Improvement of Energy Efficiency of Pipeline Systems of a Building

Summary

Problems of the power saving in construction can be solved by means of reducing heat losses through the enclosing structures, installing heat and water meters, using nontraditional sources of heat supply et al. Issues of energy saving in pipeline engineering systems in the course of designing are not studied enough while a considerable part of power consumption by the systems of engineering support of buildings (up to 80%) falls on the drives of pumps and ventilators of pipeline networks: heating, water supply, ventilation, and air conditioning. Economic indexes are considered as criteria of energy efficiency of pipeline networks. The method of reduced expenditures is used for calculations.

Key words

energy efficiency , power consumption , heating system , ventilation system , reduced expenditures , rate of working medium movement

The time factor in a technical and economic calculation task

Summary

Developing quantitative estimates of technical solutions assumes the calculation of economic indicators of the considered solutions. The properties of engineering and economic comparison models with account of the time factor are considered. The key aspects and properties of engineering and economic comparison models of the options are presented; the analysis of the content of the discounted cost indicator was carried out; its main properties were highlighted. The conditions for bringing options to a comparable form, identical material result and targeted economic efficiency are considered. The graphical material interpreting the discounted cost indicator is given. A simple interpretation of the discount rate is proposed. Its effect on the result of solving the problem of engineering and economic comparison of the options is shown. The ratio of the discounted cost indicator to the indicator of the duration of the life cycle of objects is considered. A method for interpreting the discounted cost indicator in practical calculations is proposed. It is shown that the knowledge of the general principles compensates for the ignorance of certain facts.

Ключевые слова

reduced expenditures , efficiency of investments , discounted costs , discount rate , the task of optimizing the parameters and structure of pipeline systems , optimization criterion