Increasing the rating performance of paraffin up to 5000 cycles for active latent heat storage by adding high-density polyethylene to form shape-stabilized phase change material

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

doi:10.1016/j.est.2021.103762

Cited by 34 publications

(12 citation statements)

References 34 publications

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“…It can be concluded that the nature of the problem comes from the storage material. It is the main reason that promoting stable phase transition is critical for active latent heat storage [37]. The freezing mechanism of paraffin is a complex exothermic process involving slow nucleation that reduces the crystal growth rate.…”

Section: Figure 8 Effective Power During Charging and Dischargingmentioning

confidence: 99%

Thermal Performance Assessment for an Active Latent Heat Storage Tank by Using Various Finned-Coil Heat Exchangers

Ismail¹,

Syahbana²,

Rahman³

2022

IJHT

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Paraffin-based latent heat storage has a higher thermal capacity than sensible heat storage. Despite that, the actual implementation of paraffin as an active latent heat storage (ALHS) system is limited due to low charging and discharging rate with unequal temperature distribution as the impact of mushy region formation. The present study evaluates the finned-coil heat exchanger for the ALHS tank to overcome the related problems. Three finned-coil configurations are tested experimentally: straight-fin, branched-fin and height-fin. The evaluation uses the ALHS arrangement to assess each configuration's charging/discharging rate. The branched fin provides an equal thermal distribution, promoting a higher final temperature of 112.3°C. It also achieves the highest power rate of 250.5 Watts. The height-fin minimizes the effect of void formation, which maintains a sufficient heat transfer rate during the discharging. However, the average power rate for each model is relatively low. The finding indicates that it is essential to provide adequate heat transfer for the center part of the tank, including adding a branched fin along with coil turn to provide a better heat transfer rate. It boosts the charging/discharging rate, making the system's response time desirable to achieve effective power during the operation.

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Section: Figure 8 Effective Power During Charging and Dischargingmentioning

confidence: 99%

Thermal Performance Assessment for an Active Latent Heat Storage Tank by Using Various Finned-Coil Heat Exchangers

Ismail¹,

Syahbana²,

Rahman³

2022

IJHT

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“…The side effect is also observed which alter the phase transition behavior after 100 thermal cycles [20]. It affects the FS-Paraffin in similar manner where the FS-Paraffin experiences the decrement on melting enthalpy and charging/discharging rate after 5,000 cycles due to thermal disruption [21]. Furthermore, the thermal treatment through accelerated aging thermal cycles scenario provides the reasonable limitation for the decrement of performance and storage capacity of paraffin as PCM in latent TES [22].…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the Discharging Rate and State of Health of Paraffin/HDPE after 10,000 Thermal Cycling under Various Charging Speed

Suyitno¹,

Rahmalina²,

Ismail³

et al. 2023

IJHT

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Fast-charging mode thermal energy storage (TES) can be obtained by improving the average heat transfer rate of the system. However, it leads to the risk of performance deterioration for the long-term operation. The impact of charging rate for paraffin and FS-Paraffin (form-stable paraffin) is evaluated in the present work. The heating/cooling process is repeated for 10,000 cycles with different charging rate (1℃/min, 5℃/min and 10℃/min). The performance is focused on the discharging rate and thermal decomposition. It shows that the fast-mode treatment causes a severe deceleration in the discharging speed. The lowest discharging rate of paraffin is obtained at 0.64℃/min. The FS-Paraffin is generally better to withstand from thermal deterioration. It has a suitable discharging rate (0.82℃/min) with the lowest state of health (SoH) percentage of 97.3%. It implies that the presence of polymer additive (20 wt% high-density polyethylene) for FS-Paraffin reduces the impact of fast-charging operation. Further evaluations are discussed in the article, including the impact on SoH, thermal conductivity and storing performance. The overall condition indicates that thermal deterioration likely occurred during the fast-mode operation and requires extensive protection to maintain the long-term operation of the TES material.

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“…An old oil-well is relatively abandoned caused by several factor such as low productivity and high operational cost. However, the old oil-well able to produce significant crude oil which can be refined for particular product like wax, fuel oil and lubricating oil [1]. Hence, the reactivation process of old oil-well gains significant interest nowadays [2,3].…”

Section: Introductionmentioning

confidence: 99%

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

2022

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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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Increasing the rating performance of paraffin up to 5000 cycles for active latent heat storage by adding high-density polyethylene to form shape-stabilized phase change material

Cited by 34 publications

References 34 publications

Thermal Performance Assessment for an Active Latent Heat Storage Tank by Using Various Finned-Coil Heat Exchangers

Thermal Performance Assessment for an Active Latent Heat Storage Tank by Using Various Finned-Coil Heat Exchangers

Evaluation on the Discharging Rate and State of Health of Paraffin/HDPE after 10,000 Thermal Cycling under Various Charging Speed

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

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