Issue |
E3S Web of Conf.
Volume 396, 2023
The 11th International Conference on Indoor Air Quality, Ventilation & Energy Conservation in Buildings (IAQVEC2023)
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Article Number | 03017 | |
Number of page(s) | 5 | |
Section | Energy Efficient and Healthy HVAC systems | |
DOI | https://doi.org/10.1051/e3sconf/202339603017 | |
Published online | 16 June 2023 |
Experimental investigation on the thermal performance of a domestic gas boiler for space heating with different heating load ratio
1 Multidisciplinary Infra-technology Research Laboratory, Pukyong National University, Busan, Republic of Korea
2 Division of Architectural and Fire Protection Engineering, the Graduate School, Pukyong National University, Busan, Republic of Korea
3 Department of Architectural Engineering, Pukyong National University, Busan, Republic of Korea
This study explores the effects of heating demand and hot water temperature on energy efficiency in a domestic gas boiler (DGB). Mock-up experiments were conducted using two types of boilers with different capacities (i.e., 11.6 kW and 23.3 kW of non-condensing boilers, 16.3 kW of condensing boiler) for comparative analysis. As results, for space heating, the efficiencies of non-condensing boilers (i.e., 11.6 kW and 23.3 kW) and condensing boiler (i.e., 16.3 kW) decreased by 12-44%, 15-46%, and 2-22% respectively as the heating load ratios were changed from 100%-25%. When the supply hot water temperature settings decreased from 55℃ to 45℃, the efficiencies were reduced by 13.6% (11.6 kW) and 53.3% (23.3 kW). For the condensing boiler, an efficiency reduction rate was 16.7% as the hot water temperatures dropped from 45℃ to 35℃. Also, since the boiler capacity depends on domestic hot water (DHW) load, the daily heating demands of space heating and DHW load were analyzed. In the results, reducing the lower limit of heating output could be more effective in improving the boiler efficiency for space heating. To provide sufficient DHW demand, it is required to maintain the upper limit of the heating output.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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