کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5451388 1513079 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experimental investigations on heat content of supercooled sodium acetate trihydrate by a simple heat loss method
ترجمه فارسی عنوان
تحقیقات تجربی در مورد مقدار گرمای تری هیدرات استات سدیم سوپاپاید شده با استفاده از روش تلفات حرارتی ساده
کلمات کلیدی
سدیم استات تری هیدرات، خنک نگه داشتن، اندازه گیری مقدار حرارت، جداسازی فاز، مواد تغییر فاز
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی


- A simple heat loss method was used to measure heat content of PCM samples.
- The measured heat content is close to that in real application.
- New additives were investigated aiming to obtain high heat contents of PCM samples.
- Typically 30% higher heat content can be obtained by PCM with selected additives.

Sodium acetate trihydrate is a phase change material that can be used for long term heat storage in solar heating systems because of its relatively high heat of fusion, a melting temperature of 58 °C and its ability to supercool stable. In practical applications sodium acetate trihydrate tend to suffer from phase separation which is the phenomenon where anhydrous salt settles to the bottom over time. This happens especially in supercooled state. The heat released from the crystallization of supercooled sodium acetate trihydrate with phase separation will be lower than the heat released from sodium acetate trihydrate without phase separation. Possible ways of avoiding or reducing the problem of phase separation were investigated. A wide variety of composites of sodium acetate trihydrate with additives including extra water, thickening agents, solid and liquid polymers have been experimentally investigated by a simple heat loss method. The aim was to find compositions of maximum heat released from the crystallization of supercooled sodium acetate trihydrate samples at ambient temperature. It was found that samples of sodium acetate trihydrate with 0.5-2% (wt.%) Carboxy-Methyl Cellulose, 0.3-0.5 % (wt.%) Xanthan Gum or 1-2% (wt.%) of some solid or liquid polymers as additives had significantly higher heat contents compared to samples of sodium acetate trihydrate suffering from phase separation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 139, 1 December 2016, Pages 249-257
نویسندگان
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