The term cryogenics derives from the Greek kryos, for icy cold. The upper limit that characterizes the cryogenic region of the temperature scale is subjective. If the delimitation criterion takes into consideration practical reasons, then this upper limit can be established at a higher than usually declared value (120 K) in order to include natural gas fuel liquefaction. The cryogenics region of the temperature scale 0–120 K can be divided into sub regions according to the criteria of the cryogenic method and refrigerant (known as crycoolers) as follows: (more…)
The idea of using an absorption fluid as a refrigerant carrier derived from the drawback of VCR (vapor–compression refrigeration) s ...
Micro technology can be employed to produce miniaturized refrigeration and cryocooling systems. Although process intensificat ...
The issues of hydrogen storage run through the hydrogen production, hydrogen transport, supply and demand for end use of hydrog ...
n fabricating microscale energy systems, a number of operating conditions must first be taken into account. Foremost are the op ...
Many small-scale energy systems require effective miniaturized pumps and expanders. These devices are responsible for conveying ...
The idea of using an absorption fluid as a refrigerant carrier derived from the drawback of VCR (vapor–compression refrigeration) systems that the gas compression requires a high work input. A pump that requires practically no work to increase the pressure in the refrigeration system replaces the complicated and work-consuming compressor. There are two major advantages of absorption refrigeration systems (ARSs) compared with VCRs (vapor–compression refrigeration): No CFCs or HCFCs are used as refrigerants, and they use heat from different sources, such as combustion, industrial processes, waste heat (an economical solution for recovery), or solar heat. (more…)
Heat-actuated heat pumps are cooling systems requiring no electricity for operation. Rather, a heat source is used, avoiding the ne ...
The term cryogenics derives from the Greek kryos, for icy cold. The upper limit that characterizes the cryogenic region of the temp ...
Separation is a unit operation used in absorption heat pumps and chemical processing applications such as solvent extraction and pr ...
Active solar hot water systems water are usable with air, liquid, vapor or liquid collector fluid or gas to liquid process. Hot ...
Micro technology can be employed to produce miniaturized refrigeration and cryocooling systems. Although process intensificat ...
The total installed geothermal power generating capacity in the world is approximately 9000 MWe from 21 countries, with the United States leading at nearly 3000 MWe and The Philippines with nearly 2000 MWe (Table II). Other major countries are Italy, Mexico, Indonesia, Japan, and New Zealand, with between 400 and 800 MWe each. (more…)
In most countries, geothermal resources are classified as natural resources belonging to the government. Since the 1980s, there has ...
Geothermal wells need to undergo a test program before they are used. This is so that the baseline conditions of both the wells and ...
Several passive heating systems, if provided with proper ventilation, can ensure to provide cooling. Passive heating and cooling fo ...
Steam is a great heat transfer medium simply because it's easy to move inside your system. Steam heating is known to have a ver ...
Steam heating is an absolutely wonderful method to heat your home. Steam heat is always driven by steam produced from water in ...
n fabricating microscale energy systems, a number of operating conditions must first be taken into account. Foremost are the operating temperatures throughout the device. Often with mesoscale/ microscale energy systems, two closely spaced parts of the same device have a large temperature difference between them; hence, a large gradient can be present. A primary constraint is to have the material withstand the maximum temperatures existing in the system, but the gradients and thermal expansion must also be tolerated. (more…)
Silicon is the material of choice for most Micro Electro Mechanical Systems due to (1) the feature size often being in the rang ...
Extensive insulation repairs are usually done by contractors having the specific skills and equipment appropriate to the type o ...
Fuel cells are direct energy conversion devices that combine two reactants to produce electrical power. The reactants are typic ...
Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation ...
Insulation is what keeps the heat energy of a boiler system from leaking out of the system on its way to the end users. Inspect ...
The most fundamental process from an energy systems standpoint is heat transfer to (or from) a working fluid. This unit operation typically occurs in small channels, the characteristic diameter of which is less than 1 mm. Other heat transfer exchanger configurations, such as fluid flowing through a network of posts or through a mesh, are also possible. Specific examples of this fundamental unit operation include phase change occurring in boilers (modular steam boiler), evaporators, and condensers. (more…)
Mixing is a process where two or more liquids or gas phase components are brought together and combined to form a uniform compositi ...
Micro technology can be employed to produce miniaturized refrigeration and cryocooling systems. Although process intensificat ...
Separation is a unit operation used in absorption heat pumps and chemical processing applications such as solvent extraction and pr ...
Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation ...
Many small-scale energy systems require effective miniaturized pumps and expanders. These devices are responsible for conveying ...
Based on estimates of the U.S. Department of Energy, the energy used in homes accounts for 20% of all the energy consumption in the United States. The ability to control the indoor temperature is one of the most important achievements of modern technology. (more…)
Want state of the art LED lighting for your home? If so then this article will help to teach you about the many benefits to be gain ...
Take a look at the following energy saving ideas and new green products and see how many you can use to save your hard earned c ...
These days we have two main concerns in the world of business and finance. First the greenhouse global warming and second the finan ...
Nowadays, a lot more people are increasingly aware of the amount of energy they consumed everyday and what effect it was having ...
It is a reasonable and sensible action to tighten our belts and cut spending as living cost are climbing nowadays. We have to m ...
Active solar hot water systems water are usable with air, liquid, vapor or liquid collector fluid or gas to liquid process. Hot water production with an air-heating collector’s distribution for heating is usually performed in the large space heating panel systems. The losses in the process of heat transfer are high. Air systems work not as well as units of the liquid to heat the water. Air systems are generally only capable of hot water 70 to 95F. (more…)
Several passive heating systems, if provided with proper ventilation, can ensure to provide cooling. Passive heating and cooling fo ...
Solar water heating for swimming pool rank as the most successful but least heralded commercial solar application. The use of solar ...
Steam heating is an absolutely wonderful method to heat your home. Steam heat is always driven by steam produced from water in ...
From the turn of the century to 1911, more than a dozen inventors filed patents that improved on the Climax. However, none chan ...
Steam is a great heat transfer medium simply because it's easy to move inside your system. Steam heating is known to have a ver ...
Estimation of the future technical potential of biomass as an energy source is dependent on assumptions with respect to land availability and productivity as well as conversion technologies. With the emergence of energy crops as the major source of biomass fuel, land use conflicts, especially in relation to food production, may arise. However, with efficient agricultural practices, plantations and crops could supply a large proportion of energy needs, with residues playing a smaller role without compromising food production or further intensifying agricultural practices. (more…)
The future development of energy crops, to the level at which they would replace residues as the major bioenergy fuel source, will ...
Bioenergy produced from biomass is sometimes called a carbon-neutral energy source, because the same quantity of carbon released wh ...
The quantification of the actual reduction in green house gases sourcess emissions resulting from the substitution of fossil fu ...
To date, most discussion and research relating to the various of biomass role in mitigating CO2 emissions has been focused around i ...
Over the last decade, the number of countries researching the potential of biomass and bioenergy for energy services rose rapid ...
As a result of high and rising costs of fossil fuels and fossil fuels affect global environment concern , and by the reduction of greenhouse effect gases from burning causes (Kyoto Protocol), the heat recovery gain importance growing. A heat exchanger absorbs a significant portion of the heat energy of the gases generated during combustion of solid fuel, liquid and gas in the smelting process, heating, roasting, and drying. (more…)
In these regenerators the heat energy transfer between primary and secondary fluid is primarily by radiation and its installati ...
Heat has a enormous influence in our daily lives. Heat quantity exposed in our live has related to the foods we eat, the temper ...
The product gas can be burned in boilers to generate heat and raise steam, in internal combustion engines to generate electricity a ...
The leading automotive brands are being focused to produce electric vehicles because they believe they represent a harmony to the e ...
Drying is one of the most important post harvest steps. It enhances the storage life of the crop products, minimizes losses during ...
Micro technology can be employed to produce miniaturized refrigeration and cryocooling systems. Although process intensification is typically the route used for miniaturization, micro technology can also be used for reducing the size of mechanical components that are necessary for operation. For example, to create a small-scale vapor compression refrigerator, (more…)
Many small-scale energy systems require effective miniaturized pumps and expanders. These devices are responsible for conveying ...
The most fundamental process from an energy systems standpoint is heat transfer to (or from) a working fluid. This unit operation t ...
Many characteristics of traditional engines make them attractive for use in power generation and propulsion technology. They tend t ...
Heat-actuated heat pumps are cooling systems requiring no electricity for operation. Rather, a heat source is used, avoiding the ne ...
Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation ...