在实际行驶工况下两级吸收/压缩混合制冷循环——实用价值分析

Double-Stage System of Absorption-Compression Hybrid Refrigeration Cycle in Real Driving Conditions ——Analysis of Practical Value

摘要: 对前人的单级吸收/压缩混合制冷循环进行改进与优化，提出两级吸收/压缩混合制冷循环系统，高低压发生器以倒串联方式排列。利用发动机废热(废气与冷却液)驱动吸收制冷子循环。进行设计工况(空气温度35℃，冷凝温度55℃，制冷剂蒸发温度3℃，制冷负荷30 kW)以R124-DMAC工质对为制冷剂的热力循环计算。当车速 ≥ 23 KM/H时吸收子循环开始提供制冷量，当车速 ≥ 85 KM/H时，制冷量全部来自于吸收制冷子循环。并将此系统带入到实际道路工况中进行实用价值分析，分析表明1辆公交车1天的节约量为2.17 × 104 KJ，此节约量对燃油的节省是非常可观的。

Abstract: Based on the improvement and optimization of the previous single stage, absorption-compression mixed re- frigerant cycle, two-stage absorption/compressed mixed refrigerant circulating system was proposed in which the high and low voltage generator was arranged in an inverted tandem and the absorption-refrigeration sub-cycle was driven by engine waste heat (exhaust gas and cooling liquid). The system was carried out the thermodynamic cycle calculation with R124-DMAC working fluid as refrigerant in the design conditions (air temperature 35°C, condensing temperature 55°C, the refrigerant evaporation temperature 3°C, the cooling load 30 kW). It found that when speed ≥ 23 KM/H, the absorption sub-cycle begin to provide cooling capacity; when speed ≥ 85 KM/H, all cooling capacity come from the absorption refrigeration sub-cycle. The practical value analysis was also carried out by bringing it into the actual road conditions, the results showed that the savings of a bus per day is 2.17 × 104 KJ, which is a quite considerable value for the fuel savings.