UGC Approved Journal no 63975(19)

ISSN: 2349-5162 | ESTD Year : 2014
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Published in:

Volume 7 Issue 12
December-2020
eISSN: 2349-5162

UGC and ISSN approved 7.95 impact factor UGC Approved Journal no 63975

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Published Paper ID:
JETIR2012202


Registration ID:
304441

Page Number

10-19

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Title

NUMERICAL INVESTIGATION FOR HEAT TRANSFER FROM LIQUID METAL TO AIR AND NITROGEN IN SERPENTINE COIL HEAT EXCHANGER

Abstract

State-of-the-art solar thermal power plants use thermal oils, water/steam, air or molten salts as heat transfer fluids (HTF). Oils can typically not operate at temperatures that would allow for high efficiency in the thermal-to-electric power conversion process. Solar salt melts at 220 °C. Under strong solar irradiation, it can be operated up to an outlet bulk temperature of 565 °C, but not higher in order to avoid film temperatures above 600 °C where it chemically decomposes. Advanced heat transfer fluids should have a low melting and a high boiling temperature resulting then in an increased operating temperature range. Pure liquid metals and their alloys have high thermal conductivities and thus show high potential for large heat transfer rates. Earlier authors carried out detailed study on screening of liquid metal candidates as advanced heat transfer fluids in solar power systems and concluded that the candidates with the highest potential are sodium, lead-bismuth eutectic alloy (LBE) and tin. In the present study a parallel flow serpentine coil heat exchanger is investigated numerically using Ansys CFX CFD Software for heat transfer between hot liquid metals, sodium and sodium potassium eutectic at 900 K and 600K and cold fluid air or nitrogen at inlet temperature of 310K.Cold fluid mass flow rate is varied from 0.5 to 2.5 Kg/Sec while hot fluid mass flow is kept constant at 5 Kg/Sec. Heat balance check is carried out for each CFD simulation and is found to be below allowable deviation of 5% . Overall heat transfer coefficient and cold fluid heat transfer coefficient increased linearly as the cold fluid mass flow rate increased for both liquid metals (sodium and sodium potassium eutectic), Sodium potassium eutectic shows slightly higher values compared to sodium liquid metal, nitrogen performed better when compared to air with both liquid metals (at 900 K and 600K). The outlet temperatures of cold fluids are high at 0.5 Kg/s, and are less at higher cold fluid mass flow rates of 2.5 Kg/s. Air outlet temperatures are high compared to nitrogen for both liquid metals at 600 K and 900 K. Nusselt number of both hot fluid and cold fluid increased when the cold fluid mass flow rate is increased. Nitrogen is having higher Nusselt numbers compared to air at both 600 K and 900 K. whereas sodium potassium is having higher Nusselt numbers compared to sodium at both 600 K and 900 K.

Key Words

liquid metals, shell and serpentine coil heat exchanger, Sodium, Sodium potassium eutectic, Concentrated Solar power Technologies.

Cite This Article

"NUMERICAL INVESTIGATION FOR HEAT TRANSFER FROM LIQUID METAL TO AIR AND NITROGEN IN SERPENTINE COIL HEAT EXCHANGER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 12, page no.10-19, December-2020, Available :http://www.jetir.org/papers/JETIR2012202.pdf

ISSN


2349-5162 | Impact Factor 7.95 Calculate by Google Scholar

An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 7.95 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator

Cite This Article

"NUMERICAL INVESTIGATION FOR HEAT TRANSFER FROM LIQUID METAL TO AIR AND NITROGEN IN SERPENTINE COIL HEAT EXCHANGER", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 12, page no. pp10-19, December-2020, Available at : http://www.jetir.org/papers/JETIR2012202.pdf

Publication Details

Published Paper ID: JETIR2012202
Registration ID: 304441
Published In: Volume 7 | Issue 12 | Year December-2020
DOI (Digital Object Identifier):
Page No: 10-19
Country: VIZIANAGARAM, ANDHRA PRADESH, India .
Area: Engineering
ISSN Number: 2349-5162
Publisher: IJ Publication


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