Passive Solar Performance of Tech House V

The performance of a passive solar modular house located in Knoxville, Tennessee (TECH House V) was determined for the 1981–1982 heating season. The 111 m² (1200 ft²) house has 13.7 m² (144 ft²) of south facing glass and 20 vertical water tubes. The auxiliary heat was measured directly while the net solar gain was calculated using hourly measured vertical insolation, weather, and inside-space temperature data. The solar collection efficiency was 64 percent and the solar fraction was 0.40.