SERBIAN CENTER FOR ENERGY EFFICIENCY

OFFERS SOLUTION HOW TO ACHIEVE SAVINGS THROUGH SPECIFIC PROJECTS THROUGH!

Energy efficiency in the construction industry

Analysis of energy needs for heating objects are made based on the designed value of specific installed capacity. Energy efficiency of buildings depends on the thermal properties of its wrapper, actually from material that walls and windows are made of and sealing of all openings in the facades of the building.

Analysis and study of energy efficiency in buildings in which all buildings, residential, public and industrial, were included, in Belgrade and other cities in Serbia, showed that 50% of the total energy needs goes on heating, air conditioning and domestic hot water.

Approximet analysis proved that interventions on existing buildings, such as their energy revitalization and subsequent adjustment to energy efficiency standards and environmental requirements, can diminish energy consumption for heating for 20 - 40%, on average.

To achieve preferred energy efficiency standards in buildings we need to focus on the rehabilitation of existing buildings, which are in the majority, and we have to designed new ones, which are envisaged for construction, so that buildings are maximally energy efficient in accordance with today's technical and technological capabilities.

With reconstruction of old buildings by replacing windows or increasing the thermal resistance of existing windows, or by sealing windows, or by additional isolating of walls and roofs, we can reduce energy consumption and decrease it to a minimum.

This includes investments that will pay off very quickly, by reduction of energy expenses.

Why rational use of energy and increase energy efficiency is important for Serbia ?

Decrease of import of expensive liquid and gas fuels - financial savings
Reduction in investments in new power plants
More efficient use of constructed power plants
Modernization of technology
Use of local energy resources
Reducing emissions of CO, SO2, NOx and particles
Security of supply of important consumers
Greater competitiveness of the economy on the international market

THE MOST COMMON MEASURES THAT ARE TAKEN TO REDUCE ENERGY LOSSES AND INCREASE OF EFFICIENCY OF ENERGY ARE:

Replacement of non-renewable resources with renewable
Replacement of non-efficient consumers with energy-efficient consumers
Insulation of spaces that are heated
Replacement of friable joinery in spaces that are heated
Installation of measuring and control devices on energy consumers

Energy efficient buildings

In defining project requirements for constuction of affordable, long-term, energy efficient and ecological living space and in order to the realization of constuction of energy efficient buildings for industial, administative and social purposes, it is necessary to pay special attention not only to choice of building material but also to selection of building systems as a whole, which meet a series of demands of modern consturction.

THE GREATEST ENERGY LOSS IN BUILDINGS IS THROUGH THE WALLS OF UNINSULATED BUILDINGS AND TRHOUGHT INADEQUATE WINDOWS. OVER 80% OF BUILFIND IN SERBI DON'T HAVE THERMAL INSULATION OF THE FACADE AND THEREFORE THEY ARE LARGE WASTEFUL ENERGY CONSUMERS. SAVING UP TO 50% OF ENERGY CAN BE ACHIEVED BY SETTING FACEDE INSULATION, REPLACING WINDOWS AND UPGRADING THE HEATING SYSTEM.

LOW ENERGY HOUSE

Low energy house is the one who consumed less energy than the ordinary one. Usually, those houses have high quality of insulation, adequate windows, good thermal isolation so that the result is lower energy consumed for heating and cooling. Sometimes they are equipped with solar collectors, technologies for recycling heat from the water used for showering or washing dishes…

There is no globally accepted definition of low energy houses. Due to the large variation in national standards, low-energy houses formed by standards of one country may not be low-energy houses by standards of another.

PASSIVE HOUSE, ULTRA - LOW ENERGY HOUSE

Passive house is a house that consumes very little energy so it is possible to live in it without a traditional heating system. The need for energy for cooling and heating does not exceed 15 kWh / m2 per year. Total energy consumption (energy for heating and cooling, for hot water and electricity) must not be greater than 42 kWh / m2 per year. This is about 10 times less than conventional buildings.

The cost of building a passive house in the past was much higher than the cost of building a traditional house, but with the development of technology and increasing demand for specially designed construction components, cost of construction is now much lower than it was.

ZERO-ENERGY HOUSE OR NET ZERO ENERGY HOUSE

A house with zero energy consumption and zero emissions of carbon dioxide in a year is called a zero-energy house. Zero energy consumption means that the zero-energy house could be independent of the energy network, but in practice this means that in some periods energy is received from the energy grid and in other periods energy is returned to the power grid.

Zero energy houses are interesting in the aspect of environmental protection because they emit very little of gases that cause the greenhouse effect. Zero energy house is an object that all its energy needs obtained only by using solar energy, wind energy and / or using geothermal resources, with high-quality thermal insulation. This house distribute excess energy during summer, while in winter it takes energy from the environment and thus its annual energy balance is zero. This houses are, usually, very well insulated and don't have a traditional heating system, in cloudy and cold days they use energy from "heat reservoir". Zero energy houses are interesting in the aspect of environmental protection because they release small amount of gases that cause the greenhouse effect.

AUTONOMOUS BUILDING, HOUSE WITH NO BILLS

Autonomous (independent) house is designed to function independently from infrastructural support. Therefore, there are no connections to the grid for electricity distribution, water supply, sewerage, PTT network ... Autonomous house is much more than energy efficient house.

Independence achieved by integrating all renewable and ecological systems and usage of solar energy, as well as the application of bioclimatic and thermodynamic principles of functioning structures of the building. This kind of structures are not connected to the public network, and any excess energy produced is mostly used directly and kept for use in the winter months, through the energy system of reservoirs and accumulators.

ENERGY PLUS HOUSE

Enery plus house is the house that produces more energy, using renewable sources of energy, than it takes from the external system, during the year, on average. This is achieved by using renewable energy sources, small power generators, excellent insulation, low-energy building techniques, such as passive solar home design, careful choice of location for the house, ect. These houses can provide steady income to their owners, if the owner has a contract for sale excess energy to distribution house.