Refrigerated display case systems

A refrigerated display case system, comprising:

• a display case that defines an inner volume configured to store one or more perishable items;
• a closed-circuit refrigeration system, comprising:
• a condensing unit comprising at least one compressor and at least one condenser assembly that includes a condenser fan;
• and
• a cooling assembly that comprises at least one cooling coil and at least one evaporator fan configured to circulate an airflow from the inner volume through the at least one cooling coil to cool the airflow with a liquid phase of a hydrocarbon refrigerant supplied from the condensing unit, the at least one evaporator fan configured to circulate the cooled airflow to the inner volume to adjust or maintain a temperature of the inner volume;
• and
• a control system communicably coupled to the cooling assembly and the condensing unit and configured to perform operations comprising:
• operating the condensing unit and the cooling assembly in a refrigeration cycle to cool the inner volume and a defrost cycle to defrost the cooling assembly;
• and
• operating the condenser fan independent of the refrigeration cycle and the defrost cycle.

A refrigerated display case system, comprising:

• a display case that defines an inner volume configured to store one or more perishable items;
• a closed-circuit refrigeration system, comprising:
• a condensing unit comprising at least one compressor and at least one condenser assembly that includes at least one condenser fan;
• and
• a cooling assembly that comprises at least one cooling coil and at least one evaporator fan configured to circulate an airflow from the inner volume through the at least one cooling coil to cool the airflow with a liquid phase of a hydrocarbon refrigerant supplied from the condensing unit, the at least one evaporator fan configured to circulate the cooled airflow to the inner volume to adjust or maintain a temperature of the inner volume;
• at least one exhaust fan positioned adjacent or near the display case;
• and
• a control system communicably coupled to the cooling assembly, the condensing unit, and the at least one exhaust fan, the control system configured to perform operations comprising:
• operating the condensing unit and the cooling assembly in a refrigeration cycle to cool the inner volume and a defrost cycle to defrost the cooling assembly;
• and
• operating the at least one exhaust fan independent of the refrigeration cycle and the defrost cycle.

A refrigerated display case system, comprising:

• a display case that defines an inner volume configured to store one or more perishable items;
• a closed-circuit refrigeration system, comprising:
• a condensing unit comprising at least one compressor and at least one condenser assembly that includes at least one condenser fan;
• and
• a cooling assembly that comprises at least one cooling coil and at least one evaporator fan configured to circulate an airflow from the inner volume through the at least one cooling coil to cool the airflow with a liquid phase of a hydrocarbon refrigerant supplied from the condensing unit, the at least one evaporator fan configured to circulate the cooled airflow to the inner volume to adjust or maintain a temperature of the inner volume;
• a refrigerant leak detection sensor;
• and
• a control system communicably coupled to the cooling assembly, the condensing unit, and the refrigerant leak detection sensor, the control system configured to perform operations comprising:
• operating the condensing unit and the cooling assembly in a refrigeration cycle to cool the inner volume;
• and
• operating at least one of the condensing unit or the cooling assembly in a defrost cycle to defrost the cooling assembly.

A refrigerated display case system, comprising:

• a display case that defines an inner volume configured to store one or more perishable items;
• a closed-circuit refrigeration system, comprising:
• a condensing unit comprising at least one compressor and at least one condenser assembly that includes at least one condenser fan;
• and
• a cooling assembly that comprises at least one cooling coil and at least one evaporator fan configured to circulate an airflow from the inner volume through the at least one cooling coil to cool the airflow with a liquid phase of a hydrocarbon refrigerant supplied from the condensing unit, the at least one evaporator fan configured to circulate the cooled airflow to the inner volume to adjust or maintain a temperature of the inner volume;
• a condensing unit housing that at least partially encloses the condensing unit on a top portion of the display case;
• and
• a refrigerant piping chase that extends at or adjacent the condensing unit housing to at or adjacent the cooling assembly, the refrigerant piping chase configured to at least partially enclose one or more refrigerant piping conduits between the condensing unit and the cooling assembly.

A refrigerated display case system, comprising:

• a display case that defines an inner volume configured to store one or more perishable items;
• a closed-circuit refrigeration system, comprising:
• a condensing unit comprising at least one compressor and at least one condenser assembly that includes at least one condenser fan;
• and
• a cooling assembly that comprises at least one cooling coil and at least one evaporator fan configured to circulate an airflow from the inner volume through the at least one cooling coil to cool the airflow with a liquid phase of a hydrocarbon refrigerant supplied from the condensing unit, the at least one evaporator fan configured to circulate the cooled airflow to the inner volume to adjust or maintain a temperature of the inner volume;
• a grease and condensate trap assembly fluidly coupled to at least one drain of the display case, the grease and condensate trap assembly configured to receive liquid and particulates from the at least one drain and separate the liquid from the particulates;
• and
• a condensate pump positioned in a liquid reservoir of the grease and condensate trap assembly and configured to circulate the separated liquid from the liquid reservoir to an evaporator pan of the condensing unit.