|Saving Comparison Table|
Consider the case of a office in the building with a total of 1000 luminaries using existing lighting of 36W T8 fluorescent lamps and standard electromagnetic ballast. With the T5 Fixture, we can convert the existing system to energy efficient system and calculate the electricity costs saved by the T5 tube.
Many enterprises are aware that their electricity bill is a large portion of their total operating cost, the application of T5 Fixture is simple. The saving rates guaranteed, thus adding to your bottom line profits.
Energy Saving Per Fitting = 48W – 28W = 20W
Energy Saving Per day = 20W x 24 hrs x 1000pcs = 480 kWh
Energy Saving Annually = 480 kWh x 365 days = 175,200 kWh
Amount Saved Per Year = 175,200 kWh x $0.3045 = $53,348.40
Friday, September 25, 2009
Thursday, September 3, 2009
Home Energy Audits
A home energy audit is often the first step in making your home more efficient. An audit can help you assess how much energy your home uses and evaluate what measures you can take to improve efficiency. But remember, audits alone don't save energy. You need to implement the recommended improvements. ENERGY STAR provides extensive information about home improvement projects to enhance energy efficiency, lower utility bills, and increase comfort.
You can perform a simple energy audit yourself, or have a professional energy auditor perform a more thorough audit.
If you have five minutes and your last 12 months of utility bills, use the ENERGY STAR Home Energy Yardstick to compare your home's energy efficiency to similar homes across the country and get recommendations for energy-saving home improvements from ENERGY STAR. You will also need to enter some basic information about your home (such as zip code, age, square footage, and number of occupants). If you don't have your bills, contact your utility for a 12-month summary.
Hire a Professional Home Energy Auditor
If you are interested in getting specific recommendations for improving the efficiency of your home, consider contacting a professional Home Energy Auditor. A professional auditor can use a variety of techniques and equipment to determine the energy efficiency of your home. Thorough audits often use equipment such as blower doors, which measure the extent of leaks in the building envelope, and infrared cameras, which reveal hard-to-detect areas of air infiltration and missing insulation.
Your first step should be to contact your utility to see if they offer free or discounted energy audits to their customers. If not, you can hire a home energy professional, such as a certified Home Energy Rater, to evaluate your home's energy efficiency.
Home Performance with ENERGY STAR
Where available, Home Performance with ENERGY STAR can help you cost-effectively improve your home's energy efficiency. Specially-trained contractors evaluate your home using state-of-the-art equipment, recommend comprehensive improvements that will yield the best results, and help you to get the work done.
Home Energy Audit
A home energy audit may include a written report estimating energy use given local climate criteria, thermostat settings, roof overhang, and solar orientation. This could show energy use for a given time period, say a year, and the impact of any suggested improvements per year. The accuracy of energy estimates are greatly improved when the homeowner's billing history is available showing the quantities of electricity, natural gas, fuel oil, or other energy sources consumed over a one or two-year period.
Some of the greatest effects on energy use are user behavior, climate, and age of the home. An energy audit may therefore include an interview of the homeowners to understand their patterns of use over time. The energy billing history from the local utility company can be calibrated using heating degree day and cooling degree day data obtained from recent, local weather data in combination with the thermal energy model of the building. Advances in computer-based thermal modeling can take into account many variables affecting energy use.
A home energy audit is often used to identify cost effective ways to improve the comfort and efficiency of buildings. In addition, homes may qualify for tax credits from local and central governments.
Wednesday, September 2, 2009
NEMA and IEC Standard
NEMA standard used in northern America, especially the United States must be added that states that use the technology or buying plants from the United States. Meanwhile, the IEC adopted by some countries in the world except in America. In addition to other standards such as BS2613 British, German VDE and Japanese JIS 0530. Usually another standard that is adopted IEC metric.
NEMA or the National Electrical Manufacturers Association based in the United States.
IEC, International Electrotechnical Commission based in Europe.
Below is an example specification of an electric motor as an example for discussion in connection with the use of frequencies. What is difficult to avoid is that we bought a standard NEMA motors to be installed in the country that use IEC standard or vice verse. Requiring knowledge of electricity specifications and mechanical specifications of both standards.
Example: 100HP Motor, 230/460 V, 60 Hz,
Understanding of these specifications, are as follows:
- NEMA write with horse power capacity, 100 HP as the capacity or ability to move a load by the motor 100 horse power. Usually IEC stated capacity with KW (100 HP = 74.57 KW)
- 230V, motor winding consists of two sets of each phase and connected in parallel
- 460V, motor winding consists of two sets of each phase and connected in series.
- 60Hz, the frequency of electricity networks should be available for these motors.
(Retrieved from the table Leeson Motor Catalog)
Install the motor on 60 Hz 50 Hz Frequency
Power-grid in Europe and in almost all other countries use the system frequency 50Hz, except for North America to use 60Hz.
What is the effect of performance, put the motor in the frequency 60Hz. 50Hz? Is safe enough?
The answer to doubt "yes" or maybe "yes no".
So motor 60Hz, 460V at 50Hz, if installed, 380V will produce a satisfactory performance according to nameplate horsepower, and the rotation axis of rotation of 50/60 is only listed on the nameplate. So if 60Hz to 50Hz, that should Voltage 5 / 6 × 460V = 383V
Motor 60Hz 230V at 50Hz if installed 230V, may not satisfy without reducing horsepower for 0,80-0,85 factors. So HP mobilized rated load should be decreased, this relationship with the heat effects arising in the winding.
With the guidance table, it can be concluded that 100HP Motor, 230V/460V, 60 Hz, motor 1800Rpm connected 230V winding mounted on 220V / 50 Hz will occur as follows:
- Full load torque required 120%
- Round synchronous stator falls to 5 / 6 or 83.3% of 0833 × 1800 = 1500 Rpm
- Full load current to 115%
- Efficiency at full load down 2%
- Power factor down 3-4%
- Locked rotor torque rated up from the 130 to 135%
- Breakdown torque, up from rated to 120 to 125%
- Locked rotor currents from the rated up to 106%
- Heat in motor up to 153%
- Magnetic noise increases.