Original scientific paper https://doi.org/10.2298/TSCI150601165S The highest heat losses are found for wind direction α is 60° with respect to receiver stand and lowest heat losses are found for wind direction α is 0° (side-on wind). The heat losses obtained for wind direction, α, is 30° condition are higher than the heat losses obtained for wind direction α is 0° (side-on wind) condition, while the heat losses obtained by wind direction α is 90° (head-on wind) condition are less than the heat losses obtained for wind direction, α, is 60° condition.