Gruvgatan 6-8

Gruvgatan 6-8

Energy Consumption Reduction
CO2 reductions
Capital Expenditure
Savings on operating expenses
Payback period
Fast facts:
  • Location: Gothenburg, Sweden
  • Sector: Office
  • Floor area: 10.000 m2
  • Energy system: Integrated energy system with Borehole Thermal Energy Storage (BTES)
  • Boreholes: 14 boreholes x 300m depth
  • Heating Capacity: 300 kW (100% of demand)
  • Heating Delivery: 600 MWh/year
  • Cooling Capacity: 300 kW (100% of demand)
  • Cooling Delivery: 200 MWh/year
  • Energy reduction: 75% reduction in annual energy consumption

Project overview:

Energy Machines is proud to be the turnkey energy solution provider for Gruvgatan 6-8, a 10,000 m2 office property in Gothenburg, Sweden. The 1950s property consists of two buildings owned by Wallenstam AB. Over the past few years, Energy Machines has closely collaborated with Wallenstam to continuously upgrade the property's entire energy system.

The process began with a demand analysis to optimize the system solution. Next, the property's existing air handling units were replaced with ClimateMachines high-efficiency units for improved energy efficiency. These air handling units operate at 90% efficiency for waste heat recovery with zero cross-contamination, resulting in significantly reduced energy and peak power demands. For reference, typical AHUs with zero cross-contamination operate at around 50-60% efficiency.

During the final phase, the property's existing gas boiler is being replaced with an Energy Machines™ Borehole Thermal Energy Storage (BTES) system. With BTES, the ground is used as a highly efficient medium to store energy. During the summer, heat moves from the buildings to the ground storage via an Energy Machines™ heat pump, thus cooling the buildings. Come winter, this stored heat is transferred up to the buildings, providing tenants and visitors with sustainable heating.

Upon completion of the project, Gruvgatan 6-8 will be heated and cooled with 100% renewable energy sourced from the ground and waste heat from everyday operations inside the building. An Energy Machines™ heat pump, controlled by our flexible software control system, will move heat between the geothermal ground storage and the building as needed throughout the year, eliminating the burning of 16,000 m3 of gas per year and resulting in a 75% reduction in total energy consumption.

As the project nears completion around Fall 2024, we are excited to witness the tangible impact of Energy Machines' efforts in reducing carbon emissions, improving energy efficiency, and creating a more sustainable future for Wallenstam and the broader community in Gothenburg.

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