Using buildings thermal storage capacity to lower energy use

using thermal storage capacity at chalmers university

Using the buildings thermal storage capacity trough systems that optimises, heating, cooling and ventilation is a technical solution with verifiable and positive results. Ecopilot has the potential to substantially lower energy use in the built environment.

Chalmers Real Estate is the property company of Chalmers Technical University. Its main objective is to make the Chalmers campus a world leading science campus, with the smallest possible ecological footprint. The goal is to create a globally attractive, sustainable site for people and meetings.

The company has two campus sites, Johanneberg and Linholmen, both situated in Gothenburg on the west coast of Sweden. The buildings in the two campus sites are mainly modern offices, lecture theatres and workshops.

The size and the varied use of the buildings for activities such as material testing labs with climate chambers and gymnastic halls for student leisure, makes for a challenging task in the daily routine of the operations team. It also makes installing technical systems a very complex procedure, since indoor climate requirements can differ substantially within and across the portfolio.

Challenges and Actions

Chalmers Real Estate works with the explicit aim of being a pioneer in developing, building and managing a sustainable future. Although Chalmers is a real estate company, they are also a form of testing lab, in which they use their own properties to try out new technologies that could contribute to improving energy efficiency.

This pioneering approach led Chalmers Real Estate to install Ecopilot in their Kuggen building in 2014. Kuggen, which is a new landmark property at the Lindholmen campus in Gothenburg harbour, was an energy efficient building prior to the installation of Ecopilot, with a Green Building classification. The building had a modern building management system which controlled the heating, cooling and ventilation equipment. The original BMS did not take the building’s thermal storage capacity into account, which is a considerable asset in a modern concrete structure such as this.

Ecopilot was installed as an energy optimising module, to enhance the existing BMS. Ecopilot gives the existing BMS new set points for heating, cooling and ventilation based on Kuggen’s thermal storage capacity, variable internal load and weather conditions, both present and future.

Lessons and Results

“We use Ecopilot in properties that are already energy efficient, but we still see very clear results”

As part of the verification process, Chalmers used the independent consulting firm CIT Energy Management to verify the expected savings from Ecopilot. The measured and verified results by CIT confirmed savings of 50% on heating, 67% on cooling and 26% on electricity for operations. The indoor climate was surveyed before and after the installation and despite the enviable energy reductions Kuggen personnel could feel no negative difference in the indoor climate.

CIT’s conclusion from their assessment of Kuggen, was that using the buildings thermal storage capacity trough systems that optimizes, heating, cooling and ventilation is a “technical solution with verifiable and positive results. The solution, implemented on a larger scale, has the potential to substantially lower energy use in the built environment.”

Client Observations

Ecopilot is being installed in buildings that are already considered to be energy efficient. In a sense, Ecopilot is the crowning achievement. If we look at the Kuggen property, the savings on heating were around 50 percent. Admittedly, some of the savings can be attributed to other factors, but Ecopilot is responsible for the majority of the savings, and that is a remarkably high figure in a building that is already energy efficient.

We chose to try Ecopilot for two main reasons.
1. We’re generally interested in the development of new automation and control engineering
2. The opportunity to demonstrate Ecopilot’s features and benefits.

The possibilities of effectively using a building’s own capacity to store and utilise heat in the joists, felt particularly interesting. Given that our premises need both heating and cooling, we found that Ecopilot matched our needs very well. It is the only comprehensive system that controls both heating and cooling in this way. Historically, heating control has often been very primitive, but today there are far better solutions, of which Ecopilot is a clear example” Bengt Bergsten, Energy Strategist at Chalmers Real Estate

Come and meet the Ecopilot team at EMEX, stand E16

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