Pengaruh Komposisi Garam Klorida Dan Penambahan Agen Nukleasi Terhadap Derajat Supercooling Larutan Eutektik Garam Klorida/H2O Untuk Cold Storage Berbasis Phase Change Material

Arofi, Anam (2016) Pengaruh Komposisi Garam Klorida Dan Penambahan Agen Nukleasi Terhadap Derajat Supercooling Larutan Eutektik Garam Klorida/H2O Untuk Cold Storage Berbasis Phase Change Material. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Larutan eutektik air dan garam umumnya digunakan sebagai Phase Change Material untuk cold storage. Namun dalam penerapannya, larutan ini memiliki masalah pada ketidaksempurnaan proses pembekuan yang terjadi karena adanya supercooling. Dalam penelitian ini dilakukan pembekuan larutan air dan garam dengan variasi komposisi dan penambahan agen nukleasi. Jenis garam klorida yang digunakan adalah NaCl, MgCl2, dan NH4Cl. Variasi komposisi garam klorida yang digunakan adalah 0 wt%, 2 wt%, 4 wt%, 6 wt% dan 8 wt%. Agen nukleasi yang digunakan adalah boraks dengan variasi penambahan 1 wt%, 2wt% dan 3 wt%. Proses pengujian yang dilakukan adalah chamber test. Dari hasil penelitian terlihat bahwa komposisi garam klorida memberikan pola pengaruh yang berbeda terhadap derajat supercooling dan berkisar pada 0 – 5 oC. Selain itu penambahan 1 wt% agen nukleasi pada NaCl/H2O tercatat memberikan penurunan derajat supercooling sebesar 0,87oC. Namun penambahan agen nukleasi pada MgCl2/H2O dan NH4Cl/H2O tercatat justru memberikan kenaikan derajat supercooling sebesar 1 – 2 oC. ===================================================================================== Eutectic solution of water and salt is generally used as a Phase Change Material for cold storage. But in practice, this solution often has problems with imperfections process of freezing that occurs because of the phenomenon of supercooling. In this research, the process of freezing a solution of water and salt with a variation of the composition and the addition of a nucleating agent were done. The type of chloride salts used are NaCl, MgCl2, and NH4Cl. Variations composition of chloride salts are 0 wt%, 2 wt%, 4 wt%, 6 wt% and 8 wt%. Nucleating agent used is borax with 1 wt%, 2 wt% and 3 wt% in addition. The testing process is chamber test. From the research it appears that the composition of chloride salts provide different patterns to the degree of supercooling in the range 0-5 ° C. Besides that, the addition of 1 wt% nucleating agent in NaCl/H2O gives a reduction in the degree of supercooling in the amount of 0,87oC. But addition to MgCl2/H2O and NH4Cl/H2O gives a rising in the degree of supercooling at 1-2°C.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 621.56 Aro p
Uncontrolled Keywords: Agen Nukleasi; Cold Storage; Derajat Supercooling; Garam Klorida; Phase Change Material; Degree of Supercooling; Nucleating Agent; Salt Chloride
Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Mrs Anis Wulandari
Date Deposited: 03 Jul 2017 04:41
Last Modified: 26 Dec 2018 04:05
URI: http://repository.its.ac.id/id/eprint/41843

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