Air conditioning system for dehumidifying and cooling air

A method of dehumidifying and cooling air from an interior space defined by a structure with a dual path air conditioning system, the system comprising:

• a housing defining a chamber, the housing further defining an outside air inlet, a return air inlet, and an outlet;
• a cooling coil located in the chamber;
• said housing defining a first airflow path therein communicating between said outside air inlet over said coil and said outlet, said system further defining a second airflow path between said return air inlet over said coil and to said outlet;
• said housing further defining a third airflow path between said return air inlet and said outlet;
• a sensor located in said interior space;
• an outside air damper sequentially moveable between an open position directing outside air to flow through said first airflow path and a closed position where the outside air inlet is closed;
• a return air damper sequentially moveable between an open position permitting return air to flow through said second airflow path, and a closed position where the return air is prevented from flowing through said second airflow path and over said coil;
• a bypass air damper sequentially moveable between a closed position directing return air to flow to said second airflow path, and an open position where the return air flows through both the second and third airflow paths;
• and
• a controller configured to independently control opening and closing of the outside air damper, the return air damper and the bypass damper through intermediate positions between the open and closed positions, the controller in communication with the sensor;
• the method comprising:
• the outside air inlet receiving outside air into said first airflow path, the first airflow path delivering the outside air over said coil to said outlet;
• the return air inlet receiving return air into said second airflow path, the second airflow path delivering the return air over said coil to said outlet;
• the return air inlet receiving return air into said third airflow path, the third airflow path delivering the return air through said chamber to said outlet without passing over said coil;
• the outlet delivering air from the chamber to said interior space;
• the sensor measuring a humidity level in said interior space and communicating the humidity level measurement to the controller wherein humidity level is used in conjunction with a temperature measurement to calculate dew point;
• the controller independently controlling the opening and closing of the outside air damper, the return air damper, and the bypass air damper to independently position each of the outside air damper, the return air damper, and the bypass air damper at a selected number of intermediate positions between open and closed positions in response to the calculated dew point.