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09.04.2014
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Managing the energy and other needs in buildings efficiently and intelligently can have considerable benefits. Buildings’ energy consumption in the EU represents about 30% of total EU energy consumption and between 25 and 40% in OECD countries (OECD, 2003). Since their introduction in the 1960s, BEMSs control systems have become more and more sophisticated. When the technology is applied in commercial buildings or in industrial facilities, it can contribute to social development in two ways. The IPCC (2007) concludes on the BEMS technology that it is as of yet unclear how much the technology can reduce energy usage and at what costs. Currently, no projects in the CDM portfolio are registered regarding the implementation of BEMS technology. Passive solar house plans are know for being durable, which means they’ll typically last for years. House plans solar optimized for energy conservation (typically over 40% and 100% is possible in some cases), more natural glare free daylighting, and living solar! Create your own luscious low cholesterol t plan packed with good cholesterol foods that will effectively lower your LDL cholesterol and raise your HDL cholesterol. Installing energy saving products may qualify you for up to $500 in home improvement tax credits. Since 2003 we have been living and building on the land, working in environmental projects and community. Doug Nordam of Mililani says he's seen his electricity bill decrease considerably since installing photovoltaic roof panels that turn sunlight into electricity. For decades, Hawai'i homes were built with little thought toward how to cool their interiors.
Then, in 2000, a housing boom on the sun-baked 'Ewa plains prompted a push toward environmentally friendly homes. From new subdivisions to custom houses to remodeling jobs, environmentally friendly homes are becoming more commonplace, sparked by recent building codes and consumer awareness that grew out of the boom. Advocates say these "green built" homes can save consumers hundreds of dollars a year in energy-related costs and help reduce the state's dependency on oil. Development in 'Ewa remains the hot spot of residential building on O'ahu and is the birthplace of the new energy-efficient push.
But energy-conscious homes were not developers' main concern when they started building on the 'Ewa plains in the late 1990s and 2000, said Howard Wiig, an energy analyst with the state Department of Business, Economic Development and Tourism. The situation "became so dire," that DBEDT was able to convince the City and County of Honolulu in 2001 to adopt the first residential energy codes in state history. The new code required builders to shield roofs from the sun by choosing from several solutions, including radiant barriers that reflect heat, insulation and highly reflective roofing material, Wiig said. DBEDT estimated in 2001 that a home on O'ahu built to conserve energy and fitted with a solar water-heater, energy-saving appliances and lighting could save a family $831 to $1,131 a year. Many home builders in the state are using energy-efficient materials and designs even though it can increase the cost of a home, Nakamura said. The building association's membership includes commercial builders responsible for 80 percent of the new homes in Hawai'i and all of them employ "green building," Nakamura said. It's part of the association's Hawaii BuiltGreen Home Program, an education effort aimed at builders and the public that also began in 2000. Builders are given a rating based on how well they follow the list — and consumers want to know who those builders are, Nakamura said.
The cost of a home can be 2 percent to 10 percent higher, depending on the number of things a builder has done to increase efficiency, Nakamura said. But those traits can drop the temperature in a home by almost 10 degrees, which means an environment that rarely needs air conditioning, Nakamura said. There are various guides available from DBEDT and the BIA that can be used to build a cooler home. So-called "passive cooling strategies" can eliminate the need for central air conditioning. Windows and screen doors can be placed to take advantage of prevailing winds whenever possible and a light color choice for roofing material and exterior paint can reflect heat.
It costs about 80 cents a square foot to install but will eliminate about 80 percent of the heat getting through, Meder said. Similarly, insulation placed in an attic will keep heat from being transferred to the room below. That same pounding sun that can sizzle rooftops to 150 degrees can be used to trim 40 percent off an electric bill if the homeowner installs a solar water-heater. A building energy management system (BEMS) is a sophisticated method to monitor and control the building's energy needs.
Developing countries have a less efficient building stock where it is even more important to improve on building energy efficiency. The remote outstations can function independently or can be controlled by the principal operator position. Rapid developments in BEMS hardware, such as sensors and communication highways, and computer processing power have made BEMS a preferred management system (IPCC, 2007; MOD, 2001). By making the workplace safer, and healthier.First, due to the improved fire, security and other emergency procedures that the technology offers, the workplace will be much safer. Estimates provided on the technology energy savings differ considerably and therefore the technology requires more research and development to determine the financial requirements and costs. Check out our Texas electricity rates and plans, and see why TXU Energy is the #1 Texas power company. Department of Energy (DOE) on natural gas, coal, turbine systems, fluidized bed combustion and fuel cells. Building industry officials say consumers have become well-educated about going green and are willing to pay extra for it. But even though experts say Hawai'i offers a nearly perfect climate for energy-efficient construction, widespread acceptance has not been reached. Thousands of homes went up — including many on the flight path to Honolulu International Airport — that relied on central air conditioning to keep them quiet as well as cool. The trade association has produced a list of 248 things a builder can do to create a more energy-efficient home and more than 1,000 homes have been built in the past five years using green guidelines. Some are simpler than others, but all rely on a basic philosophy that combines new building materials and common sense, said Meder, the UH architecture assistant professor.
Walls exposed to strong sun can be shielded by roof overhangs and trees but they can also be built with material that reflects the heat. These barriers are made of thin sheets of polyethylene air bubble packets sandwiched between thin layers of highly reflective aluminum foil.
For years, it has been the poster child of energy-efficient homes and is a proven resource able to save a family of four about $625 a year. So, most of this information is not mine – but freely available to anyone who wants to conduct their own research.
Next to energy management, the system can control and monitor a large variety of other aspects of the building regardless of whether it is residential or commercial. In the EU-25, in 2003 total CO2 emissions amounted to 3.8 Gtonnes of which 479 Mtonnes were household emissions (12%) (EU, 2005).
Not only have the rapid developments significantly reduced costs of a sophisticated management system, the advances in technology have also increased the possibilities for a BEMS and therefore increased its potential. For example, Birtles and John (1984) estimate energy savings up to 27 % compared to no BEMS installed, while the IPCC notes estimates between 5 % and 40 % (IPCC, 2007). Basically, BEMS technology is an energy efficiency measure, since it streamlines the use of appliances and services in a efficient manner.
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Asphalt and concrete areas have been found to be as much as 30 degrees cooler when shaded, the state claims. I put much of what I found here just to save you the time to do your own homework – but at least it will give you a few ideas and you can then do your own further investigation.My premise is that we need a new Model for Housing, as the older homes will not hold their value by today’s Renewable Energy standards, and the next generation buyers will quickly be drawn to a more energy efficient model. Passive Solar House Design In this chapter, we describe the resource that we found for passive solar design in hot, humid climates is the Florida Solar Energy Center. Examples of these functions are heating, ventilation and air conditioning (HVAC), lighting or security measures. In the UK, the domestic sector represents about 28% of CO2 emissions and within that space heating is 53%, lighting and appliances 22%, and water heating 20%. For instance, advances in information technology makes monitoring via the internet possible. Since the technology does not generate energy it is therefore a demand side energy efficiency measure.
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These new buyers are also looking for different designs than older homes typically offer for their lifestyle choices. As mentioned, a BEMS can monitor and control many factors within the building, or within a group of buildings. In addition, it is now possible to monitor many buildings at the same time, and integrate functions of several buildings. Similar to potential fire or security hazards, the technology can monitor factors such as air quality and water quality and can react when value thresholds are crossed.
Building Energy Management Systems (BEMS) control the functions of the building, allowing a smooth operation and efficient functioning of the building.
For instance, the system can increase ventilation when the carbon monoxide levels in a facility increase above a level considered safe.When the technology is applied in residential buildings, it informs residents about their energy consumption. The methodology concerns energy efficiency measures such as energy efficient appliances or an optimal arrangement of appliances.
Your source for everything lighting including outdoor lighting, kitchen lighting and pendant lighting. Many younger buyers will want them and will be attracted to them because they are included in the financing of their new home.Here is a list of points that this market needs to address to be successful. Making use of solar energy is become more popular as people realize the enormous benefits of this clean energy.
While the IPCC (2007) notes that the technology is expensive, the IPCC also considers the technology effective in both cold and warm climates and in developing and developed countries. Therefore, when the other criteria of the methdology are met, BEMS technology might be suitable for this methodology. NYSERDA’s residential programs help homeowners and renters reduce their energy costs through incentives and low-interest loans. From DIY instructions for home improvement projects to design inspiration for your home, eHow offers all the essential how-to info you need. The system can have atrributes from all facets of building control and management functions such as heating, ventilation and air conditioning (HVAC) to lighting, fire alarm system, security, maintenance and energy management.
The figure shows a BEMS controller controlling the system based on a timer, external inputs such as temperature, and based on feedback from the system itself. In other words, the energy savings the technology is able to achieve, make up for its higher initial costs. 2) Offer them the best combination of Energy Saving features built into the price of the home. Another common description is that BEMSs are control systems for individual buildings or groups of buildings that use computers and distributed microprocessors for monitoring, data storage and communication (Levermore, 2000). Source: MOD, 2001The IPCC (2007) notes that commissioning is a key stage in the implementation of the BEMS. The information the technology provides to residents and the actions the technology can perform can therefore contribute to social development by increasing comfort and reducing energy consumption.While the operation of the technology might be relatively straightforward due to a sohisticated interface, there is still a need for skilled operators of the technology. Other terms frequently used for this technology are Building Management System (BMS) and Energy Management System (EMS).As such, the BEMS technology is a broad concept of building control, and can have a variety of characteristics. In addition, the installation of the technology requires training of the installation personnel.The reduction in overall energy demand due to the use of BEMS results in an increased security of energy supply. However, the term BEMS is limited to use for sophisticated and advanced control systems (IEA, 1997).
In other words, it is essential to consider the BEMS technology and its required functions in the earliest stages of design to optimize the operation potential and consequently the energy savings of the technology. In addition, high penetration rates of the technology reduces the need to build additional energy power stations and reduces the demand for import of energy.One main characteristic of the technology is that it is capable to provide real-time and extensive data on energy consumption to the facility operator.
Therefore, while all buildings require and have some form of control system, BEMS technology is substantially different from previous control systems. Basically, it is more practical to incorporate a BEMS into the design of the building compared to retrofit a BEMS into an existing building.
The main point in which a BEMS differs from other control systems is the characteristic of communication: information of the processes and functions of the building can be received and controlles at a central, single operating unit. For example, considering BEMS functions such as vertical transportation management into the design of the building, is more practical as all essential electronics and wiring can be incorporated into the design. Additionally, the BEMS itself improves energy efficiency by streamlining the operation of the machinery it monitors and controls.
Concluding, the IPCC (2007) notes that the commissioning process ensures clear design intent. Improved energy efficiency leads to increased protection of the environment due to the reduced need for resources. For instance, improved efficiency in the electrical requirement of the building directly results in lower carbon dioxide and SO2 emissions when the electricity is provided by a coal powered facility.For example, according to the IEA, lighting ranks among the major end-uses in global power demand.
It may not be your idea of a new home, but we will develop different Models in the future and as we get close to realizing our goals I will publish another article outlining all the Actual Costs involved in building this new Model.
For instance, the central and single operating unit can receive information of temperature and building occupancy and can make the decision to lower the temperature in parts of the building that are not occupied. Lighting represents 650 mtoe of primary energy consumption and 2550 TWh of electricity consumption in 2005.This means that grid-based electric lighting is equivalent to 19% of total global electricity production. The statistics supplied by the IEA report (2006) shows that lighting requires as much electricity as is produced by all gas-fired generation or 1265 power plants.
Figure 1 illustrates a possible BEMS configuration in which multiple buildings are connected to each other and are connected via the internet to a central operating unit to allow smooth cooperation among the buildings and increase efficiency. The most accurate way to find the average wattage of a device is to measure it with a watt-hour meter.Exercise #1. Contribution of Working Group III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change [B.
This is important because your savings are also figured for the highest tier you’re in. Assuming the electricity is generated by a typical power plant with an efficiency of around 30 percent, it means that the average electric water heater is responsible for about eight tons of carbon dioxide (CO2) annually, which is almost double that emitted by a typical modern automobile. The same family of four using either a natural gas or oil-fired water heater will contribute about two tons of CO2 emissions annually in heating their water.Conventional Water Heaters PolluteSurprising as it may seem, analysts believe that the annual total CO2 produced by residential water heaters throughout North America is roughly equal to that produced by all of the cars and light trucks driving around the continent. Some makers of gas-fired tankless water heaters claim their products can cut your energy costs up to half over regular storage heaters.
Gas tankless water heaters, which use high-powered burners to quickly heat water as it runs through a heat exchanger, were 22 percent more energy efficient on average than the gas-fired storage-tank models in our tests. That translates into a savings of around $70 to $80 per year, based on 2008 national energy costs. But because they cost much more than storage water heaters, it can take up to 22 years to break even—longer than the 20-year life of many models. Moreover, our online poll of 1,200 readers revealed wide variations in installation costs, energy savings, and satisfaction.With the help of an outside lab, we pitted Takagi and Noritz gas-fired tankless water heaters against three storage water heaters.
Even in areas with warm groundwater, most homeowners would need to upgrade their electrical service to power a whole-house tankless model.Our tests simulated daily use of 76 to 78 gallons of hot water.
That’s the equivalent of taking three showers, washing one laundry load, running the dishwasher once (six cycles), and turning on the faucet nine times, for a total of 19 draws. When you turn on the faucet, tankless models feed in some cold water to gauge how big a temperature rise is needed. It takes time to heat the water to the target temperature, and just like storage water heaters, any cold water in the pipes needs to be pushed out. Tankless models need electrical outlets for their fan and electronics, upgraded gas pipes, and a new ventilation system. That can bring average installation costs to $1,200, compared with $300 for storage-tank models.Tankless units might need more care During our long-term testing, an indicator on the tankless model warned of scale buildup. Many industry pros recommend that tankless models be serviced once a year by a qualified technician. Experts suggest installing a water softener if your water hardness is above 11 grains per gallon. Instead, we recommend buying a conventional storage water heater with a 9- or 12-year warranty.
In previous tests, we found that those models generally had thicker insulation, bigger burners or larger heating elements, and better corrosion-fighting metal rods called anodes.Does a tankless water heater make more sense than a solar water heater?We don’t think so. And the amount of energy required to heat a gallon of water to a certain temperature does not change just because it is being heated at a faster rate.The tankless water heater only eliminates energy costs for maintaining the temperature of water that has been heated and is sitting in the storage tank awaiting use. So a tankless water heater saves about 15 percent of the heating energy needed by a conventionally insulated electric or gas water heater. Solar storage tanks have extra insulation, to keep water heated during the day hot overnight, so you get the same temperature maintenance savings with solar.And tankless water heaters do have drawbacks. On the other hand, tankless water heaters cost much more than conventional water heaters to install, so the total installation cost for more than one tankless water heater can quickly surpass the cost of a single solar water heating system.Why not just install a solar water heater?
Solar water heaters provide all the benefits of tankless water heaters but eliminate up to 90 percent of your water heating costs.Solar Water Heaters Gaining PopularityHaving half of all households use solar water heaters might not be such a tall order. Solar water heater systems can work in any climate and EESI estimates that 40 percent of all U.S. According to the EESI, residential solar water heater systems cost between $1,500 and $3,500, compared to $150 to $450 for electric and gas heaters. With savings in electricity or natural gas, solar water heaters pay for themselves within four to eight years. Like your refrigerator, heat pumps use electricity to move heat from a cool space into a warm, making the cool space cooler and the warm space warmer. During the heating season, heat pumps move heat from the cool outdoors into your warm house; during the cooling season, heat pumps move heat from your cool house into the warm outdoors.


Because they move heat rather than generate heat, heat pumps can provide up to 4 times the amount of energy they consume.The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.
If you heat with electricity, a heat pump can trim the amount of electricity you use for heating by as much as 30%–40%. High-efficiency heat pumps also dehumidify better than standard central air conditioners, resulting in less energy usage and more cooling comfort in summer months.
However, the efficiency of most air-source heat pumps as a heat source drops dramatically at low temperatures, generally making them unsuitable for cold climates, although there are systems that can overcome that problem.For homes without ducts, air-source heat pumps are also available in a ductless version called a mini-split heat pump.
Although they cost more to install, geothermal heat pumps have low operating costs because they take advantage of relatively constant ground or water temperatures.
Absorption heat pumps use heat as their energy source, and can be driven with a wide variety of heat sources. For more information on these specific types of heat pumps, research these types:Air-Source Heat Pumps Ductless Mini-Split Heat Pumps Geothermal Heat Pumps Absorption Heat Pumps. One of the great pros of solar energy is the ability to harness electricity in remote locations that are not linked to a national grid.
A prime example of this is in space, where satellites are powered by high efficiency solar cells. Solar panels can be installed on top of many rooftops, which eliminate the problem of finding the required space for solar panel placement.Another great pro of solar energy is the cost. Currently, prices of highly efficient solar cells can be above $1000, and some households may need more than one.
With the growing popularity of sustainable practices and the awareness of the precarious state of our environment, people it seems are finally starting to take notice of these common sense approaches and it is has increasingly become fashionable to be sustainable. This demand should fuel a greater need for cheap solar technology which will in turn drive innovation. The panels are typically made by sandwiching a core of rigid foam plastic insulation between two structural skins of oriented strand board (OSB). SIPs are manufactured under factory controlled conditions and can be custom designed for each home. The result is a building system that is extremely strong, energy efficient and cost effective.
Building with SIPs will save you time, money and labor.Are Structural Insulated Panels More Expensive?Building with SIPs generally costs about the same as building with wood frame construction, when you factor in the labor savings resulting from shorter construction time and less job-site waste. Not only is this conducive to improved quality control, it’s also possible to manufacture year round during any type of weather.By designing buildings to have one predominant panel size, panel manufacturing becomes a repetitive process and gains efficiency. Following a two-step casting process, the resulting void between panels can be filled with insulation. It also means that construction can be completed within a relatively small footprint and may allow building in weather that would negatively affect other types of construction. Solid, high-quality concrete construction built with an efficient use of labor makes for cost effective structures.Precast, like all concrete construction, provides fire, rot, termite, and mold resistance.
The range of colors is quite wide if white cement is used.One of the most common surface treatments is exposed aggregate.
Form faces can be treated with surface retarders prior to casting, or, following hardening, the surface of the concrete can be textured with abrasive or water blasting. Exposed aggregate finishes are usually sealed to provide added resistance to water penetration. This allows the simulation of many other finishes such as hand laid masonry (brick or stone). Still others prefer attaching the finish at the site to create either a cavity wall or a barrier wall.
Portland cement plaster is also a suitable finish for precast, and can be directly applied to panel faces. Interior finishes may be given the same treatment as exterior faces, or may receive a direct application of plaster or paint, or they can be finished with drywall for a more conventional appearance.From a performance perspective, the system creates an energy efficient envelope. The size of panels dictates joint spacing, but often the number of joints is reduced over other types of construction, which helps create tight building envelopes. This protects against unwanted air losses and may even require that air changes be provided. It is common to downsize HVAC equipment and increase mechanical ventilation in precast concrete buildings.Insulated precast panels may reduce energy consumption by 20% to 30% in smaller buildings. This is because the panels are so energy efficient, having insulation combined with the thermal mass of concrete. Next-door neighbors may like it warmer or cooler, louder or quieter than each other, but the insulated concrete panels means they can both have it just the way they like it.Depending on the location of manufacturing relative to the project site, precast may also contribute to local materials credits in some green building rating systems.
Also, precast producers are located throughout North America, and it is common to source the panels from a relatively close producer to minimize the time and expense of shipping. Whether they think of it as ?building green or ?sustainability, today’s consumers expect homes and other low-rise structures to have minimal environmental impact yet meet or exceed their lifestyle needs.
They want properties offering comfort and security with low energy bills and low maintenance. The U-factor is key in the winter months, and important to consider in choosing a window.Solar Heat Gain Coefficient (SHGC) — this measures how well a product blocks heat from the sun. In southern climates or high sun intensity areas, you might actually want to keep the sun’s heat out of your house.
But actually, for windows and doors, U-factor and solar heat gain coefficient are more important measurements.Design Pressure Rating — the ?DPR measures the amount of pressure a door or window will withstand when closed and locked. Each DP rating also establishes other performance factors such as water penetration, air infiltration, structural pressure, forced entry and operational force. Look for the certified hallmark of the Window and Door Manufacturers Association.So, HOW to include DC in an AC-Powered Home?The way I see it, one of these ways would be to convert a power scheme in a house.
Random question perhaps, but if you saw what the power strip looks like, you’d catch my drift. Every one of those little electronic devices is too small for a transformer, so they all have AC-DC converters which can power the device with a different required voltage. Then when your device is not outputting power, you simply switch to grid power and start buying it from the power company.
And while this exercise excludes that option (for people living in the middle of nowhere or with unaccommodating power companies), it would be nice to sell any excess power back to make a small profit.Economies of ScaleThis is possibly one of the biggest problems that an all DC power system would face: No one does it yet! All parts would have to be custom made and you couldn’t just call an electrician to come out and fix your stuff.This also means that you would have a tough time buying consumer goods.
Not to mention all of the internal components for AC conversion and occasional power filtering (some devices need very clean DC power). Let’s just say you couldn’t go buy a TV and plug it in…Government regulation would also limit any kind of large scale implementation of DC power sockets.
It is almost guaranteed that it would require government certifications on many levels to allow manufacturing large enough quantities to bring the cost down for Mr.
John Q Everyman.Conversion to AC for certain devicesMotors are the first kind that comes to mind.
This is basically how Nikola Tesla got started onto AC, proving that it is much more efficient when using AC than DC AND that these motors do not rely on voltage level (DC motors’ speed can be controlled by the voltage applied). Those are changing the ridiculously high voltages in the power lines (done for transmission efficiency) down to something that we can use in our houses.
The more components in a system or the higher voltage you run at, the more leakage you will tend to have (Ever wonder why electronic devices run out of batteries eventually, even if you don’t use them for a long time?).
This would apply to any DC system too and when you don’t have the lights on or anything running, there’s still a chance that the power devices are leaking. This point was discussed above, but is THE main point of the article and for going to all this trouble. And if you do need an AC power source, the inverter could be much smaller, in order to handle smaller loads or in order to sell power back to the power company (once the batteries are fully charged)LED LightingCurrently any LED fixture installed in homes requires an AC-DC converter.
Using a DC wiring system throughout a home would allow easy installation of LED fixtures and elements (the LEDs themselves)No 60 Hz humI’m sure most of you know what this sounds like from a faulty light switch, an older device with poor power supplies or even by sticking a fork in the wall. The native frequency of power coming out of the wall is 60Hz in the US, but varies by region. Either way, this is something that I’ve had to deal with at my job and that all electronics designs have to deal with. With an all DC system there would be other issues such as power filtering and voltage stability… no hum though!Shrinking power suppliesAs devices continue to get smaller, the power supplies are reaching a lower limit.
This allows for less power consumption, as is governed by the formula P = V? * f * C (where P = power, V = voltage, F = frequency and C = capacitance). Have you ever noticed how they stopped increasing the frequency of microchips past a certain point (~3.5 GHz)?
As more and more devices go towards these lower voltages, there will be less need for conversion (or alternately, more need for AC-DC converters if wall power remains as AC).So the final question comes back to that posed by the giants of the 19th century: AC or DC power? In hot humid climates the long axis of the house should be oriented for cross-ventilation as well as for sun-protection…Orientation and shapeA well oriented home, with a proper shape and properly placed windows can cut your energy bills by 30 percent or more. We shouldn’t forget the very basics about the sun’s path in the sky: sun rises in the east and sets in the west and is higher in the summer sky and lower in winter.
A variation till 20 or 30 degrees is rather irrelevant, and there are particulars and adaptations that should also be considered.Building shape and axisRectangular-compact buildings, with their longer walls facing the winter low sun (to profit from it), are excellent solutions.



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