NGHIÊN CỨU HIỆU NĂNG NHIỆT CỦA CÁC HẠT ZEOLITE ỨNG DỤNG LÀM CHẤT CÁCH NHIỆT

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Tác giả: Minh Tâm Lê, NguyễnVăn Quý

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.277 - 287

Bộ sưu tập: Báo, Tạp chí

ID: 462604

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Nghiên cứu này trình bày kết quả về hiệu năng của hai loại zeolite trong việc hấp thụ và giải phóng nhiệt, được nghiên cứu dưới nhiều chu trình làm nóng và làm lạnh. Trọng tâm của nghiên cứu nhằm nhấn mạnh ảnh hưởng của sự khác biệt về cấu trúc zeolite so với kaolin. Kaolin là một khoáng vật tự nhiên dẫn nhiệt theo cơ chế của vật liệu rắn điển hình và nhanh chóng cân bằng với nhiệt độ của môi trường xung quanh. Ngược lại, tính chất xốp của zeolite hoạt động như các khoang chứa khí, tạo nên một vùng đệm nhiệt dẫn đến sự chênh lệch nhiệt độ với môi trường. Ở trạng thái cân bằng tại 70 °C, zeolite Y thể hiện một vùng đệm nhiệt là 3,5 °C, trong khi zeolite 4A cho thấy một sự khác biệt nhỏ hơn là 2,2 °C. Những kết quả này tương thích với nghiên cứu về tính chất xốp của zeolite, cụ thể là thể tích xốp của zeolite Y (3,59 ´ 10–2 cm3 g–1) và zeolite 4A (1,85 ´ 10–2 cm3 g–1). Ngoài ra, hệ số dẫn nhiệt và nhiệt dung riêng của các vật liệu này đã được xác định và cho kết quả phù hợp với hành vi nhiệt của chúng. Do đó, khả năng áp dụng của các zeolite này làm lớp cách nhiệt bên ngoài có thể đạt được khi bề dày của chúng được tối ưu hóa.This study presents the results of the thermal performance of two different zeolites in heat absorption and heat release investigated under multiple heating-cooling cycles. The specific focus is highlighting the influence of zeolitic structure in comparison to the raw kaolin as their precursor to evaluate the role of porous materials. Kaolin is a naturally occurring mineral lacking a porous structure, which conducts heat through typical solid material mechanisms and quickly equilibrates with the temperature of the surroundings. In contrast, the porous nature of zeolite creates abundant air-filled cavities, which establish a thermal buffer zone leading to temperature discrepancies with the environment. At the equilibrium state at 70 oC, zeolite Y exhibits a temperature buffer of 3.5 °C, while zeolite 4A demonstrates a smaller difference of 2.2 °C. These findings are consistent with the research on porous volumes of the synthesized zeolite Y (3.59 ´ 10–2 cm3 g–1) and zeolite 4A (1.85 ´ 10–2 cm3 g–1). In the estimation section, heat conductivity coefficients and specific heat capacities of these materials were determined which resulted in good agreements with heat behavior of these zeolitic materials. Consequently, the applicability of these zeolites as external insulators can be expected if the thickness of the material layers is optimized according to the intended temperature range.

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