Energy savings with electronic expansion valve

The solution proposed by CAREL has been installed and examined in one of the control rooms at the TELECOM ITALIA installation in Corticella (Bologna), on 8 direct expansion air-conditioners operating on R22, with a total capacity of 120 kW.
The air-conditioners are fitted with mechanical thermostatic valves (TEV), hermetic compressors with condenser control and are managed by an external PLC that controls the temperature in the room by enabling the compressors in groups of 3, with stepped control logic.
The CAREL system is made up of E2V (electronic expansion valves - EEV - with stepper motor), EVD (microprocessor controllers for managing the electronic valves), pCO (microprocessor controllers for managing the air-conditioners with condenser control).
The experience has shown considerable margins of improvement in terms of energy savings in air-conditioning systems for TELECOM ITALIA applications.
For an installation with a rated capacity of 120 kW the energy savings achieved were 28%, which for the installation in question means € 6000 per year.
At the same time, there is a reduction in the environmental impact in terms of CO2 emissions from the generation of electricity.
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