混合式地源热泵系统的运行控制策略研究

针对目前比较流行的混合式地源热泵系统,提出了三种运行控制策略并建立了基于圆柱热源理论的评价模型。模拟运行结果表明,运行控制策略面临地下热平衡与冷却塔运行时间之间的协调优化问题。从冷却塔运行节能及地下冷热平衡的角度考虑,建议采用设定地埋管换热器流体平均温度或设定地埋管换热器流体温度与环境湿球温度的差值的控制策略。混合式系统应综合考虑各种影响因素以确定合适的运行控制策略,必要时也可采用三种控制策略相互组合的运行方式。

Operating control modes of a hybrid ground-source heat pump system

Aiming at popularly used ground-source heat pump systems,presents three operating control modes and establishes an evaluation method based on the cylindrical source theory.Simulated results show that there exists an optimization problem between the underground thermal balance and running time of cooling towers.From the viewpoint of energy efficiency of cooling towers and underground thermal balance,recommends the operating mode by setting the average water temperature of buried exchangers or by setting the difference between the water temperature of buried exchangers and the wet-bulb temperature of environment.The operating modes of the hybrid systems shall be determined based on the integration of different factors and the proper combination of the three modes is also allowed if necessary.