研究了末端设置通断控制阀的一次泵变流量系统在温差控制下的水力特性，并结合风机盘管与房间的非线性换热耦合特性，进一步探讨了温差控制的适用条件以及变温差控制温差值的设定方法。结果表明：末端设置通断控制阀的系统，当管网整体负荷分布均匀且各开启用户的负荷变化规律相近时，温差控制同样是较为适用的，此时系统的水力失调对室内温湿度的影响较小；采用变温差控制时，仅以不同的总负荷率分段设置温差值，并不能获得良好的室内温湿度控制效果，建议以优先保证风盘除湿能力和室内干球温度为原则设定温差值，相比于目前的方法，在同等的室内相对湿度波动下，室内温度的稳定性可以得到保证。

The hydraulic characteristics of the variable primary flow system with on-off valves under temperature difference control is investigated, and the nonlinear heat exchange coupling property of fan coil units and rooms is combined to further explore the applicable conditions of temperature difference control and setting procedures of temperature difference value(TDV). The result indicates that the temperature difference control in the system with on-off valves at the terminal is also applicable when the pipe network's load is equally distributed and the load changing rule of each opening user is similar. In this case, the system's hydraulic disorder has smaller impact on the indoor temperature and humidity. When adopting variable temperature difference control, setting TDV piecewise according to different total load rates cannot have good control of indoor temperature and humidity. Therefore, it is recommended to set TDV according to ensure fan coil's dehumidification capacity and indoor dry-bulb temperature preferentially, compared with current methods, the stability of indoor temperature can be guaranteed under the same fluctuation of the indoor relative humidity.

国家科技支撑计划(2014BAJ02B01)；科研院所技术开发研究专项资金项目(2009EG131249)