کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
786667 1466398 2016 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurement of thermodynamic properties of ammoniated salts and thermodynamic simulation of resorption cooling system
ترجمه فارسی عنوان
اندازه گیری خواص ترمودینامیکی نمک های آمونیاک و شبیه سازی ترمودینامیکی سیستم خنک کننده رسپتور
کلمات کلیدی
فشار غلظت ایزوترم، پسماند، آمونیاک، نمکهای فلزی، سیستم خنک کننده جذب کننده پسماند، آمونیاک، نمکهای فلزی، سیستم خنک کننده جذب
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• PCIs of ammonia sorption on NaBr and MnCl2 are measured.
• Significant hysteresis is observed between adsorption and desorption PCIs.
• Thermodynamic properties are evaluated using van't Hoff plots.
• Thermodynamic analysis of resorption cooling system is done using measured properties.

The adsorption and desorption pressure-concentration isotherms (PCIs) of ammonia on NaBr and MnCl2 salts are measured at different temperatures. Significant hysteresis is observed between adsorption and desorption PCIs. From PCI data, van't Hoff plots are constructed to estimate the enthalpies of formation for different ammonia concentrations. Substantial variation in reaction enthalpy during adsorption and desorption is noticed from beginning to the end of the processes. The average values of ΔH for NaBr and MnCl2 are −28.59 kJ mol−1 and −60.17 kJ mol−1 respectively for adsorption and 29.16 kJ mol−1 and 65.62 kJ mol−1 respectively for desorption. The resorption cooling system is thermodynamically analyzed using measured equilibrium data. The coefficient of performance (COP) and specific cooling power (SCP) of resorption system is evaluated to be 0.31 and 52 W kg−1 at refrigeration, regeneration and ambient temperatures of −15 °C, 170 °C and 25 °C respectively at a mass ratio of 4. About 49.18% decrease in COP is noticed in comparison with maximum theoretical COP in which 32.78% and 16.36% reductions are due to hysteresis effect and thermal capacity of metallic mass respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refrigeration - Volume 67, July 2016, Pages 54–68
نویسندگان
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