Combined condenser-evaporator

A combined condenser-evaporator comprising:

• a condensation channel configured to allow a flow of gas over a condensation surface of the condensation channel to condense;
• a first evaporation channel configured to allow a first liquid to flow over a first evaporation surface of the first evaporation channel and perform indirect heat exchange with the gas to at least partially evaporate the first liquid;
• a second evaporation channel configured to allow a second liquid to flow over a second evaporation surface of the second evaporation channel and perform indirect heat exchange with the gas to at least partially evaporate the second liquid flow;
• a heat exchanger core, the heat exchanger core configured to be submerged in a bottom liquid;
• said heat exchanger core comprising:
• the condensation channel and the first evaporation channel and the second evaporation channel, which are stacked and spaced apart, and
• a dividing plate, the dividing plate separating the heat exchanger core into a closed section and a semi-open section, the closed section comprising the condensation channel and the first evaporation channel, both the condensation channel and the first evaporation channel not being in communication with the bottom liquid;
• the semi-open section comprising the condensation channel and the second evaporation channel, the condensation channel not being in communication with the bottom liquid, the second evaporation channel being in communication with the bottom liquid, the bottom liquid undergoing circulating evaporation in the second evaporation channel;
• wherein the first liquid and the second liquid are different.