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Analysis of a spray flash desalination system driven by low-grade waste heat with different intermittencies

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  • Cai, Benan
  • Long, Chengjun
  • Du, Qiaochen
  • Zhang, Wenchao
  • Hou, Yandong
  • Wang, Haijun
  • Cai, Weihua

Abstract

Making full use of low-grade waste heat is of great significance in desalination technology. A spray flash desalination system driven by low-grade waste heat is established in this paper. The complex intermittency is taken into account in the current modeling analysis. The transient feed tank temperature, long-term system capacity, total production and energy performance of the system are investigated for various intermittencies. The results reveal that the maximum feed tank temperature presents a non-monotonic variation and reaches a stable value of 342.8 K when the rate of heat storage reaches 0. The transient production rate profiles display a jump at the intersection between the period when the waste heat source is on and off. The total production increases by 150.1% as the intermittency decreases from 80% to 20% at t = 1200min. The feed water flow rate has a non-monotonic effect on the total production for 75% intermittency. The specific thermal energy consumption (STEC) rises from 278.63 to 1023.51 kJ/kg as the feed water flow rate increases from 2 to 10 L/min at t = 60min. STEC is more affected by the feed water flow rate compared with other parameters.

Suggested Citation

  • Cai, Benan & Long, Chengjun & Du, Qiaochen & Zhang, Wenchao & Hou, Yandong & Wang, Haijun & Cai, Weihua, 2023. "Analysis of a spray flash desalination system driven by low-grade waste heat with different intermittencies," Energy, Elsevier, vol. 277(C).
    • Handle: RePEc:eee:energy:v:277:y:2023:i:c:s0360544223010630
    DOI: 10.1016/j.energy.2023.127669
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