| 요약2 |
The dominant heating system used in Korean residential apartment buildings is a hydronic radiant floor heating system, known as the Ondol system. The most widely used control strategy applied to this traditional hydronic radiant system is a simple on-off control that intermittently supplies ‘hot water of a fixed temperature’ at ‘constant flow rate’ to each room. But, the current problems with the aforementioned control are as follows: (1) since the control is based on one point measured temperature (usually a signal from a thermostat installed in a living room) in each dwelling unit, significant difference in temperatures between spaces(master bedroom, living room, bedroom1, bedroom2) can occur. (2) the most widely used residential water splitter has static valves, thus is not able to change the flow rate to each room depending on heating load of spaces. In other words, the ratio of flow rates to rooms is fixed after once constructed. (3) Due the aforementioned reasons, over- or under-heating can happen, leading to improper use of energy. Thus, the paper aims to investigate the difference in the system’s performance between four control strategies. |