Citygate, Gothenburg, Sweden
Citygate is a new landmark in Gothenburg. With 36 floors and 144 meters in height, it’s the tallest commercial building in the Nordic region.
The Project
Citygate is a new landmark in Gothenburg. With 36 floors and 144 meters in height, it’s the tallest commercial building in the Nordic region. The building will accommodate offices, co-working spaces, conference facilities, a restaurant, various cafés, and an eco-green terrace. Construction of Citygate started in 2018, and the first tenants moved in during the summer of 2022.
The Hydronic Challenge
In a property of this size and height, the HVAC system must have the correct components to ensure efficiency and user comfort. The large heating and cooling systems experience significant pressure drops due to the long distribution lines. As a result, particular care must be taken when designing the system design. New commercial properties must meet high standards regarding energy consumption, indoor climate, and noise levels. This means that pressurisation and degassing equipment must meet the highest standards, and the valves installed must be able to direct the heating and cooling around the building in the most efficient manner possible.
The Solution
IMI trained the companies involved in designing and installing the HVAC system of Citygate. Our sales engineer supported the project group with suggestions about system design and the choice of hydronic solution.
Citygate is divided into multiple systems with heat exchangers, but the thermostatic heads must be installed at such heights that gases are a problem despite the division of multiple systems. A Transfero TV Connect was installed to guarantee the system’s proper functioning and longevity, ensuring proper vacuum degassing and optimal pressurisation. This solution will help avoid common problems such as lower power transfer, blocked valves, and noise.
The heating system was designed with differential pressure controllers to reduce the available pump pressure, improving the indoor climate and meeting the building’s noise requirements. The solution also makes the system more energy efficient.
The cooling system was designed with IMI’s HySelect software to run partial load simulations and optimise the main risers’ dimensions, saving materials, energy, and costs.
Cooling is distributed with active chilled beams, each equipped with a PIBCV (semi-independent balancing and control valve), maximising user flexibility in the building. The PIBCVs deliver effective flow control with low noise levels, even at high pump pressure. These PIBCVs were selected to meet the installation requirements and guarantee optimal functionality of the overall system. An additional benefit is easy balancing, as the flow is adjusted and measured at each valve.
The system solutions in the heating and cooling systems are part of IMI’s “Future-proof solutions” concept, designed to keep functioning optimally when renovating buildings.