The Kambanite Green Office Building is a new construction. It is designed as an office building, which consists of one underground floor and five above grade floors, designed as open office spaces. The parking lot, technical rooms and storage areas are located on the underground level. The ground floor consists of main entrance, service facilities, cafeteria and open type offices. The remaining floors have been designed as open office spaces at the request of the investor. Lifts, restrooms and other service facilities needed for the functionality of the offices are located in the core of the building. The necessary for the HVAC equipment spaces are located in the basement and on the roof of the building. The gross floor aea of the building is 10 330 m2.
The COMMISSIONING PROCESSES and the ENERGY MODEL are encompassing the following base building systems:
Heating. Building supply with hot water for heating and DHW is established via two gas/oil fired boilers. They are located on the roof of the building in two equipment rooms. Two oil tanks are provided for emergency operation of the boilers in the event of gas failure. The hot water system includes also two supply/return collectors, electronic pumps with a constant flow for the boilers, pumps with variable frequency drives for the secondary heating circuit and temperature controlled pumps for the DHW. The generated hot water is transported via two pipe heating distribution system to four pipe cassette ceiling fan coil units for the main lobby and to four pipe fan coil units for visible floor-wall mounting for the office spaces.
Air Conditioning. The cold water for the air conditioning of the building is established via two air cooled chillers for the first energy plant and two air cooled chillers for the second energy plant. The four chillers can operate also in a free-cooling mode. The cooling plant includes also four buffer tanks, expansion vessels, supply/return collectors and supply pumps with variable frequency drives. The cold water from the cooling plant is distributed to the building fan coil units. For the server rooms, UPS, and four technical rooms, the air conditioning is provided by direct expansion split system air conditioners.
Ventilation. The mechanical conditioning ventilation of the building is established by air handling units (AHU) with built in heat pumps. They are located in the suspended ceiling of each floor. Each AHU supplies one separate rental office unit with fresh air. Separate exhaust ventilation for the sanitary premises of the two blocks is installed.
Two exhaust ventilation systems for the servers, UPS and equipment rooms are provided. Separate ventilation systems for fresh air supply for the technical rooms and locker’s are provided. During the winter period the fresh air is heated in ductable heating section. In the summer period the fresh air is provided unconditioned. The exhaust ventilation and smoke extract ventilation for the garage is established via directing jet fans located in the garage and two main ventilators located above the garage level. In case of emergency operation of the ventilation system, the main and jet ventilators operate at maximum speed in order to provide 16-fold air exchange.
Domestic hot water system.
The DHW system is designed using the thermal potential of the chiller plant. The preparation of the DHW is organized as follows: 1. Preheating of the city water to 40OC by the chiller plant. 2. Reheating of the DHW up to 60OC during winter time by the boiler plant. During summer time when the boiler plant is not operating the reheating is established via two condensing boilers. An electrical heating element embedded in the storage tank provides reheating in case of boilers failure.
Automatic control system. Building automation system is envisaged as centralized hierarchy structure. The system consists of field equipment, DDC station and operator station and has the ability to be expanded in future.
The building management system is used for monitoring, regulation and control of the following systems: Generation and distribution of heating and cooling capacities (Heating/Cooling center); Heating and cooling of office areas; Heating and cooling of Lobby; Ventilation of the office areas; Ventilation of break rooms and restrooms; Garage ventilation; Emergency ventilation; Lighting; Energy metering
The interior lighting consists of luminescent main lighting with self-dimmed lights, standby lighting and emergency lighting. Interior lighting controls consist of light/motion sensors for the offices, motion sensors for the restrooms, switches and time scheduled BMS control for the other zones.