Evaporator

An evaporator, comprising:

• a housing with a refrigerant inlet and a refrigerant outlet;
• heat transfer tubes contained in the housing, in which chilled water for heat exchange with refrigerant inside of the housing flows;
• at least one distribution tray that is placed apart from the heat transfer tubes and includes a plurality of holes that distribute refrigerant over the heat transfer tubes;
• and
• at least one tube support having a plurality of holes through which the heat transfer tubes pass, placed inside of the housing, and that supports the at least one distribution tray, wherein the at least one distribution tray comprises a first distribution tray that is supported by a top of the at least one tube support, that is spaced upward from the heat transfer tubes, and that distributes refrigerant over the heat transfer tubes, wherein the at least one tube support comprises upper guides that protrude laterally from the top of the at least one tube support, respectively, form a space into which the first distribution tray is guided, and support the first distribution tray, and lateral rods that extend lengthways in a lengthwise direction of the first distribution tray and are attached to sidewalls of the first distribution tray and supported by the upper guides.