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Hypocaust under the floor in a Roman villa in Vieux-la-Romaine, near Caen, France. A hypocaust (Latin: hypocaustum) is a system of central heating in a building that produces and circulates hot air below the floor of a room, and may also warm the walls with a series of pipes through which the hot air passes.
Pont du Gard (1st century AD), over the Gardon in southern France, is one of the masterpieces of Roman technology. Ancient Roman technology is the collection of techniques, skills, methods, processes, and engineering practices which supported Roman civilization and made possible the expansion of the economy and military of ancient Rome (753 BC – 476 AD).
Electric heating or resistance heating converts electricity directly to heat. Electric heat is often more expensive than heat produced by combustion appliances like natural gas, propane, and oil. Electric resistance heat can be provided by baseboard heaters, space heaters, radiant heaters, furnaces, wall heaters, or thermal storage systems.
The pipes would channel the warm air into floor or wall vents inside the home. This method of heating worked because warm air rises. The system was simple, had few controls, a single automatic gas valve, and no blower. These furnaces could be made to work with any fuel simply by adapting the burner area.
The first furnace was accidentally discovered in 2000 during some excavations for some future building works planned on the spot. [2] After stopping these works, the Faculty of Conservation for Cultural heritage of University of Bologna (seat of Ravenna), the Sicilian Regional Department for Cultural heritage and the Fine Arts Department (Soprintendenza dei Beni Culturali) of Trapani [3 ...
Blast furnace: Although cast iron tools and weapons have been found in China dating from the 5th century BC, the earliest discovered Chinese blast furnaces, which produced pig iron that could be remelted and refined as cast iron in the cupola furnace, date from the 3rd and 2nd centuries BC, and the vast majority of early blast-furnace sites ...
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