Heat, smoke and fuel consumption in a high mountain stállo-hut, northern Sweden – Experimental burning of fresh birch wood during winter

Abstract

The overall aim of this study was to investigate in situ, the use of an open fire for heating a traditional mountain Sami stállo-hut during winter using fresh mountain birch as fuel. The study took the form of repeated actualistic experimentation and the following parameters were recorded: fuel consumption and logistics, indoor temperature, CO-levels inside the hut and temperature in both the hut and the traditional Sami stone-lined hearth with a stone filling of flat stones. Our results show that fresh birch is an effective fuel and that about 3.6 kg (dry weight) of wood was used per hour; it took a few hours of work per day to obtain the firewood required. The highest temperature recorded beneath the stone filling in the hearth was 437.7 °C. The hearth stored a lot of heat but this did not affect the indoor temperature during the night. The highest indoor temperature indoor was +26.9 °C, but it was generally much lower and varied considerably during the day and in relation to the outdoor temperature. The CO-levels reached 112 ppm at floor level and co-varied with the smokiness experienced inside the hut.