Condensing boilers and variable speed pumps as a refurbishment option for heating systems in residential buildings - Energy and economic evaluation

8th International Conference on Advanced Concepts in Mechanical Engineering

Papakostas, K.T.^1 ; Pitsavou, F.^1

Mechanical Engineering Department, School of Engineering, Aristotle University of Thessaloniki, Thessaloniki

EL 54124, Greece^1

关键词: Central heating system;    Controlled variables;    Economic evaluations;    Electrical energy consumption;    Electrical energy savings;    Residential building;    Thermal energy requirement;    Variable-speed pumps;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/444/8/082001/pdf
DOI  :  10.1088/1757-899X/444/8/082001

来源: IOP

【 摘 要 】

This paper studies the energy and economic impacts from the replacement of a high-temperature hydronic heating system, consisting of an oil-fired conventional boiler and constant-speed circulator, by a low-temperature system with gas-fired condensing boiler and electronically controlled variable speed pump, in a residential building. Five case studies, which are categorized by the overall thermal insulation of the building and by the installed heating system, are examined in each of the two largest towns in Greece, namely Athens and Thessaloniki. In each study, the central heating system is designed and the thermal and electrical energy consumption is estimated by simulating the system according to the Bin method. Additionally, the operating cost, the cost of replacing the heating system, and the payback period of the investment are calculated. In the cases analysed, without any thermal insulation upgrade, the annual reduction of the thermal energy requirements varies from 26 to 29%. By upgrading the thermal insulation, thermal energy savings vary from 40 to 84%, depending on the previous insulation level of the building. With the use of variable speed circulators, electrical energy savings exceed 87% in all case studies. The fuel and electricity cost savings (prices of 2016) vary from 37 to 51%.