Modeling operation mode of pellet boilers for residential heating

32nd UIT (Italian Union of Thermo–fluid-dynamics) Heat Transfer Conference

物理学;力学

Petrocelli, D.^1 ; Lezzi, A.M.^1

Dipartimento di Ingegneria Meccanica Ed Industriale, Università Degli Studi di Brescia, via Branze 38, Brescia

25123, Italy^1

关键词: Control strategies;    Domestic hot water;    Dynamic behaviors;    Modeling operation;    Operating condition;    Pollutant emission;    Residential heating;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/547/1/012017/pdf
DOI  :  10.1088/1742-6596/547/1/012017

学科分类：力学，机械学

来源: IOP

【 摘 要 】

In recent years the consumption of wood pellets as energy source for residential heating lias increased, not only as fuel for stoves, but also for small-scale residential boilers that, produce hot water used for both space heating and domestic hot water. Reduction of fuel consumption and pollutant emissions (CO, dust., HC) is an obvious target of wood pellet boiler manufacturers, however they are also quite interested in producing low- maintenance appliances. The need of frequent maintenance turns in higher operating costs and inconvenience for the user, and in lower boiler efficiency and higher emissions also. The aim of this paper is to present a theoretical model able to simulate the dynamic behavior of a pellet boiler. The model takes into account many features of real pellet boilers. Furthermore, with this model, it is possible to pay more attention to the influence of the boiler control strategy. Control strategy evaluation is based not only on pellet consumption and on total emissions, but also on critical operating conditions such as start-up and stop or prolonged operation at substantially reduced power level. Results are obtained for a residential heating system based on a wood pellet boiler coupled with a thermal energy storage. Results obtained so far show a weak dependence of performance in terms of fuel consumption and total emissions on control strategy, however some control strategies present some critical issues regarding maintenance frequency.