Critical Analysis of Thermal Energy Losses in Boiler-burner Systems and Relative Technical Standardization Developments in Domestic Space Heating.

Several proposed test procedures for the measurement of partial load efficiency of boilers are examined. The most interesting standardization proposals have been selected for a comparative examination. A real interest for the measurement of the efficiency of boilers at reduced loading appears from this investigation. A draft standard is proposed for a method of evaluation of partial load efficiency for burner-boilers systems in Italy: for the present, a simple method in which only stack losses (constant percentage) and wall losses (constant power) are accounted for; for the future, a direct measurement method carried on with experimental plant equipped with a thermal capacity and with two different hydraulic loops: a three-way valve loop for testing boilers to be used out of heated rooms; a loop without a three-way valve for testing boilers to be used in heated rooms.