Scotsman NDE650 Wartungshandbuch PDF herunterladen (Seite 16)

OPERATION: Refrigeration

Beginning at the compressor, the refrigerant is

compressed into a high temperature gas. The

discharge line directs this gas to the condenser. At

the condenser (air or water cooled) the gas is

cooled by either air or water and it then condenses

into a liquid. This high pressure liquid then goes

through the liquid line to the expansion valve.

The thermostatic expansion valve meters liquid

refrigerant into the evaporator, the volume of liquid

refrigerant depending upon the temperature of the

evaporator; warmer evaporators get more

refrigerant and colder evaporators get less.

At the evaporator, the refrigerant enters an area of

relatively low pressure, where it can easily "boil

off" or evaporate. As it evaporates, it absorbs heat

from the evaporator and whatever is in contact

with it (such as the water inside it). After the

evaporator, the refrigerant, now a low pressure

vapor, goes through the suction line back to

compressor, where the cycle is repeated.

CONDENSER

COMPRESSOR

THERMOSTATIC

EXPANSION VALVE

EVAPORATOR

SUCTION LINE

DISCHARGE

LINE

LIQUID LINE

REFRIGERATION

SCHEMATIC

NDE550 & NDE650

April 1997

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Scotsman NDE650 Wartungshandbuch Seite 16