초록 ▼

A gas defrost apparatus for melting frost and ice from evaporators in commercial refrigeration systems using a pressure differential hold back valve to direct superheated refrigerant in a reversed direction into the evaporators and a gas return conduit for reintroducing the refrigerant into the main

A gas defrost apparatus for melting frost and ice from evaporators in commercial refrigeration systems using a pressure differential hold back valve to direct superheated refrigerant in a reversed direction into the evaporators and a gas return conduit for reintroducing the refrigerant into the main refrigerant distribution system between the compressors and condensers. Reintroducing the refrigerant on the high side of the condensers between the compressors and condensers prevents inefficiencies in the refrigeration system.

대표청구항 ▼

A refrigeration system with an integral defrost system comprising compressor means for superheating a refrigerant within said system; condenser means for affecting a phase change in said refrigerant from vapor to liquid within said condenser means; and evaporator means shiftable between a cooling mo

A refrigeration system with an integral defrost system comprising compressor means for superheating a refrigerant within said system; condenser means for affecting a phase change in said refrigerant from vapor to liquid within said condenser means; and evaporator means shiftable between a cooling mode and a defrost mode affecting a phase change in the refrigerant within said evaporator means from liquid to vapor in said cooling mode and from vapor to generally a liquid in said defrost mode; said compressor means, condenser means and evaporator means interconnected in series by conduit means including a first conduit connecting said compressor means and said condenser means for communicating said superheated refrigerant from the compressor means to the condenser means; valve means within said first conduit and switchable between an open position when said evaporate means is in its said cooling mode and a holdback position when said evaporator means is in its said defrost mode; a second conduit connected to said first conduit between said compressor means and said valve means and extending to said evaporator means for communicating the superheated refrigerant from the compressor means into the evaporator means when the evaporator means is in its said defrost mode; said valve means when in its holdback position for causing a pressure difference between refrigerant upstream and downstream of said valve means within the first conduits wherein at least a portion of said superheated refrigerant passes into said second conduit; and a conduit extending from said evaporator means and connected to said first conduit between said valve means and said condenser means for communicating refrigerant to the condenser means from the evaporator means when the evaporator means is in its said defrost mode.