空气源热泵机组动态仿真数学模型

为研究大型活塞式空气源热泵机组启机过程和能量调节过程的动态特性,建立了空气源热泵机组动态仿真数学模型,模型中对换热器采用分区集中参数法,即移动边界法进行建模,将压缩机与膨胀阀考虑成小惯性的稳态环节处理,提出了完善可行的空气源热泵机组动态仿真流程。分析了活塞式压缩机的能量调节策略。利用所建模型对一个实际空气源热泵机组典型动态过程进行了计算机仿真,仿真结果与实测结果平均误差在10%以内,说明所建模型可以对实际运行的大型活塞式空气源热泵机组动态启机和能量调节过程进行准确仿真,仿真结果可用于机组运行调节参数的优化,指导机组的实际运行。

ESTABLISHMENT AND VALIDATION OF DYNAMIC SIMULATION MODEL FOR AIR SOURCE HEAT PUMP UNIT

In order to get the dynamic characteristics of air source heat pump unit during the start-up and energy regulating processes, a dynamic simulation model was setup. Moving boundary method was used in the model for the heat-exchangers. The compressor and expansion valve were enacted as steady-state components considering their relative short time constant. The whole dynamic simulation process was put forward. The energy regulating strategy of the piston compressor was analyzed in detail. A typical dynamic operating process was chosen to validate the model. The average error between the simulating results and the field-testing results was below 10%, which indicates that the model established in this paper can be safely applied in simulating the start-up and energy regulating processes of the air source heat pump unit.