Eng. Konstantinov, the correct choice of air conditioning and ventilation systems is of paramount importance for achieving optimal microclimate in modern societies. What approach do you use in your professional activity?

- The market is full of modern products and technological solutions for the construction of HVAC systems, which need to be used in the most efficient way. That's why "Termosyst" uses the so-called system engineering, with full responsibility for the correct functioning of the air conditioning and ventilation systems and the achievement of full control. We achieve this by using DAIKIN's most innovative technologies (VRV and НYDRОNІС), ensuring quality, reliability and installation. With its 25 years of experience in the design, delivery and installation of this type of air conditioning system, our company is an undisputed leader in the branch and already has 1,200 installed units. "Termosyst" implements the HVAC systems of Offices 1 and 2 of the large-scale Garitage Park complex, which will be certified by BREEAM. 

What innovative solutions do you propose for providing air conditioning to future users?

- It makes a great honour to do investors of Garіtage Rark, that during the tender procedures the HVAC systems of office buildings 1 and 1 they have admitted the participating companies to to offer alternative engineering solutions, supported by a qualified list of successfully implemented projects. On the basis of BIM design with visual modeling of the installation system in the building was offered a high-tech solution with a proven inverter temperature – DAIKIN VRV IV Heat Recovery. it is combined with hydraulic modules for utilization of the waste heat energy for production of hot (high temperature - up to 750C, and low temperature - up to 550C) water, and in the summer with water transfer. This are the so-called modular tubular air conditioning systems, which allow to specify the microclimate in any point of the buildings according to the needs of the individual users, without having to switch to heating or cooling mode.

The excellent technological capabilities of the VRV IV system allow three remote facades to be built with one machine per floor, which is a slight reduction. In addition, in combination with VRT evolutionary technology (variable refrigerant temperature), it provides an additional 28% economy in the process.

The modular principle is also developed in the ventilation systems of office buildings 1 and 2. The solution is possible in the best way – with enthalpy heat exchangers, which combine "recuperation - heat transfer" with moisture transfer. They are small and compact, with low energy costs, and very suitable for large work spaces. Their use prevents sighing. Their installation does not require the presence of machine halls, as it is performed directly on the suspended ceiling by means of small air duct supply systems integrated in the VRV IV systems. With the application of this type of modular ventilation systems, it is not necessary to make large verticals in the building for access to a certain amount of air from the floor, and to the point of failure.

The construction of the ventilation systems in the office buildings of Garitage Park requires a fast and technological method for their easy installation. For this purpose, Termosyst is connected with the Swedish company Lindab - a leading manufacturer and supplier of elements for air systems, for the application for this project. The system is on the principle of "lego assembly" and responds to the highest standards for tightness - class D. In our production base in Plovdiv is already installed the first computer machine in our country for the production of spirally wound air ducts from strip steel, with the ability to cut to size and compatibility with Safe Click systems. The advantage is that they are pre-prepared and can be mounted directly on the respective object. The water-based systems are supported by 3D schemes with printed codes of the location of each element and the technical quantity. For the purpose of the assembly process with a computer ethics system, the separate parts of the air ducts are marked. It is not necessary to cut the spirally wound air ducts on the site to match the required installation length. We have the capacity to fulfil orders of other installation companies, and this new product will make it easier for them both in the speed and accuracy of installation, and for buying air ducts of the required length without paying for waste.

In some functional units of the complex (gym, swimming pool, fitness) will be installed air-conditioning plants of DAIKIN, which allow precise maintenance of the supply air temperature based on heat carrier of "hot" and "cold" water. In the underground garages, a ventilation system will be installed on the base of the "jet" fans, mounted on the ceiling, ie. without air ducts. The system is developed through computer simulation in two modes: normal and with the included remote installation.

For the comfort in the reception floor of the building, as well as the entrance spaces in the underground garages, underfloor heating is provided on the base. This is a very efficient system for heating of high rooms.

Before starting the installation of all engineering networks, Termosyst undertook the difficult task of coordinating all installation systems in office buildings in a 3D environment in order to eliminate conflict points during their installation.

As a summary, I can point out that in terms of air conditioning and ventilation systems of office buildings 1 and 2 of Garitage Park we have achieved a very high technological level, thanks to the innovative solutions for precise control of the microclimate and minimization of the energy costs, fully in line with the global trends for such a high class of occupancy of sites and covering the high requirements of the tenants.