Method and apparatus for dehumidification

An HVAC system comprising:

• a compressor, a condenser and an evaporator arrangement connected in a closed refrigerant loop, the evaporator arrangement including a plurality of refrigerant circuits;
• the evaporator arrangement including at least one distribution arrangement configured to distribute and deliver refrigerant to each circuit of the plurality of circuits;
• the plurality of circuits being arranged into a plurality of sets of circuits;
• and
• the evaporator arrangement including a valve arrangement configured and disposed to isolate at least one of the sets of circuits from refrigerant flow from the condenser and to permit flow of refrigerant from the compressor to the at least one of the sets of circuits in a dehumidification operation of the HVAC system.

A method for dehumidification comprising the steps of:

• providing an HVAC system having a compressor, a condenser and an evaporator arrangement, including a first and second set of refrigerant circuits, connected in a closed refrigerant loop;
• determining an operational mode for the HVAC sysytem, the operational mode being a selected from the group consisting of cooling and dehumidification;
• isolating the first set of circuits from flow of refrigerant from the condenser when the operational mode is dehumidification;
• providing flow of refrigerant from the compressor to the first set of circuits when the operational mode is dehumidification;
• flowing heat transfer fluid over the evaporator arrangement, the heat transfer fluid being in a heat exchange relationship with the evaporator arrangement;
• and
• dehumidifying the heat transfer fluid without overcooling by entering into a heat exchange relationship with refrigerant flowing through both the first set of circuits and the second set of circuits, when the operational mode is dehumidification.