CONDITIONS FOR ACHIEVING MAXIMUM RESULTS
A number of solutions for a better quality at home life
The indoor climate in each building should be considered at design stage. Only then, it will be possible to achieve optimal comfort that positively affects both the health of the people in the building and their sensations and productivity. For optimal comfort, the following parameters must be within specified limits.
Ensuring good indoor climate
Achieving a healthy and pleasant indoor environment
According to European Standards, the indoor climate parameters have a direct relation to the energy consumption of a building. "If the occupants feel uncomfortable, they are likely to take action to improve their comfort, which can lead to changes in energy consumption", is written in EN 15251, where the parameters for indoor air climate are determined.
- Operative temperature
- 22±2°С during winter and 24±2°С during summer
- Levels of СO2
- up to 900ppm (ppm - parts per million when outside values are 400ppm)
- Humidity
- from 25% to 60%
- Day light
- ≥ 2% from the outside illuminance in the middle of a room
- Air age (infiltration)
- < 2h (0.6 air changes per hour)
Achieving optimal comfort Measures for improveing indoor climate quality
Optimal comfort of a building can only be achieved if it is taken into account when designing it. With standard construction practice in Bulgaria, optimal comfort is not achieved by itself. In order to be achieved, people install additional appliances that only improve the quality of the indoor climate to a certain extent, but by using more energy. It would be far cheaper and healthier if in project are foreseen passive (not requiring energy) and active (energy-requiring) measures.
Temperature
Heating/cooling systems and building insulation play a key role in achieving required temperature comfort. Energy-efficient buildings are designed so that these systems are only used in case of very low outdoor temperatures. Most of the time during winter period the heat comes from occupants, appliances and lighting used in the building.
Humidity
Humidity inside a building affects health and comfort of its occupants. Optimal values of this indicator and non-admission of moisture in the building structure are best regulated by a ventilation system. It reduces humidity when is too high or increases it when is too low.
СО2
It is necessary mechanical ventilation to be provided for ensuring the extraction of the "dirty" indoor air and replacing it with a fresh one, rich in oxygen. When using mechanical ventilation system, fresh air is filtered so as to avoid external pollutants, which is especially important for people with respiratory problems and allergies.
Daylight
The daylight in a building depends on size of the glazing, its location and shading. Daylight is largely related to the Sun heat that remains inside the building. Therefore, energy analysis should determine density and types of glazing as well as sun protection for protecting the building from overheating during summer, but allowing warming it up during winter.
Infiltration
Thanks to the ventilation systems, odors and pollutants are extracted so that they do not affect comfort and health of people.
Maintaining of parameters
Determining the best conditions
Maintaining the optimal values of these parameters, at low energy consumption cost, is possible if it is taken into account at the design stage of the building. Once set, the desired values are automatically controlled, which does not exclude the possibility of changing them according to the customer's needs or atmospheric anomalies.
Symptoms of bad indoor air quality
Human's health, comfort and productivity
Indoor air quality directly affects human's health, comfort and productivity. Most common health problems caused by bad indoor climate are allergies, asthma (caused mostly by moisture and mold), infectious diseases that spread through the air.
Temperature
Architectural and engineering decisions for a building affect the health and well-being of the future occupants. We often do not realize that a number of health problems are caused by inappropriate heating, cooling, ventilation and isolation. People realize that floor heating is one of the most efficient and comfortable methods of heating the building. It provides a uniform distribution of air temperature in a room, unlike other types of heating, where the warmest is high, at the ceiling, and the coldest is low, at the floor. Floor heating systems are silent. Another advantage is that the area of dusting lowers its borders and is always 15-20 cm from the floor.
CO2
High levels of CO2 are perhaps the most widespread expression of poor indoor climate in buildings in Bulgaria due to the lack of adequate ventilation. In most buildings, it is done by fans in the bathrooms and by manually opening of windows, which is extremely inadequate, especially in the winter months. It has been proven that the high values of СО2 cause a feeling of tiredness and can reduce productivity with up to 15%, which is particularly important for offices, administrative buildings, schools and kindergartens. For example, in a bedroom occupied by two persons, CO2 levels at night may reach values of over 4000 ppm at recommended 900 ppm. This directly affects the quality of sleep, respectively of working capacity. In addition, with the exhaust of CO 2, water vapor is released, which by penetration into the structure can cause formation of mold.
- 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