Performance analysis on direct contact condensation refrigeration cycle of high temperature gas with super-cooled liquid

doi:10.11949/j.issn.0438-1157.20170122

Abstract

Abstract:

The direct contact condensation refrigeration cycle of high temperature gas discharged by compressor with super-cooled liquid is designed. Combined with the thermodynamic properties of natural refrigerant ammonia, the thermal performances of direct contact condensation refrigeration cycle are analyzed and compared with that of convention two stage compression refrigeration cycle and one stage compression refrigeration cycle. The following conclusions are obtained. With the increasing of saturated liquid temperature of main cycle, the coefficient of performance (COP) of direct contact condensation refrigeration cycle first increases, then decreases and has the maximum, the condenser heat load first decreases, then increases and has the minimum. The refrigerant mass flow rate in evaporator is gradually increasing. At the same evaporating and condensation temperature, when the super cooling degree of supercooled liquid is 20℃, compared with that of conventional two stage compression refrigeration cycle, the COP of direct contact condensation refrigeration cycle increases 4.92%, the condenser heat load reduces 6.65%, and the refrigerant mass flow rate in evaporator reduces 7.2%-7.9%. As well as when the super cooling degree of supercooled liquid is 5℃, compared with that of conventional one stage compression refrigeration cycle, the COP of direct contact condensation refrigeration cycle increases 6.52%, the condenser heat load reduces 3.32%, and refrigerant mass flow rate in the evaporator reduces 8.58%-8.91%. The results show that the ammonia direct contact condensation refrigeration cycle has obvious advantages over the conventional refrigeration cycle.

Key words: high temperature gas, super-cooled liquid, direct contact condensation, refrigeration cycle, thermal performance

摘要：

提出制冷压缩机排出的高温高压制冷剂气体与制冷剂过冷液体直接接触凝结换热的新型制冷循环，结合自然工质氨的热力特性，分析直接接触凝结制冷循环的热力性能，并与常规双级压缩和单级压缩制冷循环的性能进行对比，得出：随着主循环饱和液温度的升高，直接接触凝结制冷循环的性能系数先增大后减小存在最大值，冷凝器散热量先减小后增大存在最小值，流过蒸发器的制冷剂质量流量逐渐增大。在相同蒸发温度和冷凝温度下，当过冷液体的过冷度为20℃时，较常规双级压缩制冷循环，直接接触凝结制冷循环的性能系数提高4.92%，冷凝器散热量减少6.65%，蒸发器的制冷剂质量流量减少7.2%～7.9%；当过冷液体的过冷度为5℃时，较常规单级压缩制冷循环，直接接触凝结制冷循环的性能系数提高6.52%，冷凝器散热量减少3.32%，蒸发器的制冷剂质量流量减少8.58%～8.91%。结果表明氨直接接触凝结制冷循环较常规制冷循环具有明显的优势。

关键词: 高温气体, 过冷液体, 直接接触凝结, 制冷循环, 热力性能

CLC Number:

TB61⁺1

NING Jinghong, LIU Shengchun. Performance analysis on direct contact condensation refrigeration cycle of high temperature gas with super-cooled liquid[J]. CIESC Journal, 2018, 69(4): 1437-1444.

宁静红, 刘圣春. 高温气体与过冷液直接接触凝结制冷循环的性能分析[J]. 化工学报, 2018, 69(4): 1437-1444.

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