Given models linking flow resistance and fouling resistance it becomes possible to simulate the effects of fouling on the hydraulic performance of a refinery pre-heat train. Such a simulation has been used here to identify when plant throughput will be limited by pressure drop; how throughput can be improved through the cleaning of individual exchangers and groups of exchangers; and how much pr...

A moving window decision-making algorithm is proposed for the cleaning schedule optimization of heat exchanger network system subject to fouling in refinery crude preheat train. This designed by incorporating scheme into a conventional multi-period optimal control problem (OCP) framework and has distinct feature that it can efficiently handle complex where long-time horizon considered. When com...

The asymptotic structure of laminar, moderately rich, premixed methane flames is analyzed using a reduced chemical-kinetic mechanism comprising four global reactions. This reduced mechanism is different from those employed in previous asymptotic analyses of stoichiometric and lean flames, because a steady-state approximation is not introduced for CH3. The aim of the present analysis is to devel...

Rapid investment casting merupakan teknik produksi yang mengabungkan teknologi manufaktur aditif dan pengecoran memiliki tujuan dapat membuat objek dengan bentuk kompleks biaya relatif rendah, serta fleksibilitas dalam berbeda tanpa harus menambah tambahan.. Logam populer digunakan industri perhiasan logam paduan dari jenis perak, emas, atau platinum. Perak karena sifatnya duktil sifat permukaa...

Abstract To solve the problems of electromagnetic heating cigarette devices in speed and temperature control accuracy, optimization system was carried out based on current device. And special for device designed, which powered by a lithium battery designed with half-bridge push-pull double resonant capacitor. According to test, prototype can preheat at 350 °C 7 seconds fastest, an average rate ...

It is anticipated that laser cladding assisted with preheat (LCAP)-deposited Tribaloy (T-800) composite coatings enhances resistance to structural degradation upon exposure elevated-temperature oxidation service environments. The kinetics of LCAP T-800 deposited on EN8 substrate and its mechanisms have not been explored in severe conditions are similar operational parameters. isothermal behavio...

Breathing wall (BW) based on air-permeable porous medium offers an alternative solution for utilizing the conductive heat loss of building envelope to preheat infiltration ventilation airflow within medium. However, current studies neglect influence pressure drop energy performance BW, which may lead overestimation or non-optimal design. In this study, we proposed a framework determine critical...