检索结果-南通市图书馆

science china(Technological sciences) 2010年第3期53卷 878-880页

作者： chen zeshao 1,mo songping 1,2 &hu peng 1 1department of thermal science and energy engineering,university of science and technology of china,hefei 230027,china 2 Faculty of Material and energy,Guangdong university of technology,Guangzhou 510006,china 1. department of thermal science and energy engineering University of Science and Technology of China Hefei 230027 China2. Faculty of Material and Energy Guangdong University of Technology Guangzhou 510006 China

Two counterexamples in Liu's comment on'Recent Progress in Thermodynamics of Radiation—Exergy of radiation,effective temperature of photon and entropy constant of photon'are analyzed and the incorrect applications of the related concepts are *** similarities and differences between the concepts of the effective temperature of photon,the exergy of spectral radiation,the entropy constant of photon and the macroscopic concepts of temperature,exergy,and entropy are further *** duality of radiant energy,micro-state quantum characteristic and macro-state thermal characteristic is presented.

关键词： thermodynamics of radiation photon entropy

Recent progress in thermodynamics of radiation——exergy of radiation, effective temperature of photon and entropy constant of photon

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science china(Technological sciences) 2008年第8期51卷 1096-1109页

作者： chen zeshao mo songping hu peng department of thermal science&energy engineering University of Science and Technology of ChinaHefei 230027China

The recent progress on thermodynamic properties of spectral radiant energy in the field of thermodynamics of radiation is reviewed. The effective temperature of photon Tλ representing the energy quality of photon is introduced. The relation between Tλ and the wavelength λ is given as λTλ =c3=5.33016×10?3 m·K. The en- tropy constant of photon is given as sλ=3.72680×10?23 J/K. The exergy, entropy and enthalpy of the spectral blackbody radiation, the equilibrium cavity radiation, the radiation flux in open system are discussed by using Tλ and sλ, as well as the en- tropy change in the process of the state transformation of photon gas. By analyzing the exergy of spectral radiation, the exergy efficiency of spectral radiant energy available for photosynthesis is proved to be higher than that of light energy. The method for the irreversible loss of exergy calculation in radiant energy converters is also discussed.

关键词： thermodynamics of radiation photon gas exergy photon entropy non-equilibrium thermodynamics

Prediction of saturated liquid enthalpy of refrigerant mixtures

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science china(Technological sciences) 2007年第2期50卷 241-247页

作者： chen zeshao chen JianXin hu peng department of thermal science&energy engineering University of Science and Technology of ChinaHefei 230027China

New corresponding temperature and corresponding enthalpy of refrigerant mix- tures were defined. The relationship between saturated liquid corresponding en- thalpy and corresponding temperature of refrigerant mixtures accorded with that of pure components. The characteristic parameters of saturated liquid enthalpy dif- ference of refrigerant mixtures were calculated by three methods according to the different application conditions. The generalized equation of saturated liquid en- thalpy of refrigerant mixtures was presented. The calculated values were compared with the values in literature for five ternary and binary refrigerant mixtures, namely R404A, R407A, R407B, R32/R134a, and R410A. The overall average absolute devia- tion was less than 1.0%.

关键词： refrigerant mixtures saturated liquid enthalpy prediction corresponding state

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温差发电器件导热系数

太阳能学报 2004年第6期25卷 816-819页

作者：贾磊陈则韶刘晓光胡芃王泽深中国科学技术大学热科学和能源工程系合肥230027 中国电子科技集团公司第十八研究所天津300000

建立了半导体温差发电器件的基本模型,推导出器件等效导热系数的数学表达式,发现其与N型、P型半导体材料及两端陶瓷片的导热系数紧密相关,对半导体材料和陶瓷片的导热系数随温度的变化关系进行了实验研究并进行了数值拟合,绘制了器件等... 详细信息

建立了半导体温差发电器件的基本模型,推导出器件等效导热系数的数学表达式,发现其与N型、P型半导体材料及两端陶瓷片的导热系数紧密相关,对半导体材料和陶瓷片的导热系数随温度的变化关系进行了实验研究并进行了数值拟合,绘制了器件等效导热系数与温度的曲线,得到的计算值与实验结果基本吻合。

关键词：半导体温差发电导热系数

Optical analysis of a hybrid solar concentrating Photovoltaic /thermal (CPV/T) system with beam splitting technique

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science china(Technological sciences) 2013年第6期56卷 1387-1394页

作者： hu peng ZHANG Qian LIU Yang SHENG Chunchen chenG XiaoFang chen zeshao department of thermal science and energy engineering University of Science and Technology of China

A novel hybrid solar concentrating Photovoltaic/thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: one for the PV power generation and the other for thermal utility. The solar concentrator is a flat Fresnel-type concentrator with glass mirror reflectors. It can concentrate solar radiation onto solar cells with high uniformity, which is beneficial to improving the efficiency of solar cells. The thermal receiver is separated to the solar cells, and therefore, the thermal fluid can be heated to a relatively high temperature and does not affect the performance of solar cells. A dimensionless model was developed for the performance analysis of the concentrating system. The effects of the main parameters on the performance of the concentrator were analyzed. The beam splitter with coating materials Nb2O3 /SiO2 was designed by using the needle optimization technique, which can reflect about 71% of the undesired radiation for silicon cell(1.1m thermal receiver for thermal utility. The performance of this CPV/T system was also theoretically analyzed.

关键词： solar energy hybrid concentrating Photovoltaic/thermal (CPV/T) system flat Fresnel-type concentrator beam splitting

Thermodynamic analysis on medium-high temperature solar thermal systems with selective coatings

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science china(Technological sciences) 2013年第12期56卷 3137-3143页

作者： hu peng LIU Yang ZHANG Qian chen zeshao department of thermal science and energy engineering University of Science and Technology of China

Thermodynamics analysis was carried out for solar thermal receivers with different selective *** relation between the energy conversion efficiency of a medium-high temperature solar thermal system,the spectral properties of selective coating and the operating temperature of the receiver were ***,the relation between the optimum operating temperatures,the exergy efficiencies and the incident solar flux were analyzed for the traditional concentrating system and concentrating beam splitting system,*** to the analysis results for the thermal receiver with blackbody surface and selective coatings,the optimum cutoff wavelength was obtained for the ideal selective *** analysis method for the optimum operating temperature calculation was developed for thermal receivers with selective *** optimum operating temperature for an actual selective coating was analyzed on the basis of the proposed theory.

关键词： solar energy thermal receiver selective coating thermodynamic analysis concentrating beam splitting solar system

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An effective thermodynamic transformation analysis method for actual irreversible cycle

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science china(Technological sciences) 2013年第11期56卷 2188-2193页

作者： chen zeshao XIE WenHai hu peng JIA Lei SHI Min department of thermal science & energy engineering University of Science and Technology of China State Key Laboratory of Compressor technology Hefei Institute of General Machinery

An effective thermodynamic transformation analysis method was proposed in this study. According to the phenomenon of ex- ergy consumption always coupling with heat transfer process, the effective thermodynamic temperatures were defined, then the actual power cycle or refrigeration/heat pump cycle was transformed into the equivalent reversible Carnot or reverse Carnot cycles for thermodynamic analysis. The derived effective thermodynamic temperature of the hot reservoir of the equivalent reverse Camot cycle is the basis of the proposed method. The combined diagram of TR-h and TR-q was adopted for the analy- sis of the system performance and the exergy consumption, which takes advantage of the visual expression of the heat/work exchange and the enthalpy change, and is convenient for the calculation of the coefficient of performance and exergy con- sumptions. Take a heat pump water heater with refrigerant of R22 for example, the proposed method was systematically intro- duced, and the fitting formulas of the effective thermodynamic temperatures were given as demonstration. The results show that the proposed method has advantage and well application foreground in the performance simulation and estimation under the variable working conditions.

关键词： irreversible thermodynamic cycle effective thermodynamic transformation analysis effective thermodynamic temper-ature heat pump water heater exergy analysis

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