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In the 20th century, giant reserves of natural gas were discovered, intensive construction of main gas pipelines began, and effective technologies for liquefying and transporting natural gas in a reduced state appeared. This led to the fact that in the first decade of the 21st century the share of natural gas in the world energy balance increased significantly. The developed and well-established transportation system and modern fuel and energy equipment allow the delivery of natural gas to almost any place on the ...

This article is referring to a study regarding the energy consumption and data for the internal heat gains and opening hours at a big size commercial building built in Bucharest, Romania. The monitoring was done during the maintenance building period of time starting with the opening day till the present days. It was calculated the energy demand for heating, cooling, ventilation and lightning systems depending on the average daily running hours and on the internal heat gains for each type of area destination (like...

The calculation program EnergoCost V.1 [8] was developed in order to choose a heating system that would generate minimal costs both in terms of initial investment and energy consumption over time. Thus, it is possible to determine the evolution in time of the energy costs for heating the building, using different energy sources and thermal devices. The results are displayed numerically but also graphically, being very intuitive, and any user of this program can easily interpret these results, choosing the final op...

The study focuses on saving energy in the process of drinking water distribution in the rural area. The hydraulic model of the water distribution network that supplies Dulcesti village, Constanta County, Romania, developed in EPANET is the basis to performing a thorough analyse of the hydraulic system?s operation. The standard hourly water demand is taken into account. The network is a branched one, widen on a large area so that the ratio is about 10m of pipe per inhabitant. The difference in junction elevation is...

The paper presents a method for calculating the amount of thermal energy which is required for heating buildings, by enlarged indicators: area, storeys, material of walls, the number of people in the building and the specifics of its operation. On the basis of analysis of results of energy audit conducted in 2012-2016 for municipal institutions in the Belgorod region, a statistical analysis was carried out and dependencies were obtained to determine the geometric characteristics of buildings needed for thermal eng...

Aim of this paper is to provide the overview of ecological friendly mechanical engineering through design solution in the field of material handling. There can be achieved a significant reducing of energy consumption with advantage of maintenance simplicity by decreasing level of the automation and the design complexity. Model situation is dealing with change of the material position orientation by using minimum of external forces and processes. The orientation change is induced by motion of the material along pre...

In many cases, the specific energy consumption indicators do not reflect the energy efficiency, since the amount of energy consumption is affected both by the technical condition and design of buildings and the specific use of energy, and specifics of its use and the proper organization (culture) energy consumption. The paper presents a generalized indicator of the energy efficiency of objects that have different purposes and are located in buildings with different technical conditions. The indicator contains two ...