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Yan S.,Inner Mongolia University of Technology | Yan S.,China Solar Power | Wang F.,Inner Mongolia University of Technology | Shi Z.,Inner Mongolia University of Technology | And 2 more authors.
Applied Thermal Engineering | Year: 2017

Nanofluid is one of the innovative and promising heat-transfer fluids. In this work, SiO2/water nanofluid was prepared with two-step method by microfluidizer processor. The thermal conductivity and the transmissivity of SiO2/water nanofluid with mass fraction of 1%, 3% and 5% were tested in the experiment. The temperature variations and velocity distributions of working fluid including water and nanofluid were calculated via numerical simulation in order to discuss the heat transfer property of SiO2/water nanofluid flow inside the collector tube. According to the numerical model, water and SiO2/water nanofluid (5 wt.%) were chosen as the working fluids of solar-collector vacuum tubes in insolation experiment, respectively. The results showed that the heat-transfer property of SiO2/water nanofluid were higher than that of water and increased with the mass fraction. Meanwhile, the influences of the placing time of nanofluid on heat transfer property were also referred. The results indicated that longer nanofluid placing time, easier nanofluid agglomeration and this phenomenon led to its heat transfer character became weak. © 2017 Elsevier Ltd

Yu Q.,CAS Institute of Electrical Engineering | Yu Q.,China Solar Power | Wang Z.,CAS Institute of Electrical Engineering | Wang Z.,China Solar Power | Zhu L.,China Electric Power Research Institute
AIP Conference Proceedings | Year: 2017

The central receiver, which plays a dominant role in the radiation-heat conversion, is one of the most important components in the solar tower power plants. Its performance can directly affect the efficiency of the entire solar power generation system. In general, the performance of the central receiver is mainly determined by two aspects: the first is the receiver structure and arrangement of heating pipes, the other is the integral control and operation strategy. The former is the internal essence of the receiver and the latter is extrinsic. In this paper, the latter is temporarily not in the scope of the discussion. According to the previous cavity structure and arrangement of the heating pipes, it is found that there are varying degrees of deformation to the heating pipes, especially for the superheated pipes. In order to make some improvement for the cavity receiver, firstly, the most likely causes were analyzed according to the previous structure. Secondly, a possible cavity structure was proposed according to the calculation results. The results show that the performance of the receiver is better than the previous one. © 2017 Author(s).

La D.,Shanghai JiaoTong University | La D.,China Solar Power | Dai Y.,Shanghai JiaoTong University | Dai Y.,China Solar Power | And 6 more authors.
Solar Energy | Year: 2011

In this paper, a solar hybrid desiccant air conditioning system, which combines the technologies of two-stage desiccant cooling (TSDC) and air-source vapor compression air-conditioning (VAC) together, has been configured, experimentally investigated and theoretically analyzed. The system mainly includes a TSDC unit with design cooling capacity for 10kW, an air-source VAC unit with 20kW in nominal cooling capacity, a flat plate solar collector array for 90m2, a hot water storage tank and a cooling tower. Performance model of the system has been created in TRNSYS simulation studio. The objective of this paper is to report the test result of the solar hybrid air conditioning system and evaluate the energy saving potential, thereby providing useful data for practical application. Experimental results show that, under typical weather condition, the solar driven desiccant cooling unit can achieve an average cooling capacity of 10.9kW, which contributes 35.7% of the cooling capacity provided by the hybrid system. Corresponding average thermal COP is over 1.0, electric COP is up to 11.48. Under Beijing (temperate), Shanghai (humid) and Hong Kong (extreme humid) weather conditions, the solar TSDC unit can remove about 57%, 69% and 55% of the seasonal moisture load, thereby reducing electric power consumption by about 31%, 34% and 22%, respectively. These suggest that the solar hybrid system is feasible for a wide range of operating conditions. © 2011 Elsevier Ltd.

Li X.,Shanghai JiaoTong University | Dai Y.J.,Shanghai JiaoTong University | Dai Y.J.,China Solar Power | Li Y.,Shanghai JiaoTong University | And 2 more authors.
Solar Energy | Year: 2013

Two truncated compound parabolic concentrating (CPC) solar collectors, which combine the external CPC and the U-shape evacuated tube together, have been developed and tested in this paper. The CPC solar collectors are edge-ray and gap-lossless collectors with different concentration ratios of 3.06 (3×) and 6.03 (6×) and half-acceptance angles of 10° and 3°, respectively. A theoretical model of the CPC collector has been created and the detailed numerical simulation for optical, thermal and heat transfer fluid (HTF) behaviors of the CPC collector is carried out. In addition, the theoretical model has been validated using experimental results obtained by the testing system. The main objective of this paper is to report test results of the 3× and the 6× CPC solar collectors with the U-shape evacuated tube, and to evaluate thermal performance which includes the overall heat loss as well as thermal efficiency, thereby providing useful data for practical solar process heat applications at the intermediate temperature within 80 °C and 250 °C, such as industrial process heat and solar cooling. Experimental results indicate that the tilt angle of the 3× CPC collector is unnecessary to be adjusted in 1. day, however, it should be adjusted during the year. Correspondingly, the 6× CPC collector does need to be adjusted five times in 1. day due to its small half-acceptance angle. Under given test conditions, the daily thermal efficiencies of the 3× and the 6× CPC collectors can reach 40% and 46% at the collecting temperature of 200 °C, respectively. These verify that these kinds of CPC solar collectors are feasible for a wide range of intermediate temperature applications. © 2013 Elsevier Ltd.

Li X.,Shanghai JiaoTong University | Dai Y.J.,Shanghai JiaoTong University | Dai Y.J.,China Solar Power | Li Y.,Shanghai JiaoTong University | And 3 more authors.
Solar Energy | Year: 2013

Development of the cost-effective single-pass evacuated tubular collector (SPETC) for the solar processes heat is a particular topic of active research. A novel SPETC with a symmetrical compound parabolic concentrator (CPC) has been introduced, experimentally investigated and theoretically analyzed in this paper. The novel SPETC is mainly composed of a double-glass evacuated tube deposited the selective absorbing coating, as well as six expansion joints. Correspondingly, the symmetrical CPC has been designed and fabricated using the high-reflectivity 3M mirror films pasted over the stainless steel substrate. In addition, detailed numerical models for thermal behaviors of the SPETC with the CPC reflector, based on the three-dimensional CFD method, have been developed and validated with experimental data. The objective of this paper is to report the test results of the novel SPETC with the CPC, evaluate optical and thermal performances including the heat flux distribution on the absorber surface, heat losses, as well as thermal efficiencies, thereby providing useful data for practical solar process heat application. Experimental results indicate that a daily thermal efficiency of 48% can be reached at a difference of 59.6K between inlet and ambient temperatures under a volume flow rate of 0.0077m3s-1. Corresponding numerical prediction shows that the operational volume flow rate between 0.007 and 0.01m3s-1 is suggested to the SPETC using the HTF (air) under the geometry and operational conditions in this paper. These results suggested that the novel SPETC is feasible for industrial process heat and solar cooling system combined with the adsorption chiller or the desiccant wheel. © 2013 Elsevier Ltd.

Ji F.,Harbin Institute of Technology | Cai X.,Harbin Institute of Technology | Wang C.,China Solar Power
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2016

Influenced by the intermittent and volatility of wind speed, wind Power has significant uncertainty which bring new challenge of power system dispatch integrated wind power. Recent years, robust optimization as a novel method to deal with uncertainty has been used to power system dispatch integrated wind power. But most robust dispatch models mainly consider the feasible and conservation of solutions from the construction of uncertainty set and worsen of the objective function was not considered. While the system operators may concern the solutions feasible and worsen of objective function, i.e. pay reasonable cost for the feasible solutions. Therefore, a light robustness dispatch model for wind power integrated power system has been proposed in the paper. In the dispatch model forecasted wind power was used to build normal scenario and specified worsen of normal scenario objective function was used to construct the light robustness dispatch model. At last, a test system contains two wind farms and ten thermal generators was used to verify the light robustness dispatch model. © 2016 Chin. Soc. for Elec. Eng.

Hongchun Y.,State Grid Electric Power Research Institute of China | Ming X.,China Solar Power
Lecture Notes in Electrical Engineering | Year: 2011

According to the development status of large-scale PV power station, this paper expatiates the requirement of supervisory control and data acquisition (SCADA) system of large-scale PV power station, and presents the design method and application technique of the system based on fieldbus and industrial ethernet. The system is flexible and reliable, and will promote the efficiency of operation and maintenance of large-scale PV power station. © 2011 Springer-Verlag.


China Solar Power | Date: 2012-12-11

Solar batteries; Galvanic batteries; Materials for electricity mains, namely, electric wires and cables; Monocrystalline silicon chips; Polycrystalline silicon chips; Electronic wafers, namely, structured semi-conductor wafers, solar wafers, silicon wafers; Electric Coils; Electric transformers; Acidimeters for batteries; Lightning arresters.


China Solar Power | Date: 2012-12-04

Alabaster; Glass for building; Insulated glass; Insulating glass for windows for building purposes; Non-metal structures for mounting solar panels; Pavement incorporating silicon solar cell material for electrical energy generation; Roofing, not of metal, incorporating solar cells; Safety glass for building purposes; Stained glass windows; Window glass.

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