How can you transfer cold into energy using latent heat as in refrigeration only in reverse?
You can’t actually transfer “cold into energy”, but you can take advantage of a new cold heat sink to extract work from low level heat where none could be extracted before. But basically, you are just talking about a power recovery system, where work is extracted by transferring heat from source to sink. A refrigeration system locally cools an environment by the input of work. Compress (via work) and condense (extract heat) the refrigerant in the condensing coils, then let down the pressure before entering the cooling coils so it vaporizes and absorbs heat at a low temperature. If you skip the letdown in pressure, you can input heat in the cooling coils at a higher temperature to vaporize the liquid. Then, you can extract work from the compressor (now expander) by flowing across it with pressure drop. You then need to condense the vapor at a lower pressure (using “cold” air). Finally, a new pump is required to press up the liquid before returning to the cooling coil. Extracted work fro
