[1
]Institute of Energy and Sustainable Development, De Montfort University, The Gateway,
Leicester LE1 9BH, UK,
[2
]Heschong Mahone Group, Inc., 11626 Fair Oaks Blvd, 302, Fair Oaks, CA, 95628, USA
[3
]Building Technologies Program, Environmental Energy Technologies Division, Lawrence
Berkeley National Laboratory, Mailstop 90-3111, 1 Cyclotron Road, Berkeley, CA 94720,
USA