1. Environmental Engineering, University of Wollongong, Wollongong NSW 2522, Australia, School of Engineering and Electronics, The University of Edinburgh, Edinburgh, EH9 3JL, United Kingdom, Centre for Sustainable Energy Systems, Australian National University, Canberra, ACT 0200, Australia, and School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, United Kingdom