RATIONAL ENERGY USE
High energy efficiency and good indoor air quality
Efficient use of existing building systems and technologies provides maximum comfort at low energy cost. The quality-to-price ratio is achieved through proper analysis and combination of architecture and building systems. The use of computational software for building energy simulations is the best option for this.
Active systems
Effectiveness at low energy consumption
Heat pump systems
High efficiency and lower costs
Heat pump systems can supply heating, domestic hot water and cooling of a building. Powered by electricity, these systems are highly efficient and can supply heating or cooling energy at drastically lower price compared to standard heating appliances. There are several types of heat pumps.
Heat pump systems types Installations for heating, cooling and domestic hot water
Heat pump "air"-"water"
Option, which is most affordable. Investment for it is financially most advantageous. It is also independent of the existence of geothermal water or terrain properties, which makes it preferable and easy for installation and control.
Heat pump "ground"-"water"
Closed geothermal system, which relies on the constant soil temperature after the second meter in depth and the heat exchange is performed by antifreeze, circulating in the ground loop (horizontal or vertical). Most effective type of heat pumps.
Heat pump "water"-"water"
System, which uses geothermal energy. It is an open system that is directly supplied by a source of underground water with a constant temperature - drilling, well, drainage water, etc.
Ventilation systems
Smart heating, cooling and ventilation
Ventilation systems can be used for heating, cooling and ventilation to provide good indoor climate in terms of СO2, air age and air humidity. Modern systems are equipped with heat exchangers, allowing the exhaust air to transmit its energy to the incoming air, which provides significant energy savings in heating or cooling mode.
Solar shading systems
Energy efficient measure, allowing personal control
Solar shading systems should provide sun protection mostly during summer, when its energy is not needed for heating a building. They can be controlled by schedule, internal temperature, solar radiation on glass surface, etc.
Passive measures Natural, free energy which can be used
In addition to the energy efficiency systems already listed (powered by electricity), it is also necessary to consider the passive measures (which do not require electrical energy) for heating, cooling and ventilation. Such may be:
Direct sun lignt (energy)
Direct sunlight penetrates the premises during winter and reduces the need for additional heating during the day.
Thermal mass
Thermal mass of the construction determines if it is possible energy to be accumulated which later can be released, contributing to energy savings from heating and cooling.
Orientation and building shape
These factors are important for optimal use of solar energy in the winter. The closer to sqare the plan of the building is, the less energy it would needs for heating and cooling.
Solar shading building elements
These are covers, balconies, blinds and other elements which are of such size, shape and location that allow the sun to penetrate during winter but protect from direct sunlight during summer, when the sun is high.
Combination of individual systems
Complementary solutions in construction
Effective use of energy is an objective that can only be achieved through complex solutions.
Combination of active and passive strategies is determined by energy design - computer analysis using software simulating the indoor climate and energy consumption of the building.
Strategies for design of one building The importance of reasonable design
Quality construction takes into account environmental factors and eliminates those that have a negative impact. What is the meaning of an efficient heating and cooling system if supplied energy "leaves" the building through thermal bridges that had to be avoided at the design stage? Following principles is important to be taken into account:
Good insulation properties
Good insulation properties of external building elements. Their U-value should be U ≤ 0.15 W/m²K. Current minimum requirements in Bulgaria are U = 0.28 W / m²K for walls, U = 0.40 W / m²K for floors and U = 0.25 W / m²K for roofs. Windows thermal transmittance coefficient should be ≤ 0.80 W/m²K (combined for glazing and frames) and glazing solar factor > 50%. Requirements in Bulgaria allow a thermal transmittance coefficient of U = 1.40 W / m²K.
Without thermal bridges
Without thermal bridges in the construction of the building. In Bulgarian building regulations, excessive losses of thermal bridges are allowed, which is contrary to the principles of energy efficient construction. The term refers to heat conducting connections in the construction and façade of a building through which the heat "leaks" moving in the direction to the smallest thermal resistance. Example: Well-insulated external wall is intersected by a non-insulated reinforced concrete slab. In the contact zone, a thermal bridge is formed through which the inner surface is cooled, i.e. heat is lost, and in addition to heat losses, condensation conditions are created and consequently there is a risk of mold inside the room.
Air-tightness of the building envelope
It is related to the inability of the outside air to infiltrate inside the building and vice versa. All the infiltration should be carried out by means of a ventilation system which allows its controlling, respectively controlling of heat losses.
Energy recovery from the building ventilation system
A high percentage of energy recovered by the ventilation system - should be over 80%. The efficiency of fans in the ventilation system should also be with a value of near ≤ 0.5 W/m³/h.
- 19 years of experience
QHome "The key to a better life"
Project for the complete construction of an innovative residential building in Vitosha district, "Prof. Georgi Zlatarski" street, Client: AKMI Ltd.
QHome "The key to a better life"
QHome is an energy-efficient residential project that offers a concept of living in harmony with nature. The project is distinguished by the use of a geothermal cooling and heating system, made possible by heat exchange with the ground. The technology, also called a ground source heat pump, provides savings on monthly utility bills of up to 60%.
With a built-up area of 4945m², including 55 homes and 55 parking spaces, and with its location in one of the most preferred areas of Sofia, QHome has the ambition to offer the standard we need to lead a better life.
THE MALL - "Tsarigradsko Shose" blvd.
Machine laid cement sanding screed and specialized construction works on the territory of Bulgaria's largest shopping center - THE MALL, "Tsarigradsko Shose" blvd.
THE MALL - "Tsarigradsko Shose" blvd.
Machine laid cement sanding screed and specialized construction works on the territory of Bulgaria's largest shopping center - THE MALL - "Tsarigradsko Shose" blvd.
"CITY-EURO" LTD is one of the main contractors of a machine layed cement-sand screed from tender for THE MALL - "Tsarigradsko Shose" blvd", namely: CARREFOUR, NEW YORKER, SPIDER, Marc O`Polo, ESPRIT, ZARA, PRETTY SHOP, MODESTAMENTE, HUMANIC, INTERSPORT, ADIDAS, PUMA, DOUGLAS, SEPHORA, BEAUTY ZONE, La Coste ect. In most of the commercial areas, as required by the investors, a cement-sand screed, significantly exceeding the technical characteristics of BDS National Standart for this type of construction product, was layed.
Change of purpose and reconstruction of a building, Slivnitsa
Investor: Municipality of Slivnitsa
Change of purpose and reconstruction of a maternity hospital to a Center for the elderly, regulated plot ІV, zone 8, Slivnitsa, Municipality of Slivnitsa
Contract 2007 CB16IPO006-2009-1-150 Establishment and development of social infrastructure (Budget line 6 Investments) by IPA Cross border Bulgaria – Serbia 2007-2013, Investor: Municipality of Slivnitsa
Two passive houses on a common plot, Gorna Banya quarter
Complete construction of two passive houses - an example of the higher standard in low-energy construction.
Two passive houses on a common plot, Gorna Banya quarter
Passive buildings have a high level of thermal insulation, a minimum of thermal bridges and low infiltration, to achieve which they use the heat inflows from solar energy and internal accumulation, as well as the recycling of the thermal energy of the air exhausted from the ventilation.
Residential and office buildings at "Vihren" str., Buxton
Residential and office buildings in regulated plot VII - 289, 256A, Pavlovo - Buxton, Investor: BUILD SYSTEMS BULGARIA Ltd.
Residential and office buildings at "Vihren" str., Buxton
Residential and office buildings in regulated plot VII - 289, 256A, Pavlovo - Buxton, Investor: BUILD SYSTEMS BULGARIA
"CITY-EURO" is a contractor of Roofing, waterproofing and tinsmith works, Cement screeds and pavements, Plumbing works and Thermal insulation and plaster on facades.
Q - center
Office building with trade area and underground garages - "Tsarigradsko Shose" blvd., 4-th kilometer, Investor: BUILD SYSTEMS BULGARIA Ltd
Q - center
Office building with trade area and underground garages - "Tsarigradsko Shose" blvd., 4-th kilometer, Investor: BUILD SYSTEMS BULGARIA Ltd.
Q-center project was a professional challenge, especially from a constructive point of view, because the mix of one main body and three low bodies is a combination of highly irregular in plan and high-rise buildings with very complex shape facades. This necessitated the building separation with seismic joints in four separate blocks and using a mixed structure of beams and columns composed of frames and reinforced concrete walls and cores.
The precise execution, the rhythmical and tight organization plus the saturation with sufficient equipment and qualified personnel led to the logical result - a timely and quality completion, regardless of the additional difficulty that was created by the location of the site: the roundabout on 4-th kilometer, "Tsarigradsko Shose" blvd. - the junction with one of the trafic in the capital.
First sod of QHome
On September 17, with an official opening, City Euro began the construction of QHome "The Key to a Better Life", the first residential building in Bulgaria certified according to the EDGE sustainable/green construction standard.
First sod of QHome
On September 17, with an official opening, City Euro began the construction of QHome "The Key to a Better Life", the first residential building in Bulgaria certified according to the EDGE sustainable/green construction standard.
After the traditional consecration, the construction site of the energy-efficient building, which will offer a concept of living in harmony with nature, was opened together with the contractors AKMI Ltd.
Futuristic aparthotel
Complete construction of a building in the center of Old Sofia, Bratya Miladinovi Street. Client: "Urban Stay" Ltd.
Futuristic aparthotel
Innovation and cutting-edge technology in every element of the building - from geothermal wells providing energy-efficient heating, cooling and air conditioning to smart-home systems for automating security, notification, access control and more. The interior itself is a whole new page in the interior design of spaces.
The aparthotel has an exceptional quality of workmanship, high class materials, equipment and the idea "less means more" in its most sophisticated implementation! CITY-EURO exceeded the expectations of the demanding foreign investor, so that future visitors can enjoy the undeniable advantages of a modern, extraordinary in design and function, building.
Residential area "BRIGHT LIGHT"
Complex of residential buildings "BRIGHT LIGHT" I and "BRIGNT LIGHT" II . Investor: BUILD SYSTEMS BULGARIA Ltd.
Residential area "BRIGHT LIGHT"
Complex of residential buildings "BRIGHT LIGHT" I and "BRIGNT LIGHT" II . Investor: BUILD SYSTEMS BULGARIA Ltd.
"CITY-EURO" is the main contractor of Roofing, waterproofing and tinsmith works, Thermal insulation and mineral plaster on facades, Cement mortars and pavements, Water and sewage works, Hydro and thermal insulation on balconies and terraces, floor screeds and concrete flooring.
- 40+ Finished projects