Abstract
The number of domestic apartment houses in South Korea that use district heating is steadily increasing. In addition, most Korean residential buildings use radiant floor heating systems. For such systems, the heating water temperature supplied by a heat exchanger in a mechanical room serves as one of the critical control parameters for providing heat to individual residential apartments. Fixed temperature (FT) and outdoor temperature reset control (OTR) have conventionally been used to adjust the heating supply water temperature. However, both control methods have a major technical weakness; they do not reflect changes in residents’ heating use. To overcome this issue, this study proposes a new method for controlling the heating supply water temperature, called Residential Energy Demand (RED). To verify the proposed method, researchers conducted both simulation- and experiment-based tests. The RED control method achieved about 4% reduction in heating energy consumption compared to the conventional OTR control process. In addition, the RED control method increased the average indoor temperature by 0.17 °C during the heating period. Therefore, this study demonstrates that the proposed control method is capable of achieving energy savings and a warmer thermal indoor environment.
Highlights
High-rise apartment buildings comprise one of the primary residential housing types in South Korea, and their number is increasing (i.e., 13.8% in 2007, 15.9% in 2010, 16.7% in 2013, and 19.0% in 2016) [1]
Based on the above literature review, it was identified that many studies proposed new control methods for a radiant floor heating system to reduce heating energy consumptions and to meet required heating loads
In South Korea, the heating water temperature as provided by a heat exchanger located in the mechanical room is conventionally controlled by one of two methods: fixed temperature (FT) or outdoor temperature reset (OTR)
Summary
High-rise apartment buildings comprise one of the primary residential housing types in South Korea, and their number is increasing (i.e., 13.8% in 2007, 15.9% in 2010, 16.7% in 2013, and 19.0% in 2016) [1]. Based on the above literature review, it was identified that many studies proposed new control methods for a radiant floor heating system to reduce heating energy consumptions and to meet required heating loads. In South Korea, the heating water temperature as provided by a heat exchanger located in the mechanical room (i.e., supply side) is conventionally controlled by one of two methods: fixed temperature (FT) or outdoor temperature reset (OTR) Both share a major technical limitation; they do not reflect changes in residents’ heating use when setting the heating supply water temperature. The third step was to analyze the study results, including the heating supply water temperatures, amounts of energy consumption, respective energy savings, and resultant indoor temperatures Based on this analysis, the proposed control method compared favorably to the conventional (i.e., OTR) control process
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