Thermodynamic analysis of simplified dual-pressure ammonia-water absorption power cycle |
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Authors: | Jun-ye Hua Ya-ping Chen Hua-jin Liu and Jia-feng Wu |
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Affiliation: | Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China |
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Abstract: | A simplified dual-pressure ammonia-water absorption power cycle (DPAPC-a) using low grade energy resources is presented and
analyzed. This cycle uses turbine exhaust heat to distill the basic solution for desorption. The structure of the cycle is
simple which comprises evaporator, turbine, regenerator (desorber), absorber, pump and throttle valves for both diluted solution
and vapor. And it is of high efficiency, because the working medium has large temperature difference in evaporation and small
temperature difference in absorptive condensation, which can match the sensible exothermal heat resource and the cooling water
simultaneously. Orthogonal calculation was made to investigate the influence of the working concentration, the basic concentration
and the circulation multiple on the cycle performance, with 85–110 °C heat resource and 20–32°C cooling water. An optimum
scheme was given in the condition of 110 °C sensitive heat resource and 20 °C cooling water, with the working concentration
of 0.6, basic concentration of 0.385, and circulation multiple of 5. The thermal efficiency and the power recovery efficiency
are 8.06 % and 6.66%, respectively. The power recovery efficiency of the DPAPC-a is 28.8% higher than that of the steam Rankine
cycle (SRC) and 12.7% higher than that of ORC (R134a) under the optimized situation. |
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Keywords: | absorption power cycle ammonia-water circulation multiple ammonia concentration Kalina cycle |
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