Calculation Of Architectural Lighting Illumination
This paper introduces several sources of illumination and lighting power density calculation
, and compare the results, quality and efficient lighting products that are the basis for achieving the green light.
A "green light" concept put forward
Along with the building society advocate saving, energy saving concept has gained recognition and rapid penetration into all areas, "green light" concept has thus been more and more people are concerned. According to SETC, the Ministry of Construction, the State Quality and Technical Supervision, "on the further promotion of China's green lighting project view" of the spirit of the document, environmental protection as an important industrial policy in China, will have a reconstruction project on the new and important practical guidance. At present, China's "green lighting for the project" has been officially launched, is expected to save China's electricity for lighting in 2010 will reach 12 billion kwh, 10% of the total generating capacity.
Ministry of Construction and the State Administration of Quality Supervision jointly issued the "architectural lighting design standards" (GB 50034-2004) has been on December 1, 2004 come into force. The sixth? Scratch? Nuts = 9 ?????? chapter "Lighting Energy Conservation" section, the various construction sites correspond to the standard of lighting power density illumination LPD indicators (that is, electric power consumption per square meter) as the mandatory provisions to be restrictions. After nearly two years of work I practice, the actual work on the new standard in some of the views put forward in the application.
Two types of light source illumination calculation
Light source directly affects the choice of illumination and lighting power density (LPD), to meet the new standard in control and lighting power density value of degree requirements, lighting design must be detailed on the correct calculation. Otherwise it may be two situations: one is not high photosynthetic efficiency of light sources and efficient lighting, and the results meet the requirements of LPD, but the actual illumination of the room illumination can not reach the standards; the other is designed with a high luminous efficiency of light sources and high efficiency lighting, the room is not for illumination calculation, resulting in much higher than the required illumination illumination standards, not to save energy. Both of the above are not caused by the effective implementation of energy conservation. China's annual new large commercial buildings and public buildings are about 140 million square meters, people need a comfortable, efficient, energy saving, environmentally friendly lighting environment.
2.1 a domestic brand T12 lamps, T8 lamps compared with the targets T5 lamp
As can be seen from Table 1, T8 and T5 fluorescent tubes and efficient fluorescent tubes and efficient compared with the normal T12 fluorescent lamps, which greatly improved the optical efficiency, color rendering index and life, and could well achieve the energy saving purpose. Article through a typical office lighting instance, the above-mentioned three kinds of fluorescent lamps in the practical application of engineering for analysis and comparison of the effect produced.
2.2 Projects
2.2.1 office building size
Bay office, wall thickness 0.2m, length 8.1m, width 6.3m, the room area 48.2m2.
2.2.2 Source Selection
Refer to Table 2 data, according to the formula:
Eav = N U K0 / A
Then, N = Eav A / ( U K0)
That is, LPD = N Pw / A
The formula, Eav? Average intensity (lx);
N? Lamp (unit);
? A lamp light source within the total flux (lm);
U? Light utilization coefficient;
K0? Maintenance coefficient;
A? Room area (m2).
Under the new standards, the Office of the average illumination should reach 300lx, and the lighting power density of LPD should be less than or equal to 11W/m2.
As can be seen from Table 3, using T12 lamps, even with its own power with a small electronic ballast, such as requirements to meet the new standard illumination requirements, the power density will reach 13W/m2, this does not meet the The new standard "LPD 11W/m2" requirements; vice versa. The use of T8 lamps and T5 lamps with electronic ballasts can also meet the new standard on the requirements of illumination level and LPD, and compared with the normal T12 fluorescent, T8 fluorescent tube can be energy efficient 49%, T5 high efficiency fluorescent tubes to 54% energy saving.
3 ballasts and lighting quality is closely related to
Indispensable partner as fluorescent tubes, ballasts, power and performance has got much attention. For a long time, we got used to the conventional magnetic ballast, because it is good reliability, long life, low price, one-time investment is very low. However, magnetic ballast, because of its structural problems, there is power consumption, weight, heavy, bulky, strobe serious, noisy, and many other shortcomings, is gradually replaced by electronic ballasts. Table 4 on the traditional magnetic ballast and electronic ballast for the basic comparison of the performance, from which you can see both the advantages and disadvantages.
From the above comparison that electronic ballasts in their own power, luminous efficiency ratios have the clear edge. Similarly to the office as an example, assume that the original configuration of the three lamps were the traditional magnetic ballast.
Can be seen with magnetic ballast with electronic ballast power consumption will increase by 9.2% compared to 13.6% and 15%. Of course, T12 common fluorescent tubes are still unable to meet the new standards also control the value of reliability and power density requirements.
In addition, because the traditional magnetic ballast operating frequency is 50Hz, while the working frequency electronic ballast 20 ~ 50kHz, at this time were not easy to feel the eyes of a very high strobe, the visual environment more comfortable. Electronic ballasts also feature low-voltage activated, which can normally start between AC160 ~ 350V, the voltage required is relatively low. But there are also short service life of electronic ballasts, power supply current harmonics large capacity of power supply transient voltage relatively weak defects.
Inductance ballast energy-saving compared with traditional magnetic ballast, power and light effects in their own much better than the last; and electronic ballast, compared with the start surge current low supply current harmonic, of power supply transient over-voltage capability, long life and other advantages, is being recognized more and more professional.
4 Conclusions
China is in a period of rapid economic development, the pursuit of high quality of life, high-quality light environment, energy consumption has become a large number of social problems can not be avoided. Over the past that low light efficiency, high power light source has apparently unable to meet the needs of the new period. Must vigorously promote "green lighting project," so that a variety of high luminous efficiency, low power consumption, lighting products into the present and the future of the world's leading light.
Calculation Of Architectural Lighting Illumination
By: frbiz2@foxmail.com
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