Heat exchange device suitable for low pressure refrigerant

A method for using a heat exchange device, comprising:

• receiving a refrigerant vapor discharged from a compressor outlet port in a first cylinder of a first heat exchange unit via a first refrigerant inlet;
• condensing the refrigerant vapor into a refrigerant liquid after passing the refrigerant vapor over a first condenser tube bundle disposed in the first cylinder of the first heat exchange unit;
• directing the refrigerant liquid through a first refrigerant outlet of the first heat exchange unit into a connection conduit coupled to a second refrigerant inlet of a second heat exchange unit;
• receiving the refrigerant liquid in a second cylinder of the second heat exchange unit via the second refrigerant inlet;
• condensing the refrigerant liquid into a saturated refrigerant liquid after passing the refrigerant liquid over a second condenser tube bundle of the second heat exchange unit;
• directing the saturated refrigerant liquid through a refrigerant dispenser disposed within the second cylinder of the second heat exchange unit, such that the saturated refrigerant liquid becomes a two-phase refrigerant;
• and
• evaporating the two-phase refrigerant into the refrigerant vapor after passing the two-phase refrigerant over an evaporation tube bundle disposed in the second cylinder of the second heat exchange unit.

A heat exchange device, comprising:

• a first heat exchange unit comprising a first condenser tube bundle and a first impingement plate disposed within a first cylinder of the first heat exchange unit, wherein the first impingement plate is disposed in the first cylinder proximate to a first refrigerant inlet;
• and
• a second heat exchange unit comprising a liquid baffle, a refrigerant dispenser, a second impingement plate, a second condenser tube bundle, and an evaporation tube bundle disposed in a second cylinder of the second heat exchange unit, wherein a first refrigerant outlet of the first heat exchange unit is in fluid communication with a second refrigerant inlet of the second heat exchange unit through a throttling device, the liquid baffle extends along an axial direction of the second cylinder to form a piping chamber and a gas returning chamber, the refrigerant dispenser is disposed in the piping chamber, the refrigerant dispenser extends from the liquid baffle toward an inner surface of the second cylinder and extends along the axial direction of the second cylinder to form an upper portion and a lower portion of the piping chamber, the second condenser tube bundle is disposed in the upper portion of the piping chamber, the evaporation tube bundle is disposed in the lower portion of the piping chamber, and the second impingement plate is disposed in the second cylinder proximate to the second refrigerant inlet.