Analysis of an optimal resorption cogeneration using mass and heat recovery processes

This paper presents an optimised resorption cogeneration using mass and heat recovery to improve the performance of a novel resorption cogeneration fist proposed by Wang et al. This system combines ammonia-resorption technology and expansion machine into one loop, which is able to generate refrigeration and electricity from low-grade heat sources such as solar energy and industrial waste heat. Two sets of resorption cycle are designed to overcome the intermittent performance of the chemisorption and produce continuous/simultaneous refrigeration and electricity. In this paper, twelve resorption working pairs of salt complex candidates are analysed by the first law analysis using Engineering Equation Solver (EES). The optimal resorption working pairs from the twelve candidates under the driven temperature from 100°C to 300°C are identified. By applying heat/mass recovery, the coefficient of performance (COP) improvement is increased by 38% when the high temperature salt (HTS) is NiCl2 and by 35% when the HTS is MnCl2. On the other hand, the energy efficiency of electricity has also been improved from 8% to 12% with the help of heat/mass recovery. The second law analysis has also been applied to investigate the exergy utilisation and identify the key components/processes. The highest second law efficiency is achieved as high as 41% by the resorption working pair BaCl2–MnCl2 under the heat source temperature at 110°C.

[1]  Gunnar Tamm,et al.  Theoretical and experimental investigation of an ammonia–water power and refrigeration thermodynamic cycle , 2004 .

[2]  Electo Eduardo Silva Lora,et al.  Exergetic and economic comparison of ORC and Kalina cycle for low temperature enhanced geothermal system in Brazil , 2013 .

[3]  William D'haeseleer,et al.  Comparison of Thermodynamic Cycles for Power Production from Low-Temperature Geothermal Heat Sources , 2013 .

[4]  Costante Mario Invernizzi,et al.  Heat recovery from Diesel engines: A thermodynamic comparison between Kalina and ORC cycles , 2010 .

[5]  Ruzhu Wang,et al.  Working pairs for resorption refrigerator , 2011 .

[6]  D. Y. Goswami,et al.  Optimum operating conditions for a combined power and cooling thermodynamic cycle , 2007 .

[7]  B. Spinner,et al.  Ammonia-based thermochemical transformers , 1993 .

[8]  Ruzhu Wang,et al.  Experimental study of mass recovery adsorption cycles for ice making at low generation temperature , 2006 .

[9]  Takao Kashiwagi,et al.  Mass recovery adsorption refrigeration cycle—improving cooling capacity , 2004 .

[10]  A. Hasan,et al.  First and second law analysis of a new power and refrigeration thermodynamic cycle using a solar heat source , 2002 .

[11]  Per Lundqvist,et al.  Comparison and analysis of performance using Low Temperature Power Cycles , 2013 .

[12]  Takao Kashiwagi,et al.  Experimental investigation of mass recovery adsorption refrigeration cycle , 2005 .

[13]  Ruzhu Wang,et al.  Experimental study and comparison of thermochemical resorption refrigeration cycle and adsorption refrigeration cycle , 2010 .

[14]  A. I. Kalina,et al.  Combined Cycle and Waste Heat Recovery Power Systems Based on a Novel Thermodynamic Energy Cycle Utilizing Low-Temperature Heat for Power Generation , 1983 .

[15]  Anthony Paul Roskilly,et al.  A resorption cycle for the cogeneration of electricity and refrigeration , 2013 .

[16]  Ruzhu Wang,et al.  A comparison of the performances of adsorption and resorption refrigeration systems powered by the low grade heat , 2009 .

[17]  Ruzhu Wang,et al.  Comparison of the adsorption performance of compound adsorbent in a refrigeration cycle with and without mass recovery , 2006 .

[18]  M. He,et al.  A review of research on the Kalina cycle , 2012 .

[19]  Ruzhu Wang,et al.  A Review of Reactant Salts for Resorption Refrigeration Systems , 2010 .

[20]  Ruzhu Wang,et al.  Performance improvement of adsorption cooling by heat and mass recovery operation , 2001 .