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 ...
You must perform some sort of tour and visit of your home and property to find out exactly where it may need in applying insulation. A good rule of thumb is that most heated area or perhaps cooled places needs to be split up from unconditioned places using insulation materials. Regardless of your properties design, you can use this rule to ascertain exactly where insulation installation should be set up. Every location will have its consideration in terms of insulation simplicity and cost-effectiveness and may be examined on the basis of both. (more…)
If your house has no attic (most flat-roof houses don’t), chances are there’s a cockloft, a space between roof and ceiling, at ...
Imprinted on every batt or blanket of insulation or on every bag of loose insulation is its R-Value. The higher Insulation R-Value, ...
You know where to insulate, but there’s still one more thing you need to know about—vapor barriers. Well-insulated attics, craw ...
Using blankets the width of your wall studs, insert the blanket between the studs and staple to the studs. (The job is easier i ...
It is easier and less costly to fit insulation in a new home than to retrofit. However, many existing houses have little or no insu ...
There are many efforts to make building more comfortable and to reduce the carbon dioxide emissions from buildings. For many years we tried to increase wall thickness of the wall insulation and roof insulation and adding the bottom insulation.
This seems logical, but I recently attended a seminar in where a speaker tried to make a comparison of as opposed to two major areas of new construction. These building were build year apart and built insulation levels in the store later far exceeded the first branch. Although the shops were of similar size, has a similar level of glass and skylights, the shop recently built, although it improved R-values (please refer to insulation R-Value chart), 43% costs warmer than the last. (more…)
It is easier and less costly to fit insulation in a new home than to retrofit. However, many existing houses have little or no insu ...
Imprinted on every batt or blanket of insulation or on every bag of loose insulation is its R-Value. The higher Insulation R-Value, ...
You must perform some sort of tour and visit of your home and property to find out exactly where it may need in applying insulation ...
If your house has no attic (most flat-roof houses don’t), chances are there’s a cockloft, a space between roof and ceiling, at ...
You know where to insulate, but there’s still one more thing you need to know about—vapor barriers. Well-insulated attics, craw ...
It is easier and less costly to fit insulation in a new home than to retrofit. However, many existing houses have little or no insulation, and they will benefit from any improvements that can be made to the levels of insulation. In most houses, insulation can be reasonably easily added to roof spaces and under timber framed floors. It is more difficult to retrofit insulation to walls. It is advisable to add insulation during any renovation, and it can also be cost effective – especially in colder parts of the country – to remove internal linings in order to add wall insulation. (more…)
You must perform some sort of tour and visit of your home and property to find out exactly where it may need in applying insulation ...
Imprinted on every batt or blanket of insulation or on every bag of loose insulation is its R-Value. The higher Insulation R-Value, ...
If your house has no attic (most flat-roof houses don’t), chances are there’s a cockloft, a space between roof and ceiling, at ...
You know where to insulate, but there’s still one more thing you need to know about—vapor barriers. Well-insulated attics, craw ...
There are many efforts to make building more comfortable and to reduce the carbon dioxide emissions from buildings. For many years ...
Imprinted on every batt or blanket of insulation or on every bag of loose insulation is its R-Value. The higher Insulation R-Value, the more insulation value you’re getting, and the more money you’re saving. (Maybe instead of rating insulating material R-3 and R-4 and R-5, it would be more graphic to rate it with dollar signs: $–3, $–4, $–5.) (more…)
You may have unfinished masonry walls in your basement. To insulate them, you’ve first got to create wall studs to hold the ins ...
If your house has no attic (most flat-roof houses don’t), chances are there’s a cockloft, a space between roof and ceiling, at ...
You must perform some sort of tour and visit of your home and property to find out exactly where it may need in applying insulation ...
It is easier and less costly to fit insulation in a new home than to retrofit. However, many existing houses have little or no insu ...
There are many efforts to make building more comfortable and to reduce the carbon dioxide emissions from buildings. For many years ...
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 ...
Microtechnology-Based Energy and Chemical Systems will most likely employ combustion for driving processes such as vapor generation and vapor barrier, endothermic chemical reactions, and (most notably) fuel reforming. Both fuel reformers and combustors will be of a miniature design relying on embedded catalysts for promoting chemical reactions at moderate temperatures (350–7501C). Many potential configurations exist depending on the application and constraints on the design. Microchannel arrays are a potential configuration; mesh and post architecture is another to achieve the desired surface area and small diffusional lengths necessary. (more…)
Fuel cells are direct energy conversion devices that combine two reactants to produce electrical power. The reactants are typic ...
Mixing is a process where two or more liquids or gas phase components are brought together and combined to form a uniform compositi ...
Heat-actuated heat pumps are cooling systems requiring no electricity for operation. Rather, a heat source is used, avoiding the ne ...
Many characteristics of traditional engines make them attractive for use in power generation and propulsion technology. They tend t ...
The most fundamental process from an energy systems standpoint is heat transfer to (or from) a working fluid. This unit operation t ...
The largest use of coal today is in the generation of electric power by electric utilities. According to the U.S. Energy Information Administration, about 65% of coal mined in the world is used for power generation. The next largest use of coal is in the production of coke for the iron and steel industries. Coal is still used for industrial heating and even commercial heating and residential heating in certain countries. (more…)
Power consumption from electricity is an essential element of the U.S. economy since the beginning of the century. Coal power plant ...
Natural gas and oil are common source energy used to give electricity. How efficient is coal if we compare to these other source of ...
The wind has covered every Sunday morning more than 50 percent of electricity & energy demand. It has also achieved the record high ...
Coal use today is no longer evocative of dirty power plants with polluting black smoke billowing from their smokestacks. Many o ...
Coal is still used to a small extent for home heating and cooking. In the homes of more affluent nations, coal is used for recreati ...
Global warming, CO2 emissions, deforestation and loss of biodiversity on the planet are just side effects of our carbon footprint. Like hundreds of organizations to develop initiatives to reduce the effects of human energy consumption, others have simply chosen to ignore the movement. If you want to help Mother Earth, there are ten top list ways to waste of energy that you can avoid: (more…)
Heating and Cooling systems can be a major contributor to a homes energy costs and associated greenhouse gas emissions. For som ...
Spring is here, which means that the summer heat is already here in Arizona. We all know how essential having an effective air ...
Nowadays, a lot more people are increasingly aware of the amount of energy they consumed everyday and what effect it was having ...
Ceiling fans are a popular room addition; comfort can be easily obtained with a flip of a switch. An immediate cooling breeze is cr ...
Don't sweat it out when you don't have to. Got your A/C running and still feel warm? Here are some tips that will help keep you ...
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Although the automotive industry is a vigorous sponsor of research and development in vehicle efficiency technology—worldwide, nearly $20 billion U.S. worth in 1997—governments throughout the world sponsor additional automotive R&D, both separately from and in partnership with the industry. This work focuses primarily on four areas: emissions reduction, safety, fuels, and fuel economy. Within the past few years, government sponsorship of automotive R&D has moved sharply in the direction of attempting to advance the performance and cost-effectiveness of automotive fuel cells vehicles, which address three of the four areas: emissions, fuels, and fuel economy. (more…)
We know of no studies that have examined vehicle taxation incentives programs elsewhere in the world, but it seems likely that ...
A number of countries have vehicle tax incentives programs designed to reward purchasers and owners of alternative fuel-efficient v ...
Both state and federal funding is available for research and development of Plug-In Hybrid Electric Vehicle (PHEVs) and other alter ...
The primary electric drivetrain components for fuel cell vehicles are the same as those for any electric vehicle: traction motors, ...
There are different types of vehicle propulsion systems and the transportation fuels that have been studied for their potential ...