NANO VE MİKRO TOZ MALZEMELERLE ÜRETİLEN YÜKSEK ISI YALITIM PERFORMANSLI VAKUM YALITIM PANELİ ÇEKİRDEKLERİNİN FİZİKSEL VE MEKANİK ÖZELLİKLERİ

Year 2023, , 1424 - 1438, 30.12.2023

Ali Ekrem Akdağ , Metin Davraz , Kamil Delikanlı

https://doi.org/10.21923/jesd.1240291

Abstract

Vakum Yalıtım Panelleri (VYP), ısı kayıplarının azaltılmasında kullanılan ve geleneksel yalıtım malzemelerine kıyasla çok daha düşük ısı iletkenlik katsayısına sahip yeni nesil yalıtım malzemelerdir. Isı iletkenlik katsayıları ~3-7 mWm-1K-1 aralığında ve kalınlıkları geleneksel yalıtım malzemelerine göre 5-10 kat daha ince olabilmektedir. VYP’lerin, çekirdek malzemesi geçirimsiz bir bariyer içerisinde vakumlanır. Vakum sonrası panel üzerine uygulanan atmosfer basıncı ~10 ton/m2 seviyesindedir. Dolayısıyla çekirdeğin fiziksel ve mekanik özellikleri, boyutsal kararlılık açısından çok önemlidir. Yeterli mekanik özelliklere sahip olmayan çekirdekler vakumlandıktan sonra çöker ve rijit bir panel elde edilemez. Bu çalışmada, fumed silika (FS) ve alternatif tozların karışımı ile üretilen çekirdeklerin mekanik ve fiziksel özelliklerinin belirlenmesi amaçlanmıştır. Bu amaç doğrultusunda, çekirdek üretiminde beş farklı özgül yüzey alanına (ÖYA) sahip nano ve mikro boyutta tozlar kullanılmıştır. Ayrıca karışıma %5, %10 ve %15 oranlarında cam elyafı (fiber) eklenmiştir. Karışım oranları belirlendikten sonra 20-50 kN aralığında sıkıştırma kuvvetleri uygulanarak farklı fiziksel ve mekanik özellikte 45 çekirdek panel üretilmiştir. Çekirdeklerin fiziksel ve mekanik özellikleri DIN EN 1602, DIN EN 826, DIN EN 1607 standartlarına göre test edilmiştir. Elde edilen bulgular değerlendirildiğinde, çekirdek tasarımında ≤%10 fiber ilavesi ve yüksek ÖYA’na sahip tozların çekirdek boyutsal kararlılığını ve elastisite modülünü arttırdığı tespit edilmiştir. Sonuç olarak DIN EN standartlarına göre en uygun mekanik özellikleri CP-1-4 çekirdeği sağlamıştır.

Keywords

Vakum Yalıtım Panelleri, Fiziksel ve Mekanik Özellik, Isı Yalıtımı, Çekirdek.

Supporting Institution

Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK).

Project Number

Proje No: 213M740

Thanks

Bu çalışma Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK) 213M740 No'lu proje kapsamında desteklenmiştir. Yazarlar destekleri için TÜBİTAK'a teşekkür eder.

PHYSICAL AND MECHANICAL PROPERTIES OF VACUUM INSULATION PANEL CORES WITH HIGH THERMAL INSULATION PERFORMANCE PRODUCED WITH NANO AND MICRO POWDER MATERIALS

Abstract

Vacuum Insulation Panels (VIPs) are next-generation insulation materials used to reduce heat loss, characterized by significantly lower thermal conductivity compared to traditional insulation materials. The thermal conductivity of Vacuum Insulation Panels (VIPs) typically ranges between 3-7 mWm-1K-1, and their thickness can be 5-10 times thinner compared to traditional insulation materials. The core material of the VYPs is vacuumed inside an impermeable barrier. After vacuuming, the atmospheric pressure applied to the panel is approximately 10 tons/m2. Therefore, the physical and mechanical properties of the core material are crucial in terms of dimensional stability. Core materials that lack sufficient mechanical properties collapse after vacuuming; thus, it is not possible to achieve a rijit panel. This study aimed to determine the mechanical and physical properties of cores produced by mixing fumed silica (FS) with alternative powders. Five specific surface areas (SSA) nano and micro-sized powders were utilized in core production to achieve this purpose. Additionally, glass fiber was added to the mixture at 5%, 10%, and 15% ratios. After determining the mixture ratios, 45 core panels with varying physical and mechanical properties were produced by applying compression forces in the 20-50 kN range. The physical and mechanical properties of the cores were tested according to DIN EN 1602, DIN EN 826, and DIN EN 1607 standards. Upon evaluating the obtained findings, it was determined that adding ≤10% fiber in core design and using powders with high specific surface area (SSA) increased core dimensional stability and elastic modulus. Consequently, according to DIN EN standards, the CP-1-4 core exhibited the most suitable mechanical properties.

Keywords

Vacuum Insulation Panels, Physical and Mechanical Properties, Thermal insulation, Core.

Project Number

Proje No: 213M740

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