Numerical assessment of a gas-fired condensing boiler model for residential buildings application

Abstract According to the official statistical reports, gas-fired boiler units still remain be one of main equipment types for meeting space heating and daily hot water demand residential dwellings across European Union. Due prevalence natural gas grid performance stability, boilers are considered as standard energy sources. On other hand, even though technology is a well-known concept, existing numerical models found in literature often case-specific with poor reusability mostly reflected fitted efficiencies. Algorithms behind these usually require input large amount hardly attainable design characteristics units. In this paper, modelling method acquiring condensing unit will shown. The model based on limited data available issued by relevant manufacturers. simulations programmed using programming language Modelica software tool Dymola. fixed intake which combusts into stable mixture combustion gases that further heat circulating water. During transfer process inside there possibility condensate formation out vapour increases efficiency unit. condensate, however, depending return temperature has lower than dew point gasses. goal research determine how accurate can indicators attained use together clearly defined assumptions follow methodology.