Termodinamička simulacija sistema sorpcionog hlađenja baziranog na adsorbentu CO2

Shajiullah Syed,Vinod Sharma

doi:10.5937/fmet2001187s

Abstract

Different materials like activated carbon, metal organic frameworks, silica, etc. have ability to adsorb (exothermic process) and desorb (endothermic process) CO2. These heat interactions during adsorption and desorption processes can be utilized for the development of gas - adsorbent based sorption refrigeration system. Therefore, in the present work, this concept is employed to analyze the thermodynamic performance of CO2 - adsorbent based sorption refrigeration system (CO2-A SRS). The chosen adsorbents for thermodynamic simulation are Activated Carbon (Norit RB3), Pore Expanded Mesoporous Silica Materials (PE MSM 41), Amine Tethered Mesoporous Silica Materials (AT MSM 41) and Amine Functionalized Silica (AF Silica). The working pairs are developed based on the available pressure difference between coupled adsorbent to allow sufficient amount of CO2 to flow between the coupled materials in the operating temperature range of 0°C (refrigeration output), 25°C (ambient) and 100°C (heat source). The thermodynamic performance of refrigeration system is compared for two adsorbent pairs. The thermodynamic performance includes refrigeration effect, specific refrigeration power, coefficient of performance, refrigeration capacity and second law of efficiency. The refrigeration effect of Activated Carbon - PE MSM 41 pair is observed double that of AT MCM 41 - AF Silica pair. In addition, the thermodynamic performance of CO2-A SRS is compared with the performance of CO2 - adsorbent based vapour adsorption refrigeration system (CO2-A VARS) available in literature. The COP of CO2-A SRS is observed higher than CO2-A VARS.

Highlights

Carbon dioxide has adverse effect on the environment, since Green House Gases contains 77% of CO2 [1]
In the present study, Activated Carbon and AT MSM 41 are considered as high-pressure type, and PE MSM 41 and AF Silica as low-pressure type adsorbent
The study on thermodynamic simulation of CO2 – adsorbent based sorption refrigeration system and vapour adsorption system led to the following conclusions:

Summary

INTRODUCTION

Carbon dioxide has adverse effect on the environment, since Green House Gases contains 77% of CO2 [1]. In addition to high adsorption capacity and fast kinetics, activated carbon exhibits high surface area, better pore size distribution and thermal stability It is more suitable for adsorption of CO2 compared to other solid adsorbents [3,4,5,6, 26]. Activate carbons are used to study the thermodynamic performance of CO2 – adsorbent based vapour adsorption refrigeration systems (CO2-A VARS) by several researchers. The refrigeration effect in CO2-A SRS can be obtained by utilizing the heat interactions involved during CO2 transfer between coupled adsorbent materials This type of gas – solid sorption refrigeration system is never studied in literature using CO2 as working fluid. The performance of CO2-A SRS is estimated in terms of refrigeration effect, refrigeration capacity, specific refrigeration power, COP and cycle efficiency

WORKING PRINCIPLE OF CO2 – ADSORBENT BASED REFRIGERATION SYSTEMS

SELECTION OF ADSORBENT PAIRS

Results and discussion

Thermodynamic analysis of CO2 adsorption based sorption refrigeration system

CONCLUSIONS

A VARS adsorbent based vapour adsorption refrigeration system