空调温度控制系统设计毕业设计.docVIP

空调温度控制系统设计 摘要 关键词：Air-conditioning Temperature Control System Design Abstract Air-conditioning temperature control has been depended on electric valve, electric valve can be used with matching Thermostat realize heating ventilation and air conditioning systems in hot and cold water control switch. Because many of Chinas industrial water containing Ca2 +, Mg2 +, Coo2-such as the hard water ions in high concentrations in the temperature of the air-conditioning pipes vulnerable to scaling, resulting in the early stage of electrical failure damaged valve. In addition, it is also often used in place of three-speed fan coil thermostat temperature control for electric valve, which is adjusted by manually switch the fan speed to achieve the thermostat can not be automatic temperature control, which inevitably occurs when low-load temperature overshoot caused by the waste of energy. The design of air-conditioning temperature control system, first of all through the temperature sensor DS18B20 collection of air temperature, the temperature will be collected to the single-chip signal transmission AT89C51, controlled by the single-chip display, and compare the collected temperature and set temperature is line, and then drive the heating or air conditioning to cool the air to deal with procedures, which simulate the temperature control unit for air conditioning work. Key words: Air-conditioning temperature control system; Temperature-controlled electric valve; Single-chip目 录 摘 要 I Abstract II 第一章 引 言 1 1.1 前言 1 1.2 空调的工作原理 1 1.3 空调的发展史 3 1.4 空调的发展趋势 4 1.5 总结 5 第二章 总体方案设计和选择 6 2.1 总体方案设计 6 2.1.1 方案一 6 2.1.2 方案二 6 2.1.3 方案三 7 2.2 总体方案选择及实现 8 第三章 硬件设计 9 3.1 硬件各单元方案设计与选择 9 3.1.1 温度传感部分 9 3.1.2 数字显示部分 10 3.1.3 加热降温驱动控制电路 11 3.1.4 键盘输入部分 12 3.2 单元电路设计 13 3.2.1 温度采集电路 13 3.2.2 LED显示电路 14 3.2.3 驱动控制电路 18 3.2.4 键盘设置电路 19 3.2.5 电源电路 21 3.2.6 外部晶振电路 22 3.3 元器件的选择 24 3.3.1 AT89C51简介 24 3.3.2 译码器CD4511 27 3.4 特殊器件的介绍 29 3.4.1 传感器的介绍 29 3.4.2 光电耦合器 36 第四章 软件设计