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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Real-time efficiency optimization of a cascade heat pump system via multivariable extremum seeking
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Real-time efficiency optimization of a cascade heat pump system via multivariable extremum seeking

机译：通过多变量极值探索级联热泵系统的实时效率优化

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摘要

In this paper, the Extremum Seeking Control (ESC) is proposed as a model-free real-time optimizing control strategy for efficient operation of a cascade air source heat pump (CASHP). ESC is a model-free real-time optimization framework, which can search for the unknown and slowly varying input setpoint for optimizing specific performance index. The ESC strategy is realized for the scenarios of power minimization and COP maximization, respectively. For the power minimization, the ESC optimizes the setpoints of intermediate temperature and the superheat setpoints for the high-temperature and low temperature cycles; while for the COP maximization, the manipulated inputs are the compressor speeds of the high-temperature and low-temperature cycles and the evaporator fan speed. To validate the effectiveness of the proposed ESC strategy, a Modelica based dynamic simulation model of a CASHP water heater is built with Dymola and TIL Library. The CASHP is designed to provide the discharge water temperature of 85 degrees C, with R404A and R245fa as the refrigerants for the low temperature cycle and high temperature cycle, respectively. Under both fixed and realistic ambient temperature profiles, the simulation results show satisfactory convergence performance for both steady-state and transient characteristics. Thus, the feasibility of the proposed CASHP control strategy is validated.
机译：在本文中，提出了极值寻求控制（ESC）作为无模型实时优化控制策略，用于级联空气源热泵（CASHP）的有效运行。 ESC是一种无模型的实时优化框架，可以搜索未知和慢速改变的输入设定点，以优化特定的性能索引。 ESC策略分别实现了功率最小化和COP最大化的情况。对于功率最小化，ESC优化了高温和低温循环的中间温度和超热设定点的设定点;虽然对于COP最大化，但是操纵输入是高温和低温循环和蒸发器风扇速度的压缩机速度。为了验证所提出的ESC策略的有效性，采用Dymola和TIL库建造了Cashp热水器的基于ModelICA的动态仿真模型。 CASHP旨在提供85℃，R404A和R245FA作为低温循环和高温循环的制冷剂的排放水温。在固定和现实的环境温度曲线下，仿真结果表明稳态和瞬态特征的令人满意的收敛性能。因此，验证了拟议的CASHP控制策略的可行性。

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