TRIGENERATION
A high-efficiency trigeneration system has been installed for the buildings in the GPP BUSINESS PARK complex. This consists of combined heat and power (CHP) units which, while producing electricity, also produce heat. This heat is the primary source of heating for the buildings in winter and is converted into cooling in the absorption chillers in summer.
GAS HEAT PUMPS
The peak source of cooling in the GPP BUSINESS PARK buildings is provided by GHP gas appliances and a compressor unit. The GHP technology involves the use of a gas-powered internal combustion engine to drive a set of compressors operating in a highly efficient heat pump system with variable refrigerant flow. In the cooling mode, the heat generated during the operation of the engine is used entirely to heat domestic hot water.
CHILLED AND HEATED BEAM SYSTEM
Energy-efficient chilled and heated beams have been used in the buildings of the GPP BUSINESS PARK complex, which, due to their highly efficient and quiet operation, create an ideal environment for people to work and function in, improving their productivity and work comfort. The absorption of large heat yields by the chilled and heated beams is much more efficient than with air systems. An additional advantage of these systems is the even distribution of the set temperature and the wide range of possibilities for interior design. The large proportion of induction has a significant effect on increasing the comfort of the occupants. It must also be emphasised that an air-conditioning system based on cheated and heated beams makes it possible not only to cool rooms, but also to heat them.
HIGH-EFFICIENCY VENTILATION SYSTEM
A high-efficiency ventilation system ensures that the air is dehumidified and humidified to an optimum level of 40-60%. High-efficiency hygroscopic heat/cold exchangers were used to minimise energy requirements. The chilled and heated beams, on the other hand, provide as much as 36 m3/h/person of fresh purified air.
VARIABLE ARI VOLUME CONTROLLERS (VAV)
The advantage of using variable air volume (VAV) controllers is the use of less energy that is necessary to prepare the supply air with the appropriate parameters. In relation to a constant-flow system, it is possible to supply the required quantities of air to selected rooms/zones at any given time. The parameters that determine the volume of air supplied are heat gains (temperature) and CO2 concentration. The main components of the VAV system are the flow controllers. They have a control function - on the basis of an external signal, they adjust the quantity of air flowing in the ventilation ducts.
AIR HUMIDIFIERS
GPP BUSINESS PARK buildings use adiabatic air humidifiers characterised by low energy demand when compared to conventional steam solutions. The water that feeds the humidifiers is free of all microorganisms, bacteria and viruses in the process of reverse osmosis. Additionally, a silver ion dosing system is used to prevent the growth of microorganisms in the water used to humidify the ventilation air.
FREECOOLING
Night cooling is one of the ways to reduce the cooling demand in a building. The outside air supplied by the mechanical ventilation system during the night period, reduces the cooling demand by collecting the heat gains accumulated in the building elements. Also, thanks to high-parameter cooling in the induction beams, the refrigerant is prepared in the frecooling chiller already at an outdoor temperature of 14 degree C.
LIFTS FOR ENERGY RECOVERY
The lifts in the GPP BUSINESS PARK buildings are equipped with an electricity recovery drive, i.e. they not only consume electricity, but also produce it and return it in a clean form to the building's electrical grid. Electricity is produced not only when the lifts are moving upwards with a light load, but also when they are moving downwards with a heavy load. The higher the traffic volume of the lifts, the greater the efficiency of the electricity recovery system.
WEATHER STATIONS
The weather stations used in the GPP BUSINESS PARK buildings communicate with the energy-efficient lighting system, thus optimising energy consumption for lighting.
BMS
GPP BUSINESS PARK buildings use an optimised, proprietary BMS system which, by improving the hierarchy of available sources and by placing the lighting and ventilation control elements within the office space in a single network, allows energy efficiency to be increased. The building automation system continuously monitors comfort and external parameters and controls the relevant sources accordingly. The algorithm is based not only on maintaining comfort, but also on ensuring maximum energy efficiency of the implemented systems.
ENERGY SECURITY OF THE BUILDINGS AND THEIR TENANTS
Not only are the buildings of the GPP BUSINESS PARK complex connected to the electricity grid, but they also have primary and backup power supply from two independent main power supply points. The buildings can also produce electricity themselves using cogeneration and PV installations.
The HVAC system used in the GPP BUSINESS PARK buildings provides a multiplicity of sources, the use of which in a given situation depends on external parameters including, but not limited to, external temperature, humidity and the response of the control system (room heat gains, humidity gains, CO2 content or heat losses).