湿空气系统

该示例对车辆暖通空调 (HVAC) 系统中的湿空气流动进行建模。车辆座舱表示为与外部环境交换热量的湿空气体积。湿空气流经再循环风门、鼓风机、蒸发器、混合门和加热器，然后返回座舱。再循环风门选择从座舱或外部环境流动进气。混合门引导加热器周围的气流来控制温度。

Models an aircraft environmental control system (ECS) that regulates pressure, temperature, humidity, and ozone (O3) to maintain a comfortable and safe cabin environment. Cooling and dehumidification are provided by the air cycle machine (ACM), which operates as an inverse Brayton cycle to remove heat from pressurized hot engine bleed air. Some hot bleed air is mixed directly with the output of the ACM to adjust the temperature. Pressurization is maintained by the outflow valve in the cabin. This model simulates the ECS operating from a hot ground condition to a cold cruise condition and back to a cold ground condition.

此示例展示如何使用自定义 Simscape™ 模块对质子交换膜 (PEM) 燃料电池电堆进行建模。PEM 燃料电池通过消耗氢气和氧气并产生水蒸气来发电。该自定义模块代表膜电极组件 (MEA)，并连接两个独立的湿空气网络：一个用于阳极气体流，一个用于阴极气体流。

此示例展示如何使用自定义 Simscape™ 模块对质子交换膜 (PEM) 水电解槽进行建模。PEM 电解槽消耗电能将水分解成氢气和氧气。该自定义模块代表膜电极组件 (MEA)，并连接到一个热液体网络和两个独立的湿空气网络：热液体网络对供水进行建模，阳极湿空气网络对氧气流进行建模，阴极湿空气网络对氢气流进行建模。

此示例对正压医用呼吸机系统进行建模。向患者提供预设流量。肺部使用平移机械转换器 (MA) 建模，该转换器将湿空气压力转换为平移运动。通过将接口横截面积设为单位值，机械平移网络中的位移代替了体积，力代替了压力，弹簧常量代替了呼吸弹性，阻尼系数代替了呼吸阻力。

Models an oxygen concentrator device coupled to a lung model. One of the two sieves filters out nitrogen from the air to produce concentrated oxygen in the product tank. The two sieves switches periodically so that while one sieve is filtering, the other can purge the adsorbed nitrogen. When the lung model inhales, some of the oxygen-rich gas from the product tank is mixed into the inspiratory flow.

How the Simscape™ Foundation Library moist air components can be used to model a pneumatic actuator operating in a humid environment. The Directional Valve is a subsystem composed of four Variable Local Restriction (MA) blocks, and the Double-Acting Actuator is a subsystem composed of two Translational Mechanical Converter (MA) blocks in opposite mechanical orientation.