SNDC

Heating and Air-conditionig Equipement manufacturer
Thermal comfort and air quality

Air-conditioning

 

| Air-conditioning | Heating | Defrosting and demisting | Ventilation | Filtration | Pressurisation | Research Innovation | Custom Design |

 

Air-conditioning

The efficiency of the air-conditioning system relies on the correct dimensioning of components based on thermal exchanges between the cabin and its environment. System efficiency.

Schéma circuit de climatisation

How air-conditioning works

 

 

The A/C system is made of five main components:

 

A compressor, a condenser, a filter drier, an expansion valve and an evaporator.

 

These components are connected together by fittings and flexible hoses, or rigid lines, thus forming a closed circuit with the coolant circulating inside. The principle of the AirCon system is based on the ability of the coolant to absorb or transfer the heat depending on its physical state.

 

 

 

Compresseur de climatisation

Air-conditioning system diagram

The compressor

Driven by the vehicle engine, it circulates the coolant in the circuit by sucking it in the gaseous state, and discharging it in the gaseous state to the condenser at high pressure and high temperature.

Condenseur climatisation

 

The condenser

is a heat exchanger in which the coolant changes from the gaseous state to the liquid state by transferring its heat to the outside air. The air is moved through the condenser by one or more mechanical or electric fans.

 

 

Filtre déshydrateur

 

The filter drier

Placed at the outlet of the condenser, it filters the liquid refrigerant. It keeps dirt and moisture and provides a buffer reserve.

 

 

Détendeur

 

 

The expansion valve

Its role is to lower the refrigerant pressure and temperature by controlling its flow rate in the evaporator.

 

 

 

 

Evaporateur

The evaporator

Allows passing the refrigerant from the liquid state to the gaseous state. To evaporate, the refrigerant absorbs heat from the air passing through it. The air, cooled and dried is blown into the cabin. The condensate left on the walls of the evaporator is collected in a drain tray and discharged under the cab. At the outlet of evaporator, the refrigerant in gaseous state is sucked by the compressor and starts a new cycle.

 

Safety components

Thermostat et pressostat

Thermostat (temperature regulation at the evaporator outlet avoids liquid ingress in the compressor).

 

Pressure switch (compressor cuts out if pressure is too high or too low).