Development and Solution of Mathematical Model for Dry-type Shell-tube Evaporator Used in Sewage Source Heat Pump
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摘要:
提出了一种具有自动除污功能的干式壳管式污水换热器.从制冷系统热动力学的理论出发,结合两相流理论,建立了干式壳管式污水蒸发器分布参数数学模型.首次采用两侧流体相互迭代与单侧流体单向求解相结合的方式对模型进行编程求解.通过污水热泵实验台的实验数据同模拟计算的结果进行对比,验证了数学模型与求解方法的准确性.模拟结果表明,蒸发器内制冷剂侧压力降最大为0.34 k Pa,可以忽略不计.
Abstract:
A shell-tube sewage heat exchanger with auto-de-fouling function was first developed, followed by the modeling of its distributed model for the dry-type shell-tube sewage evaporator according to the theory of two-phase flow and thermodynamics of refrigeration systems. Then the model was solved by combining iterating two-side fluids with unidirectional solving of single-side flow. By comparing the simulation results with the experiment data, the accuracy of the simulation program was proved. The results have shown that the maximum refrigerant pressure drop in the evaporator is 0.34 kPa.
