Heat transfer coefficients in a full scale room with and without furniture

The convective heat transfer coefficient at an outer ambient wall with a window exposed to natural climate was measured in a room with and without furniture. The method used was to estimate the heat flow from measured temperatures and solar radiation. The convective heat transfer was calculated as the difference between the heat flow through the building element and the calculated longwave radiation. The accuracy was at best ±15% for the window and ± 20% for the wall. Even so the effect of different heating and ventilation strategies on the inside could clearly be detected. Local coefficients may be more than  10  times  he  expected,  due  to  ventilation  or position of the radiator.