Energy-Efficient Ventilation with the Climate Guard: Optimum Indoor Climate with Minimum Energy Expenditure  

The Climate Guard from J. Dittrich Elektronic (Germany) is a network-compatible multi-sensor system that facilitates demand-controlled, energy-efficient ventilation for special-purpose buildings.
It measures the important parameters of indoor air: the carbon dioxide concentration by means of a dual beam infrared photometer (NDIR); the temperature by means of a bandgap sensor; and the relative humidity by means of a capacitive polymer. Both the power supply and digital transmission of measured values are effected via an Ethernet connection (PoE). Since the Climate Guard has its own web server, it can be integrated directly into a local network or the Internet and data called up using a web browser. This is ideal for automated buildings.
All three measured variables increase in indoor air in proportion to the number of people present. For this reason they help to control ventilation such that only the exact amount of fresh air that is actually required is drawn in from outside. Ultimately, exhaled carbon dioxide, human emanations and volatile organic substances from interior fixtures and fittings would otherwise accumulate in the indoor air, making people tired and lacking in concentration. Too much air exchange, by contrast, such as when the room is empty, would dissipate unnecessary amounts of energy.
Depending on the model and room use, the possible energy saving for energy-efficient, demand-controlled ventilation compared with time-controlled or uncontrolled ventilation is between approx. 20 and 70%.