With the progress of science and technology, more and more energy-saving technical measures and methods. But should be noted, however, that no matter what kind of method, not only the restriction of the basic law of thermodynamics, but also restricted by economy, must also can't be endlessly to pursue the high efficiency, without considering the economic effect. Energy itself is not the ultimate goal, not for energy conservation and energy conservation, energy conservation is the final day in order to obtain the best economic effect. Therefore, using any 'energy saving measures, must consider the economic rationality of it.
Technical and economic problem is there are two broad categories:
First, there is compliance with the provisions of the state. This not only have technical indexes and economic indexes, but also social problems, such as environmental protection, etc.
The second category for scheme selection problem. That is to say, meet the first kind of plan is very much, how to filter. The prerequisites for: - 'is to meet needs, two is the reliability of the scheme. To meet the two basic conditions of various kinds of scheme selection, finally find out the best solutions. Such as 400 c steam heat pipeline of adiabatic insulation materials and solutions. First, the use of thermal insulation material temperature must be greater than 400 c, the long-term use of stability is better. And then on technical and economic analysis of its program for roughly:
(1) design a variety of possible technical solution;
(2) analysis of the pros and cons of solution in the aspect of economy, lists the various factors that affect economy, find out the close relationship between home and economy index;
(3) solving the indicators of the v value efficiency and find out the best solution;
(4) make a comprehensive analysis and evaluation, to select the most scientific and reasonable implementation plan.
Useful value is a consumption and production activities of labor created after work. Labor cost includes laborer labor that are consumed in the production and consumption in production and the amount of equipment, tools, materials, fuel and power, etc.
Should not only consider the technical solution to calculate the economic effect after the implementation of the direct effect, but also the indirect effect it brings.
Thus, a comprehensive evaluation of energy saving scheme of economic effect is a very complicated work, actually could not only use a single parameter or with a comprehensive indicator to measure, and must be combined with the actual, lists the relevant indicators, through comprehensive comparison phase analysis to practical conclusions.
At present, the technical and economic analysis of energy saving measures and methods and indexes of evaluation is not - and member of the commonly used main indicators include:
L investment indicators
Investment refers to realize an energy saving solution for one-time spending money fixed assets and current Xin
When computing the two direct investment, and investment related to the direct investment, such as factory special railway line.
2. The cost target
The unit of the cost of energy saving, it is to point to in the process of production of worker with monetary form wage, raw material cost, maintenance and management and the total amount of the cost of depreciation of fixed assets, etc.
3. The profitability indicators
Main lifting unit investment costs and profit margins indicator"
4. The construction speed and effective time indicators
During the construction according to the facts and indicators such as length of service.
5. Materials and resource consumption indicators
Refers to save per unit energy consumption of raw materials, materials, etc.
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