The “Green Warriors” is a student group consisting of seven students from Norwegian University of Science and Technology (NTNU), Shanghai Jiao Tong University (SJTU), Tsinghua University (THU), and School of Planning and Architecture Delhi (SPA). Among four other groups, they participated at the 2018 International Summer School on Sustainable Energy, which was held in Trondheim in August this year. This two-week summer school aims at developing energy strategies that would enable the Sluppen area in Trondheim to be energy-positive.
According to the municipal plan, Energy and Climate 2017–2030 (Kommunedelplan: energi og klima 2017–2030), the Trondheim Municipality is aiming for a per capita 20% decrease in stationary energy consumption by 2030 based on a 2013 baseline in the city and achieving zero emission in the whole municipality. This is a very bold vision, but the “Green Warriors” have shown that this could be done by a carefully designed renewable energy system. Here are some selected suggestions and comments from the group.
Heat from waste and biomass as well as heat pumps
Norway has a long and cold winter, which creates a huge demand for heating. Due to the simplicity and low cost, many resistance heaters, which convert electricity to heat, have been installed in the past. However, the efficiency of the resistance heaters are generally low compared to other alternatives. One way is to use heat pumps, which can be at least twice efficient than the resistance heaters. Applications of heat pump systems can be found from the Industrial Process Technology Group at Department of Energy and Process Engineering (EPT), NTNU. Another method is to utilize waste to energy or biomass to energy plants, where solid fuels such as wood briquettes and municipal solid waste (MSW) are combusted to produce heat.
Since the biomass and the biogenic portion of the MSW (typically 50% of the total energy content) are considered as renewable energy, the produced heat is also mostly renewable. In addition, the volume of the MSW can be reduced significantly (over 90%) in the modern incinerators. The residue ash can be also recycled and used as raw materials for other applications, such road construction. More examples regarding to utilization of biomass and waste can be found from the ComKin Group at EPT, NTNU.
Electricity from the hybrid solar and wind energy system
Today, nearly all the electricity demand in Norway is met by the hydropower based generation. However, there is also a big potential for the solar photovoltaic (PV) and wind power generation. Solar and wind energy have the characteristic of strong seasonal variations. The generation potential for the wind energy is usually bigger in the winter months than in the summer months. On the contrary, the solar PV panel produces much more electricity in the summer months, which have long daylight hours, than in the relative dark winter months. This makes two energy systems complement each other very well. An example of a modern wind turbine can be found in the field station Frøya.
Team members of the “Green Warriors” are Lisane Carre, Manasa Garikaparthi, Christian Baloloy, Shuting Zhuang, Hongli Sun, Jiajie Peng, and Shaowei Chai. The “Green Warriors” has been supervised by Tian Li and Trygve Eikevik from EPT, NTNU and Yong Li from SJTU.
The 2018 International Summer School on Sustainable Energy was supported by the SiNoPSE Sino-Norwegian Partnership on Sustainable Energy project and SSCRI – Smart Sustainable City Regions in India project.
Facts on the SiNoPSE project
- Full name: Sino-Norwegian Partnership on Sustainable Energy
- Funding agency: Research Council of Norway
- Project type: International Partnerships for Excellent Education, Research and Innovation (INTPART) project
- Duration: 3 years (finishes December 2018)
- Participating institutions: NTNU, SJTU (China), TSU (China)