EDITORS—At the close of an article upon heat and cold in your ... The water in these pumps, it seems, is not compressed, but is driven at a high velocity. If the air in the water is not ...

If you aren’t familiar with heat pumps ... (high efficiency). A unit with a high SEER number uses less electricity, but has ...

Researchers in Italy have designed a novel carbon dioxide heat pump that can work with photovoltaic-thermal energy, a finned coil heat exchanger and a U-tube borehole heat exchanger. Their experiment ...