Benchmarking of space heating demand for a sample of foundries in Nordic climate

Panel: 3. Energy management: The nuts and bolts

This is a peer-reviewed paper.

Authors:
Emil Nilsson, Linköping University, Sweden
Elias Andersson, Linköping University, Sweden
Patrik Rohdin, Linköping University, Sweden
Patrik Thollander, Linköping University, Sweden

Abstract

Improved energy efficiency is a cornerstone in climate change mitigation and for individual companies to reduce energy costs and remain competitive. Research over the years has had a strong focus on individual energy efficiency measures as well as processes, e.g. process integration, as well as various barriers to energy efficiency that inhibits the potential measures and process improvements to be implemented. Due to the inhomogeneity of the industrial sector, it remains a challenge to state general key performance indicators (KPIs) from a bottom-up level. This challenge is further complicated by industrial companies’ unwillingness to share data regarding, for example, energy end-use. This makes publications where energy-KPIs are reported important.

In this study, purchased energy for space heating and actions undertaken to decrease purchased energy for space heating was compared for a sample of ten Swedish foundries. As hourly heating degree data between company locations differs at most by 7% for a balance temperature of 20 °C, no adjustments were made to compensate for this difference. The sample spread in terms of energy performance for space heating was noted to be large. The five best performing companies showed values below 100 kWh/(m2,year), and the two worst-performing companies showed values above 300 kWh/(m2,year). The companies with less than 100 kWh/(m2,year) have all worked with process integration and have a high degree of heat recovery, using their excess heat from production efficiently. However, it is important to note that these companies do not necessarily have a more efficient building envelope (Utot). The high energy end-use for companies in this sector makes process integration and heat recovery from processes important. This, among other reasons, as heat removal is needed in order to avoid too high indoor temperatures. If this excess heat is used efficiently, a space heating demand well below 100 kWh/(m2,year) is possible. In practice, however, there may be technical and economic factors hindering heat recovery from being implemented to this extent.

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