Energy saving refrigeration system

A refrigeration system including a gas defrost mechanism, said system comprising:

• compressor means for compressing gaeous refrigerant having a relatively high temperature to a relatively high pressure;
• condenser means coupled to said compressor means for condensing the gaseous refrigerant to a liquid;
• a plurality of evaporator means coupled in parallel for evaporating the liquid refrigerant at a relatively low pressure;
• suction means for returning evaporated refrigerant from said evaporator means to said compressor means;
• defrost means coupled to said compressor means for conducting gaseous refrigerant from said compressor means to said evaporator means;
• means for selectively connecting the low pressure side of said evaporator means to said suction means and said defrost means in dependence upon whether said evaporator means is selected to be in a regrigeration mode or defrost mode of operation, respectively;
• and
• flow period control means for enabling the flow of gaseous refrigerant to said evaporators during a defrost mode of operation, when selected, and after a first time period terminating such flow while preventing said evaporator means from returning to the refrigeration mode of operation for a second set time period of a sufficient duration so as to allow for condensation around said evaporator means to drain.

A refrigeration system comprising:

• compressor means for compressing gaseous refrigerant having a relatively high temperature to a relatively high pressure;
• condenser means coupled to said compressor means for condensing said gaseous refrigerant, for transferring the gaseous refrigerant into a liquid, said condenser means including a remote condenser to be located so that it is exposed to ambient air from outside of a building in which said refrigeration system is to be installed and a heat recovery condenser to be located with the building;
• a receiver coupled to said condenser means for receiving the liquid leaving said condenser means and temporarily storing such liquid;
• evaporator means coupled to said receiver for receiving liquid refrigerant from said receiver and evaporating the liquid refrigerant at a relatively low pressure when said evaporator means is in the refrigeration mode of operation;
• means for causing the gaseous refrigerant to normally flow only through said remote condenser and to flow through both said heat recovery condenser and said remote condenser when heat from said condenser means is to be utilized to help heat the building;
• and,
• condenser pressure regulated means coupled between said heat recovery condenser for maintaining the pressure of the refrigerant within the heat recovery condenser at a preselected level and bypass means for allowing refrigerant from within the heat recovery condenser to bypass said condenser pressure regulating means and flow directly from said heat recovery condenser to said remote condenser for reducing the pressure and temperature of the gaseous refrigerant in said heat recovery condenser, such bypass means primarily being utilized durig milder seasons of the year when less heat is needed.

A refrigeration system comprising:

• compressor means for compressing gaseous refrigerant having a relatively high temperature to a relatively high pressure;
• condenser means coupled to said compressor means for condensing the gaseous refrigerant to a liquid at a preselected condensing temperature, said condenser means including means for subcooling the liquid refrigerant to a temperature substantilly lower than the condensing temperature;
• receiver means coupled to said condenser means for receiving the subcooled liquid leaving said condenser means and temporarily storing such liquid;
• a plurality of evaporator means coupled in parallel for receiving liquid refrigerant from said receiver means and evaporating the liquid refrigerant at a relatively low pressure;
• suction means for returning evaporated refrigerant from said evaporator means to said compressor means;
• and,
• means for maintaining the pressure in said receiver means at a preselected level.