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一、制冷循环的实际运行工况在分析制冷循环时,常用 lgP—i 图。在采用氨双级压缩带中间冷却器时,其循环过程为图一。常用该图来说明制冷的循环过程,计算制冷量,选择压缩机等。但用该图计算得出多点的参数,与实际运行过程的参数相比,仍有较大的出入。首先表现在高、低压级的排汽温度,实际运行温度比计算出来的结果往往高出15℃,甚至20℃以上。其次是压力,理论计算中,低压级排出的压力就是高压级的吸入
First, the actual operating conditions of the refrigeration cycle In the analysis of the refrigeration cycle, commonly used lgP-i map. In the ammonia two-stage compression with the intercooler, the cycle of Figure 1. Commonly used to illustrate the diagram of the refrigeration cycle, calculate the cooling capacity, select the compressor. However, using the figure to calculate the multi-point parameters, compared with the parameters of the actual operation, there is still a large discrepancy. First of all, the performance of high and low pressure level of the exhaust temperature, the actual operating temperature than the calculated results are often higher than 15 ℃, or even above 20 ℃. Followed by the pressure, the theoretical calculation, the low-pressure-level discharge pressure is high-pressure level of inhalation