ET 620 represents a real air conditioning and ventilation system. The system capacity is sufficient to climatise a laboratory room. Unlike small systems that use conventional climate controllers, this experimental system is equipped with a modern building management system for control. This corresponds to the state of the art for large air-conditioning systems and is advantageous when presenting complex learning content. For example, real components with the comparative processes are converted into formative images.
The air conditioning and ventilation system includes a filter element, a ventilator with EC motor and controlled speed, a water chiller with an air cooler, an electric air heater and humidification by steam humidifier. The following functions are possible: heating / cooling and humdifiying / dehumidifying. For this purpose the active components can be run either manually individually or via a central PLC in automatic operation. The PLC controls the temperature and air humidity independent of each other. In the PLC, complex processes, such as changes of state, are visualised by real-time representation of the cycle, e.g. in the h,x diagram. Intuitive operation of the PLC makes it easy to adjust all elements of the cycle. The effect of the modifications is immediately visible on the touch screen.
Pressure losses can be measured at each section of the duct. All common components, such as filter, air heater / air cooler, outlets, smoke detector, multi-leaf dampers, inspection and fire protection flaps are available and can be investigated.
The air conditioning and ventilation system consists of two independent system components: main unit and water chiller. The connection is performed via hoses. Due to the waste heat the water chiller should not be placed inside the room to be climatised.
The experimental plant is controlled by the PLC via touch screen. By means of an integrated router, the experimental plant can alternatively be operated and controlled via an end device. The user interface can also be displayed on additional end devices (screen mirroring). Via the PLC, the measured values can be stored internally. Digital multimedia teaching material is available at the Science Media Center. In addition to real-time representation directly on the unit, Game-Based Learning is made possible with these online media, e.g. worksheets, e-learning, videos, etc.