Application Technology and Economic Benefit Analysis of Lighting Sources in Railway Stations

The evaluation of lighting application technology should include five factors: quality life, light efficiency, energy saving, environmental protection and cost-effectiveness. The quality life of lighting depends on the light decay rate of the light source; the light effect level of the lighting depends on the lighting effect of different railway stations, and meets the relevant technical standards; and whether the energy-saving and environmentally-friendly lighting products can be widely and quickly accepted by users, depending on At the level of energy efficiency (power saving capacity) and whether it can bring corresponding economic and social benefits to users. Consumers generally consider two aspects of the purchase of energy-efficient lighting products: first, the increase in purchase costs; second, the decline in the cost of use. Measuring the impact of energy-saving lighting products on consumers can be obtained through cost analysis of life cycle, analysis of investment payback period and analysis of energy-saving costs, to determine which energy-saving lighting products are more economical and reasonable, and more easily accepted by consumers.

In the formula: PC—the purchase price includes the initial installation cost, such as equipment and installation labor costs;

OC—the cost of using the cost product to take into account the discount factor throughout its life cycle, including the cost of electricity and the cost of replacing the light source during its lifetime;

OCt—the cost of use for the t-year of the life cycle, including electricity and lighting maintenance costs;

r—Discount rate, discounted means that the monetary value of the energy (savings) during the future (life cycle) period is lower than the current equivalent denomination (savings) value, so the recovery funds should be considered when calculating the recovery investment funds. Discount rate

N—life cycle, usually calculated as a. Annual life calculation of the light source:

N = L /BHY( a)

Where: L—the life of the light source (h);

BHY—The annual light source ignition time (h).

(2) Investment recovery period cost

The payback period is the time required to recover an increased investment in energy efficient lighting products.

The payback period is the ratio of the added value of the purchase price (including the installation fee) to the cost of the annual use (including installation).

The calculation of the payback period is shown in formula (2):

PAY = â–³PC / (â–³E + â–³LRC) (2)

Where: PAY——— payback period (a);

â–³ PC - the increased purchase price (yuan);

â–³ E - the cost of saving electricity in the year (yuan);

△LRC—The cost of annual maintenance costs reduction (yuan).

If the payback period is longer than the product life, it means that the reduced cost of use is not enough to offset the increased purchase cost, and the user's economic interests will be impaired. That is to say, consumers will have to pay higher costs when they buy this product. Thus the product loses its market value.

(3) Energy saving costs

Energy saving costs are considered during the life of the product, taking into account

In the case of a discount rate, the annual cost increase is divided by each

The amount of electricity saved in the year.

The calculation method of energy saving cost is shown in formula (3):

CCE = CRF × △PC /△E (3)

Where: CCE———Energy saving cost (yuan/kWh);

â–³ PC - - cost increase value (yuan);

â–³ E - the amount of electricity saved in the year ( kWh);

△CRF———The annual investment capital recovery rate.

CRF = l /PWF

Where: PWF - the present value coefficient.

PWF = ΣN t = 11 / (1 + r) N =1 / r[1 - 1 / (1 + r) N] (4)

The cost of energy saving is related to the price increase of energy-saving products and the level of energy efficiency (power saving capacity). Therefore, energy-saving lighting products should be continuously improved and improved, and energy-saving costs should be reduced to be welcomed by consumers in the market. When the energy saving cost is higher than the electricity fee paid by the user, the user's economic benefit is impaired. Conversely, when the energy saving cost is lower than the electricity fee paid by the user, the user obtains economic benefits.

2 Field comparison test light source and economic benefit analysis

According to the current situation of the use of light source by Shanghai Bureau and Shenyang Bureau, through the on-site comparison test of LED light source and various existing light sources, the main technical parameters of energy-saving light source are proposed, and the energy-saving effect and economic benefit are comprehensively compared and analyzed.

On-site comparison tests were conducted at 4 different workplaces of the Shanghai Bureau and 1 workplace of the Shenyang Bureau. The specific number of lamps and electricity consumption are shown in Table 1.

Table 1 shows that: in the same work site, the number of comparison lamps and the same usage time of the lamps, the LED light source has less power and less power consumption than the existing light source, and the maximum illumination value is close to the existing light source. Even higher than the existing light source.

Quantitative analysis of product life cycle, investment recovery period and energy saving cost, comprehensive comparison, calculation of energy saving effect and economic benefit. Some of the calculation parameters are provided by the National Development and Reform Commission Energy (2008 edition, 0rg /CO2 / ).