Patent ID: 8763681

Claim:
Evaporator for a cooling circuit for cooling at least one heat emitting device by evaporation of a cooling fluid, said evaporator comprising: a top collector having a volume for receiving the cooling fluid therein; a bottom collector having a volume for receiving the cooling fluid therein; an evaporator body, comprising, at least one thermoconducting wall that is thermally connectable to the at least one heat emitting device; a plurality of evaporation channels being in thermal contact with the at least one thermoconducting wall and being fluidly connected to the bottom collector and to the top collector, each of the evaporation channels comprising a respective evaporation channel intake for intaking cooling fluid from the bottom collector in an operating state of the evaporator, and a respective evaporation channel outlet for letting out the cooling fluid to the top collector in the operating state, the evaporation channels being dimensioned for establishing boiling of the liquid cooling fluid in the evaporation channels in the operating state, so that in the operating state the cooling fluid therein is at least partially turned into vapor, and for establishing bubble pumping so that the cooling fluid is then driven out from the evaporation channels via the respective evaporation channel outlets to the top collector; a plurality of return channels fluidly connected to the bottom collector and to the top collector, each of the return channels comprising a respective return channel intake for intake of the cooling fluid from the top collector in the operating state, and a respective return channel outlet for letting out the cooling fluid to the bottom collector in the operating state; a liquid outlet port at the bottom collector for connection to a condenser of the cooling circuit for letting in cooling fluid directly from the condenser to the bottom collector in an operating state of the evaporator; and a vapor outlet port connectable to a condenser of the cooling circuit for letting out cooling fluid from the top collector towards the condenser in the operating state, wherein the top collector has a separation volume for separating, in the operating state, a predominantly liquid portion from a predominantly vaporous portion of the cooling fluid therein, and the vapor outlet port of the evaporator is arranged for letting the predominantly vaporous portion of the cooling fluid out of the top collector, and wherein the return channel intakes are arranged for taking in the predominantly liquid portion of the cooling fluid from the top collector, the vapor outlet port is an end portion of an outer connector tube of the evaporator, the liquid outlet port forms the end portion of an inner connector tube of the evaporator, and the outer connector tube is arranged about coaxially around the inner connector tube.