{"title":"推导了平行流布置双管换热器的ntu效率公式","authors":"E. Moftah, Ahmad Abdelaly","doi":"10.37376/1571-000-044-005","DOIUrl":null,"url":null,"abstract":"Abstract: In Heat Exchangers text books, the derivation of the effectiveness( )and the number of transfer units( NTU ), (ε-NTU) relations, are based on figures which are difficult to understand and the physical meaning of the steps in the derivation is unclear. The NTU-Effectiveness heat exchanger design formula for the double pipe heat exchanger in parallel flow arrangement is derived from the first principles. Energy equations of parallel flow arrangement for both the hot and the cold fluids are determined. The actual rate of heat transfer for parallel flow arrangement along with the heat exchanger effectiveness are stated. The relationship between the effectiveness( )and the number of transfer units( NTU ) for the double pipe heat exchanger in parallel flow arrangement is plotted.","PeriodicalId":15739,"journal":{"name":"Journal of emerging technologies and innovative research","volume":"33 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Derive the NTU-Effectiveness Formula for the Double Pipe Heat Exchanger in Parallel Flow Arrangement\",\"authors\":\"E. Moftah, Ahmad Abdelaly\",\"doi\":\"10.37376/1571-000-044-005\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Abstract: In Heat Exchangers text books, the derivation of the effectiveness( )and the number of transfer units( NTU ), (ε-NTU) relations, are based on figures which are difficult to understand and the physical meaning of the steps in the derivation is unclear. The NTU-Effectiveness heat exchanger design formula for the double pipe heat exchanger in parallel flow arrangement is derived from the first principles. Energy equations of parallel flow arrangement for both the hot and the cold fluids are determined. The actual rate of heat transfer for parallel flow arrangement along with the heat exchanger effectiveness are stated. The relationship between the effectiveness( )and the number of transfer units( NTU ) for the double pipe heat exchanger in parallel flow arrangement is plotted.\",\"PeriodicalId\":15739,\"journal\":{\"name\":\"Journal of emerging technologies and innovative research\",\"volume\":\"33 1\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2018-03-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of emerging technologies and innovative research\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.37376/1571-000-044-005\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of emerging technologies and innovative research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.37376/1571-000-044-005","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Derive the NTU-Effectiveness Formula for the Double Pipe Heat Exchanger in Parallel Flow Arrangement
Abstract: In Heat Exchangers text books, the derivation of the effectiveness( )and the number of transfer units( NTU ), (ε-NTU) relations, are based on figures which are difficult to understand and the physical meaning of the steps in the derivation is unclear. The NTU-Effectiveness heat exchanger design formula for the double pipe heat exchanger in parallel flow arrangement is derived from the first principles. Energy equations of parallel flow arrangement for both the hot and the cold fluids are determined. The actual rate of heat transfer for parallel flow arrangement along with the heat exchanger effectiveness are stated. The relationship between the effectiveness( )and the number of transfer units( NTU ) for the double pipe heat exchanger in parallel flow arrangement is plotted.
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