Circulation device for two-phase cooling system and refrigerant circulation method in circulation device for two-phase cooling system

A circulation device for a two-phase cooling system, the circulation device that constitutes the two-phase cooling system in which a refrigerant is circulated by connecting a removable evaporator to the circulation device, the circulation device comprising:

• a pump to pump the refrigerant;
• an inlet connection downstream of the pump connected to an inlet of the evaporator for the refrigerant, and an outlet connection downstream of the pump connected to an outlet of the evaporator for the refrigerant;
• a condenser downstream of the outlet connection to cool the refrigerant;
• and
• a bypass line branching at a portion downstream of the pump and upstream of the inlet connection to allow the refrigerant to flow to the condenser without passing through the inlet connection and the outlet connection;
• wherein
• the circulation device is operable to circulate the refrigerant not through the inlet connection and the outlet connection but through the bypass line when at least the evaporator is not connected to the inlet connection and the outlet connection.