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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.


Mao J.D.,Beifang University of Nationalities | Zhang X.J.,China Solar Power | Li J.,Beifang University of Nationalities
Applied Mechanics and Materials | Year: 2013

Accurate short-term wind power forecasting has important significance to safety, stability and economy of power system dispatching and also it is a difficult problem in practical engineering application. In this paper, by use of the data of numerical weather forecast, such as wind speed, wind direction, temperature, relative humidity and pressure of atmosphere, a short-term wind power forecasting system based on BP neural network has been developed. For verifying the feasibility of the system, some experiments have been were carried out. The results show that the system is capable of predicting accurately the wind power of future 24 hours and the forecasting accuracy of 85.6% is obtained. The work of this paper has important engineering directive significance to the similar wind power forecasting system. © (2013) Trans Tech Publications, Switzerland.


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.


Hou Y.,Inner Mongolia University of Technology | Hou Y.,China Solar Power | Wang J.,Inner Mongolia University of Technology | Wang J.,China Solar Power
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2015

The flow characteristics of eight rectangular microchannels with different geometric parameters are measured when distilled water is used as a working fluid. The relationship between friction factor or Poisuille number and Reynolds number is obtained, further the influences of hydraulic diameter, the ratio of height to width, and the ratio of channel length to hydraulic diameter on flow characteristics are analysed. The results show that the friction factor and Poisuille number increase with the decreasing hydraulic diameter and length-to-hydraulic diameter ratio at the same height-to-width ratio. For the microchannels with nearly the same length-to-hydraulic diameter ratio but different height-to-width ratio, the friction factor and Poisuille number grow with the reducing height-to-width ratio. Specially, in the range of variation of parameters interested in our study, the influence of height-to-width ratio is more denominated than the other geometric parameters. Hence the friction factor of rectangular microchannels is a complicated function of hydraulic diameter, height-to-width ratio and length-to-hydraulic diameter ratio. ©, 2015, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.


Csp

Trademark
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.


Csp

Trademark
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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