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2019 3rd International Conference on Energy Conservation and Efficiency (ICECE)最新文献

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ICECE 2019 Preface
Pub Date : 2019-10-01 DOI: 10.1109/ece.2019.8921248
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引用次数: 0
ICECE 2019 Committees
Pub Date : 2019-10-01 DOI: 10.1109/ece.2019.8921037
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引用次数: 0
Low Temperature Thermal Energy Storage for Passive Cooling using Lauryl Alcohol 利用月桂醇进行被动冷却的低温热能储存
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8920848
Syed Shahzor Raza Bukhari, Majid Ali, A. Waqas
Renewable energy technologies gained substantial importance in recent years which reduced the use of conventional hydrocarbon fuels significantly, since they are sustainable, green and environment friendly. Large amount of energy is utilized by buildings especially for cooling purpose. It is estimated that 40 percent of the world’s total energy is used by the buildings, resulting in 33 percent of the greenhouse gas (GHGs) emissions every year. To overcome the excessive energy consumed by the cooling equipment, free cooling of the buildings using latent heat thermal energy storage (LTES) technologies via phase change materials (PCMs) is one of the feasible options to fulfill the energy demand of the building in an economical and efficient way. A “free cooling” technique that uses PCMs as cold accumulators during night time ventilation of buildings. In this concept cold air at night time is consumed to freeze PCM to a lower temperature and this cold energy stored is used during day time. “Lauryl alcohol” encapsulated into aluminium tube placed in a wooden box is used as PCM in experiments for free cooling technique. Air is passed above the tube in a properly designed channel to store and release the energy during charging and discharging. About 160g of lauryl alcohol is used to store 37 kJ and recovered 35 kJ of energy during phase change with heat transfer during charging and discharging is 9.6W and 9.37W respectively. The results indicate good performance of lauryl alcohol for passive/free cooling applications.
近年来,可再生能源技术变得十分重要,大大减少了传统碳氢化合物燃料的使用,因为它们是可持续的、绿色的和环境友好的。建筑消耗了大量的能源,尤其是用于冷却。据估计,建筑消耗了世界总能源的40%,每年产生了33%的温室气体(GHGs)排放。为了克服冷却设备所消耗的过多能量,利用相变材料(PCMs)对建筑进行潜热蓄热(LTES)技术的自由冷却是经济有效地满足建筑能源需求的可行选择之一。一种“自然冷却”技术,在建筑物夜间通风时使用pcm作为蓄冷器。在这个概念中,夜间消耗冷空气将PCM冻结到较低的温度,并在白天使用储存的冷能量。将“月桂醇”装入装入木箱的铝管中,作为自由冷却技术实验中的PCM。在充电和放电过程中,空气在适当设计的通道中通过管子上方,以存储和释放能量。在相变过程中,使用约160g的月桂醇存储37 kJ的能量,回收35 kJ的能量,充电和放电时的换热分别为9.6W和9.37W。结果表明,十二烷基醇具有良好的被动/自由冷却性能。
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引用次数: 3
optimization of Quaid-e-Azam Solar power park introducing axial tracking for the increase in Annual Energy Harvest Quaid-e-Azam太阳能园区的优化,引入轴向跟踪,以增加年能量收获
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8921208
M. Latif, Tallal Ahmed, W. Khalid, Muhammad Ammar Yaqoob, Wajahat Sultan
With the exponential increase in the Energy demand and high reliance on thermal generation, Pakistan is having severe energy security issues. Harvesting of renewable energy for the achievement of green sustainable energy is the way forward. Pakistan is blessed with a strategic location having highly optimum solar irradiation throughout the year. Solar PV modules are installed to harvest the energy. With the changing sun trajectory along the year, to improve the harvesting, PV systems are equipped with solar tracker that improves the energy yield. Quaid-e-Azam Solar Power Park in Bahawalpur is a landmark project by Government of Pakistan to set the orientation towards renewable energy. The solar arrays in the power park are set at a fixed angle of 32°. This study takes into consideration the results obtained in the yield by the alteration of tilt angles using the single-axis and dual-axis tracking systems. The simulations are carried out on the PV SYST and RETScreen software to indicate the optimization potential and its translation to reduction in GHG emissions. The results obtained indicates an improvement of 16.71% and 22.40% respectively in the annual yield of the Quaid-e-Azam solar power using single and dual axis tracker respectively. In addition to this, the optimization tends to the further reduce the GHG emissions by 17.8% and 24.65% employing single and dual axis tracking.
随着能源需求的指数级增长和对火力发电的高度依赖,巴基斯坦面临着严重的能源安全问题。收获可再生能源是实现绿色可持续能源的前进方向。巴基斯坦拥有得天独厚的战略位置,全年都能获得最佳的太阳照射。安装太阳能光伏组件来收集能量。随着太阳轨迹的变化,为了提高太阳能的收成,光伏系统配备了太阳能跟踪器,以提高能源产量。位于巴哈瓦尔布尔的Quaid-e-Azam太阳能公园是巴基斯坦政府确定可再生能源方向的里程碑式项目。发电园内的太阳能电池阵列以32°的固定角度设置。本研究考虑了单轴和双轴跟踪系统通过改变倾斜角度在产量中得到的结果。在PV系统和RETScreen软件上进行了模拟,以表明优化潜力及其对减少温室气体排放的转化。结果表明,采用单轴跟踪器和双轴跟踪器后,Quaid-e-Azam太阳能发电的年发电量分别提高了16.71%和22.40%。此外,采用单轴和双轴跟踪,优化后的温室气体排放量分别减少了17.8%和24.65%。
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引用次数: 2
The Impact of Domestic Energy Efficiency: Retrofit Study of Lights & Fans Using Deemed Saving Method 家庭能源效率的影响:采用公认节能方法的灯具和风扇改造研究
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8921020
Abdur Rahman, A. Hafeez, A. Faizan, Irsa Kanwal
This paper deals with the energy saving potential possible with the replacement of existing lights and fans with energy efficient LEDs and Pakistan Energy Labelled (PEL) fans in Punjab. As Punjab is considered as, the highest energy-consuming province of Pakistan, a case study is presented in which the retrofitting of current conventional lighting systems and fans with LEDs and Pakistan Energy Labelled (PEL) fans in the province is proposed. LEDs and Pakistan Energy Labelled (PEL) fans use less power comparatively and it has been assured that the output of light as well as of fans should be maintained same or better than the existing systems i.e. lumens/watt and air delivery respectively. LED lighting systems and (PEL) fans have huge energy saving potential, LEDs with payback period 9 months and (PEL) fans with payback period of 20 months.
本文讨论了在旁遮普用节能led和巴基斯坦能源标签(PEL)风扇取代现有的灯和风扇的节能潜力。由于旁遮普被认为是巴基斯坦能源消耗最高的省份,本文提出了一个案例研究,其中提出了在该省使用led和巴基斯坦能源标签(PEL)风扇改造当前传统照明系统和风扇的建议。相比之下,led和巴基斯坦能源标签(PEL)风扇使用更少的功率,并且确保光和风扇的输出应保持与现有系统相同或更好,即分别流明/瓦和空气输送。LED照明系统和(PEL)风扇具有巨大的节能潜力,LED回收期为9个月,(PEL)风扇回收期为20个月。
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引用次数: 2
Performance evaluation of silica-gel based desiccant dehumidification unit for air-conditioning applications 空调用硅胶除湿装置性能评价
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8921281
Akash Siddique, M. Sultan
Low cost and environment friendly air conditioning system are required for many applications like human thermal comfort and industrial process. Conventional vapor-based air condition (VCAC) are not feasible solution due to high energy consumption and harmful effects on environment e.g. ozone layer depletion (OLD), global warming potential (GWP). Water based cooing system (direct and indirect evaporative cooling) can achieve cooling load in dry conditions but in humid conditions not found efficient. In this regard, Desiccant air conditioning (DAC) is a promising technology in order to achieve the required load for air conditioning. In this study, a lab scale silica gel based desiccant unit is developed and its heat and mass transfer characteristics are evaluated in the form of Nusselt number (Nu) and the Sherwood number (Sh). The working principle, important features and experimental procedure of DAC is described. Data is collected at the inlet and outlet of desiccant unit in the form of Temperature (T) and Relative Humidity (RH). Obtained data is used for calculation of the Nu and Sh. Adsorption temperature was considered 30°C and 35°C and time interval is considered at 20:20 $displaystyle min$ and 30:30 $displaystyle min$ and mass flow rate of air is 0.05 kg/s. The results show that heat and mass are being transferred primarily due to convection.
低成本、环保的空调系统被广泛应用于人体热舒适和工业过程中。传统的汽基空调由于其高能耗和对环境的有害影响(如臭氧层损耗(OLD)、全球变暖潜值(GWP))而不是可行的解决方案。水基冷却系统(直接蒸发冷却和间接蒸发冷却)可以在干燥条件下达到冷却负荷,但在潮湿条件下效率不高。在这方面,干燥剂空调(DAC)是一种很有前途的技术,以达到空调所需的负荷。在本研究中,开发了一种实验室规模的硅胶基干燥剂单元,并以努塞尔数(Nu)和舍伍德数(Sh)的形式评估了其传热传质特性。介绍了DAC的工作原理、主要特点和实验步骤。在干燥剂装置的进出口处采集数据,以温度(T)和相对湿度(RH)的形式采集。吸附温度分别为30°C和35°C,时间间隔为20:20 $displaystyle min$和30:30 $displaystyle min$,空气质量流量为0.05 kg/s。结果表明,热量和质量的传递主要是通过对流进行的。
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引用次数: 0
Load Power Smoothing and DC Bus Voltage Control of PV-SMES Standalone Microgrid based Variable Speed DG using FLC-MPC Approach 基于FLC-MPC方法的PV-SMES独立微网变速DG负载功率平滑与直流母线电压控制
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8920903
H. Habib, Shaorong Wang, Bashar Sakeen Farhan, Hasan Wahhab Salih, A. Waqar, Kotb M. Kotb
Microgrids (MGs) are small scale power grids which comprised of local clean and green energy generation as well as smart energy management units. These systems represent promising solutions for the development of future smart cities. This paper proposes a stand-alone hybrid microgrid system comprising of a variable speed diesel generator (VSDG) and photovoltaic (PV) system in order to reduce the fuel consumption and carbon emissions. Maximum power point tracking (MPPT) is applied to the PV system in coordination with a superconducting magnetic energy storage (SMES) unit since the output power affects the speed response of the generator. A fuzzy logic controller (FLC) is developed to track the speed response. A Load Power Tracking (LPT) algorithm is proposed to extract the exact amount of required power from the generation side based on the load demand. Furthermore, this study compares the system performance and load power quality by applying space vector pulse width modulation-based PI controller (SVPWM-PI) against model predictive control (MPC) to the interlinking inverter. Simulation results show the superior performance of MPC with fewer voltage harmonics and better load power quality.
微电网是由当地清洁和绿色能源发电以及智能能源管理单元组成的小型电网。这些系统代表了未来智慧城市发展的有希望的解决方案。本文提出了一种由变速柴油发电机(VSDG)和光伏(PV)系统组成的独立混合微电网系统,以降低燃料消耗和碳排放。由于输出功率影响发电机的转速响应,将最大功率点跟踪(MPPT)应用于光伏发电系统中,并与超导磁能存储装置(SMES)配合使用。设计了一种模糊逻辑控制器(FLC)来跟踪速度响应。提出了一种基于负荷需求从发电侧准确提取所需功率的负荷跟踪算法。此外,本研究通过将基于空间矢量脉宽调制的PI控制器(SVPWM-PI)与模型预测控制(MPC)应用于互连逆变器,比较了系统性能和负载电能质量。仿真结果表明,MPC具有较低的电压谐波和较好的负载电能质量。
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引用次数: 2
Enhancing LVRT Capability of Small-Scale Hydro Power System using DFIG 利用DFIG提高小型水电系统LVRT能力
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8921038
M. Ilyas, A. Basit, M. Hamid, Ihsan Ullah, A. Ahmad
Doubly-fed induction generator (DFIG) now a days is widely used in wind energy system while the research is also going on to use it for small scale hydro power systems on sites, where there is low variations in water flow in different seasons to improve overall efficiency of the system. Since the stator circuit of DFIG is connected directly to the grid making it sensitive to any grid disturbances. According to the grid codes, the generation system must remain connected to the grid in case of dips and should support the grid during voltage dips by supplying reactive power to the grid to recover the voltage soon after the dip and helps stabilizing the system. A lot of research work is going on since last several years to revamp low-voltage ride through capability of the generation system. In this paper DFIG behaviour under symmetrical voltage dips are scrutinized.Furthermore, a new technique known as “Controlling Generator Magnetizing Current(CGMC)” is developed to augment the response of the system in case of symmetrical dips in voltage and decay the stator flux faster to avoid losing control of the system. Finally simulation results are verified, presented and discussed in terms of its practical implementations.
双馈感应发电机(DFIG)目前已广泛应用于风力发电系统中,同时也在研究将其应用于不同季节水流量变化较小的现场小型水力发电系统,以提高系统的整体效率。由于DFIG的定子电路直接与电网相连,因此对电网的任何扰动都很敏感。根据电网规范,发电系统在电压下降的情况下必须保持与电网的连接,并在电压下降期间通过向电网提供无功功率来支持电网,以便在电压下降后尽快恢复电压并帮助稳定系统。近年来,为了提高发电系统的低压穿越能力,进行了大量的研究工作。本文研究了DFIG在对称电压跌落下的性能。此外,还提出了一种新的控制发电机磁化电流(CGMC)技术,以增强系统在电压对称下降情况下的响应,并更快地衰减定子磁通,以避免系统失去控制。最后对仿真结果进行了验证,并就其实际实现进行了介绍和讨论。
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引用次数: 1
Experimental Investigation Of Using Latent Thermal Energy Storage System Comprising Of Magnesium Chloride Hexahydrate (MgCl2.6H2O) With Domestic Gas Heater 六水氯化镁(MgCl2.6H2O)潜热储能系统与家用燃气加热器的实验研究
Pub Date : 2019-10-01 DOI: 10.1109/ECE.2019.8921173
Fawad Ahmed, A. Waqas
Thermal energy storage is an active field of research that can be adopted for energy efficiency and conservation in thermal applications on conventional systems. Moreover, they are equally effective to be used with renewable resources to mitigate their intermittency in terms of availability. This paper covers the experimental investigation of the latent thermal energy storage system, in which Magnesium Chloride Hexahydrate (MgCl2.6H2O) was used as thermal energy storage material. Literature lists MgCl2.6H2O as a strong candidate for thermal energy storage in the medium range with melting temperature of 117.5° C and latent heat of 168.6 kJ/kg. Aluminum encapsulation was used with PCM for testing with gas heater. The flame temperature of domestic gas heater ranges from 600 to 800° C, at this temperature the PCM was fully charged in less than 900s and stored about 30 kJ of thermal energy till the final temperature of the material reached to 320° C. In the discharging phase, subcooling was observed and the material released thermal energy to a threshold temperature of 60° C in 930s. This study considered the direct contact TES system.
热能储存是一个活跃的研究领域,可以在传统系统的热应用中采用能源效率和节约。此外,就可用性而言,它们与可再生资源一起使用同样有效,以减轻其间歇性。本文对以六水氯化镁(MgCl2.6H2O)为储热材料的潜热储能系统进行了实验研究。文献表明,MgCl2.6H2O在中等范围内具有较强的储热性能,其熔融温度为117.5℃,潜热为168.6 kJ/kg。采用铝封装和PCM对燃气加热器进行测试。家用燃气加热器的火焰温度在600 ~ 800℃之间,在此温度下,PCM在不到900s的时间内充满电,并存储了约30kj的热能,直到材料的最终温度达到320℃。在放电阶段,观察到过冷现象,材料在930s内释放热能至60℃的阈值温度。本研究考虑直接接触TES系统。
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引用次数: 1
ICECE 2019 Index
Pub Date : 2019-10-01 DOI: 10.1109/ece.2019.8920912
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引用次数: 0
期刊
2019 3rd International Conference on Energy Conservation and Efficiency (ICECE)
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