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A thermodynamic platform for evaluating the energy efficiency of combined power generation and desalination plants
npj Clean Water ( IF 11.4 ) Pub Date : 2021-04-08 , DOI: 10.1038/s41545-021-00114-5
Kim Choon Ng , Muhammad Burhan , Qian Chen , Doskhan Ybyraiymkul , Faheem Hassan Akhtar , M. Kumja , Robert W. Field , Muhammad Wakil Shahzad

In seawater desalination, the energy efficiency of practical processes is expressed in kWh_electricity or low-grade-heat per m3 of water produced, omitting the embedded energy quality underlying their generation processes. To avoid thermodynamic misconceptions, it is important to recognize both quality and quantity of energy consumed. An unmerited quantitative apportionment can result in inferior deployment of desalination methods. This article clarifies misapprehensions regarding seeming parity between electricity and thermal sources that are sequentially cogenerated in power plants. These processes are represented by heat engines to yield the respective maximum (Carnot) work potentials. Equivalent work from these engines are normalized individually to give a corresponding standard primary energy (QSPE), defined via a common energy platform between the adiabatic flame temperature of fuel and the surroundings. Using the QSPE platform, the energy efficiency of 60 desalination plants of assorted types, available from literature, are compared retrospectively and with respect to Thermodynamic Limit.



中文翻译:

一个热力平台,用于评估联合发电和海水淡化厂的能源效率

在海水淡化中,实际过程的能源效率以kWh电或每m 3所生产的水的低品位热量表示,而忽略了其生产过程背后的内在能源质量。为了避免热力学上的误解,重要的是要认识到所消耗能量的质量和数量。定量分配不当可能会导致脱盐方法的部署不佳。本文澄清了对在电厂中依次热电联产的电力和热源之间看似均等的误解。这些过程以热机为代表,以产生各自的最大(卡诺)工作电位。这些引擎的等效功分别进行归一化,以给出相应的标准一次能源(Q SPE),通过燃料绝热火焰温度与周围环境之间的公共能量平台定义。使用Q SPE平台,对60种不同类型的海水淡化厂(可从文献中获得)的能效进行回顾性分析,并与热力学极限进行了比较。

更新日期:2021-04-09
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