Performance study of lithium nitrate-ammonia absorption ice making system for fishing vessels

XU Shangxin, GAO Hongtao

doi:10.16411/j.cnki.issn1006-7736.2025.02.007

Journal of Dalian Maritime University >

2025 , Vol. 51 >Issue 2: 58 - 65

DOI: https://doi.org/10.16411/j.cnki.issn1006-7736.2025.02.007

Performance study of lithium nitrate-ammonia absorption ice making system for fishing vessels

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(Institute of Refrigeration and Cryogenic Engineering, Dalian Maritime University, Dalian 116026, China)

Online published: 2025-03-24

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Abstract

To improve the utilization efficiency of waste heat from fishing boat diesel engines, the ice-making performance of a lithium nitrate-ammonia absorption refrigeration system driven by the cooling water of the fishing boat's cylinder liner was studied. Through thermodynamic model simulation, the effects of factors such as generation temperature, evaporation temperature, and condensation temperature on system performance were analyzed. The research indicates that the lithium nitrate-ammonia absorption refrigeration system can operate stably within the generation temperature range of 75°C to 85°C, with the Coefficient of Performance (COP) reaching up to approximately 0.5. When the generation temperature is higher, the system can maintain a higher COP over a wider evaporation temperature range, demonstrating strong adaptability and reliability. In addition, the calculation results of the energy efficiency coefficient (ECOP) show that high-temperature heat sources can more effectively drive the system to achieve low evaporation temperatures, while an increase in condensation temperature significantly reduces the ECOP. Overall, the lithium nitrate-ammonia absorption refrigeration system is suitable for the ice-making needs of fishing boats during offshore operations, efficiently utilizing the waste heat from the fishing boat for refrigeration, and offering good energy utilization potential as well as energy-saving and emission-reducing effects.

Key words： absorption refrigeration; lithium nitrate - ammonia; fishing vessel waste heat; Coefficient of Performance(COP)

Cite this article

XU Shangxin, GAO Hongtao . Performance study of lithium nitrate-ammonia absorption ice making system for fishing vessels[J]. Journal of Dalian Maritime University, 2025 , 51(2) : 58 -65 . DOI: 10.16411/j.cnki.issn1006-7736.2025.02.007

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