直膨式太阳能热泵热水器微型控制系统的单片机设计

Design of MCU-based auto-control system for the direct expansion solar assisted heat pump water heater

阐述了一种基于Renesas单片机的直膨式太阳能热泵热水器中央控制器的硬件设计和软件算法设计。硬件设计着重于系统的功能性和可靠性;控制算法以太阳辐射强度变化和过热度偏差变化为输入量,以电子膨胀阀开度变化以及变频器运行频率为输出量,在安全运行的前提下保持较低的过热度,最大限度地利用蒸发器的面积,有效地管理压缩机运行,实现压缩机容量调节,使系统得到合理匹配及稳定运行。

The design of an auto-controller based on Renesas Micro-Controller in the central control system of Direct Expansion Solar Assisted Heat Pump Water Heater （DX-SAHPWH）is demonstrated in this paper. The method of hardware design and software design are both shown. The hardware design mainly focuses on the functionality and reliability of the system. As to the software arithmetic design, the position variety of Electronic Expansion Valve （EEV） and the run- ning frequency of the compressor are calculated with the variety of the solar radiation and the super-heat difference. In this way, the lower super-heat can be maintained so as to make the most use of evaporator in the premises of safe running; and the compressor function can be efficiently managed and also the capacity of the compressor can be adjusted, this makes the system to have a reasonable match among its components and to have a stable run.