As the front of the lot faces west, the building must maintain a suitable presence from the street while maximizing the southern orientation for solar heat gain in the winter. (treehugger.com)
You've mentioned solar screens and these appear to do the job, claiming to reduce solar heat gain substantially with their 80 % closed screen material. (energyvanguard.com)
But about 15 years ago, a Swiss architect developed and patented a wall system that provides passive solar heat gain for new homes and buildings. (realtormag.realtor.org)