Description of Operation
When there is a simultaneous demand for cooling and heating, the Multi-functional unit will work in recovery mode, and move the thermal energy from rooms that need to be cooled to those that need to be heated. If the two heat loads are not balanced, then the controller works in mixed mode to recover as much thermal energy as possible and use the air exchanger as the heat source with which to exchange the excess capacity for meeting both demands of the system.
The 4-pipe multi-functional unit can work indirectly all year round to meet all the thermal and cooling energy demands of the system and is an excellent alternative to conventional systems utilising chiller/boiler combinations, with the additional advantage of recovering normally wasted energy. Depending on the various loads that may occur throughout a day, the multi-functional unit works automatically in cooling, heating and recovery mode, providing an energy-efficient alternative.