Base for appropriate boiler selection is a thermal balance of the heated area created according to thermal standards for buildings. The nominal thermal efficiency should equal or be little higher (about 10%) than calculated heat requirement of the heated area. In chart below we put approximate data for UKS boilers size and area that can be heated by those boilers – in chart nr 3 for areas of 35-280m2 and in chart nr 4 for areas of 430-3220m2. The data is approximate and has been calculated for rooms up to 3m height and heat loss rate of 46.5 W/m2(40 Kcal/m3h).
Type of fuel recommended for UKS heating boilers was given in the chart, No. 8 and 9. Use of lower quality fuel than recommended will result in thermal efficiency drop. Fine coal should be wet before use.
