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Progress on Heat Transfer in Fractures of Hot Dry Rock Enhanced Geothermal System

Energy Engineering 2021年第4期118卷 797-823页

作者： Yiya Wang Hailong Yu Shucheng Wu Li Liu Liuyang Huang Baozhong Zhu Yunlan Sun Enhai Liu School of Petroleum Engineering Changzhou UniversityChangzhouChina

Hot Dry Rock(HDR)is the most potential renewable geothermal energy in the *** Geothermal System(EGS)is the most effective method for the development and utilization of HDR resources,and fractures are the main flow channels and one of the most important conditions for studying heat transfer process of ***,the heat transfer process and the heat transfer mechanism in fractures of EGS have been the hot spots of *** to the particularity of the mathematical models of heat transfer,research in this field has been at an exploratory stage,and its methods are mainly experimental tests and numerical *** paper introduces the progress on heat transfer in fractures of Hot Dry Rock EGS in detail,provides a comparative analysis of the research results and prospects for future research directions:It is suggested that relevant scholars should further study the mathematical equations which are applicable to engineering construction of seepage heat transfer in irregular fractures of the rock mass,the unsteady heat transfer process between multiple fractures of the rock mass and the heat transfer mechanism of the complex three-dimensional models of EGS.

关键词： Hot Dry Rock seepage heat transfer mathematical equations numerical simulation fractures

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Fruit Mass of <i>Carica papaya</i>L. from Cultivars Aliança and THB from the Width and Length of the Fruit

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Agricultural Sciences 2021年第1期12卷 9-17页

作者： Karina Tiemi Hassuda dos Santos Vinicius de Souza Oliveira Gleyce Pereira Santos Jéssica Sayuri Hassuda Santos Omar Schmildt Edilson Romais Schmildt Federal University of Espírito Santo Center Noth of Espírito Santo S&#227 o Mateus Espírito Santo Brazil Federal University of Espírito Santo Center for Agricultural Sciences and Engineering Alegre Espírito Santo Brazil

Papaya (Carica papaya L.) is a typical plant with a tropical climate, but also grown in subtropical regions. Using mathematical models well-adjusted allows with good precision to estimate characteristics of interest. The objective was to adjust an equation that estimates the fruit mass for each cultivar of papaya, Aliança and THB, using only one measure, length or width. The experiment was conducted in the municipality of Linhares in the state of Espírito Santo, Brazil. Seedlings were planted on the same day, spaced 3.6 × 1.5 m and in rows side by side. Initially, the equations were modeled, they were linearized and then the covariance analysis was performed in order to verify the possibility of an equation that would serve both cultivars. As the covariance was significant, it was necessary to develop equations for each cultivar. To obtain the growth equations, 350 fruits of cultivar Aliança and 550 of THB were used. The validation was performed with 50 fruits of each. The characteristics evaluated were the largest width (W in mm), the longest fruit length (L, in mm) and the observed mass (OM in g). The equations that best fit were those of the power model that use width (W) as an independent variable.

关键词： Non-Destructive Method Regression Validation mathematical equations Growth Modeling

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