Performance And Optimization Of Steam Operated Double Effect Water-Lithium Bromide Absorption Heat Pump

Water-lithium bromide absorption heat pump technology has a large potential for waste heat recovery, improving energy efficiency and reducing greenhouse gas emissions. As cooling and heating plant, both ozone-depleting potential (ODP) and global warming potential (GWP) of absorption heat pump are zero, and it can not only balance electric load in summer, but also recoer waste heat in winter. So absorption heat pump technology plays an invaluable role in waste heat recovery, optimization energy structure and sustainable development. For this, performance and optimization of steam operated double effect Water-lithium bromide absorption heat pump are studied in this thesis.Firstly, according to thermodynamic and heat transfer analysis of eight main heat exchangers of absorption heat pump, coupled simulation models of steam operated double effect lithium bromide absorption heat pump were built at cooling nominal condition, cooling part load condition, heating nominal condition and heating part load condition. Due to their complexity and mutual restraint between lithium bromide solution temperature and concentration range, they were sloved using the subspace trust region method based on Newton.Secondly, due to validate the simulation models a steam operated double effect water-lithium bromide absorption heat pump was designed and a test rig was established to measure the performances of absorption heat pump and the thermodynamic paramenters of its main solution state points. And the accuracy of the predictions was confirmed by the good agreement with experimental data. Thirdly, the performances of double effect water-lithium bromide absorption heat pump were evalutated at the cooling part load, heating nominal and heating part load conditions in four different operational modes. The results show that its part load performance is the best when chilled (hot) water inlet temperature keeps constant and the adjustment method of combine solution circulation rate with steam rate was used. The highest cooling coefficient of performance is 1.7 and the highest heating coefficient of performance gets to 2.77.Fourthly, steam operated double effect water-lithium bromide absorption heat pump system is evaluated to identify the effects of heat transfer temperature differences of eight main heat exchangers at design conditions on its total heat transfer area and its performances. Based on the evaluation results, thermoeconomic optimization analysis was present to optimize the absorption heat pump, aimed at minimizing its life cycle costs (LCC) and equivalent uniform annual costs (EUAC).Finally, due to the waste heat resources and cooling/heating demand in thermal power plant, two different mode of steam operated double effect water-lithium bromide absorption heat pump for waste heat recovery were introduced.And steam operated double effect water-lithium bromide absorption heat pump as air conditioning cooling and heating plant was analyzed in an auxiliary building of thermal power plant in Tianjin. The results reveal that absorption heat pump as heating and cooling plant is with economic and environmental benefits, and it can be a good example in thermal power plants.