Dunte Office centre
|Name||Dunte Office centre|
|Building Owner||Investment company|
|Type of building||Office building|
|Use type||Shopping centre|
The opening ceremony of the spacious (floor space 19,000 sq m) office building Duntes Biroji Biznesam took place on 8 November 2007. Dunte Office centre offers Class A office spaces with high possibilities to adapt office spaces according to the individual client needs.
The building is located approximately 15 minutes from Riga city centre with good surrounding infrastructure. The standard heating season in Riga is 203 days long with an average temperature of 0 oC, which equates to about 4060 degree days. There are no specific determination on standard cooling days which could be used to benchmark cooling performance. Office centre is located in Riga, near the gulf of Riga and the elevation above sea level is about 10 m.
Building is operated as an office centre, which is its initial operation mode since the building was built. The calculated building energy consumption for heating is 104,9 kWh/m2.
The main aim of the project was to conduct an energy audit to ensure conformity with existing legislation. As a part of building energy audit, it was planned to carry out TMon to verify system operation according to desired specifications. Therefor initially planned main activities within TMon were:
- Evaluation of existing equipment and technical documentation;
- Additional measurements to acquire necessary data points;
- Evaluation of AHU technical performance.
|Building owner:||Investment company|
|Facility Management:||Facility Management company|
Building had been built in 2007. During this time no major renovation or system upgrade procedures were carried out and facility management company had changed. The building has BMS, from where main technical system operational parameters can be monitored and changed. However the current facility managers didn’t have access to the BMS data and during the whole duration of the project, the access to the BMS data was not granted, limiting possibility to fully carry out TMon. The technical documentation of BMS was detailed enough to determine technical details of different systems and subsystems. Additionally CO2 measurements and AHU energy consumption measurements were made to evaluate AHU operational parameters. It was concluded, that by reducing AHU system operational hours and performing slight adjustments to ventilation duct system, it would be possible to reduce AHU energy consumption.
Building’s technical equipment
|System/type||Power, source/fuel type, size, circuits …||Selected for QM-process|
|Heating||City centralised heating system||Yes|
|Hot water storage||No hot water storage||-||No|
|Cooling||Building centralized cooling unit and several split-type conditioning units||Space cooling |
Technical cooling for server rooms
|Ventilation||2 central devices||4 AHU units with combined supply fan power 60 kW||Yes|
|Cold source||Compression refrigeration machine for food refrigeration||Electricity||No|
|Lighting||LED, HID, CFL||Electricity||No|
|Electrical Supply||Power grid||Electricity||No|
Energy Performance (Evaluation of Savings)
|Baseline (kWh/a)||Savings (kWh/a)||%||Savings (kg/a)|
|Electricity for AHU||214680||22430||10,4||2444,87|
It was advised to gain access to the BMS data and, potentially, carry out full TMon, in order to identify weak points in the system. Taking into account, that system has been operational for more than 10 years and no deep analysis of the BMS during this time has been made, it is possible to say with high probability that there is high potential of system optimization.