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Two schemes of power and refrigeration cogeneration Kalina cycle with adjustable refrigeration temperature (PPRAT-KC) based on the efficient cogeneration cycle PPR-KC are proposed and studied. In the PPRAT-KC, the refrigerant vapor is absorbed in a pressure adjustment absorber with dilute solution either from the separator or the low-pressure pump, and by altering the flow rate of the dilute solution, the refrigeration temperature is able to be adjusted with nearly no effect on the amounts of energy outputs. The amount of net power or refrigeration capacity in the PPRAT-KC can be also adjusted by changing the flow rate of solutions fed to the power and refrigeration sub-cycles. Under temperatures of heat source and cooling water of 400℃ and 30℃, respectively, the change range of refrigeration temperature for the two schemes of the PPRAT-KC are about from -22℃ to 7.5℃, and the performances of the two schemes are similar. With the same work concentration of 0.5 and refrigeration temperature of -15℃, the effective exergy of PPRAT-KC is 0.5653, which is 4.145% and 10.97% higher than those of the PPR-KC and the triple pressure Kalina cycle, respectively.
Shaobo Zhang; Xiaoli Hao; Yaping Chen; Jiafeng Wu. Thermodynamic study on power and refrigeration cogeneration Kalina cycle with adjustable refrigeration temperature. International Journal of Refrigeration 2021, 1 .
AMA StyleShaobo Zhang, Xiaoli Hao, Yaping Chen, Jiafeng Wu. Thermodynamic study on power and refrigeration cogeneration Kalina cycle with adjustable refrigeration temperature. International Journal of Refrigeration. 2021; ():1.
Chicago/Turabian StyleShaobo Zhang; Xiaoli Hao; Yaping Chen; Jiafeng Wu. 2021. "Thermodynamic study on power and refrigeration cogeneration Kalina cycle with adjustable refrigeration temperature." International Journal of Refrigeration , no. : 1.
Evaporative cooling is an energy efficient and environmentally friendly cooling technology and has been widely used for indoor air conditioning in hot and arid climate regions. In order to apply evaporative cooling technology to hot and semiarid climate regions, an integrated system, which combined indirect evaporative cooling and variable refrigerant flow (VRF) technologies, was proposed. In the proposed system, cold water produced by indirect evaporative chiller (IECh) is firstly used to cool the fresh air and then used as cooling water for a water-cooled VRF system. To investigate the feasibility and its energy saving potential of the proposed system in hot and semiarid climate regions, a mathematical model was developed and a simulation program was developed. The energy performance of the system during the cooling season is evaluated in a typical office building in Turpan of China. Results show that the proposed system has a seasonal energy efficiency ratio (SEER) of 7.48. Compared with conventional air-cooled VRF system, the proposed system can help to reduce energy consumption by approximately 35%. Therefore, it is feasible to apply the proposed system for indoor climate control in hot and semiarid climate regions with remarkable energy savings.
Ke Yang; Xiaoli Hao; Yaolin Lin; Qingwei Xing; Hang Tan; Jinhua Hu; Xianping Liu. An integrated system of water-cooled VRF and indirect evaporative chiller and its energy saving potential. Applied Thermal Engineering 2021, 194, 117063 .
AMA StyleKe Yang, Xiaoli Hao, Yaolin Lin, Qingwei Xing, Hang Tan, Jinhua Hu, Xianping Liu. An integrated system of water-cooled VRF and indirect evaporative chiller and its energy saving potential. Applied Thermal Engineering. 2021; 194 ():117063.
Chicago/Turabian StyleKe Yang; Xiaoli Hao; Yaolin Lin; Qingwei Xing; Hang Tan; Jinhua Hu; Xianping Liu. 2021. "An integrated system of water-cooled VRF and indirect evaporative chiller and its energy saving potential." Applied Thermal Engineering 194, no. : 117063.
This paper proposed an optimization method to minimize the building energy consumption and visual discomfort for a passive building in Shanghai, China. A total of 35 design parameters relating to building form, envelope properties, thermostat settings, and green roof configurations were considered. First, the Latin hypercube sampling method (LHSM) was used to generate a set of design samples, and the energy consumption and visual discomfort of the samples were obtained through computer simulation and calculation. Second, four machine learning prediction models, including stepwise linear regression (SLR), back-propagation neural networks (BPNN), support vector machine (SVM), and random forest (RF) models, were developed. It was found that the BPNN model performed the best, with average absolute relative errors of 3.27% and 1.25% for energy consumption and visual comfort, respectively. Third, six optimization algorithms were selected to couple with the BPNN models to find the optimal design solutions. The multi-objective ant lion optimization (MOALO) algorithm was found to be the best algorithm. Finally, optimization with different groups of design variables was conducted by using the MOALO algorithm with the associated outcomes being analyzed. Compared with the reference building, the optimal solutions helped reduce energy consumption up to 34.8% and improved visual discomfort up to 100%.
Yaolin Lin; Luqi Zhao; Xiaohong Liu; Wei Yang; Xiaoli Hao; Lin Tian. Design Optimization of a Passive Building with Green Roof through Machine Learning and Group Intelligent Algorithm. Buildings 2021, 11, 192 .
AMA StyleYaolin Lin, Luqi Zhao, Xiaohong Liu, Wei Yang, Xiaoli Hao, Lin Tian. Design Optimization of a Passive Building with Green Roof through Machine Learning and Group Intelligent Algorithm. Buildings. 2021; 11 (5):192.
Chicago/Turabian StyleYaolin Lin; Luqi Zhao; Xiaohong Liu; Wei Yang; Xiaoli Hao; Lin Tian. 2021. "Design Optimization of a Passive Building with Green Roof through Machine Learning and Group Intelligent Algorithm." Buildings 11, no. 5: 192.
About one-third of the primary energy in the world is consumed by buildings. A large amount of CO2 emission due to building energy consumption has threatened the sustainable development of the world. Improvement on the building energy performance, especially by integration with renewable energy resources has attracted interest worldwide to reduce greenhouse gas emission to make our society more sustainable. This Special Issue on building integrated renewable energy was open to all contributors in the field of building energy efficiency. The original experimental studies, numerical simulations, and reviews in all aspects of renewable energy utilization, management, and optimization have been considered. In the event, all these topics were covered in the extensive submissions accepted, but interesting papers on other aspects of building energy efficiency were also received. The purpose of this editorial is to summarize the main research findings of accepted papers in this Special Issue, including the use of renewable energy and energy saving technologies in buildings and identify a number of research questions and research directions.
Yaolin Lin; Wei Yang; Xiaoli Hao; Changxiong Yu. Building integrated renewable energy. Energy Exploration & Exploitation 2020, 39, 603 -607.
AMA StyleYaolin Lin, Wei Yang, Xiaoli Hao, Changxiong Yu. Building integrated renewable energy. Energy Exploration & Exploitation. 2020; 39 (2):603-607.
Chicago/Turabian StyleYaolin Lin; Wei Yang; Xiaoli Hao; Changxiong Yu. 2020. "Building integrated renewable energy." Energy Exploration & Exploitation 39, no. 2: 603-607.
Zero-energy buildings have attracted interest worldwide as they consume less energy and can alleviate energy shortages caused by rapid economic development. This paper presents a review of the research and development regarding zero-energy buildings in China. First, it briefly introduces the evolution of the definition of zero-energy buildings and discusses the key influencing factors of such buildings in China. Then, envelope design, selection of mechanical and electrical equipment, and solar energy utilization aspects of zero-energy buildings are examined. Additionally, this paper discusses the development and application of zero-energy buildings in China, including project types, design methods, energy resources allocation, and energy operation management. Finally, this paper analyzes China’s policies for zero-energy buildings, including incentive mechanisms, laws and regulations, and problems encountered, and provides suggestions for promoting zero-energy buildings in China. We expect this review to identify gaps and future directions for research and development, which will lead to new technologies, methods, policies, and standards that can be applied to zero-energy buildings.
Yaolin Lin; Shengli Zhong; Wei Yang; Xiaoli Hao; Chun-Qing Li. Towards zero-energy buildings in China: A systematic literature review. Journal of Cleaner Production 2020, 276, 123297 .
AMA StyleYaolin Lin, Shengli Zhong, Wei Yang, Xiaoli Hao, Chun-Qing Li. Towards zero-energy buildings in China: A systematic literature review. Journal of Cleaner Production. 2020; 276 ():123297.
Chicago/Turabian StyleYaolin Lin; Shengli Zhong; Wei Yang; Xiaoli Hao; Chun-Qing Li. 2020. "Towards zero-energy buildings in China: A systematic literature review." Journal of Cleaner Production 276, no. : 123297.
Over the last decade, the influences of vertical greenery systems (VGSs) and green roofs (GRs) on indoor air temperature, surface temperature of walls, and energy consumption have been widely investigated. There is little information on how VGSs and GRs influence the indoor operative temperature of an air-conditioned space, even though it is a measure of human thermal comfort. This study experimentally investigates the effects of VGS and GR on indoor operative temperatures. Two experimental rooms, one equipped with VGS and GR and the other without, are constructed in Xiangtan, China, which is located in the hot summer and cold winter climate zone. The rooms are controlled using identical indoor air temperature set-points. During the experiments in summer 2018, the indoor and outdoor thermal environmental parameters were measured and recorded automatically. The results indicate that the operative temperature of the room with VGS and GR was reduced by 0.4 °C on average and a maximum of 2.1 °C compared to the room without VGS and GR. The impact of VGS and GR on the operative temperature in the daytime is greater than at night. In addition, the VGS and GR also decrease the oscillation of the operative temperature, and a more stable thermal environment can be achieved with VGS and GR. A computer program was developed using EnergyPlus, and the results were validated using experimental data. By performing computer simulations during the whole cooling season (from June 1 to September 30), it was found that the operative temperature of the room with VGS and GR was reduced by 0.59–0.65 °C during the daytime (7:00 a.m.–7:00 p.m.) and remained almost unchanged at night. Further, the set-point temperature of the room with VGS and GR can be 0.76–0.84 °C higher than that of the room without VGS and GR in the daytime to maintain the same level of thermal comfort. An energy saving correction from 7% to 8% on the daytime energy consumption is proposed with this increased set-point temperature.
Xiaoli Hao; Qingwei Xing; Pinhan Long; Yaolin Lin; Jinhua Hu; Hang Tan. Influence of vertical greenery systems and green roofs on the indoor operative temperature of air-conditioned rooms. Journal of Building Engineering 2020, 31, 101373 .
AMA StyleXiaoli Hao, Qingwei Xing, Pinhan Long, Yaolin Lin, Jinhua Hu, Hang Tan. Influence of vertical greenery systems and green roofs on the indoor operative temperature of air-conditioned rooms. Journal of Building Engineering. 2020; 31 ():101373.
Chicago/Turabian StyleXiaoli Hao; Qingwei Xing; Pinhan Long; Yaolin Lin; Jinhua Hu; Hang Tan. 2020. "Influence of vertical greenery systems and green roofs on the indoor operative temperature of air-conditioned rooms." Journal of Building Engineering 31, no. : 101373.
As a new type of greening method, vertical greening can not only solve the problems of shrinking green space, poor air quality, reduce the heat island effect on urbanization, but also affect the annual building energy consumption. In this paper, the energy saving potential of vertical greening in China’s hot summer and cold winter regions is investigated through comparative experiments between a vertical greening room and a reference room. During winter, the total power consumption of the reference room is 1.22 times that of the vertical greening room. The energy saving rate of the vertical greening system is concluded to be approximately 18%. During summer, the total power consumption of the reference room is 1.33 times that of the vertical greening room. The energy saving rate of the vertical greening is approximately 25%.
Hang Tan; Zhuoyu Yang; Xiaoli Hao; Qingwei Xing; Yaolin Lin; Xianping Liu; Jinhua Hu. Investigation on Energy Saving Potential of a Vertical Greening System in Hot Summer and Cold Winter Areas in China. Soil and Recycling Management in the Anthropocene Era 2020, 1277 -1283.
AMA StyleHang Tan, Zhuoyu Yang, Xiaoli Hao, Qingwei Xing, Yaolin Lin, Xianping Liu, Jinhua Hu. Investigation on Energy Saving Potential of a Vertical Greening System in Hot Summer and Cold Winter Areas in China. Soil and Recycling Management in the Anthropocene Era. 2020; ():1277-1283.
Chicago/Turabian StyleHang Tan; Zhuoyu Yang; Xiaoli Hao; Qingwei Xing; Yaolin Lin; Xianping Liu; Jinhua Hu. 2020. "Investigation on Energy Saving Potential of a Vertical Greening System in Hot Summer and Cold Winter Areas in China." Soil and Recycling Management in the Anthropocene Era , no. : 1277-1283.
During the production process in mines, large amounts of dusts are produced. The dusts pose a potential hazard to the health and safety of miners. Traditional dust removal methods, such as ventilation, water sprays and foam technology, cannot completely solve the problem of dust pollution, due to low efficiency or high consumption of water or large resistance (>2000 Pa). Therefore, a swirling curtain dust collector (SCDC) was proposed to collect the dust in mines. The device was combined swirling atomization with spray curtain for dust removal. The performance of SCDC was investigated. According to the results, the optimum working condition of the device was: air pressure: 0.35 MPa, water volume: 30 L/h; liquid–gas ratio: 0.15 L/m3; air speed: 14–16 m/s. Under these operation parameters, the suppression efficiency of total dust and respirable dust were over 99.8% and 97%. The proposed device was applied at transfer stations of Luohe Metal Mine in Anhui, China. The application results showed that the dust concentration at the outlet of SCDC in the transfer station is lower than 20 mg/m3, which is stipulated by Chinese standard GB 28661-2012. The proposed device is expected to replace the traditional Venturi wet scrubber in mines.
Gang Li; Jinhua Hu; Xiaoli Hao; Huaidi Qu. Application and Research of Swirling Curtain Dust Collection Technology in Mines. Applied Sciences 2020, 10, 2005 .
AMA StyleGang Li, Jinhua Hu, Xiaoli Hao, Huaidi Qu. Application and Research of Swirling Curtain Dust Collection Technology in Mines. Applied Sciences. 2020; 10 (6):2005.
Chicago/Turabian StyleGang Li; Jinhua Hu; Xiaoli Hao; Huaidi Qu. 2020. "Application and Research of Swirling Curtain Dust Collection Technology in Mines." Applied Sciences 10, no. 6: 2005.
In China, rapid urbanization brought about the problems of increased building energy consumption and decreased area of green space as well as poor air quality and heat island effect. Building envelope integrated green plants (BIGP), which is also called as vertical greening, is regarded as the potential solution to the energy and environmental issues. This article verifies and analyzes the energy saving potential of BIGP in China's hot summer and cold winter regions through comparative experiments between a vertical greening room and a reference room. The winter time experiment was carried out from December 2017 to January 2018, and the summer time experiment was from July to August 2018. During winter, the heat flux density of the exterior wall is reduced by 3.11 W/m2 with BIGP, and the hourly power consumption of the reference room is 1.22 times that of the room with BIGP. The energy saving rate of BIGP is approximately 18%. During summer, the heat flux density of the exterior wall of the reference room is 4.15 W/m2 larger than that of the vertical green room and the hourly power consumption is 1.33 times that of the vertical greening room. The energy saving rate of BIGP is about 25%.
Hang Tan; Xiaoli Hao; Pinhan Long; Qingwei Xing; Yaolin Lin; Jinhua Hu. Building envelope integrated green plants for energy saving. Energy Exploration & Exploitation 2019, 38, 222 -234.
AMA StyleHang Tan, Xiaoli Hao, Pinhan Long, Qingwei Xing, Yaolin Lin, Jinhua Hu. Building envelope integrated green plants for energy saving. Energy Exploration & Exploitation. 2019; 38 (1):222-234.
Chicago/Turabian StyleHang Tan; Xiaoli Hao; Pinhan Long; Qingwei Xing; Yaolin Lin; Jinhua Hu. 2019. "Building envelope integrated green plants for energy saving." Energy Exploration & Exploitation 38, no. 1: 222-234.
In recent years, a novel vertical greening system has begun to spread worldwide. This system can provide several environmental benefits, such as alleviating urban heat island effects, increasing the number of green sceneries, improving atmospheric quality, relieving urban drainage pressures, and improving building energy efficiency. To evaluate the effect of a vertical greening system on indoor climate and the energy consumption of buildings under wet and cold climatic conditions during winter, contrastive experiments were performed in this study. Two experimental rooms of equal size with the same wall structures were set up in Hunan Province, China. One room had a vertical greening system, whereas the other room did not have one and was used as the reference room. Two types of experimental conditions, that is, with and without heating, were investigated. The experimental data were collected from December, 2017, to January, 2018. Results showed that without heating, the indoor air temperature swing of the room with vertical greening was significantly suppressed, in comparison with that of the reference room. The indoor air temperature of the room with vertical greening was 1–3°C higher than that of the reference room at night. Meanwhile, the air layer temperature was 1–2°C higher than that of the outdoor air throughout the day. Under heating conditions, the average heat flux through the walls of the reference room was 3.1 W/m2 larger than that of the room with vertical greening. The measured electric energy consumption of the reference room was 1.22 times that of the vertical green room. An energy saving rate of 18% was achieved during the heating experiment owing to the extra thermal insulation provided by the vertical greening system.
Qingwei Xing; Xiaoli Hao; Yaolin Lin; Hang Tan; Ke Yang. Experimental investigation on the thermal performance of a vertical greening system with green roof in wet and cold climates during winter. Energy and Buildings 2018, 183, 105 -117.
AMA StyleQingwei Xing, Xiaoli Hao, Yaolin Lin, Hang Tan, Ke Yang. Experimental investigation on the thermal performance of a vertical greening system with green roof in wet and cold climates during winter. Energy and Buildings. 2018; 183 ():105-117.
Chicago/Turabian StyleQingwei Xing; Xiaoli Hao; Yaolin Lin; Hang Tan; Ke Yang. 2018. "Experimental investigation on the thermal performance of a vertical greening system with green roof in wet and cold climates during winter." Energy and Buildings 183, no. : 105-117.
Minhua Huang; Xiaoli Hao; Cong Li. Heat and Mass Transfer of Evaporative Wall and Its Cooling Load Calculation. Procedia Engineering 2017, 205, 2762 -2770.
AMA StyleMinhua Huang, Xiaoli Hao, Cong Li. Heat and Mass Transfer of Evaporative Wall and Its Cooling Load Calculation. Procedia Engineering. 2017; 205 ():2762-2770.
Chicago/Turabian StyleMinhua Huang; Xiaoli Hao; Cong Li. 2017. "Heat and Mass Transfer of Evaporative Wall and Its Cooling Load Calculation." Procedia Engineering 205, no. : 2762-2770.
Movable refuge chambers are a new kind of rescue device for underground mining, which is believed to have a potential positive impact on reducing the rate of fatalities. It is likely to be hot and humid inside a movable refuge chamber due to the metabolism of trapped miners, heat generated by equipment and heat transferred from outside. To investigate the heat stress experienced by miners trapped in a movable refuge chamber, the predicted heat strain (PHS) model was used to simulate the heat transfer process between the person and the thermal environment. The variations of heat stress with the temperature and humidity inside the refuge chamber were analyzed. The effects of air temperature outside the refuge chamber and the overall heat transfer coefficient of the refuge chamber shell on the heat stress inside the refuge chamber was also investigated. The relationship between the limit of exposure duration and the air temperature and humidity was numerically analyzed to determine the upper limits of temperature and humidity inside a refuge chamber. Air temperature of 32 °C and relative humidity of 70% are recommended as the design standard for internal thermal environment control of movable refuge chambers.
Xiaoli Hao; Chenxin Guo; Yaolin Lin; Haiqiao Wang; Heqing Liu. Analysis of Heat Stress and the Indoor Climate Control Requirements for Movable Refuge Chambers. International Journal of Environmental Research and Public Health 2016, 13, 518 .
AMA StyleXiaoli Hao, Chenxin Guo, Yaolin Lin, Haiqiao Wang, Heqing Liu. Analysis of Heat Stress and the Indoor Climate Control Requirements for Movable Refuge Chambers. International Journal of Environmental Research and Public Health. 2016; 13 (5):518.
Chicago/Turabian StyleXiaoli Hao; Chenxin Guo; Yaolin Lin; Haiqiao Wang; Heqing Liu. 2016. "Analysis of Heat Stress and the Indoor Climate Control Requirements for Movable Refuge Chambers." International Journal of Environmental Research and Public Health 13, no. 5: 518.
In order to evaluate and improve the performance of a ground-coupled heat pump (GCHP) heating system with radiant floors as terminals, an exergy analysis based on test results is performed in this study. The system is divided into four subsystems, and the exergy loss and exergy efficiency of each subsystem are calculated using the expressions derived based on exergy balance equations. The average values of the measured parameters are used for the exergy analysis. The analysis results show that the two largest exergy losses occur in the heat pump and terminals, with losses of 55.3% and 22.06%, respectively, and the lowest exergy efficiency occurs in the ground heat exchange system. Therefore, GCHP system designers should pay close attention to the selection of heat pumps and terminals, especially in the design of ground heat exchange systems. Compared with the scenario system in which fan coil units (FCUs) are substituted for the radiant floors, the adoption of radiant floors can result in a decrease of 12% in heating load, an increase of 3.24% in exergy efficiency of terminals and an increase of 1.18% in total exergy efficiency of the system. The results may point out the direction and ways of optimizing GCHP systems.
Xiao Chen; Xiaoli Hao. Exergy Analysis of a Ground-Coupled Heat Pump Heating System with Different Terminals. Entropy 2015, 17, 2328 -2340.
AMA StyleXiao Chen, Xiaoli Hao. Exergy Analysis of a Ground-Coupled Heat Pump Heating System with Different Terminals. Entropy. 2015; 17 (4):2328-2340.
Chicago/Turabian StyleXiao Chen; Xiaoli Hao. 2015. "Exergy Analysis of a Ground-Coupled Heat Pump Heating System with Different Terminals." Entropy 17, no. 4: 2328-2340.
Xiaoli Hao; Cangzhou Zhu; Yaolin Lin; Haiqiao Wang; Guoqiang Zhang; Youming Chen. Optimizing the pad thickness of evaporative air-cooled chiller for maximum energy saving. Energy and Buildings 2013, 61, 146 -152.
AMA StyleXiaoli Hao, Cangzhou Zhu, Yaolin Lin, Haiqiao Wang, Guoqiang Zhang, Youming Chen. Optimizing the pad thickness of evaporative air-cooled chiller for maximum energy saving. Energy and Buildings. 2013; 61 ():146-152.
Chicago/Turabian StyleXiaoli Hao; Cangzhou Zhu; Yaolin Lin; Haiqiao Wang; Guoqiang Zhang; Youming Chen. 2013. "Optimizing the pad thickness of evaporative air-cooled chiller for maximum energy saving." Energy and Buildings 61, no. : 146-152.
A thermodynamic model was developed to analyze the performance of cogeneration plant based on irreversible recuperative Brayton cycle. A parameter, dimensionless total useful energy rate (DTUER), was used as the criterion for performance optimization of cogeneration plant. The effects of cycle parameters, internal irreversibilities, and recuperator efficiency on maximum DTUER and on the efficiency at maximum DTUER were numerically investigated. The relation between DTUER and cogeneration efficiency was also analyzed. The results show that there exists an optimal compressor pressure ratio which maximizes the DTUER. It is also found that there exists an optimal power-to-heat ratio which results in a dual-maximum DTUER.
Xiao-Li Hao; Guo-Qiang Zhang. Maximum useful energy rate and efficiency of a recuperative Brayton cogeneration plant. Journal of Central South University 2013, 20, 156 -163.
AMA StyleXiao-Li Hao, Guo-Qiang Zhang. Maximum useful energy rate and efficiency of a recuperative Brayton cogeneration plant. Journal of Central South University. 2013; 20 (1):156-163.
Chicago/Turabian StyleXiao-Li Hao; Guo-Qiang Zhang. 2013. "Maximum useful energy rate and efficiency of a recuperative Brayton cogeneration plant." Journal of Central South University 20, no. 1: 156-163.
An endoreversible Joule-Brayton cogeneration cycle has been optimized with fuel energy saving as an assessment criterion. The effects of power-to-heat ratio, cycle temperature ratio, and user temperature ratio on maximum fuel energy saving and efficiency at maximum fuel energy saving have been investigated. Result shows that the maximum fuel energy saving still has maximum with respect to power-to-heat ratio. For given cycle and user temperature ratios, the optimal power-to-heat ratio has been numerically determined.
Xiaoli Hao; Guoqiang Zhang. Maximum Fuel Energy Saving of a Brayton Cogeneration Cycle. 2009 International Conference on Energy and Environment Technology 2009, 1, 724 -727.
AMA StyleXiaoli Hao, Guoqiang Zhang. Maximum Fuel Energy Saving of a Brayton Cogeneration Cycle. 2009 International Conference on Energy and Environment Technology. 2009; 1 ():724-727.
Chicago/Turabian StyleXiaoli Hao; Guoqiang Zhang. 2009. "Maximum Fuel Energy Saving of a Brayton Cogeneration Cycle." 2009 International Conference on Energy and Environment Technology 1, no. : 724-727.
An endoreversible Brayton cycle-based cogeneration plant has been optimised based on the dimensionless total exergy output rate criterion with a constraint on power-to-heat ratio. An optimal pressure ratio parameter and the maximum dimensionless total exergy output rate have been numerically determined. The optimisation results have been compared with those based on the total useful energy rate criterion. It shows that a cogeneration plant based on the maximum total exergy output rate criterion has higher total exergy output rate and smaller pressure ratio while lower exergy efficiency than that based on the maximum total useful energy rate criterion.
Xiaoli Hao; Guoqiang Zhang. Exergy optimisation of a Brayton cycle-based cogeneration plant. International Journal of Exergy 2009, 6, 1 .
AMA StyleXiaoli Hao, Guoqiang Zhang. Exergy optimisation of a Brayton cycle-based cogeneration plant. International Journal of Exergy. 2009; 6 (1):1.
Chicago/Turabian StyleXiaoli Hao; Guoqiang Zhang. 2009. "Exergy optimisation of a Brayton cycle-based cogeneration plant." International Journal of Exergy 6, no. 1: 1.
Application of landfill gas (LFG) means a synergy between environmental protection and energy production. This paper presents a review of the status of LFG application. To more efficiently utilize the LFG in Hong Kong, a trigeneration scheme is proposed as a new way of LFG utilization. The feasibility of LFG trigeneration in Hong Kong is evaluated from the views of primary energy-saving and greenhouse gas (GHG) emission reduction as well as economic benefit. The proposed scenario is compared with the conventional scenarios of LFG treatment and utilization. It is shown that LFG for trigeneration has a higher energy saving and GHG emission reduction potentials. The new scheme is also more economical than the conventional way of LFG utilization. Some policy recommendations are also given to promote the biomass energy utilization from waste landfills in Hong Kong.
Xiaoli Hao; Hongxing Yang; Guoqiang Zhang. Trigeneration: A new way for landfill gas utilization and its feasibility in Hong Kong. Energy Policy 2008, 36, 3662 -3673.
AMA StyleXiaoli Hao, Hongxing Yang, Guoqiang Zhang. Trigeneration: A new way for landfill gas utilization and its feasibility in Hong Kong. Energy Policy. 2008; 36 (10):3662-3673.
Chicago/Turabian StyleXiaoli Hao; Hongxing Yang; Guoqiang Zhang. 2008. "Trigeneration: A new way for landfill gas utilization and its feasibility in Hong Kong." Energy Policy 36, no. 10: 3662-3673.
Endoreversible Joule–Brayton cogeneration cycle has been optimized based on a new criterion, total useful energy-rate (including power output and useful heat output), and the efficiency at maximum total useful energy rate has also been determined. The effects of various cycle parameters on the maximum dimensionless total useful-energy rate and the efficiency at maximum total useful-energy rate have been assessed. Variations of dimensionless total useful-energy rate with respect to efficiency have also been analyzed. The reversible Joule–Brayton power cycle is a special case of the analyzed cycle.
Xiaoli Hao; Guoqiang Zhang. Maximum useful energy-rate analysis of an endoreversible Joule–Brayton cogeneration cycle. Applied Energy 2007, 84, 1092 -1101.
AMA StyleXiaoli Hao, Guoqiang Zhang. Maximum useful energy-rate analysis of an endoreversible Joule–Brayton cogeneration cycle. Applied Energy. 2007; 84 (11):1092-1101.
Chicago/Turabian StyleXiaoli Hao; Guoqiang Zhang. 2007. "Maximum useful energy-rate analysis of an endoreversible Joule–Brayton cogeneration cycle." Applied Energy 84, no. 11: 1092-1101.
During last century, worldwide environment degradation gets more and more serious, and achieving environmental sustainable development is desirable. As many environmental issues are directly or indirectly energy related, energy sustainable development is one of the most important prerequisites for environmental sustainable development. Renewable energy technologies and energy conservation are two solutions for energy sustainable development. At present, energy-saving technology is a feasible and an effective way to achieve energy and environmental sustainable development, although renewable energy may be final solution to environmental issues. Building cooling, heating, and power (BCHP) technology, which usually use natural gas as primary energy, has high efficiency of energy utilization due to the utilization of distributed power generation and heat recovery, and thus is a promising energy conservation technology. BCHP can reduce pollutants emission and thus protects the environment besides improving IAQ and increasing reliability of building energy supply. As the largest developing country, China is just in the process of adjusting energy structure and improving energy efficiency. Because of its significant role in energy and environmental sustainable development, developing BCHP in China will help the country in optimizing energy proportion, increasing energy efficiency, and protecting environment. Therefore, BCHP technology will have broad prospects in China and it will promote the country's energy and environmental sustainable development.
Xiaoli Hao; Guoqiang Zhang; Youming Chen. Role of BCHP in energy and environmental sustainable development and its prospects in China. Renewable and Sustainable Energy Reviews 2007, 11, 1827 -1842.
AMA StyleXiaoli Hao, Guoqiang Zhang, Youming Chen. Role of BCHP in energy and environmental sustainable development and its prospects in China. Renewable and Sustainable Energy Reviews. 2007; 11 (8):1827-1842.
Chicago/Turabian StyleXiaoli Hao; Guoqiang Zhang; Youming Chen. 2007. "Role of BCHP in energy and environmental sustainable development and its prospects in China." Renewable and Sustainable Energy Reviews 11, no. 8: 1827-1842.