Due to slow freezing, freezing fresh fish in a chest freezer often leads to deterioration while products are thawed. Many approaches have been conducted to deal with it. One of them is the application of Phase Change Material (PCM) in refrigeration systems. This study aims to investigate the ability of PCM to accelerate the freezing of fish in the household freezers. The tuna used was stored in the freezer with PCM, which was put on a surface wall cabinet then compared with storage in the freezer without PCM. Besides, the door of the freezer was also opened frequently (three times a day, 1 hr each time) to find out the effect of fluctuating temperatures and freezing operations for 60 hr. The parameters observed include the evolution temperature of the air cabinet and fish, energy consumption of the freezer, and thawing loss. Results showed that PCM accelerated the cooling rate of air cabinets and fish but could not suppress the fluctuation temperature. The quality of the frozen tuna improved, which was indicated by a decreased thawing loss parameter from 3.10% to 1.76%. Overall, this finding revealed PCM has significant potential to improve the fish freezing process. Practical Applications The household chest freezer is widely used to freeze fish by small and medium‐sized enterprises (SMEs). The most important factors in freezer preferences are simple operations and low energy consumption. But, the freezer worked at slow freezing, which caused higher thawing losses of the product. Hence, the application of PCM to the household freezer potentially improves the freezing process of the fish. So, sellers and retailers of fish could maintain their products without replacing the freezer with an advanced one.
Energy demand for paddle wheel aerator in a shrimp pond is high and brings to second highest cost of operational behind feed supply. Most of wheel aerators are driven by electric motors than diesel engines as their easy operations. The electric motors need high electrical energy to drive wheel aerators along day and night. The common type of motor used is Alternating Current (AC) or induction motor, however Brushless Direct Current (BLDC) motor has potential electrical energy saving which need to be explored. This study objectives to find out performance of BLDC and AC motor as paddle wheel aerator driver. The motor’s performances were compared in term of operation of paddle wheel at various static loads. Both motor also challenged by On/Off running every 5 minutes, the treatment goal was to determine their reliability. Parameters observed included consumption of power, wheel rotary, torque, and efficiency, motor temperature as well. Results showed energy consumption of BLDC motor 51% lower than AC motor, and BLDC motor attained 89.99% of maximum efficiency while AC motor efficiency had 73.16%, however rotary wheel and torque both of them were similar. The On/Off treatment caused rising temperature of AC motor but did not affect the temperature of BLDC motor. Therefore, applied BLDC motor as paddle wheel aerator driver could be alternative way to reduce energy consumption without reducing its performance.
Alat transportasi ikan segar (ALTIS) adalah sarana pendingin yang dapat mempertahankan mutu ikan segar. ALTIS umumnya digunakan oleh pedagang kelliling dalam transportasi dan distribusi produknya. Komponen yang menentukan kinerja pendingin adalah heatsink dan dudukan peltier. Kedua bagian ini berfungsi dalam transfer panas kotak penyimpanan ikan menuju udara. Namun, biaya produksi dan harga material kedua komponen tersebut cukup tinggi. Penelitian ini bertujuan untuk modifikasi spesifikasi heatsink dan dudukan peltier, agar mendapatkan efisiensi biaya pembuatannya. Heatsink dibuat dari 3 mm plat tembaga dengan 18 sirip aluminium yang memiliki ketinggian 10 mm dan ketebalan 1 mm. Sementara itu, dudukan peltier juga dibuat dari alumunium dengan ketebalan bervariasi (4, 5, 6, dan 10 mm). Performa kedua bagian ini diuji dengan variabel suhu heatsink dalam, heatsink luar, dan ruang penyimpanan ikan, setiap 5 menit selama 95 menit. Hasil pengujian menunjukkan bahwa suhu ruang penyimpanan ikan menggunakan heatsink baru (17,8°C) lebih rendah dari heatsink sebelumnya (18,3°C). Desain heatsink yang baru ini dapat mengurangi biaya pembuatan sebesar Rp. 807.000,00. Dudukan elemen peltier dengan alumunium setebal 4 mm dapat mempercepat proses perpindahan panas dari ruang penyimpanan ikan menuju peltier. Modifikasi ini dapat diaplikasikan untuk menurunkan biaya dan meningkatkan performa ALTIS.ABSTRACTRefrigerated Fresh Fish Container (ALTIS) is a cooler equipment to maintain the quality of fresh fish. ALTIS is usually used by the itinerant fish traders to preserve their products in transportation and distribution. The components that determine the cooler performance are the heatsinks and the Peltier base plate. These components are responsible for transferring the heat from the fish container to the air. However, the production costs and material price for both components are expensive. This study aimed to reduce production costs by modifying the heatsink and Peltier base plate design specifications. The heatsink was made from 3 mm thickness copper and aluminum fins. The aluminum fins were 18 pieces in total, with 1.6 mm thickness and 10 mm height. Meanwhile, the Peltier base plate was also made from aluminum with varied thicknesses (4, 5, 6, and 10 mm). The performance of both parts was evaluated by temperature measurement in the inner heatsink, outer heatsink, and box container for every 5 minutes in 95 minutes. The results showed that the refrigerated container box temperature with the new heatsink (17.8°C) was lower than the existing heatsink (18.3°C). Moreover, the new heatsink design may reduce the production costs by Rp. 807,000.00. Furthermore, the Peltier base plate with a 4 mm thickness could accelerate the heat-dissipating of Peltier. Thus, the modification can be applied for ALTIS production with lower cost and better performance.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.