performance another optional feature that can be implemented in the tgt is a flow control valve 119 this valve can be controlled by a control system or manually without the valve the tgt will transfer heat from the hot air stream 105 to the cold air stream 107 the valve can be open and allow this heat to be transferred closed to stop the circulation of refrigerant and thus stop the heat transfer or somewhere in between to allow for a specific amount of heat to be transferred one application where flow control on the tgt is useful is on a heat recovery unit around an evaporator coil 121 of a vapor compression vc refrigeration cycle as shown in fig1 in this configuration the tgt condenser 101 both reheats the coil air leaving the vc evaporator 121 and uses that heat to cool the air entering 124 the vc evaporator 121 through the tgt evaporator 100 the tgt in this configuration can lower the sensible heat ratio shr of the vapor compression cycle which allows it to remove more latent heat humidity from the air relative to the total heat removed than without the heat recovery unit since the tgt can be implemented in a single loop the tgt control valve 119 can be used to regulate the amount of heat recovered the ability to control the amount of heat recovered enabling dynamic control of the shr in cases where dehumidification is more important than temperature control heat recovery can significantly reduce the amount of power consumed by the compressor 122 it can also lead to a lower condenser temperature.