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Modern buildings require energy-efficient heating and cooling method for the both parts of the system, the heating/cooling source and the heating/cooling distribution system. Modern heating and cooling systems typically combine a reversible heat pump with a low temperature radiant system. Thermally activated building systems (TABS) use the large thermal mass of concrete from building structure as a buffer for lowering the cooling and heating loads during the day. In this paper we illustrate the floor covering infl...

This paper provides a comparative study of the energy consumption and energy efficiency of a HVAC system with three configurations. This system was used to cool an experimental room in an office building in more control scenarios realized by adopting different cooled water temperatures and chiller cooling systems. It is proposed an air?water mist cooled system for an air-cooled chiller. The three configurations of the HVAC system have the following configurations: (1) air handling unit (AHU) and fan-coil units (FC...

There is a significant number of historical buildings with different destinations in Romania and all of these are yet dealing with major problems in terms of energy efficiency. The legal status of these buildings involves various restrictions concerning solutions that might be applied in order to ensure its? energy efficiency. Therefore, applying the classic solutions to maintain the thermal comfort within patrimony buildings becomes very hard to accomplish or even impossible in some cases. The purpose of the stud...

The case study analyzed in the paper refers to a group of new buildings built near the campus of the University Politehnica of Bucharest. The University?s campus has its own cogeneration power plant equipped with two reciprocating engines using natural gas. Each engine generates 800 kWe of electricity for University?s own consumption and for selling it on electricity market. During the winter time the heat recovered from the two engines, is used within the district heating network of the University?s campus. Durin...

Being an inland city, Moscow is anyway vulnerable to extreme weather, in the form of heatwaves and very cold weather, storm and heavy rains. Without action, further climate change, Moscow?s population growth, and other challenges will increase the risk of severe impacts. Preparing for extreme weather and further climate change is about managing risks and increasing our city resilience to them ? it is therefore as much about the economy, quality of life and social equality, as about the environment. Moscow started ...

This article is referring to a short study regarding the energy efficiency status in retail industry in Romania, in particular an analysis of the big sizes commercial buildings in this matter. It contains data which will allow us to compare an existing building with the industry norms in terms of the energy consumption and energy costs. Additionally, there are some recommendations provided to be taken care of in the near future for controlling energy better, using energy in a more efficient way and reducing avoida...

The calculated energy efficiency and specified physical properties of building materials may change significantly during the initial years of a building?s operation under real climatic conditions. Five small test buildings with different wall assemblies were built in Riga, Latvia to compare different building construction characteristics under Latvian climate conditions. The heating energy consumption, thermal transmittance, air relative humidity and other important energy efficiency and environmental parameters h...

This paper provides a comparative study of the energy consumption and energy efficiency of a HVAC system with three configurations. This system was used to cool an experimental room in an office building in more control scenarios realized by adopting different cooled water temperatures and chiller cooling systems. It is proposed an air?water mist cooled system for an air-cooled chiller. The three configurations of the HVAC system have the following configurations: (1) air handling unit (AHU) and fan-coil units (FC...

Current research directions in the field of both architecture and constructions are aimed towards satisfying the user?s need in an ever-growing context that is struggling to drastically reduce energy consumption related to buildings. When designing housing units, that are always changing and evolving, it is imperative to consider developing a building envelope which seamlessly adapts to its surrounding climate conditions, so that exploiting and maintenance costs can be reduced according to the user?s financial sit...

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...

Historical buildings are a major part of European and national cultural heritage which people all around the world decided should be preserved for the future. In order to conserve both the construction elements and the thermal comfort, it is crucial to find the optimal configuration of the energy related equipment. These units, besides fulfilling the parameters of thermal comfort, are also subject to the EU Ecodesign and energy labeling requirements and must meet a series of architectural restrictions. This articl...

The basic tasks of building and production sphere, housing and communal services are connected with life protection and comfortable conditions creations for people. In this way the automated control systems of distributed energy supply and life support facilities play an important part. The main scientific direction in this area is increasing their energy efficiency. Paper represents results of implementation of automated dispatch control systems of distributed energy supply and life support facilities that includ...

This study aimed to assess the potential of renewable energy resources in Romania and the potential of distorting the energy resources consumption. In this respect, the authors compared the status of Romania with the status of two other countries, Estonia and Croatia, selected as their development of resource use productivity compared with the GDP expressed in euros, with 2010 as the reference year, is the closest to the growth Romania saw in 2000-2015. By considering, as measures, the average GDP in constant pric...

Lowering energy consumption in the residential sector is one of the main priorities in the European Union. This can be achieved by increasing the thermal insulation of the buildings and using renewable sources for energy. One of the most common solutions is the use of heat pumps to produce thermal energy for heating / cooling indoor spaces and for domestic hot water. The geothermal heat pumps are used, but with increased efficiency of air/water heat pumps, they become effective solutions. This work studies the eff...

Construction of green buildings has become a kind of global trend, but its implementation varies greatly by country and region, including the rate of growth in green involvement, triggers and obstacles impacting their growth. Green buildings gives to the forefront of energy efficiency also the impact of buildings on the environment, the environmental burden through production of raw materials and the impact of buildings on the whole region. Green building is therefore designed, built and operated also with regard ...

The concept of energy efficiency is applied in the context of efficient use of energy materials and media in various stages of production, transmission, distribution and energy consumption. Implementation of the principles of energy efficiency in practice is taking action, whether producers or consumers of energy, resulting in the reduction of energy consumption per unit of output without reducing the level or quality of services consumed. Buildings form a basic pillar of smart cities concept where all life proces...

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 ...