CASE STUDY D enmark has a target to reduce greenhouse gas emissions by 70% by 2030 and a goal of climate neutrality by 2050. Fundamental to achieving this is the transition of the Danish heating sector to near-zero CO2 emissions by 2030. To assess how the heat sector can transform in a technically, economically and environmentally appropriate way in such a short period of time, researchers at the University of Aalborg (AAU) developed the Heat Plan Denmark 2021. This document sets out how the heating sector can transform relatively quickly using technologies that are already available. See panel, Heat Plan Denmark: key messages. The Hornsyld Project is a good example of how Hornsyld-Brskov local council is planning to apply the Heat Plan Denmark 2021 by using heat from industrial processes specifically from drying beans used for animal feeds to transform the heat supply for Hornsylds 1,600 inhabitants, as well as schools, sports facilities and businesses. Hornsyld is a compact town with a relatively high density of heat-consuming buildings, with a peak heat load of 5.3MW. Currently, the majority of its dwellings and businesses are heated by individual natural gas boilers. The local council is proposing to install a new district heating system to use the large amount of heat being lost to the atmosphere by Hornsylds industries. The two main industries in the town are Triple A, an animal feed producer, and Hornsyld Kbmandsgrd, a grocer and | HORNSYLD HEAT NETWORK KEEN BEANS To meet the countrys climate change targets, Danish towns are set to use industrial heat waste to power networks and deliver heat to residents and businesses. Andy Pearson describes one such project in Hornsyld agro-business that grows horse beans (a member of the broad bean family) for use in animal feed. The waste heat for the scheme will come from a feed dryer at Triple A. The drying process uses air heated directly by the combustion of natural gas. This air is drawn through the feed, which evaporates approximately 6,000 litres of water an hour. Currently, the hot and humid exhaust air is discharged to the atmosphere at a temperature of approximately 60C. Under the councils proposal, a scrubber will be used to wash the exhaust air with cold water to condense the vapour from the air stream. A heat pump will extract heat from the warmed condensate and then raise its temperature to the outlet temperature for the district heating supply. The process is expected to produce between 4MW and 5MW of heat. However, only 3MW will be used for this project, consisting of 2MW supplied by the heat pump and an additional 1MW from direct exchange. The feed dryer is expected to run for a minimum of 7,500 Brskovgrd Boarding School (1200 MWh/year) www.cibsejournal.com August 2022 35