The second law of thermodynamics say that we could harness thermal energy only if there is temperature difference between a two bodies. Will it work if we have a forcible heat rejection from one body to another? Difference of temperatures between the oceans and the outer space is around 300 K. Let say we take a liter of water (300 K) and cool it down quite a much by forcing all the heat to be emitted as infrared radiation through athmosphere transparency window to the outer space. We could spend one kilowatt of energy to reject a few kilowatts of heat. And then we will have temp. difference between cooled and non-cooled water. Could we gain some energy in total using a process of that kind?