Air conditioning system components-part2

1. Temperature Controller

The temperature controller is used for the control or protection of the unit. When the temperature reaches the set value, the switch automatically cuts off (or turns on) the circuit. In our products, the temperature control is often used, and the temperature of the water tank is used to control the start and stop of the unit. 

There are also some like antifreeze that require the use of a temperature controller.

2. liquid sight glass

The sight glass is used to indicate: 1. The condition of the refrigerant in the liquid pipeline in the refrigeration unit; 2. The water content in the refrigerant; 3. The flow of the lubricating oil from the oil separator in the oil return pipeline. Some sight glasses have an indicator that changes its color to indicate the water content in the refrigerant.

3. Expansion tank

1)The volume of water changes due to temperature changes, and the expansion tank is used to store this part of the expansion water;

2)It plays the role of voltage regulation and constant pressure on the system;

3)Part of the water can be compensated for the system.

4. Cooling Tower

The function of the cooling tower is to exchange heat with the air in the cooling water carrying the heat in the tower, so that the heat is transferred to the air and dissipated into the atmosphere. 

One of the heat exchange methods between water and air in the cooling tower is that the air flowing over the water surface is in direct contact with the water, and the heat in the water is transferred to the air through contact heat transfer and evaporative heat dissipation. 

Cooling in this way is called a wet cooling tower. The heat exchange efficiency of the wet cooling tower is high, and the limit temperature of the water being cooled is the wet bulb temperature of the air. However, water loss is caused by evaporation; evaporation increases the salinity of the circulating cooling water. 

In order to stabilize the water quality, part of the water with higher salinity must be drained; wind blowing will also cause water drift loss. Sufficient fresh water must be continuously replenished. 

Therefore, the wet cooling tower needs a water source for supplying water. In water-deficient areas, dry cooling towers can only be used when it is difficult to replenish water. The heat exchange between air and water in the dry cooling tower is to transfer heat through the surface of the radiator composed of metal tubes, and transfer the heat of the water in the tube to the air flowing outside the radiator. 

The heat exchange efficiency of the dry cooling tower is lower than that of the wet cooling tower, and the limit temperature of cooling is the dry bulb temperature of the air. The one-time investment of these devices is large, and the fan energy consumption is high. 

The process of cooling water in a cooling tower is a heat and mass transfer process. The cooled water is distributed to the inner packing of the cooling tower by a nozzle, a water distributor or a water distribution plate, which greatly increases the contact area between the water and the air. Air is circulated by the induced effect of fans, forced air, natural wind or jets.

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