Foul-resistant condenser using microchannel tubing

A refrigerated merchandiser comprising:

• an enclosure having a front wall partially defining a refrigerated display cabinet and having an access opening in said front wall for providing access to the refrigerated display cabinet;
• an evaporator coil disposed in operative association with the refrigerated display cabinet;
• a compartment heat insulated from the refrigerated display cabinet;
• a condenser coil disposed within said compartment;
• a condenser fan disposed within said compartment for circulating air over said condenser coil;
• and
• a compressor disposed within said compartment and connected in refrigerant flow communication with said evaporator coil and said condenser coil for circulating refrigerant through said evaporator coil and said condenser coil;
• said condenser coil having at least one header for receiving refrigerant vapor from said compressor and having a plurality of microchannel tubes each with a plurality of longitudinally extending channels that are fluidly connected at their ends to receive refrigerant vapor new from said at least one header, said plurality of tubes having generally flat sides that are generally aligned with the direction of airflow thereover and with the spacing between adjacent tubes being in the range of 0.4 to 0.8 inches.

A refrigerated merchandiser comprising:

• an enclosure having a front wall partially defining a refrigerated display cabinet and having an access opening in said front wall for providing access to the refrigerated display cabinet;
• an evaporator coil disposed in operative association with the refrigerated display cabinet;
• a compartment heat insulated from the refrigerated display cabinet;
• a condenser coil disposed within said compartment;
• a condenser fan disposed within said compartment for circulating air over said condenser coil;
• and
• a compressor disposed within said compartment and connected in refrigerant flow communication with said evaporator coil and said condenser coil for circulating refrigerant through said evaporator coil and said condenser coil;
• said condenser coil having a plurality of refrigerant carrying tubes aligned in generally parallel relationship in a plane normal to the direction of airflow therethrough and a plurality of fins connected in heat transfer relationship with respective tubes and being in generally parallel relationship in a plane normal to the direction of airflow therethrough;
• wherein said plurality of fins are spaced at a distance of at least 0.4 inches between adjacent fins.

A refrigerated merchandiser comprising:

• an enclosure having a front wall partially defining a refrigerated display cabinet and having an access opening in said front wall for providing access to the refrigerated display cabinet;
• an evaporator coil disposed in operative association with the refrigerated display cabinet;
• a compartment heat insulated from the refrigerated display cabinet;
• a condenser coil disposed within said compartment;
• a condenser fan disposed within said compartment for circulating air over said condenser coil;
• and
• a compressor disposed within said compartment and connected in refrigerant flow communication with said evaporator coil and said condenser coil for circulating refrigerant through said evaporator coil and said condenser coil;
• said condenser coil having at least one header for receiving refrigerant vapor from said compressor and having a plurality of microchannel tubes each with a plurality of longitudinally extending channels that are fluidly connected at their ends to receive refrigerant vapor now from said at least one header, said plurality of tubes having generally flat sides that are generally aligned with the direction of airflow thereover and with the spacing between adjacent tubes being at least 0.4 inches.

A refrigerated merchandiser comprising:

• an enclosure defining a refrigerated display cabinet and having an access opening for providing access to the refrigerated display cabinet;
• an evaporator coil disposed in operative association with the refrigerated display cabinet;
• a condenser coil disposed externally of the refrigerated display cabinet;
• a condenser fan disposed in operative association with said condenser coil for circulating air over said condenser coil;
• and
• a compressor connected in refrigerant flow communication with said evaporator coil and said condenser coil for circulating refrigerant through said evaporator coil and said condenser coil;
• said condenser coil having a plurality of refrigerant carrying tubes arranged in generally parallel relationship, said tubes having generally flat sides that are generally aligned with the direction of airflow thereover, and a plurality of fins connected in heat transfer relationship with respective tubes and being disposed in generally parallel relationship with said plurality of fins being spaced at a distance of at least 0.4 inches between adjacent fins.

A refrigerated merchandiser comprising:

• an enclosure defining a refrigerated display cabinet and having an access opening for providing access to the refrigerated display cabinet;
• an evaporator coil disposed in operative association with the refrigerated display cabinet;
• a condenser coil disposed externally of the refrigerated display cabinet;
• a condenser fan disposed in operative association with said condenser coil for circulating air over said condenser coil;
• and
• a compressor connected in refrigerant flow communication with said evaporator coil and said condenser coil for circulating refrigerant through said evaporator coil and said condenser coil;
• said condenser coil having a plurality of refrigerant carrying tubes arranged in generally parallel spaced relationship with said plurality of tubes being spaced at a distance of at least 0.4 inches between adjacent tubes, said tubes having generally flat sides that are generally aligned with the direction of airflow thereover.