| 摘要 |
An improved refrigeration system that has an air cooled condenser exposed to outdoor ambient conditions and which automatically maintains sufficient head pressure during cooler weather for adequate liquid flow to the expansion valve of the evaporator by backflooding the condenser. Sub-cooling of the liquid in the condenser results from the backflooding and this sub-cooled liquid flows into the liquid line to the expansion valve. The liquid line out of the receiver joins the liquid line below the receiver so that the pressure in the receiver can be used to maintain the liquid level and the presence of liquid at the condenser. Means is provided to control the refrigerant pressure in the receiver in response to liquid level in the outlet line from the condenser.
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