When you choose units from our GreenMaster series of controls, either through GreenManager or AirPLC, you get a complete air handling unit equipped with a practical touch display that we call WAVE. We are constantly working to improve the software and add smart features according to your wishes to maximize energy efficiency that you can easily follow up via EnergyMaster.

The customisable functions include, for example, zone control, various fire functions and a very smart defrost function. To facilitate installation and ensure optimal performance for each project, the units are supplied with project specific wiring diagrams and flowcharts.

The clear WAVE touch display with quick response and easy navigation gives you the ability to optimize flows, temperatures, P-bands, I-time, and manage communication settings and more.

We have also integrated several fieldbuses, such as Modbus RTU, Modbus TCP, SIOX Net, ADS and OPC-UA, to give you greater flexibility and customization options in your air handling unit. This allows for seamless integration with other systems and gives you the freedom to tailor the device to project specific needs.

Challenge and ask us!

Defrosting for GreenMaster - XXL

The defrosting problem is a recurring phenomenon in air handling units throughout the industry. That's why we've taken this very seriously at AirSite. The defrost function is pre-programmed in both GreenManager and AirPLC. The GreenMaster XXL is equipped with 2 plate heat exchangers. This dual plate heat exchanger design provides a significantly larger total surface area compared to counterflow exchangers. Combined with our advanced control technology, this leads to an extended time until a complete freeze has occurred, which in turn minimizes the impact on the total energy recovery. 

Simply explained:

A sectional defrosting system is mounted at the heat exchanger in the unit. Defrosting is initiated by sequentially shutting down individual damper motors, each controlling a section of dampers (4-6 units, depending on unit size). Each section has a specific time interval. The defrosting process starts when AirPLC or GreenManager detects deviating values, including temperature.

Our method does not use a bypass to meet the defrosting challenge and thus there is up to 66% energy savings on the post-heating coils compared to classic counter-current exchangers.

When compared to competitor's air handling unit runs, it becomes clear that our temperature after the exchanger when defrosting is +10-15⁰C depending on which exchanger you have chosen, while most counter-flow exchangers only reach ±0⁰C.

The energy consumption for heating 1m³/s of air from ±0⁰C to +20⁰C is 24 kW. In one example, our unit managed with only 9.53 kW as it was allowed to heat up from 11.9⁰C to 20⁰C after the heat exchange, which means that we have used only 40% of the energy in this example.

This means that owning a GreenMaster-XXL will always be more cost-effective in the long run.

Discuss the defrosting function with us!