2014

Lokalförvaltningen – projects in sustainable housing

 

We build only low-energy when we build new buildings

A new building in Lokalförvaltningen auspices should only use a maximum of 45 kWh / year of energy for heating, hot water and building operations. This is about 60% lower than required in the national building regulations and is in line with passive house standard. In addition, we make very high demands on the energy performance of the components that affect the company’s energy consumption, such as energy saving light with smart control, energy-efficient appliances.

We put very high standards on materials use

We assume that children are more sensitive to exposure to hazardous materials. Therefore, we avoid such endocrine disruptors. Duurability over time is a key word. Several projects have green roofs, known as sedum roofs to increase biodiversity, add more green in the urban environment, reduce stormwater flows, creating better microclimate and promote noise reduction.

Göteborg Energi AB – investments in district heating

Celsius – district heating for boats

In Celsius, the city has a “lead” position and Göteborg Energi AB project manages the various European cities participating in the project. Purpose is to show how the district heating and cooling can be used in particular to utilize waste heat in a city and maximize energy efficiency. EU demands this kind of solutions to achieve the 20 percent energy efficiency  by 2020.

A measure implemented by Celsius project is to heat a large ferry with district heating when it is docked. Göteborg Energi’s district heating system supplies the Stena Danica with hot water by a new heat exchanger. Gothenburg and Stena Line are the first in the world with this. Since earlier the ferry is also connected to the land electricity network. This saves emissions of 500 tons of carbon dioxide per year.

Celsius – district heating for domestic appliances

Instead of heating water in a washing machine or air in a dryer with electricity, a use can be made of district heating. Using district heating, it is possible to replace up to 80% of electricity demand and reduce the power requirement of electricity by up to 90%. With disting heating, the heat comes from the heat exchanger to the machines, instead from of electricity.

 

Gryaab – Denitrification

In order to fulfill Sweden’s commitments under the Baltic Sea Action Plan and to meet future population growths, Gryaab estimates that it is necessary to increase nitrogen retention further. Gryaab has decided to invest SEK 360 million on an expansion of existing denitrification facilities. The new plant if expected to be taken into use in 2016. The nutrient nitrogen is of great importance for the eutrophication of the North Sea.

Gryaab nitrogen removal is done in two steps. In the first step transforms bacteria ammonium into nitrate and in the other nitrate to nitrogen gas. The nitrogen then end up in the air rather than to fatten the sea. The new extension will increase capacity in the first stage.

A reactor with so-called mobile carriers will be built. The carriers are plastic pieces which bacteria adhere and grow into. The use of mobile carriers is an effective way to purify water in a small space. Prior to the decision, consultations with Gryaab seven owner municipalities were conducted. All municipalities were in favor of the investment.