En kostnadsanalys för sjötransport av industriell restvärme

Sammanfattning: The storage and transport of heat is today a concept that is under constant development and has opened possibilities for new applications of utilising industrial excess heat. A number of studies have been done on the subject which have demonstrated the applicability in practice. The technique is based on heat storage in phase change materials (PCM) in an insulated container by indirect or direct heat transfer. Previous studies have shown that profitability is possible for road-based transport when distances and costs for excess heat is less than 40 km single route and 150 SEK/ MWh. Therefore, to investigate the potential of using transportation methods suitable for longer distances can highlight possibilities to enter new markets and to demonstrate potential investment opportunities. This study aims to explore the feasibility of transporting industrial waste heat with sea freight methods using existing storage techniques with phase change materials to district heating systems. The application of the concept in the study is based on a case where SSAB Oxelösund is the supplier of industrial excess heat and the district heating network in the Stockholm region is regarded as the consumer market. The theoretical application of the concept of maritime transport of industrial waste heat from Oxelösund to a district heating system in Stockholm gave negative results regarding the investment decision. The outcome of the study gave negative profitability parameters and showed that the transport costs are the most crucial for the feasibility of the concept. The study yielded results showing that the concepts cost elements require an initial investment of 1.3 MSEK and a variable transportation cost equivalent to 3 500 SEK per cycle. Given todays district heating prices and the value of stored heat per container, the possible sales price of each delivery amounts to 2 120 SEK which fall far below the transportation costs. From this study we can therefore establish that if industrial waste heat are to be sold to district heating markets using MTES, the profitability of the concept is dependent of cheaper transportation methods and shorter distances.