- Building Type : Office building < 28m
- Construction Year : 2012
- Delivery year : 2013
- Address 1 - street : 065001 LANGFANG, Other countries
- Climate zone : [ET] Tundra - Polar tundra, no true summer.
- Net Floor Area : 2 000 m2
- Construction/refurbishment cost : 1 714 285 €
- Cost/m2 : 857.14 €/m2
Primary energy need :
(Calculation method : Other )
VELUX Langfang Office is the headquarters of VELUX China. Located in the Hebei province, around 45 kilometers from Beijing, the building houses management, marketing and the technical department and sales division.
The two-storey building, with slopping walls and in the shape of a pyramid with cut-out top, is the workplace of 54 employees. They enjoy a range of facilities on the company site, which is shared with the nearby VELUX window factory.
The office was completed in June 2013. It has significantly lower energy consumption than standard Chinese office building.
The new Velux office in Langfang has been designed and built to meet several objectives:
· A real estate objective:
- Consolidate the operations on a single site (2 sites before)
- Being a showcase of the Velux products
- Show the commitment of the Danish company to sustainability and low carbon corporate policy.
· An economical objective:
- The operation must be neutral: the construction and operation costs are paid back by the saved rent
- Controlled construction cost in order to replicate the model in the Chinese market.
· An environmental objective:
- Reach a target value of 40 KWh/m²/year (excluding office equipment), and 55 kWh/m²/year (including office equipment) of final energy consumption (2020 Danish thermal regulations)
- Having a great indoor environmental quality: The VELUX Langfang Office aims to show that we can improve working conditions with minimum environmental impact
Thermal consultancy agencyTerao email@example.com Energy modeling, building envelope optimization, design of HVAC systems and associated controls
DesignerVelux firstname.lastname@example.org Design of the facades and daylighting optimization
Owner approach of sustainability
The Velux group is deeply involved worldwide in sustainability. They are engaged with stakeholders in the building industry, initiating experiments, developping affordable and sustainable concepts, building demonstration offices and houses, developing products that are energy efficient and have a positive CO2 footprint, and being exemplary by significantly reducing their energy consumption and CO2 footprint.
VELUX Langfang Office was intended to be a showcase for optimal indoor climate, energy efficiency, daylight and natural ventilation. This objective required engineering ingenuity as well as architectural experience.
This building achieves the right balance between passive solar heating in winter, solar shading in the summer, daylight harvest and natural ventilation.
The trapezoid shape offers a more dynamic look than most offices towers, and it creates a better inflow of light through the roof windows.
- 170,00 kWhpe/m2.year
- 370,00 kWhpe/m2.year
- 55,00 kWhfe/m2.year
- 0,60 W.m-2.K-1
- 0,80 none
Real final energy consumption
- Geothermal heat pump
- Low temperature floor heating
- Radiant ceiling
- VAV System
- Solar Thermal
- Water chiller
- Geothermal heat pump
- VAV Syst. (Variable Air Volume system)
- Floor cooling
- Radiant ceiling
- Natural ventilation
- Double flow heat exchanger
- Solar Thermal
- Heat pump (geothermal)
- 6,00 %
- 10,20 KgCO2/m2/year
- 463,00 KgCO2 /m2
- 50,00 year(s)
- 1 436,70 KgCO2 /m2
Life Cycle Analysis
- 3 265 357,00 kWhEP
- 119,00 m3
Indoor Air quality
Health & Comfort
The project participates in the NZEB and Health and Comfort contests because:
- It yields very high energy efficiency, especially if we consider the double challenge of achieving Denmark 2020 energy performance threshold in China and in a climate zone where both winter (-10°C with siberian Wind) and summer (40°C humid) are hard.
- The building has achieved the expected energy performance in real life after a careful M&V period of two years
- The building achieves a good ratio of renewable energy rate with the contribution of Ground Source Heat Pump and Building Integrated Solar Thermal systems (although it was not designed to reach NZEB at this stage but there is a potential of coupling the project with cogeneration based on the wood waste from the window factory on site)
- The building design was focused around the objective of energy performance. Not only the envelope is very efficient but the HVAC systems are well combined, a proper mix between efficient technologies and innovation. We must mention that combining VAV dedicated outdoor air system, radiant slabs/ceilings based on extreme thermal mass effect and ground source heat pump was a challenge in China and a lot of effort has been put on the integration of systems and on quality insurance. Lastly the BMS has been carefully designed and defined to just meet the need (no extra/unnecessary functions, the priority has been given to the use)
- The building also aims at very good comfort level. The target comfort and indoor air quality level have been defined as per CEN recommendation report 1752:1999 Class B
- Fresh air rate has been increased by 30% compared to the above mentioned Baseline both in order to improve IAQ and to meet comfort zone. Indeed the project is so efficient that only preconditionned fresh air is required to meet comfort. This is also possible thanks to the principle of TABS (Thermally Active Building Slab) that make best use of thermal mass
- Comfort and Health is also ensured by an abundant daylight. One can say that Velux has designed the architecture of the project around daylight, that it is the DNA of the building. As a result indoor spaces are very pleasant. Daylight and views on outdoor space (large green spaces with "happy farm" concept are visible from one side of the building) are known to be important factors for workers well-being.