Thermal energy is produced during periods of off-peak electrical demand (or usage), collected in a thermal energy storage tank, then withdrawn and distributed to the facility during on peak periods, optimizing energy cost. Warm and chilled water enters and exits the tank through diffusers located at the top and bottom of the tank. This process is controlled by flow measurement and level measurement.
The hot water enters from the chiller to the cooling towers. Cooling towers are used for rejecting the unwanted heat from the chillers. Temperature sensor are installed at the inlet and outlet of the cooling tower to measure the water temperature.
Process pumps are responsible for pumping the water throughout the process. Optimal control is vital for energy efficiency, as process pumps use 20-30% of the plant’s energy. SIMOTIC Motors offer a wide range of power ratings and a high level of efficiency.
The control room is the brain of the plant. It includes the main controller (PLC) that is responsible for controlling the whole process. The SCADA system is transferring the data from the process to a graphical interface, which allows the operator to monitor and control the plant, identify optimization potential and minimize downtime.
The energy transfer station (ETS) is located at the consumer site (i.e. buildings, malls, universities etc.), and is responsible for transferring the cooled water from the district cooling piping system to the consumer HVAC system.
Pumps and motors are enabling the water flow. Flowmeters and pressure transmitters provide accurate measurements on the pipe, generating usage data that will be used for efficient billing. This process is controlled by the PLC.