Performance evaluation of simple DPHX with helical baffles in annulus side

Abstract

In this paper, turbulent thermo-hydraulic analysis of water-to-water passively augmented DPHX with helical baffles is studied by varying the parameters, mass flow rate and baffle spacing. The baffles in annulus side of the inner pipe augments the rate of heat transfer on comparing with the simple DPHX. The influence of spacing between baffles on the heat transfer rate is investigated by varying the governing parameters. The Reynolds number is varied between 22,000 and 12, 5000 for three different baffle spacing (β) values of 75 mm, 100 mm and 125 mm. The thermo-hydraulic performance parameters pressure drop, Nusselt number and friction factor are examined and put forth corresponding to experimental data. From the results, it is inferred that the effect of baffles on the annulus side of the hot fluid flows through the inner pipe enhances heat transfer rate with increase in the Nu and decreases as the baffle spacing increases.

Desain Direct Contact Heat Exchanger (Dche) Pada Unit Masakan Defekasi - Remelt - Karbonatasi (Drk) Di Pg Kebon Agung Malang

“…Ukuran diameter dari annulus diasumsikan bernilai sama dengan diameter dari baffle bawah peralatan DCHE yang digunakan dengan tujuan untuk mendapatkan pressure drop yang serendah mungkin. Pressure drop pada bagian annulus akan meningkat seiring dengan adanya peningkatan spacing atau diameter dari baffle yang digunakan [17]. Jika ukuran dari annulus semakin kecil maka kecepatan aliran akan semakin meningkat, sehingga ada peningkatan bilangan Reynolds.…”