TopGas® 2017 by Hoval USA

More catalogs by Hoval USA | TopGas® 2017 | 12 pages | 2017-03-16


Page 6 of TopGas® 2017

topgas ® the advantages in detail the condensing action the hot flue gases are cooled to below 57°c in the heat exchanger this causes steam contained in the flue gases to condense ­transferring additional heat energy to the heating water hot combustion gases approx 1000°c 57°c approx 85 heat ­t ransmission to the heating water owing to cooling of the ­combustion gases condensing action approx 15 additional energy recovery from condensation cooled flue gases approx 40°c flat flame pattern with optimum combustion ­temperature for ultra-low emissions condensing boiler technology for maximum efficiency durable heat exchanger with excellent energy yield modulating premix burner with ultra-low emissions as a general rule the more heat energy is transferred from the combustion gases to the heating water the more efficiently a boiler works it is crucial for condensation that the hot combustion gases transfer their heat energy as quickly as possible cooling as they do so using condensing boiler technology the gas is cooled from 1000°c down to 40°c and transfers all of its directly usable heat energy to the heating water in contrast low-temperature boilers have considerably higher flue gas temperatures of around 200°c this means that a lot of the heat energy escapes unused via the chimney the heat exchangers in the topgas® classic combi and comfort are made from a high quality aluminium-silicon alloy on the flue-gas side and copper on the water side the thermal conductivity of aluminium is ten times that of stainless steel together with the special surface structure this optimises heat transmission resulting in maximum energy efficiency at the same time these materials provide reliable protection against corrosion another factor contributing to the high efficiency of the topgas® range is the combustion system this comprises a fan-premix unit which also controls the output and the grid burner condensing boiler technology also makes use of a second crucial element condensation the combustion gases contain steam which stores large quantities of “latent” energy when the steam cools to below 57 degrees it becomes liquid condenses in the process this “latent” energy is released and transferred to the heating water in this way topgas® condensing boilers recover around a further 15 of the energy with efficiency rising to over 107 6 the use of a design with a forced-flow copper meander prevents deposits and blockages in the heat exchanger so ensuring a long service life in the fan-premix unit a finely-tuned homogeneous gas/air mixture is produced which is optimised for the subsequent combustion the output is matched modulated to the heat demand using the rotational speed of the fan this means the burner can run continually in partial load operation and avoid energy-intensive start-stop operation and the associated increase in emissions moreover reducing the speed of the fan reduces energy consumption in the grid burner the gas/air mixture is ignited on the surface of a metal fabric and burns gently virtually without flame the majority of the heat is given off as infrared radiation here the combustion temperature is consistent and lies within an optimum range resulting in ultra-low pollutant emissions.