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Central Heating
A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces. A central heating system has a furnace that converts fuel or electricity to heat. The heat is circulated through the building either by fans forcing heated air through ducts, circulation of low-pressure steam to radiators in each heated room, or pumps that circulate hot water through room radiators. Primary energy sources may be fuels like coal or wood, oil, kerosene, natural gas, or electricity. Compared with systems such as fireplaces and wood stoves, a central heating plant offers improved uniformity of temperature control over a building, usually including automatic control of the furnace. Large homes or buildings may be divided into individually controllable zones with their own temperature controls. Automatic fuel (and sometimes ash ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viessmann Vitodens 200
The Viessmann Group is a German manufacturer of heating and refrigeration systems headquartered in Allendorf (Eder), Germany. With 22 production companies in 12 countries, distribution companies and representative offices in 74 countries and 120 sales offices throughout the world, Viessmann is international in its orientation. More than 54 percent of turnover is generated abroad. Since January 2022, the company is led by Martin Vießmann (Chairman of the Executive Board), Maximilian Viessmann (Group-CEO) and Ulrich Hüllmann (CFO). The company was founded in Hof an der Saale in 1917 by Johann Viessmann, and has been family owned for four generations. As of 2021, the company employs 13,000 people and reports annual sales of € 3.4 billion. Profile With 22 production companies in 12 countries and worldwide with sales companies, agencies and trade partners in 74 countries, Viessmann is internationally oriented. More than 54 percent of turnover is generated abroad. Since Ja ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Generations Of District Heating Systems EN
A generation is "all of the people born and living at about the same time, regarded collectively." Generation or generations may also refer to: Science and technology * Generation (particle physics), a division of the elementary particles * Generation in carrier generation and recombination, a process with mobile charge carriers (semiconductors) * Generation in biology, a (usually multicellular) life stage, see biological life cycle * Electricity generation * Programming language generations, classes of a programming style's power Books * ''Generations'' (Marvel Comics), a Marvel Comics series * '' Superman & Batman: Generations'', a DC Comics series * ''Generations'' (book), a 1991 analysis of Anglo-American history by William Strauss and Neil Howe *'' GENERATION: 25 Years of Contemporary Art in Scotland'', a series of visual arts projects, exhibitions and events * ''Generations'' (DC Comics), a limited series from DC Comics *'' The Generation: The Rise and Fall of the Jewish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamgyeongbuk-do
"North Hamgyeong Province" or "''Hamgyeongbuk-do''" () is, according to South Korean law, a province of the Republic of Korea, as the South Korean government formally claims to be the legitimate government of whole of Korea. The area constituting the province is under the ''de facto'' jurisdiction of North Korea. As South Korea does not recognize changes in administrative divisions made by North Korea, official maps of the South Korean government shows North Hamgyeong Province in its pre-1945 borders. The area corresponds to North Korea's North Hamgyong Province, Rason Special City and part of Ryanggang Province. To symbolize its claims, the South Korean government established the Committee for the Five Northern Korean Provinces as an administrative body for the five northern provinces. A governor for North Hamgyeong Province is appointed by the President of South Korea. Administrative divisions Hamgyeongbuk-do is divided into 3 cities (''si'') and 11 counties (''gun''). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unggi
Sonbong County, formerly called Unggi (Chosŏn'gŭl: 웅기, Hancha: 雄基), is a subdivision of the North Korean city of Rason. It is located at the northeastern extreme of North Korea, bordering Russia and China. It lies on Unggi Bay, an extension of the Sea of Japan (East Sea of Korea). A uranium mine is allegedly located there, as is a 200 megawatt oil-fired power plant. The word Sonbong means "Vanguard" in Korean. The Sonbong Revolutionary Site there is dedicated to a visit by Kim Jong-suk in November 1945 "upholding the policy of building a new country advanced by President Kim Il Sung" after the liberation of Korea. It includes the Sonbong Revolutionary Museum, a monument to the historic site, and the house where she stayed. Administrative divisions Sonbong County is divided into 1 town ("Ŭp"), 2 worker's districts ("Rodongjagu") and 10 villages ("Ri"): * Sŏnbong-ŭp (선봉읍/先鋒邑) * Tuman'gang-rodongjagu (두만강로동자구/豆滿江勞動者區) * Ungsang- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolithic Age
The Neolithic period, or New Stone Age, is an Old World archaeological period and the final division of the Stone Age. It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts of the world. This "Neolithic package" included the introduction of farming, domestication of animals, and change from a hunter-gatherer lifestyle to one of settlement. It began about 12,000 years ago when farming appeared in the Epipalaeolithic Near East, and later in other parts of the world. The Neolithic lasted in the Near East until the transitional period of the Chalcolithic (Copper Age) from about 6,500 years ago (4500 BC), marked by the development of metallurgy, leading up to the Bronze Age and Iron Age. In other places the Neolithic followed the Mesolithic (Middle Stone Age) and then lasted until later. In Ancient Egypt, the Neolithic lasted until the Protodynastic period, 3150 BC.Karin Sowada and Peter Grave. Egypt in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ondol
Ondol (; , Hangul: 온돌, 溫堗, ) or gudeul (Hangul: 구들, ) in Korean traditional architecture, is underfloor heating that uses direct heat transfer from wood smoke to heat the underside of a thick masonry floor. In modern usage it refers to any type of underfloor heating, or to a hotel or a sleeping room in Korean (as opposed to Western) style. The main components of the traditional ''ondol'' are an ''agungi'' (firebox or stove) accessible from an adjoining room (typically kitchen or master bedroom), a raised masonry floor underlain by horizontal smoke passages, and a vertical, freestanding chimney on the opposite exterior wall providing a draft. The heated floor, supported by stone piers or baffles to distribute the smoke, is covered by stone slabs, clay and an impervious layer such as oiled paper. History Origin Use of the ''ondol'' has been found at archaeological sites in present-day North Korea. A Neolithic Age archaeological site, circa 5000 BC, discovered in Unggi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ondol
Ondol (; , Hangul: 온돌, 溫堗, ) or gudeul (Hangul: 구들, ) in Korean traditional architecture, is underfloor heating that uses direct heat transfer from wood smoke to heat the underside of a thick masonry floor. In modern usage it refers to any type of underfloor heating, or to a hotel or a sleeping room in Korean (as opposed to Western) style. The main components of the traditional ''ondol'' are an ''agungi'' (firebox or stove) accessible from an adjoining room (typically kitchen or master bedroom), a raised masonry floor underlain by horizontal smoke passages, and a vertical, freestanding chimney on the opposite exterior wall providing a draft. The heated floor, supported by stone piers or baffles to distribute the smoke, is covered by stone slabs, clay and an impervious layer such as oiled paper. History Origin Use of the ''ondol'' has been found at archaeological sites in present-day North Korea. A Neolithic Age archaeological site, circa 5000 BC, discovered in Unggi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cogeneration
Cogeneration or combined heat and power (CHP) is the use of a heat engine or power station to generate electricity and useful heat at the same time. Cogeneration is a more efficient use of fuel or heat, because otherwise- wasted heat from electricity generation is put to some productive use. Combined heat and power (CHP) plants recover otherwise wasted thermal energy for heating. This is also called combined heat and power district heating. Small CHP plants are an example of decentralized energy. By-product heat at moderate temperatures (100–180 °C, 212–356 °F) can also be used in absorption refrigerators for cooling. The supply of high-temperature heat first drives a gas or steam turbine-powered generator. The resulting low-temperature waste heat is then used for water or space heating. At smaller scales (typically below 1 MW), a gas engine or diesel engine may be used. Cogeneration is also common with geothermal power plants as they often produce relatively lo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waste Heat
Waste heat is heat that is produced by a machine, or other process that uses energy, as a byproduct of doing work. All such processes give off some waste heat as a fundamental result of the laws of thermodynamics. Waste heat has lower utility (or in thermodynamics lexicon a lower exergy or higher entropy) than the original energy source. Sources of waste heat include all manner of human activities, natural systems, and all organisms, for example, incandescent light bulbs get hot, a refrigerator warms the room air, a building gets hot during peak hours, an internal combustion engine generates high-temperature exhaust gases, and electronic components get warm when in operation. Instead of being "wasted" by release into the ambient environment, sometimes waste heat (or cold) can be used by another process (such as using hot engine coolant to heat a vehicle), or a portion of heat that would otherwise be wasted can be reused in the same process if make-up heat is added to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
District Heating
District heating (also known as heat networks or teleheating) is a system for distributing heat generated in a centralized location through a system of insulated pipes for residential and commercial heating requirements such as space heating and water heating. The heat is often obtained from a cogeneration plant burning fossil fuels or biomass, but heat-only boiler stations, geothermal heating, heat pumps and central solar heating are also used, as well as heat waste from factories and nuclear power electricity generation. District heating plants can provide higher efficiencies and better pollution control than localized boilers. According to some research, district heating with combined heat and power (CHPDH) is the cheapest method of cutting carbon emissions, and has one of the lowest carbon footprints of all fossil generation plants. Fifth-generation district heat networks do not use combustion on-site and have zero emissions of CO and NO on-site; they employ heat transfer u ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gas Heater
A gas heater is a space heater used to heat a room or outdoor area by burning natural gas, liquefied petroleum gas, propane or butane. Indoor household gas heaters can be broadly categorized in one of two ways: ''flued'' or ''non-flued,'' or ''vented'' and ''unvented''. History The first gas heater made use of the same principles of the Bunsen burner invented in the previous year. It was first commercialized by the English company ''Pettit and Smith'' in 1856. The flame heats the air locally. This heated air then spreads by convection, thus heating the whole room. Today the same principle applies with outdoor patio heaters or "mushroom heaters" which act as giant Bunsen burners. Beginning in 1881, the burner's flame was used to heat a structure made of asbestos, a design patented by Sigismund Leoni, a British engineer. Later, fire clay replaced the asbestos because it is easier to mould. Modern gas heaters still work this way although using other refractory material. M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Solar Heating
Central solar heating is the provision of central heating and hot water from solar energy by a system in which the water is heated centrally by arrays of solar thermal collectors (central solar heating plants - CSHPs) and distributed through district heating pipe networks (or 'block heating' systems in the case of smaller installations). For block systems, the solar collectors are typically mounted on the building roof tops. For district heating systems the collectors may instead be installed on the ground. Central solar heating can involve large-scale thermal storage, scaling from diurnal storage to seasonal thermal energy storage (STES). Thermal storage increase the solar fraction - the ratio between solar energy gain to the total energy demand in the system - for solar thermal systems. Ideally, the aim for applying seasonal storage is to store solar energy collected in the summer time to the winter month. Compared to small solar heating systems (solar combisystems), central s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
