• GUNJA BINDU SARIKA
• V. MANI KUMAR

Three variants of shell and tube heat exchangers with zero, six and eight helical baffles are investigated in the present study for the heat transfer performance with hot molten salt flowing in the tube at inlet temperatures 838K and 563K and cold thermal oil flowing in the shell. Three types of thermal oils namely Exceltherm SST, LV1 and MK1 were analysed for relative performance. It was observed that the temperature increases rapidly with increase in the number of helical baffles and higher temperatures are realised for all three oils for Solar Salt at 838K compared to Solar Salt at 563K. The possible reason could be due to restricted passages created between the baffles (with higher number of baffles) causing the cold fluid flowing in the shell having better contact with the hot fluid flowing in the tubes. The restricted passages result in higher velocities in between baffles and causes better heat transfer. Solar Salt and oil Exceltherm SST combination has the highest Nusselt Number and overall heat transfer coefficient (OHTC) among the three oils investigated and further the difference in OHTC for the three oils is marginal and also no significant changes in the value is noticed for Solar Salt at 563K and 838K. In view of oil Exceltherm SST having highest Nusselt number and OHTC, using oil Exceltherm SST would be better option for heat exchangers designed for maximum heat transfer coefficient. However, when higher outlet temperatures are desirable, oil Exceltherm MK1 would be a better option though it has lower OHTC and Nusselt number.

Continuous helical baffles, Shell and tube heat exchangers, Molten Salts, Thermal Oils, Concentrated Solar power Technologies.

"NUMERICAL ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER WITH CONTINUOUS HELICAL BAFFLES BY USING MOLTEN SALTS AND THERMAL OILS ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 9, page no.1064-1071, September-2020, Available :http://www.jetir.org/papers/JETIR2009144.pdf

"NUMERICAL ANALYSIS OF SHELL AND TUBE HEAT EXCHANGER WITH CONTINUOUS HELICAL BAFFLES BY USING MOLTEN SALTS AND THERMAL OILS ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 9, page no. pp1064-1071, September-2020, Available at : http://www.jetir.org/papers/JETIR2009144.pdf