GREEN PUBLIC HEAT

IN “GREEN DISTRICT HEAT” WE DEVELOP A TOOL FOR ESTABLISHING ENERGY SYMBIOSES

In the Green Public Heat project we are working on developing a generic model for the utilization of waste heat from industry as district heat at nearby oil villages. The model is to be used as a tool to test different scenarios and provide indications on what could generate a positive business case.

In partnership with the Symbiosis Center Denmark and Roskilde University Center (RUC), Gate21 is leading the regional district heating project Green Collective Heating (GKV). Utilities from six municipalities have identified possible cases that in various ways could contribute to displacing the use of fossil fuels in the Region of Zealand. Four of these municipalities deal with industrial symbiosis, which investigate whether surplus heat from their case companies can be delivered to the district heating network in a socio-economically and environmentally sustainable manner.

A feasibility study will be carried out to form a solid basis for decision making. This includes a clarification of whether for instance a 33% surplus heat could pose a significant barrier to the establishment of industrial symbiosis.

Symbiosis Center Denmark is mainly in charge of the Kalundborg case. The Statoil refinery is one of the partners in the Kalundborg Symbiosis, producing surplus heat from process enough to cover the equivalence of 80% of Kalundborg’s heat demand. Therefore, we seek a business model for whether surrounding fossil-fueled villages, such as Rørby and Ubby and other residential areas, can receive green heat. As a means a model is developed, in which different assumptions are tested based on end users’ heat demand. These reflect in the price of e.g. insulated and non-insulated pipes, whose low temperature is boosted by heat pumps – all of that compared to the cheapest option, such as biomass firing. The model will be based on a mapping of potential suppliers of surplus heat, and serve as a tool for analyzing the application of surplus heat in a district heating system, and finally developing a business concept for the cooperation between the utilities and the surplus supplier.