One of the most basic laws of thermodynamics, referred to as the second law, is that heat will spontaneously travel from a warm body to a cooler body, but not the reverse. Consequently, it is impossible for a system to indefinitely transfer heat from a...

A method of heating buildings and residences in which direct combustion of fossil fuel is not involved. Heat is absorbed from the surroundings or from waste liquid or gas streams. Refrigerant is evaporated by the external heat and vapor is heated. Heat...

The first electric welding transformer, a device which uses electricity to weld joints of metal using resistance heating. A heat...

A heat pump is a machine or device that moves heat from one location (the 'source') to another location (the 'sink' or 'heat sink'), using work. Most heat pump technology moves heat from a low temperature heat source to a higher temperature heat...

Heat pumps are used in four different ways to provide all or part of the heating and/or cooling of buildings by providing: (1) space and/or water heating, (2) both space heating and cooling, (3) space heating and cooling, water heating and occasionally exhaust air...

Heat pumps are thermomechanical systems that extract thermal energy from a low-temperature source and deliver it to a higher-temperature sink, at the expense of an energy input. Heat pumps are versatile because they can serve as high-efficiency heaters if the purpose is to...

The government for decades has failed to meet legal deadlines for tougher energy efficiency standards for appliances and other equipment, costing consumers and industry tens of billions of dollars in electric costs, a congressional study said Thursday.The Government Accountability Office reported that over several decades...

The question goes something like this: How many toilet flushes does it take to power a light bulb? There's really no answer, but Salt Lake City is exploring a pilot project that would convert sewer waste into energy to run a heating...