Thermal Science最新文献_第10页

Low-carbon agricultural development in China a promising cure for global warming 中国低碳农业发展有望治愈全球变暖

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303173h

Kunpeng Huang, Mingzheng Xiao

引用次数: 0

Research on energy saving and emission reduction for rural tobacco curing 农村烤烟节能减排研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303771l

E. Liu, Wenyun Zhang, Xiaoyang Gao, Zhanghui Guo, Biao Qi

引用次数: 0

He-Laplace method for time fractional burgers-type equations 时间分数汉堡型方程的He-Laplace方法

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2303947c

Bin Chen, Lei Chen, Zhongze Xia

引用次数: 3

Thermal characteristics of combined compressor - ejector refrigeration/heat pump systems for HVAC&R HVAC&R用压缩机-喷射器组合制冷/热泵系统的热特性

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230513182g

Aleksandar Gjerasimovski, Maja Sharevska, Natasha Gjerasimovska, Monika Sharevska, Risto Filkoski

{"title":"Thermal characteristics of combined compressor - ejector refrigeration/heat pump systems for HVAC&R","authors":"Aleksandar Gjerasimovski, Maja Sharevska, Natasha Gjerasimovska, Monika Sharevska, Risto Filkoski","doi":"10.2298/tsci230513182g","DOIUrl":"https://doi.org/10.2298/tsci230513182g","url":null,"abstract":"Thermal characteristics of combined compressor - ejector refrigeration/heat pump systems applied in heating, ventilation, air conditioning and refrigeration (HVAC&R) of buildings are investigated. An original model for estimation of the thermal characteristics of the combined cycles is developed, to determine the influence of the evaporation, interstage, condensation, and generating temperature conditions on mechanical and thermal COPs of the combined system, and to optimize the thermal parameters of the cycle. Results are presented for different temperature conditions, with R134a as a suitable refrigerant. A comparison between the thermal characteristics of the simple mechanical vapor compression cycle, the simple ejector thermocompression cycle, and the combined compressor - ejector refrigeration / heat pump cycle is given. The benefits of implementation of combined compressor - ejector refrigeration/heat pump cycles in HVAC&R systems are discussed. The temperature lift or temperature difference between condensing temperature and interstage temperature significantly influences the thermal (ejector) coefficient of performance. If temperature lift is between 10 K and 20 K, high values of thermal COPs can be achieved (0.5?1.0, for generating temperature equal to 80?C; 1.0?1.8, for generating temperature equal to 120?C); If temperature lift is between 30 K and 40 K, very low values of COPth can be obtained (0.05?0.3). High values of mechanical COPs can be achieved (24.8?6.9), for compressor stage temperature lift 10?30 K.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"17 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68263909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulations of time-fractional PDES arising in mathematics and physics using the local Meshless differential quadrature method 用局部无网格微分正交法对数学和物理中出现的时间分数阶偏微分方程进行数值模拟

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1263a

Bander N. Almutairi, I. Ahmad, Bandar Almohsen, H. Ahmad, D. Ozsahin

引用次数: 5

Defect detection of GFRP laminates by barker codedmodulation excitation infrared thermal imaging 基于巴克码调制激发红外热成像的GFRP层压板缺陷检测

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220807002t

Q. Tang, Ling Ran, Ze-Shen Qu, Chi-Wu Bub

引用次数: 0

Simulation and modeling of a solar-aided underground energy storage system 太阳能辅助地下储能系统的仿真与建模

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220913025s

Özdamar Sağlam, Seyit Özdamar, S. Mert

{"title":"Simulation and modeling of a solar-aided underground energy storage system","authors":"Özdamar Sağlam, Seyit Özdamar, S. Mert","doi":"10.2298/tsci220913025s","DOIUrl":"https://doi.org/10.2298/tsci220913025s","url":null,"abstract":"The significance of energy storage methods and related R&D studies are increasing due to the depletion of fossil fuels, rising energy prices, and growing environmental concerns. Storage of energy means elimination of practical concerns for the time difference between the time when the energy is produced and when it?s needed. The importance of producing and storing energy through renewable sources is increasing every day, especially in developing countries like T?rkiye, as such countries would like to reduce their dependence on foreign sources. This study focuses on an UTES (Underground Thermal Energy Storage) system that was modeled for Van Region, using M-file program. The performance of an isolated day heat system as a TES was investigated, and the thermal energy storage capacity of the system was researched for a 5x5x5 m soil area located on the Van Yuzuncu Yil University Campus. The temperature distribution, heat loss, and efficiency calculations were performed for a complete year and 3D representations of the findings were obtained. The lowest efficiencies were observed in May, while the highest efficiencies were observed in July. It was found that the maximum heat loss from the system took place during December and January, and the system could be easily and effectively become a heating source for a single household with the addition of a heat pump.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68248107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the simplified model of vertical double U-pipe ground heat exchanger 立式双u型管地下换热器简化模型研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220922048w

Xin Wang, Qiang Fu, Changlong Wang

引用次数: 0

Experimental and numerical investigation of driving potential of biomass-pellet hot air generator for coupling with absorption heat pump 生物质颗粒热风发生器与吸收式热泵耦合驱动潜力的实验与数值研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221103068i

{"title":"Experimental and numerical investigation of driving potential of biomass-pellet hot air generator for coupling with absorption heat pump","authors":"","doi":"10.2298/tsci221103068i","DOIUrl":"https://doi.org/10.2298/tsci221103068i","url":null,"abstract":"This paper presents a numerical and experimental study of a heating system that consists of Hot Air Generator driven by biomass pellet burner to drive the NH3-H2O absorption heat pump made by Robur. The aim of this work is to fully test the system of Hot Air Generator for thermal potential, by developing a thermal field, while driving the absorption heat pump of medium capacities for residential purposes, and to make model of predicting the efficiencies of heating comparing to conveyed heat in desorber of absorption heat pump. Numerical simulations of the Hot Air Generator were performed in the commercial software Ansys Fluent and CFX. The experimental part was carried out in the laboratory of the Faculty of Mechanical Engineering in Nis, where the temperature and velocity measurements were obtained and compared to numerical results. Results were obtained for mass airflow through the Hot Air Generator and desorber of 0.17 and 0.2552 kg/s, pellet burner power of 15, 18, 21, 24, 27 and 30 kW, with air inlet temperature in desorber of around 89 to 140 ?C. and . The heating efficiency of the absorption heat pump goes from 1.01 to 1.37. The heat loss over the surfaces of Hot Air Generator goes from 0.6 to 0.9 kW depending on ambient air and surface temperatures. The system has the potential to be applied in low-temperature heating and the spare heat from combustion products and residual hot air can be used for different purposes.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68249713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of O2/CO2 combustion in decomposition furnace 分解炉中O2/CO2燃烧的数值模拟

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci221217073w

Bo Wang, H. Kao

{"title":"Numerical simulation of O2/CO2 combustion in decomposition furnace","authors":"Bo Wang, H. Kao","doi":"10.2298/tsci221217073w","DOIUrl":"https://doi.org/10.2298/tsci221217073w","url":null,"abstract":"The cement industry has become the second largest source of CO2 and NOx emissions after the power industry, it is imperative to reduce CO2 and NOx emissions. O2/CO2 combustion technology can achieve CO2 enrichment and NOx reduction. As a result, its application possibilities are bright. In this article, a TTF-type decomposition furnace serves as the research object for a CFD simulation. In addition, the effects of pulverized coal combined O2/N2 and pulverized coal mixed O2/CO2 combustion on the velocity field, temperature field, material component, and NOx concentration distribution in the furnace are investigated concerning the changes of kinetic parameters of CaCO3 decomposition under different working conditions. Compared with the O2/N2 atmosphere, the temperature distribution in the high-temperature zone of the decomposition furnace is more uniform under the O2/CO2 atmosphere. The temperature range is reduced in the area of extremely high temperatures. The NOx concentration at the decomposition furnace exit is reduced by 37%. The high concentration of CO2 at the output can be recycled and reused to reduce the greenhouse effect effectively. In addition, the high CO2 partial pressure increases the exit temperature by 111 K, doubles the O2 concentration, but decreases the raw meal decomposition rate from 95.9% to 82.2%. The process parameters must be improved to adapt to the O2/CO2 combustion technology.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68250786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0