Grijanjeinvest – Three decades of practice in design and construction of thermotechnical installations

Source: eKapija Thursday, 15.12.2022. 02:43
(Photo: Grijanjeinvest)
The company Grijanjeinvest was founded in Sarajevo in 1991. It was reestablished in 1995 in Pale and since then it has been steadily growing. Its main activities are design and construction of thermotechnical (HVAC) installations: air-conditioning, heating, ventilation and refrigeration.

In addition, the experts from Grijanjeinvest are providing consulting services in the areas of energy efficiency in buildings and industry, district heating, improving thermal comfort conditions for working and living...

Of all designed and performed thermotechnical installations (in hospitals, hotels, residential and industrial buildings) we put special emphasis on the reconstruction after the devastating fire at the Holy Monastery Hilandar on Mount Athos in Greece which is still ongoing, Together with the professor Branislav Zivkovic from the Faculty of Mechanical Engineering in Belgrade and companies "Simon" Valjevo and "MPG KGH" Belgrade, for more than 15 years we are trying to perform the repairs on the HVAC installations at the Hilandar in the best way possible.


Air conditioning is a branch of technology that is mainly associated with cooling the space where people live. However, air conditioning includes heating and cooling and ventilation, and is divided into comfort and industrial. Comfort air conditioning studies how to achieve satisfactory thermal comfort conditions for people`s work and stay indoors in a safe, environmentally friendly and energy efficient way. In addition, industrial air conditioning should enable the appropriate technological processes to run smoothly.


Thermal comfort conditions are: air temperature, average temperature of the surrounding surfaces, average air humidity, flow rate and indoor air quality.

In order to study and understand air-conditioning, above all, it is necessary to have basic knowledge of thermodynamics and fluid mechanics.


Of the total energy produced in the world, more than 40% is used in buildings, and the largest part of that consumption goes to heating, cooling and preparation of sanitary hot water. That is why it is very important to design KGH systems with devices that have as high as possible coefficients of utility of primary to final energy transformation. Automatic systems for internal temperature control are also important. It is known that if the temperature of the room is raised by 10C in the winter, about 6% more energy is consumed. If, during the summer, the temperature is kept lower than designed for each degree, even around 19% more energy is additionally consumed!

Recently, more and more surface heating systems are being designed: floor heating (it must not be used for cooling), wall heating and cooling. These systems enable the use of low-temperature, energy-efficient heat pumps that most often use heat from the outside air, but often from the ground or underground water. These systems are also very acceptable for architects because the mechanical installations are practically invisible. Depending on the need for cooling, only a few devices may be added to the room - a fan coil device, which makes it possible to cool the air to a lower temperature during the summer and extract moisture from the air.

An example of wall and floor heating installations in the showroom of a commercial building in the vicinity of Sarajevo:

(Photo: Grijanjeinvest)
(Photo: Grijanjeinvest)
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