cost analysis
In 2004, the Ministry of Construction of China implemented and passed the “Energy Conservation-City Green Lighting Demonstration Projectâ€. China's energy conservation - the basic purpose of urban green lighting is to save energy, protect the environment and promote health. The main purpose is to ease the contradiction between the rapid development of urban lighting and the tight supply of electricity through the implementation of the project, so that the urban lighting engineering is scientific, healthy and sustainable. We have conducted a survey. More than 70% of the school's electricity use is used for lighting. As a very important part of the city's lighting power, the school guarantees proper illumination, guarantees students' physical and mental health, and saves energy. It is imperative to promote green lighting environmental engineering.
Design is a pioneer in engineering, so we talk about the need for green lighting on campus from the decision-making stage. The energy saving in general campus lighting design can be summarized as follows: appropriate illumination, reasonable lighting arrangement, high-efficiency light source and lighting, energy-saving ballast, full use of natural light, effective lighting lines and control schemes.
We use a mathematical operation to make a cost analysis. We choose the C indicator of the most common lighting equipment fluorescent lamps and bulbs on the campus for analysis and comparison.
C represents the average unit time and the required lighting cost per unit of luminous flux over the life of the source.
C=(P+C t)/(F×T) where P is the electricity cost (yuan) consumed by the luminaire during its service life. C t is the price of the luminaire (yuan) T is the life of the luminaire (h) F is the source of the light Total luminous flux (lm)P=(W t+W z)×T×p/10 3 where W t is the lamp input power (W)W z is the ballast loss (W)p is the electricity price unit price (yuan/KW
h) Economic index of 40W fluorescent tube C 1: W t=40W, C t=4 yuan, W z=8W, T=3000h, F=2400lm, p=0.5 yuan/KW of known fluorescent lamps
h Therefore: P 1 = (40 + 8) × 3000 × 0.5/10 3 = 72 yuan C 1 = 72 + 4 / 2400 × 3000 = 10.6 × 10 6 150W economic indicators of the bulb C 2: W t = 150W, C of the known bulb t=1.00 yuan, T=1000h, F=2090lm, p=0.5 yuan/KW
h: so: P 2 = 150 × 1000 × 0.5 / 10 3 = 75 yuan C 2 = 75 + 1/2090 × 1000 = 36.3 × 10 6 compared to: C 2 / C 1 = 3.42 / 1 from the above data we can see The price of fluorescent lamps is about four times that of incandescent lamps, but the lighting costs only 1/3.42 of incandescent lamps, and the life of fluorescent lamps is three times that of incandescent lamps. The luminous flux of the two is close, but the power consumed by the fluorescent lamp is 1/3.42 of the incandescent lamp. It can be seen that the longer the life of the light source, the greater the luminous flux emitted by the user, and the lower the overall lighting cost incurred by the user.
The illumination of the two lamps is similar. If such lamps have several green lighting fixtures, should the user choose? Naturally, it is an environmentally friendly luminaire. If you consider the luminaire, you can save a lot of cost for the user. Naturally, gather sand into a tower and gather a cup into a river. The designer considers the user in each link, accurate accounting, and reasonable design. The entire project will save costs for the user and save energy for the society. What we usually call "the engineer has a line, the project costs thousands of dollars." This is the truth. This kind of work once and for all, the design of the engineer's meticulous and economical design is indeed crucial. May our engineers do their due diligence.
Design is the premise of engineering, construction is the subject of engineering, and use is the purpose of engineering. Careful construction is also an important part of good engineering. Try to prevent unnecessary waste in construction and promote the use of inexpensive, economical materials. Reasonable, standardized and correct operation and maintenance of the project is very important for ensuring a good lighting. Regularly check and maintain the lighting circuit, clean and dust the lighting fixtures, ensure safety, high quality and comfortable lighting, and create a beautiful Campus lighting environment.
In short, campus lighting can only be realized in the design, construction, and operation of all aspects of the organization, reasonable arrangements, standardized operations, campus green lighting project can become a reality.
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