PERFORMANCE ENHANCEMENT OF TUBE-IN-TUBE HEAT EXCHANGER UTILIZED IN MECHANICAL VAPOR COMPRESSION SYSTEM ALONG WITH ITS SEMI-EMPIRICAL NUSSELT NUMBER

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KHODASHENAS SEYED MOSTAFA; HAJIALIBABAIE MAHSA; KESHAVARZ VALIAN ALI

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Journal: Modares Mechanical Engineering Year:2017 | Volume:17 | Issue:7 Page(s): 257-264

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Information Journal Paper

Title

PERFORMANCE ENHANCEMENT OF TUBE-IN-TUBE HEAT EXCHANGER UTILIZED IN MECHANICAL VAPOR COMPRESSION SYSTEM ALONG WITH ITS SEMI-EMPIRICAL NUSSELT NUMBER

Author(s)

KHODASHENAS SEYED MOSTAFA | HAJIALIBABAIE MAHSA | KESHAVARZ VALIAN ALI | Issue Writer Certificate

Keywords

TUBE-TUBE HEAT EXCHANGERQ1

VAPOR COMPRESSIONQ1

DESALINATION SYSTEMQ1

HEAT TRANSFER COEFFICIENTQ2

Abstract

Vapor compression is an effective method of desalination in a small scale system. Such system has two hot outlet flows. These flows are used to preheat the feed water. In this research, tube-in-tube heat exchanger with different number of inner tubes was designed and constructed as preheater. This heat exchanger contains many inner tubes where each tube is a separate inner flow line for hot flow. Heat exchanger was tested with one, two and three inner tubes. Volumetric flow rates varied from 30 to 120 lit/h in annulus and 20 to 90 lit/h for inner tubes respectively. The results showed that by changing the number of inner tubes from 1 to 3, heat transfer increased 29%. However, 38.4% decrease in equivalent hydraulic diameter led to 22% drop in average Nusselt number. Afterward, a dimensionless coefficient of performance enhancement, defined as the ratio of heat transfer rate variation and the required pumping power, was used to determine number of inner tubes. The results implied that heat exchanger performance improved by increasing the number of inner tubes from 1 to 2. But there is no significant improvement when number of inner tubes changes from 2 to 3. Finally, a semi-empirical equation is presented for determination of Nusselt number in a heat exchanger with two inner tubes. This study indicated that this type of heat exchanger has the best performance for the system within the tested range.

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APA: Copy

KHODASHENAS, SEYED MOSTAFA, HAJIALIBABAIE, MAHSA, & KESHAVARZ VALIAN, ALI. (2017). PERFORMANCE ENHANCEMENT OF TUBE-IN-TUBE HEAT EXCHANGER UTILIZED IN MECHANICAL VAPOR COMPRESSION SYSTEM ALONG WITH ITS SEMI-EMPIRICAL NUSSELT NUMBER. MODARES MECHANICAL ENGINEERING, 17(7 ), 257-264. SID. https://sid.ir/paper/179339/en

Vancouver: Copy

KHODASHENAS SEYED MOSTAFA, HAJIALIBABAIE MAHSA, KESHAVARZ VALIAN ALI. PERFORMANCE ENHANCEMENT OF TUBE-IN-TUBE HEAT EXCHANGER UTILIZED IN MECHANICAL VAPOR COMPRESSION SYSTEM ALONG WITH ITS SEMI-EMPIRICAL NUSSELT NUMBER. MODARES MECHANICAL ENGINEERING[Internet]. 2017;17(7 ):257-264. Available from: https://sid.ir/paper/179339/en

IEEE: Copy

SEYED MOSTAFA KHODASHENAS, MAHSA HAJIALIBABAIE, and ALI KESHAVARZ VALIAN, “PERFORMANCE ENHANCEMENT OF TUBE-IN-TUBE HEAT EXCHANGER UTILIZED IN MECHANICAL VAPOR COMPRESSION SYSTEM ALONG WITH ITS SEMI-EMPIRICAL NUSSELT NUMBER,” MODARES MECHANICAL ENGINEERING, vol. 17, no. 7 , pp. 257–264, 2017, [Online]. Available: https://sid.ir/paper/179339/en

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