Multi absorber stand alone liquid desiccant air-conditioning systems for higher performance
Multi absorber stand alone liquid desiccant air-conditioning systems for higher performance
复制标题
DOI：
10.1016/j.solener.2008.11.010
复制
发表时间：
2009-05
期刊：
影响因子：
6.7
通讯作者：
Ritunesh Kumar;P. Dhar;S. Jain;A. K. Asati
中科院分区：
文献类型：
--
作者：
Ritunesh Kumar;P. Dhar;S. Jain;A. K. Asati
利用可再生能源或废热实现舒适的环境而不对地球大气产生有害影响是空调领域的主要挑战。液体除湿技术是一种很有前途的选择。在过去的几十年里，全世界都在研究如何将这种系统商业化。混合式液体除湿系统（V-C和液体除湿系统的组合）由于其COP高、再生温度低而受到越来越多的关注。本文对独立式溶液除湿系统的稳态性能进行了模拟和分析。降膜设计的吸收器和再生器已被选定为研究，由于其较低的压力降。通过求解基本的质量和能量平衡方程，对这些部件进行了模拟。这是一个非线性耦合的一阶微分方程组，用四阶有限差分龙格-库塔法求解。整个系统已被模拟使用华纳的技术。提出了两种新的独立的液体除湿循环，通过多个吸收器充分利用除湿剂的潜力。所提出的新循环显著提高了独立系统的COP。一个参数的研究也进行了这些液体除湿循环，以确定影响系统性能的关键设计参数。
Achieving comfortable environment with the use of renewable energy or waste heat without creating the hazardous effects over the earth atmosphere are major challenges in the field of air-conditioning. Liquid desiccant technology is a promising option. For the past few decades research is going on worldwide to commercialize such systems. Hybrid liquid desiccant systems (combination of vapor compression (V-C) and liquid desiccant system) have got more attention probably due to higher COPs and lower regeneration temperature for such systems. In the present communication the steady-state performance of stand alone liquid desiccant systems has been simulated and analyzed. Falling film designs of absorber and regenerator have been selected for the study due to their lower pressure drops. The simulation of these components has been carried out by solving the basic mass and energy balance equations. These are nonlinear coupled first order differential equations, which have been solved by using fourth order finite difference Runge–Kutta method. The overall system has been simulated using Warner’s technique. Two new stand alone liquid desiccant cycles utilizing the potential of desiccant fully through multiple absorbers have been proposed. The proposed new cycles improve the COP of stand alone systems significantly. A parametric study has also been carried out on these liquid desiccant cycles to identify the key design parameters affecting the performance of the system.