Electrolux FAC124P1A Betriebsanleitung PDF herunterladen (Seite 118)

Section 6 Sealed System

6-4

Basic Components

The basic components of an air conditioner are a

compressor, condenser, evaporator and heat exchanger

(capillary tube and suction line).

Refrigerant Cycle

A typical sealed refrigeration system consists of a cooling

coil (evaporator) located on the room side, a heat

rejection coil (condenser) located outside, and an electric

self-contained motor/compressor to circulate a refrigerant

through the system and develop the necessary pressure

differential to make the system work. Copper tubing,

sized to carry the volume of refrigerant to be circulated,

connects these components in a continuous loop,

evaporator to compressor to condenser then back to the

evaporator. The tube connecting the condenser to the

evaporator also serves as a refrigerant ﬂ ow control. This

tube (restictor tube) has a very small inside diameter.

The combination of this small diameter and extra length

of this tube restricts the ﬂ ow of liquid refrigerant,

maintaining the pressure differential necessary for the

function of the refrigeration system. A cone shaped

strainer is placed in the last pass of the condenser to

prevent any foreign material from clogging the restrictor

tube.

Condenser

Compressor

Evaporator

Condenser

Compressor

Filter-Drier

Evaporator

Room Air Conditioner Sealed System

Figure 6-1. Air-Conditioner Sealed System

Lower illustration shows location of added filter-

drier after servicing the sealed system.

The operation of the refrigeration system involves three

basic physical laws:

1. The physical state of a substance (solid, liquid or

gas) is directly related to the heat contained in the

substance.

2. A great amount of heat is required to change the

state of a substance (solid to liquid, liquid to gas,

and visa versa) with no change in its temperature.

3. The temperature at which a substance changes from

liquid to gas and gas to liquid depends upon the

pressure on the substance.

In operation, the compressor lowers the pressure on

the liquid refrigerant in the evaporator to the point at

which the refrigerant will change from a liquid to a gas at

temperatures ranging between 35°F and 50°F. The heat

required for this change of physical state is obtained from

the room air circulated through the evaporator ﬁ ns. Heat

is absorbed by the refrigerant, not only from the air, but

from moisture in the air as well. The air is cooled and

the moisture condenses on the evaporator ﬁ ns.

As the refrigerant liquid continues to vaporize, the

pressure in the evaporator tends to rise. However, the

compressor removes vapor at rate which maintains the

desired pressure and temperature in the evaporator.

The compressor discharges the refrigerant gas into the

condenser where the pressure builds up against the

restrictor tube. As the pressure of the gas increases,

so does its temperature. When the temperature of the

gas in the condenser exceeds the temperature of the air

passing through the condenser, heat is transferred from

the gas to the outside air. This loss of heat causes the

refrigerant gas to condense back to a liquid.

The small diameter restrictor tube between the

condenser and the evaporator maintains the pressure

difference created by the compressor, and meters the

liquid refrigerant back to the evaporator. The refrigerant

cycle is now complete and will continue until the

compressor is turned off by the thermostat.

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 139 140

Kommentare zu diesen Handbüchern

Keine Kommentare

Electrolux FAC124P1A Betriebsanleitung Seite 118

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Split-System-Klimaanlagen Electrolux FAC124P1A