A new report illustrates a concerning dynamic: Record heat last year pushed countries to use more planet-warming fossil fuels to cool things down. By Claire Brown Last year was the hottest on ...

Keywords engines, heat energy, steam engine, internal combustion, external combustion, reciprocating engine, four-stroke cycle, diesel engine, rotary engine, gas turbine, jet engine, rocket engine ...

In the proposed PTES design, supercritical CO 2 is utilized as a heat pump and a heat engine. A cycle compressor takes the carbon dioxide during the charging phase and raises its temperature and ...