Dezhou, China

Himin Solar Energy Group
Dezhou, China
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Lu Z.S.,Shanghai JiaoTong University | Wang R.Z.,Shanghai JiaoTong University | Xia Z.Z.,Shanghai JiaoTong University | Lu X.R.,Himin Solar Energy Group | And 3 more authors.
Renewable Energy | Year: 2013

One two-phase thermo-syphon silica gel-water solar adsorption chiller and LiBr-H 2O absorption chiller with new medium CPC (Compound Parabolic Concentrator) solar collectors were investigated. The reliability of adsorption chiller can be improved, because there is only one vacuum valve in this innovative design. Medium temperature evacuated-tube CPC solar collectors were firstly utilized in the LiBr-H 2O air conditioning system. The former system was applied in north of China at Latitude 37.45° (Dezhou city, China), the latter system was applied at Latitude 36.65° (Jinan city, China). Experimental results showed that the adsorption chiller can be powered by 55 °C of hot water. The adsorption chiller can provide 15 °C of chilled water from 9:30 to 17:00, the average solar COP (COPs) of the system is 0.16. In the absorption cooling system, the efficiency of the medium temperature evacuated-tube CPC solar collector can reach 0.5 when the hot water temperature is 125 °C. The absorption chiller can provide 15 °C of chilled water from 11:00 to 15:30, and the average solar COPs of absorption system is 0.19. © 2012.

Liu J.,North China Institute of Aerospace Engineering | Lei D.,CAS Institute of Electrical Engineering | Li Q.,Himin Solar Energy Group
Renewable Energy | Year: 2016

The vacuum characteristics and lifetime are the key problems of parabolic trough receiver. Heat loss of the receiver will greatly increase when the vacuum has been lost. Especially, if hydrogen is inside the annulus space of the receiver, heat loss at a level is approximately a factor of four higher than the loss for a receiver with good vacuum. Suitable vacuum levels and residual gases should be maintained in the receiver to ensure performances during its projected lifetime. In this paper, the variations of composition and partial pressure of residual gases with temperature in the receiver were measured by a high sensitivity quadrupole mass spectrometer gas analyzer. The effects of residual gas and getter on the vacuum lifetime of receiver were analyzed. The results showed that hydrogen was the main residual gas in the annular space of receiver without getter, and the nitrogen was the main gas released in the receiver with getter. It can be confirmed that the residual gas analysis was a very effective way to predict and evaluate the vacuum lifetime of the receiver. © 2015 Elsevier Ltd.

Xu L.,CAS Institute of Electrical Engineering | Xu L.,University of Chinese Academy of Sciences | Wang Z.,CAS Institute of Electrical Engineering | Yuan G.,CAS Institute of Electrical Engineering | And 2 more authors.
Solar Energy | Year: 2012

A new study on testing thermal performance of all-glass evacuated solar collectors with the air as heat transfer fluid under dynamic conditions outdoors has been developed. The model of this dynamic method was established with the energy balance analysis on solar collectors of this type. Compared with the first order model under steady-state conditions, this model can characterize thermal efficiency of solar collectors under more extensive conditions, reducing considerable operating time spent in waiting for the right test conditions. Through the derivation of the proposed model, it proved a strong relationship existed between this model and the first order model mentioned above. The dynamic model projection for the outlet temperatures was in good agreement with the measured result. © 2012 Elsevier Ltd.

Lei D.,CAS Institute of Electrical Engineering | Li Q.,Himin Solar Energy Group | Wang Z.,CAS Institute of Electrical Engineering | Li J.,CAS Institute of Electrical Engineering | Li J.,Himin Solar Energy Group
Energy Conversion and Management | Year: 2013

The receiver is a key component of the parabolic trough solar station. The receiver requires the most challenging technology and has a decisive influence on the thermal and economic performance of a power plant. The Institute of Electrical Engineering Chinese Academy Sciences (IEECAS) and Himin Solar Co., Ltd. (HSC) cooperated to develop solar receivers for the first 50 MW parabolic trough project in Inner Mongolia, China. This paper examines overall heat loss, end loss and thermal emittance of the coating of a newly designed receiver in order to evaluate its thermal characterization. A series of heat loss tests are conducted in a newly developed test stand following the steady state equilibrium method. The tests provide a correlation between heat loss and the absorber temperature. This paper presents a new testing method to accurately test the coating emittance. The method uses a receiver with a high vacuum system and a vacuum gauge to maintain continuous exhaust and high vacuum throughout the heat loss testing. A heat loss comparison between the receiver and other existing receivers provides a reference that enabled further optimization. Theoretical and experimental analysis examines the effects of end loss both with and without a heat insulator and a coil heater. The emittance curves of different coatings are acquired and the reasons for initial emittance decrease and then remarkable increase versus temperature are analyzed. © 2013 Elsevier Ltd. All rights reserved.

Yuan G.,CAS Institute of Electrical Engineering | Wang Z.,CAS Institute of Electrical Engineering | Li H.,Himin Solar Energy Group | Li X.,Himin Solar Energy Group
Desalination | Year: 2011

In this paper, an experimental investigation of a 1000L/day solar humidification-dehumidification system was presented. The system has been designed and constructed by the Chinese Academy of Sciences and HIMIN Solar Co., Ltd, based on a series of researches since the year 2007. This system was composed of a 100m2 solar air heater field, a 12m2 solar water collector, a humidifier-dehumidifier unit, a pre-treatment and post-treatment system and other subsystems. Performance of the solar air heater field and the humidifier was investigated by experimental tests and analyses. Water production tests were carried out on several typical days, and the results showed that water production of the system could reach 1200L/day, when the average intensity of solar radiation got to 550W/m2. © 2011 Elsevier B.V.

Li J.,CAS Institute of Electrical Engineering | Wang Z.,CAS Institute of Electrical Engineering | Li J.,Himin Solar Energy Group | Lei D.,CAS Institute of Electrical Engineering
Solar Energy Materials and Solar Cells | Year: 2012

Experience has shown that the vacuum reliability and lifetime of parabolic trough receiver are one of the most significant issues for existing and future parabolic trough plants, affecting the plant efficiency and revenue. The gas sources within parabolic trough receiver and absorption characteristics of the getter were evaluated to analyze the factors affecting vacuum reliability. The outgassing rate and the gas species within parabolic trough receiver were tested to show that besides hydrogen permeation caused by thermal degradation of the organic heat transfer fluid, outgassing may also lead to hydrogen accumulation. The analysis further shows that both high and low temperatures affect the getter ability to absorb H 2. O 2, CO, N 2 and CO 2, introduced into the receiver vacuum annulus by outgassing or leakage, significantly reduce the getter surface activity, which reduces the H 2 absorption capacity. © 2012 Elsevier B.V.

Lei D.,CAS Institute of Electrical Engineering | Wang Z.,CAS Institute of Electrical Engineering | Li J.,CAS Institute of Electrical Engineering | Li J.,Himin Solar Energy Group | Wang Z.,Himin Solar Energy Group
Renewable Energy | Year: 2012

The breakage of the glass to metal sealing is the primary ongoing issue for the solar receiver tubes in parabolic trough solar power systems. Sealing failure leads to loss of the vacuum inside the tube which substantially reduces the collector efficiency. It is a technical difficulty to obtain good glass to metal seals with high mechanical strength and long-term temperature resistance during current receiver manufacturing. The paper describes the development of the glass to metal seals in the parabolic trough receivers and presents a new method that uses the high-frequency induction heating to band a new borosilicate glass to the Kovar alloy ends. Kovar pre-oxidization experiments were used to measure the relation curves of Kovar oxidation weight gain during heating. The preoxidation of Kovar and the sealing process are guided by a series tests to measure the gas tightness, sealing strength, seal interface microstructure and thermal shock. The results show that excellent glass-to-Kovar sealing can be obtained with a Kovar oxidation weight gain of about 0.3-0.8 mg/cm 2. Finally, a new solar receiver was developed by the new sealing method. © 2012 Elsevier Ltd.

Xu F.,North China University of Technology | Liang W.,Himin Solar Energy Group
11th International Conference on Control, Automation, Robotics and Vision, ICARCV 2010 | Year: 2010

The aiming accuracy of the optical axis of a heliostat directly affects the working efficiency of a concentrating solar tower plant. Due to the size of heliostat, it is difficult to measure the orientation of the optical axis directly during the tracking process. With a computer-vision based measuring system, the center of reflecting beam of a heliostat can be detected, but the result is disturbed by internal and external interferences. This paper presents a method to estimate the orientation of optical axis of a tracking heliostat using unscented kalman filter based on the measured beam center data. Simulation results and estimations based on actual measurements are presented in the paper. ©2010 IEEE.

Li J.,Chinese Academy of Sciences | Wang Z.,Chinese Academy of Sciences | Lei D.,Chinese Academy of Sciences | Li J.,Himin Solar Energy Group
Solar Energy | Year: 2012

Hydrogen gas formed by the thermal decomposition of organic heat transfer fluids can permeate through parabolic trough receiver tubes into the vacuum annulus, leading to significant heat losses in the receiver which reduces the parabolic trough power plant efficiency. This problem is quite important as these systems are being developed to drive down the cost of electricity. Thus, hydrogen permeation in parabolic trough power plants must be understood to develop strategies to reduce or prevent hydrogen gas accumulation in the receiver annulus. Hydrogen permeation model for parabolic trough receivers was developed based on measurements of hydrogen permeability of solar-selective coatings. The model was then used to study the effects of the hydrogen generation rate, the hydrogen pressure in the receiver tubes and the hydrogen barrier coating on the hydrogen permeation into the annulus. The hydrogen generation rate plays a significant role in the hydrogen permeation process, with the hydrogen pressure, permeability and adsorb area all related to balancing the hydrogen permeation rate with the hydrogen generation rate. © 2012 Elsevier Ltd.

Himin Solar Energy Group | Date: 2012-06-13

The embodiment of the invention provides a supporting and a shape-regulating device for a reflector of a heliostat, which relates to the solar field. Said device is installed on the back of said reflector of said heliostat and fixed with a support of said heliostat, said supporting and shape-regulating device comprises a shape-regulating part for adjusting the curvature of said reflector and an adjusting part for adjusting the pitch and angle of said reflector; said shape-regulating part comprises at least four shape-regulating components, wherein at least one shape-regulating component is installed on a central sleeve of connection claws in the centre of said reflector, the others are installed on the edge of said reflector and connected respectively with said central sleeve of connection claws through respective supporting arms of connection claws, said shape-regulating components comprise suckers and adjustable fasteners; said adjusting part is set up correspondingly on the side part of said centre sleeve of connection claw, said adjusting part comprises a transition part and an adjusting fastener, said transition part is fixed with said support, said adjusting fastener is set up between said transition part and said centre sleeve of connection claw. Thus, the invention has a simple structure and good adjusting effect, it is convenient to adjust, and easy to process and manufacture.

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