经模糊推理系统(ANFIS)改进的模糊控制方法。该方法利用ANFIS在复杂系统建模中的优势,结合供暖系统温度响应特性和实际运... 针对太阳能-空气源热泵供暖系统运行环境复杂多变,模糊控制器的设计高度依赖人工经验的问题,提出一种基于自适应神经模糊推理系统(ANFIS)改进的模糊控制方法。该方法利用ANFIS在复杂系统建模中的优势,结合供暖系统温度响应特性和实际运行数据,建立联合供暖系统变工况ANFIS模型,生成与系统性能适配的模糊规则库并传递给模糊控制器执行。Matlab/Simulink仿真对比试验表明,与单一的模糊控制相比,该方法的控制精度提高了17.65%,调节时间缩短了36.4%,具有更高的控制精度和响应速度。 展开更多
关键词 太阳能 空气源热泵 联合供暖 模糊控制 温度控制 ANFIS
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太阳能-空气源热泵牧草干燥系统制热性能研究
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作者 钱珊珠 杨海巍 +5 位作者 郭文斌 钱丹珠 张清杨 王振彬 屠旭杰 黄长华 《农机化研究》 北大核心 2024年第2期235-241,共7页
以太阳能-空气源热泵牧草干燥系统为研究对象,通过系统不同工作模式的温升、恒温制热试验及带载试验,分析了温升速率、单位温升能耗、COP及除湿效率。研究结果表明:联合制热模式与太阳能单独制热相比,单位温升耗电量降低了86.2%,温升速... 以太阳能-空气源热泵牧草干燥系统为研究对象,通过系统不同工作模式的温升、恒温制热试验及带载试验,分析了温升速率、单位温升能耗、COP及除湿效率。研究结果表明:联合制热模式与太阳能单独制热相比,单位温升耗电量降低了86.2%,温升速率提高了99~112倍。联合制热模式与热泵单独制热试验相比,在温升过程中温升速率降低了7.7%~17.6%,单位温升耗电量降低8.0%;在恒温制热过程中,前者COP比后者提高了6.5%~11.1%,耗电量降低了5.8%~10.7%;在升温制热过程中前者COP比后者提高了6.0%~10.4%,耗电量降低了6.6%~11.1%。联合干燥模式比热泵单独干燥模式的SMER值高19.8%~36.2%。 展开更多
关键词 牧草 太阳能—空气源热泵 干燥系统 制热性能
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