Improving the phase transition characteristic and latent heat storage efficiency by forming polymer-based shape-stabilized PCM for active latent storage system

Rahmalina, Dwi; Rahman, Reza Abdu; Ismail, Ismail

doi:10.1016/j.csite.2022.101840

Cited by 27 publications

(11 citation statements)

References 33 publications

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“…The manufacture of micro components through machining must use a specific technology because of the high demand for quality and the final specifications of the produced components [5]. Moreover, with the high demands for the fulfillment of sustainable manufacture and energy saving, the entire pro duction process must be considered according to those aspects [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and experimental evaluation of machining parameters for 2-dimensions ultrasonic-assisted micro-milling at low and high-speed machining

et al. 2022

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Vibration assisted machining (VAM) is one of the hybrid machining processes for improving the machined surface quality. VAM performance is mainly influenced by the combination of machining and vibration control parameters, where surface roughness value (Ra) became the benchmarking indicator. It is difficult to determine the optimum parameter combination to produce high precision products, especially for micro-milling, due to the interconnected correlation among parameters. The benefits of high-speed machining with VAM are high material removal rate and shorter machining time than low-speed machining. VAM operation at high-speed machining is still limited due to the high possibility of chatter occurrence. Therefore, this research aims to evaluate the 2D VAM resonant performance at low-speed and high-speed machining, operated at ultrasonic vibration and amplitude below one μm. The mathematical model and experimental evaluate the vibration effect based on machining mode, amplitude, and spindle speed variation. The mathematical modelling and experiment result complement each other, where the mathematical model can characterize the effect of resonant vibration, amplitude, and spindle speed increment on the tool path trajectory. The 2D resonant vibration at the feed direction causes interrupting cutting and transforms the tool path trajectory from linear to wavy. The mathematical model and experiment result show the dominant influence of spindle speed and feed rate on the toolpath trajectory and Ra, where low spindle speed and feed rate result in better machine surface roughness. The low-speed machining with VAM results in Ra value between 0.1–0.155 μm, which is below the high-speed machining result, between 0.2–0.38 μm

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Section: Introductionmentioning

confidence: 99%

Numerical modeling and experimental evaluation of machining parameters for 2-dimensions ultrasonic-assisted micro-milling at low and high-speed machining

et al. 2022

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“…As seen in Fig. 5, the preheating rate occurs longer than phase 1 because of the quality of the produced oil, which is waxy crude oil where the thermal characteristic of the oil is extremely low [19]. Apart from this, improvements in the pipeline from the burner to the FWKO reduced heat losses from the hot fluid, with the average temperature loss falling to 4.3 °C.…”

Section: Fig 4 1 St Phase Experimentsmentioning

confidence: 99%

“…The method is expected to develop and adapted for oil production across the globe. Furthermore, the design is expected Engineering to use external heat sources from waste heat [18] or solar power (concentrated solar power) [19]. Thus, it will help develop a green production system in oil production to minimize the environmental effect (besides the produced oil itself).…”

Section: Introductionmentioning

confidence: 99%

Development of free water knock-out tank by using internal heat exchanger for heavy crude oil

2022

Self Cite

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Reactivation of an old oil well can be explicitly calculated to maximize crude oil production. The biggest challenge with the activation process is the crude oil content in old wells, which is not feasible to meet the specified minimum standards. In the case of the Bunian oil field, Indonesia, the crude oil produced has high water content. It causes a decrease in the quality of production and also hinders production capacity. The production scheme applied to the Bunian field has a storage tank that functions to reduce water content using the gravity method, but this is less effective. Let’s modify the storage tank into a heat exchanger tank through the engineering design process and labeled it as a free water knockout tank (FWKO). The FWKO is made of a multi-pass tube heat exchanger. The experiments are conducted through three phases’ tests before deciding the final design. From the test, the change in water content is varied with temperature differences of the working fluid and crude oil. The lowest water content is obtained at 0.5 % at final tests. After analyzing the characteristic of each test result, the final design is taken by adjusting the suitable working fluid temperature and pressure. Finally, by using suitable parameters, the average water content of crude oil is decreased up to the minimum requirement (<0.1 %). The design of FWKO is considered simple with an excellent performance and can adapted easily. The FWKO able to process crude oil with water content <20 %, where it suitable for waxy oil well. The working fluid can be processed both in liquid and gas state. Furthermore, the heating source for the working fluid is gained from the gas flare by using thermic heater. Thus, it does not require an extra heating source for the heat exchanger

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“…Generally, CPCM has been prepared with the supporting materials and thermal conductivity additives to the phase-change materials to enhance their leakage resistance and thermal conductivity. − Polymers have been widely used in BTMS for their low cost and well supporting performance. − Among them, styrene butadiene styrene block copolymer (SBS), as a typical thermoplastic elastomer, can serve as a supporting material for PA, effectively preventing its leakage at high temperatures. Huang et al found that the preparation CPCM may be made easier by immersing SBS in a carbon tetrafloride (CCl 4 ) solution.…”

Section: Introductionmentioning

confidence: 99%

Thermal Management System with Intrinsically High Thermal Conductive and Antileakage Composite Phase-Change Materials for Battery Module

Liu,

Deng,

Yang

et al. 2024

ACS Appl. Energy Mater.

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Phase-change materials with high latent heat can release and absorb large amounts of heat, which has potential application in various fields such as energy storage, electronic devices, and electrical vehicles (EVs). However, there is still a need to improve thermal conductivity and antileakage performances. Herein, a threedimensional (3D) metal−organic hydrogel (HGL) has been prepared by chelating metal ions and organic acids, and the composite phase-change material (CPCM) containing paraffin, HGL and styrene-butadiene-styrene block copolymer (SBS) and expanded graphite (PSHE) is designed and prepared. The experimental results show that PSHE exhibits high thermal conductivity (1.64 W/m•K), good thermal stability (98.68%), and super enthalpy (185.4 J/g). It is contributed that the presence of zinc ions in HGL with 3D structure can not only reduce the leakage of PA at high temperature but also improve the thermal conductivity of CPCM. Especially, PSHE2 with HGL: SBS exhibits optimum thermal conductivity at 1:1 ratio, which improves nearly five times than that of PA. Additionally, even at 2 C discharge rate, the maximum temperature (T max ) and maximum temperature difference (ΔT max ) of battery module with PSHE2 can be controlled below 45.6 and 3.5 °C, respectively. It reveals that PSHE2 can guarantee the long-term cycling stability and thermal stability. Thus, this research can elucidate intrinsically high thermal conductivity and thermal stability CPCM, which has great prospect for next-generation energy storage and EVs fields.

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Improving the phase transition characteristic and latent heat storage efficiency by forming polymer-based shape-stabilized PCM for active latent storage system

Cited by 27 publications

References 33 publications

Numerical modeling and experimental evaluation of machining parameters for 2-dimensions ultrasonic-assisted micro-milling at low and high-speed machining

Numerical modeling and experimental evaluation of machining parameters for 2-dimensions ultrasonic-assisted micro-milling at low and high-speed machining

Development of free water knock-out tank by using internal heat exchanger for heavy crude oil

Thermal Management System with Intrinsically High Thermal Conductive and Antileakage Composite Phase-Change Materials for Battery Module

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