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Non-equilibrium theoretical analysis of resorption power generation cycle with multiple expansions

posted on 01.01.2017, 00:00 by H Bao, Z Ma
The performance of the proposed multiple expansion resorption power generation cycle using three typical resorption salt pairs, including sodium bromide - manganese chloride, strontium chloride - manganese chloride and sodium bromide - strontium chloride, have been investigated not just based on theoretical thermodynamics but also with the consideration of practical factors to obtain better understanding and more insights for a real system design. The multiple expansion resorption power generation using sodium bromide - manganese chloride and sodium bromide - strontium chloride pairs can achieve 100~600 kJ/kg (ammonia) work output when heat source temperature is from 30 °C to 150 °C; the multiple expansion using strontium chloride - manganese chloride pair has higher average work output per one expansion stage than that using the other two pairs. The cyclic energy efficiency can be achieved as 0.06~0. 15 when implementing 2~4 expansions in a more practical scenario where the equilibrium pressure drop is set to 2 bar and the heat source temperature is in the range of 80~150 °C. Such efficiencies are circa 27~62% of Carnot efficiency under the same thermal conditions.


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Newcastle University