In a
refrigeration plant, in a direct expansion evaporator :
प्रशीतन संयंत्र में, प्रत्यक्ष विस्तार बाष्पीकरणकर्ता में:
Liquid refrigerant
evaporates outside the tubes in a shell and tube heat exchanger
There is a coil with smooth surface inside for refrigerant evaporation
The
refrigerant evaporates in a finned coil, which cools air or liquid flowing
across it
There is no
need of a throttling device
The
refrigerant evaporates in a finned coil, which cools air or liquid flowing
across it
Direct
expansion fin and tube type:
These evaporators are used for cooling and dehumidifying the air directly by the refrigerant flowing in the tubes. Similar to fin and tube type condensers, these evaporator consists of coils placed in a number of rows with fins mounted on it to increase the heat transfer area.
Hence, the correct option is (C).
&Key Points:-
●When
evaporator is close to the compressor, a direct expansion coil is used since
the refrigerant lines are short, refrigerant leakage will be less and pressure
drop is small.
●If air
conditioning is required away from the compressor, it is preferable to chill
water and pump it to air cooling coil to reduce the possibility of refrigerant
leakage and excessive refrigerant pressure drop, which reduces the COP.
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