Ostensibly, heat pumps could dual-purpose as AC and dehumidification, but if you have enough water for a heat pump, the condensation you collect probably isn't going to be very significant.
Edit: My point being you don't have to supply 2MJ of energy, you need to move it. That can be done for less.
My point being you don't have to supply 2MJ of energy, you need to move it. That can be done for less.
Understood, but the point is still that you need to keep something cold enough for vapor to condense, while the condensation of 1 kg of water is dissipating enough heat to bring 5.4 kg of water from 0 to 100C. Even if just moving the heat around, there's just too much of it.
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Ostensibly, heat pumps could dual-purpose as AC and dehumidification, but if you have enough water for a heat pump, the condensation you collect probably isn't going to be very significant.
Edit: My point being you don't have to supply 2MJ of energy, you need to move it. That can be done for less.
Understood, but the point is still that you need to keep something cold enough for vapor to condense, while the condensation of 1 kg of water is dissipating enough heat to bring 5.4 kg of water from 0 to 100C. Even if just moving the heat around, there's just too much of it.