Thermal Science最新文献_第5页

Operational characteristics of the CHP plant in the district heating system of Belgrade 贝尔格莱德区域供热系统热电联产电厂的运行特点

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230405158t

V. Tanasić, N. Tanasić, M. Stamenić

{"title":"Operational characteristics of the CHP plant in the district heating system of Belgrade","authors":"V. Tanasić, N. Tanasić, M. Stamenić","doi":"10.2298/tsci230405158t","DOIUrl":"https://doi.org/10.2298/tsci230405158t","url":null,"abstract":"The combined production of electricity and thermal energy (CHP or cogeneration) is the most efficient and convenient approach to reduce costs for energy at industrial power plants and district heating plants that use natural gas as fuel to produce thermal energy for various needs. This paper analyses the operational characteristics of the CHP plant, which has been operating since January 1, 2021, at the Vozdovac Heating Plant as part of the Belgrade district heating system. The CHP plant consists of three gas engine units with a total nominal electric power of 10 MW and thermal power of 10.1 MW, which use natural gas as fuel. The CHP plant is used for district heating and preparing domestic hot water (DHW) while electricity is sold to the local electric grid. The analysis in this paper focuses on the plant's operational characteristics: the number of working hours, the total energy consumption and energy production, the efficiency as well as the operational and maintenance costs. Also, the impact of the drastic changes in the prices of natural gas, electricity, and maintenance costs in the last year on the financial profitability of the CHP plant was analysed in particular.","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":"68263511","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 solution for stochastic heat equation with Neumann boundary conditions 具有Neumann边界条件的随机热方程的数值解

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1057r

S. Raja Balachandar, D. Uma, H. Jafari, S. Venkatesh

引用次数: 0

Local meshless collocation scheme for numerical simulation of space fractional PDE 空间分数阶偏微分方程数值模拟的局部无网格配置方案

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1101s

M. Shakeel, M. Khan, I. Ahmad, H. Ahmad, Nantapat Jarasthitikulchai, W. Sudsutad

引用次数: 7

Analytical and computational results for boundary-layer equations in porous medium 多孔介质边界层方程的解析与计算结果

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1163a

Iftikhar Ahmad, Aziz Khan, K. Shah, T. Abdeljawad, S. Islam

引用次数: 0

Regularity for a non-local diffusion equation with Riemann-Liouville derivative 一类具有Riemann-Liouville导数的非局部扩散方程的正则性

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci23s1373t

N. Tuan, Devendra Kumar, Anh Nguyen

引用次数: 0

Numerical simulation of the gas flow through the rectangular channel with perforated plate 穿孔板矩形通道内气体流动的数值模拟

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220426089m

Z. Marković, M. Eric, R. Jovanović, I. Lazović

{"title":"Numerical simulation of the gas flow through the rectangular channel with perforated plate","authors":"Z. Marković, M. Eric, R. Jovanović, I. Lazović","doi":"10.2298/tsci220426089m","DOIUrl":"https://doi.org/10.2298/tsci220426089m","url":null,"abstract":"The perforated plates are commonly used for gas flow control in the wide-angle diffusers of electrostatic precipitators of large power plants. Many studies dealt with the investigation of the effects of the perforated plate?s geometry on flow parameters in the cases where incoming flow is perpendicular to the plate and the plate is covering the whole cross-section of the flowing channel. These results are partially applicable in cases where flow is inclined on the plate or when the plate is not occupying the whole cross-section of the channel. The subject of this work is a numerical investigation of flow through the rectangular channel with a perforated plate in various positions in the cross-section of the channel. The aim was to investigate the effect of the plate position on the flow. The perforated plates were modeled as thin porous media of finite thickness by using the directional loss model. Numerical experiments are carried out by using Computational Fluid Dynamics software Ansys CFX. Results of pressure drop and velocity distribution behind the plate are compared to the results of CFD simulation of the full 3D plate model. In order to obtain a reasonable agreement both of the pressure drop and velocity distribution behind the plate when using a simplified thin porous plate model, the value of streamwise permeability of the plate had to be adjusted. The level of adjustments has determined iteratively and it depends on the plate position in the channel?s cross-section.","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":"68242276","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

Examination of Stirling engine parameters effect on its thermal efficiency using PROSA software 利用PROSA软件研究斯特林发动机参数对热效率的影响

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220617139r

Louiza Rabhi, H. El, N. Boutammachte, A. Khmou

引用次数: 0

Analyze two-dimensional heat transfer of ultrafast laser heated thin films under siz effects 分析了尺寸效应下超快激光加热薄膜的二维传热特性

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220819043m

Yudong Mao, Guochen Zhao, Mingzhi Yu, Xianzheng Wang, Jin Li, Kaimin Yang, Shouyu Liu

{"title":"Analyze two-dimensional heat transfer of ultrafast laser heated thin films under siz effects","authors":"Yudong Mao, Guochen Zhao, Mingzhi Yu, Xianzheng Wang, Jin Li, Kaimin Yang, Shouyu Liu","doi":"10.2298/tsci220819043m","DOIUrl":"https://doi.org/10.2298/tsci220819043m","url":null,"abstract":"An improved dual-phase-lagging (DPL) model which reflects size effects caused by nanostructures is utilized to investigate the two-dimensional thermal conduction of nano silicon films irradiated by ultrafast laser. The integral transformation method is used to solve the conduction governing equation based on the improved DPL model. The variation of the internal temperature along the thickness direction and the radial direction of the thin film is analyzed. We find that the temperature increases rapidly in the heated region of the film, and as time goes by, the energy travels from the heated end to another end in a form of wave. Although both the improved DPL model and the DPL model can obtain similar thermal wave temperature fields, the temperature distribution in the film obtained by the improved DPL model is relatively flat, especially for high Knudsen number. Under the same Knudsen number, the temperature obtained by the two-dimensional improved DPL model is higher than that obtained by the one-dimensional model, and the temperature difference becomes larger and larger as time elapses.","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":"68246522","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

Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation 高能激光辐照下模拟月球岩石破坏特性及机理的实验研究

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220807003z

Xuemin Zhou, Chuo Zhang, Junjun Liu, Haiyong Hao, Zheng Gao, Yan Wu, Qiu-Yue Li, Xiang Wen, Xuan Wang, Zhaoliang Yang

{"title":"Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation","authors":"Xuemin Zhou, Chuo Zhang, Junjun Liu, Haiyong Hao, Zheng Gao, Yan Wu, Qiu-Yue Li, Xiang Wen, Xuan Wang, Zhaoliang Yang","doi":"10.2298/tsci220807003z","DOIUrl":"https://doi.org/10.2298/tsci220807003z","url":null,"abstract":"The large load and poor heat dissipation of moon rock core drilling leads to the difficulty of rock breaking and low drilling and sampling efficiency. As a new auxiliary rock breaking method, laser rock breaking is expected to be applied to perturbation sampling in lunar rock drilling. Revealing the fracture characteristics and mechanism of rock under laser irradiation is an important basis for realizing laser-assisted lunar rock sampling. Basalt was used as simulated lunar rock sample, and its mechanical response characteristics under laser irradiation were analyzed from macro to micro point of view, and the failure law under different laser power and different irradiation time was explored. The results show that the failure of the sample under laser irradiation is mainly characterized by local rock melting and dynamic crack propagation, and the surface temperature of the sample follows the characteristics of Gaussian distribution. The laser power has a greater influence on the degree of rock weakening than the irradiation time. Laser irradiation of rocks can significantly reduce rock strength, and has obvious effects on improving rock breaking efficiency and reducing in situ disturbance. It is expected to provide theoretical and technical support for assisting lunar rock drilling and sampling in the future.","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":"68246647","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: 1

A novel coupling discretization method for modeling multi-phase heat exchangers 一种新的多相换热器耦合离散化建模方法

IF 1.7 4区工程技术

Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci220909044c

Zhenhao Chu, Daocang Che, Zhaowang Xia

引用次数: 0