A report of the company Danfoss, specializing in infrastructure, food, energy and climate, draws attention as excess heat from cooling processes using these establishments, can be recovered as energy for heating network in supermarkets and even facilitate storage obtained from renewable.
According Danfoss the potential to add the flexibility of supermarkets to the needs of the smart grid is equivalent to 17.5% of wind energy in Germany or up to 30% of wind power in the EU. In addition, he argues that the potential of adding compressor capacity not used today, may increase demand flexibility in case of excess wind power production. Ie “together with external thermal networks such as district heating, supermarkets opportunity could serve as storage for renewable energy sources like wind,” he said in a statement.
The cooling process supermarkets traditionally generates heat that is wasted and ends up in the atmosphere and can be recovered as heat energy for trade itself or as a source of heat for district heating network.
“This combined cooling and heating process is being installed increasingly in supermarkets as an attractive business opportunity. It contributes to the objectives of reducing the energy consumption of local utilities and reduce CO2 emissions, plus provide a new source of income for the owner of the trade, “he says.
Virtual power plants and integration of renewable
As Danfoss explains, supermarkets are designed for products that require a high cooling can cope with high temperatures and high humidity in the summer so that under normal circumstances the compressors operating at only 30% of its maximum capacity. Danfoss insists the opportunity of connecting the supermarket to a district energy network to increase network capacity.
It also explains that local district energy networks are very effective to balance the fluctuating supply from renewable energies such as wind and solar, and claims that can work perfectly as storage facilities.
Environmental and economic benefits
According to the report Danfoss benefits would be manifold. On one hand, the amount of heat released to the environment is greatly reduced (40%). Furthermore, the process becomes a source of income for the supermarket, “even with a conservative estimate of heat (25 € per MWh) the amortization period of the investment is only 1 year and a half,” he says.
The statement explains how Danish supermarkets twenty sent their excess heat to local district heating networks and as in the case of a local supermarket close to the headquarters of Danfoss savings exceeded 27,000 euros per year in gas. In addition, CO2 emissions were reduced by 34% by utilizing the excess heat from the cooling system of hot water for households, among other things.