Thermodynamic analysis on direct air capture for building air condition system:Balance between adsorbent and refrigerant  

作　　者：Ying Ji Jinyuan Yong Wei Liu Xuejun Zhang Long Jiang 

机构地区：[1]Institute of Refrigeration and Cryogenics.Zhejiang University,Hangzhou 310027,China

出　　处：《Energy and Built Environment》2023年第4期399-407,共9页能源与人工环境（英文）

基　　金：This research was supported by National Natural Science Foundation of China under contract number(51976178).

摘　　要：Direct air capture(DAC)is one of the most potential technologies to mitigate CO_(2) emission.Adsorption technol-ogy is recognized as a promising CO_(2) capture method in view of its desirable characteristics including reusability of adsorbents and low capital investment.To further improve thermal performance,evaporation/condensation heat of vapor compression refrigeration(VCR)cycle in air condition system of buildings is adopted for adsorp-tion/desorption process of DAC.Thermal performance of a 4-step temperature swing adsorption process(TSA)is analyzed at various adsorption/desorption temperatures by using different adsorbents.Analysis on Coefficient of Performance(COP)of VCR cycle is also conducted in search for a balance between adsorbent and refrigerant.Taking both real working capacity and COP into consideration,Mg-MOF-74&R134a is the best choice for more amounts of CO_(2).Real working capacity of Mg-MOF-74 is up to 0.38 mol•kg−1 at 70°C,which is twice as much as that of zeolite 13X.While zeolite 13X&R134a shows the best performance of two cycles in view of exergy efficiency and COP,which could reach 81.9%and 7.21,respectively,at 35°C.These matches will provide some guidelines for the practical application of the combination of DAC with heating,ventilation and air conditioning(HVAC).

关 键 词：Direct air capture Temperature swing adsorption Refrigeration cycle Condensation heat 

分 类 号：TU834.9[建筑科学—供热、供燃气、通风及空调工程]