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Numerical simulation of liquid desiccant evaporator driven by heat pump

Journal of Central South University 2019年第8期26卷 2197-2213页

作者： NIU Run-ping CHEN Xiao-yi WANG Zi-ye KUANG Da-qing School of Environment and Energy Engineering Beijing University of Civil Engineering and Architecture

The standard k-ε turbulence model and discrete phase model (DPM) were used to simulate the heat and mass transfer in a liquid-desiccant evaporator driven by a heat pump using FLUENT software, and the temperature field and velocity field in the device were obtained. The performance of the liquid-desiccant evaporator was studied as the concentration of the inlet solution varied between 21% and 30% and the pipe wall temperature between 30 and 50 ℃. Results show that the humidification rate and the humidification efficiency increased with the inlet air temperature, the solution flow rate, the solution temperature, and the pipe wall temperature. The humidification rate and humidification efficiency decreased with increasing moisture content in inlet air and the concentration of inlet solution. The humidification rate increased substantially but the humidification efficiency decreased as the inlet air flow rate increased. The error between the simulations and experimental results is acceptable, meaning that our model can provide a theoretical basis for optimizing the performance of a humidifying evaporator.

关键词： heat pump condensation heat discrete phase model (DPM) liquid desiccant evaporator numerical simulation

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

Energy and Built Environment

引用

Energy and Built Environment 2023年第4期4卷 399-407页

作者： Ying Ji Jinyuan Yong Wei Liu Xuejun Zhang Long Jiang Institute of Refrigeration and Cryogenics.Zhejiang University Hangzhou 310027China

Direct air capture(DAC)is one of the most potential technologies to mitigate CO_(2) *** technol-ogy is recognized as a promising CO_(2) capture method in view of its desirable characteristics including reusability of adsorbents and low capital *** 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 *** performance of a 4-step temperature swing adsorption process(TSA)is analyzed at various adsorption/desorption temperatures by using different *** on Coefficient of Performance(COP)of VCR cycle is also conducted in search for a balance between adsorbent and *** 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 *** 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°*** 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

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