Serial superheat control for a dehumidification system

A dehumidification system comprising:

• a primary metering device;
• a secondary metering device;
• a superheat control evaporator operable to:
• receive a flow of refrigerant from a primary evaporator;
• and
• receive an inlet airflow and output a first airflow, the first airflow comprising cooler air than the inlet airflow, the first airflow generated by transferring heat from the inlet airflow to the flow of refrigerant as the inlet airflow passes through the superheat control evaporator;
• a secondary evaporator, disposed in series with the superheat control evaporator with reference to airflow in the dehumidification system, operable to:
• receive the flow of refrigerant from the primary metering device;
• and
• receive the first airflow and output a second airflow, the second airflow comprising cooler air than the first airflow, the second airflow generated by transferring heat from the first airflow to the flow of refrigerant as the first airflow passes through the secondary evaporator;
• a primary evaporator operable to:
• receive the flow of refrigerant from a first modulating valve and/or a secondary condenser;
• and
• receive the second airflow and output a third airflow, the third airflow comprising cooler air than the second airflow, the third airflow generated by transferring heat from the second airflow to the flow of refrigerant as the second airflow passes through the primary evaporator;
• the secondary condenser operable to:
• receive the flow of refrigerant from the first modulating valve;
• and
• receive the third airflow and output a fourth airflow;
• the first modulating valve operable to:
• receive the flow of refrigerant from the secondary evaporator;
• direct the flow of refrigerant to the secondary condenser during a first mode of operation;
• direct the flow of refrigerant to the primary evaporator during a second mode of operation, wherein the flow of refrigerant bypasses the secondary condenser;
• and
• direct a portion of the flow of refrigerant to the secondary condenser and a remaining portion of the flow of refrigerant to the primary evaporator during a third mode of operation;
• a compressor configured to:
• receive the flow of refrigerant from the superheat control evaporator and discharge the flow of refrigerant at a higher pressure than the flow of refrigerant received at the compressor;
• and
• a primary condenser operable to:
• receive the flow of refrigerant discharged from the compressor;
• in response to receiving the flow of refrigerant from the compressor, output a dischargeable airflow in conjunction with a fan.