| 요약2 |
The Radiant Floor Heating System generally applied in apartment house these days needs to supply adequate heat capacity to maintain the set indoor temperature for each room by providing the adequate flow rate of hot water via heating panels. However, due to more diversified house plans, and enlargement of the areas of each house and room, the heating panel for each room tends to have a clear difference in lengths. As such, the flow rate for each room is not equivalent, resulting in disproportionate indoor temperatures for each of them. A solution to this has been proposed in which a valve is used to impose a certain amount of resistance to balance the flow rate. It is called the manual flow rate balancing. However, given the technical obstacles, it would also generate sizzling noises whose sound source is unclear. This is because the overcapacity of the boiler circulating pumps and resistance of certain valves increase in proportion, leading to a greater pressure drop. It would in turn end up in cavitation. In particular, in case heating is required for only a small number of rooms due to the tendency toward nuclear family, the flow rate is concentrated in the remaining limited number of valves. As such, a greater pressure drop would increase the possibility of noise generation. Therefore, this research aims to analyze the causes for noise generation resulting from cavitation, and propose complementary measures for the problem. Furthermore, comparative analyses were made based on the simulation and experiments utilizing the vibration outcomes for each frequency range in terms of cavitation prevention performance for the deduced means. |