Operating Principle

The cooling unit works based on a refrigeration circuit consisting of the following components:

• Compressor: pump that increases the pressure and temperature of the refrigerant gas.

• Evaporator: heat exchanger that collects the heat generated inside the electrical enclosure.

• Condenser: heat exchanger that delivers the heat collected inside the electrical enclosure to the ambient air.

• Expansion device: device that regulates the flow of refrigerant between the condenser and the evaporator.

• Dehydrator filter: filter that helps to protect the refrigeration circuit by capturing impurities, acid, and moisture from the circuit.

The circuit is sealed and the refrigerant circulates inside it. The refrigerant used is R134a, free from chlorine, and not damaging to atmospheric ozone. The cooling unit is divided into two sections, hermetically separated, where the environmental air and the enclosure air are both treated, without meeting each other.

The enclosure temperature is lowered as follows: The compressor (D) compresses the refrigerant (thus taking it to high pressure and high temperature), and pushes it through the condenser (B). In the condenser, the refrigerant is cooled by the ambient air; resulting in the change of state from gas to liquid. When in the liquid state, the refrigerant passes through the expansion device (G), where the pressure difference makes the refrigerant spray out. Then the refrigerant reaches the evaporator (E). In the evaporator, the refrigerant absorbs the heat from the enclosure air, resulting in the change of state from liquid to gas. The gas is then redirected to the condenser by the compressor, and the cycle is repeated.