Downscale Application of Boiler Thermal Calculation Approach The Holistic Approach to Environment

Zbyněk Zelený, Jan Hrdlička
2016 unpublished
Commonly used thermal calculation methods are intended primarily for large scale boilers. Hot water small scale boilers, which are commonly used for home heating have many specifics, that distinguish them from large scale boilers especially steam boilers. This paper is focused on application of thermal calculation procedure that is designed for large scale boilers, on a small scale boiler for biomass combustion of load capacity 25 kW. Special issue solved here is influence of formation of
more » ... formation of deposits on heat exchanging surfaces on efficiency of heat transfer and on overall boiler efficiency. In the paper are presented results of mathematical model created for this purpose and its verification by experimental measurement in this specific boiler. Key words: small scale biomass boiler, thermal calculation methods, heat transfer,heat transfer surface deposits. Toplinski proračun za toplovodni kotao u kućnoj uporabi. Najčešće korištene metode toplinskog proračuna namijenjene su prvenstveno velikim kotlovima. Toplovodni manji kotlovi, koji se obično koriste za zagrijavanje kuća imaju puno specifičnosti koje ih razlikuju od velikih kotlova, posebno parnih kotlova. Ovaj rad je usmjeren na primjenu toplinskog proračuna, koji je prvotno namijenjen za velike kotlove, na manji kotao za spaljivanje biomase kapaciteta 25 kW. Posebna tema razmatrana u ovom radu je utjecaj formiranja naslaga na površinama na kojima se izmjenjuje toplina na učinkovitost prijenosa topline i na ukupnu učinkovitost kotla. U radu su prikazani rezultati matematičkog modela stvorenog za tu svrhu i njihova verifikacija s eksperimentalnim mjerenjima provedenim na tom konkretnom kotlu. Ključne riječi: manji kotlovi na biomasu, metode toplinskog proračuna, prijenos topline, prijenos topline uz površinske naslage.
fatcat:dwkrloo5pzatziackxb3a7jmwy