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Topic Review
Heat-to-Gas Renewable Routes
Innovative renewable routes are potentially able to sustain the transition to a decarbonized energy economy. Green synthetic fuels, including hydrogen and natural gas, are considered viable alternatives to fossil fuels. Indeed, they play a fundamental role in those sectors that are difficult to electrify (e.g., road mobility or high-heat industrial processes), are capable of mitigating problems related to flexibility and instantaneous balance of the electric grid, are suitable for large-size and long-term storage and can be transported through the gas network.
  • 507
  • 23 Sep 2021
Topic Review
Heatable Glass
Electrically heatable glass and windows are relatively new products, which help solve problems in the design of buildings and vehicles. The idea of heating glass is based on the use of energy-efficient low-emissive glass, which is generally simple silicate glass with a special metallic oxides coating. Low-emissive coating decreases heat loss by approximately 30%. Heatable glass can be used in all kinds of standard glazing systems, whether wood, plastic, aluminum or steel. Heatable glass based on low-emissive coatings was first produced in high volume in the early 1980s. Today, heating glass is used in the construction of many kinds of buildings and in mass production of vehicles, ships and trains. Heatable glass removes discomfort and other disadvantages induced by the low heat-insulating features of silicate glass. The effect of “cold glass” disappears when the surface of the glass is heated. Condensation is eliminated, along with ice and snow covering, the window’s heat losses are compensated and room comfort is improved. Heatable glass can be used as the principal system of heating and can be combined with floor and ceiling heating. Such combination helps reduce the total rate of heat loss of the building, thereby lowering heating expenses. Also, the active area of the room can be used more efficiently, as massive window-sill radiators are not needed. Initially, heating glass was produced by sputtering ordinary glass, and stable quality could not be guaranteed. A technological breakthrough took place in 1989 when the mass production of low-emissive glass began. The glass was coated during the manufacturing process.
  • 301
  • 18 Oct 2022
Topic Review
Heating, Ventilation, and Air Conditioning System
The heating, ventilation, and air conditioning (HVAC) system is a major energy consumer in office buildings, and its operation is critical for indoor thermal comfort.
  • 801
  • 24 Jun 2022
Topic Review
Heaviest Trains
The heaviest trains in the world are freight trains hauling bulk commodities such as coal and iron ore. The weight of trains generally does not include the weight of the operating locomotives; this is not considered dead weight, so is not included. If for example a train had two locomotives operating and was simply hauling a third off line, this third locomotive would be included in the payload weight.
  • 4.2K
  • 01 Nov 2022
Topic Review
Heaviside Condition
The Heaviside condition, named for Oliver Heaviside (1850–1925), is the condition an electrical transmission line must meet in order for there to be no distortion of a transmitted signal. Also known as the distortionless condition, it can be used to improve the performance of a transmission line by adding loading to the cable.
  • 786
  • 22 Nov 2022
Topic Review
Heavy metals removal from contaminated solution using seaweed
Heavy metal contamination affects lives with concomitant environmental pollution, and seaweed has emerged as a remedy with the ability to save the ecosystem, due to its eco-friendliness, affordability, availability, and effective metal ion removal rate. Heavy metals are intrinsic toxicants that are known to induce damage to multiple organs, especially when subjected to excess exposure. With respect to these growing concerns, this review presents the preferred sorption material among the many natural sorption materials. The use of seaweeds to treat contaminated solutions has demonstrated outstanding results when compared to other materials. The sorption of metal ions using dead seaweed biomass offers a comparative advantage over other natural sorption materials. This article summarizes the impact of heavy metals on the environment, and why dead seaweed biomass is regarded as the leading remediation material among the available materials. 
  • 1.5K
  • 24 Nov 2021
Topic Review
Heavy-Duty Vehicle Powertrain Technologies
Battery electric heavy-duty diesel vehicles (HDVs) and hydrogen fuel cell HDVs are two available alternatives to diesel engines. Each diesel engine HDV, battery-electric HDV, and hydrogen fuel cell HDV powertrain has its own advantages and disadvantages. 
  • 2.6K
  • 17 Jun 2021
Topic Review
Heavy-Metal Contaminated Input along Liquid Biofuel Value Chains
The main types of contaminants include inorganic (mostly heavy metals—HMs) and organic pollutants (petroleum, pesticides, polycyclic aromatic hydrocarbons—PAHs, etc.). The presence of contamination in the value chains examined is assessed in order to identify the corresponding effects and implications. Their effect is studied in each of the typical stages of the existing value chains, including pre-processing, conversion and post-processing steps. Special focus is assigned to the gasification and pyrolysis conversion processes, reviewing the fate of contaminants along each process. In the gasification process, parameters such as temperature, pressure, HM type and concentration are evaluated. At the same time, in pyrolysis, the major parameters considered were residence time and reactor temperature.
  • 309
  • 08 Oct 2022
Topic Review
Heckler & Koch HK69A1
The HK69A1 is a 40 mm grenade launcher developed and produced by the German arms manufacturer Heckler & Koch (H&K). The weapon was designed to engage enemy troops and strongpoints out to a distance of 350 m; it can also be used to deploy smoke grenades and illumination flares.
  • 841
  • 05 Nov 2022
Topic Review
Heinkel He 70
The Heinkel He 70 was a mail plane and fast passenger aircraft of the 1930s designed by Germany aeronautics firm Heinkel Flugzeugwerke, which was also used in auxiliary bomber and aerial reconnaissance roles. It had a relatively brief commercial career before it was replaced by types which could carry more passengers. The He 70 was a leading design for its day, setting eight world speed records by the beginning of 1933.
  • 1.5K
  • 21 Oct 2022
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