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경제성 확보를 위한 빗물이용시설의 규모 산정 및 민감도 분석
문정수,김하나,박종빈,이정훈,김이호,Mun, Jung-Soo,Kim, Ha-Na,Park, Jong-Bin,Lee, Jung-Hun,Kim, Ree-Ho 대한상하수도학회 2012 상하수도학회지 Vol.26 No.2
Rainwater harvesting systems (RWHS), one of measures for on site rainwater management, have been promoted by laws, regulations and guidelines and have been increased. However, more evaluation of economic feasibility on RWHS is still needed due to seasonal imbalance of rainfall and little experiences and analysis on design and operation of RWHS. In this study, we investigated tank capacity of RWHS to secure economic validity considering catchment area and water demand, which is affected by building scale. Moreover, sensitivity analysis was performed to examine the effect of design factors, cost items and increase rate of water service charge on economic feasibility. The BCR (benefit cost ratio) is proportional to the increase in tank capacity. It is increased steeply in small tank capacity due to the effect of cost and, since then, gently in middle and large tank capacity. In case of 0.05 in the rate of tank volume to catchment area and 0.005 in water demand to catchment area, BCR was over one from the tank capacity of 160 $m^{3}$ taking into account of private benefits and from the tank capacity of 100 $m^{3}$ taking into account of private and public benefits. Sensitivity analysis shows that increase of water demand can improve BCR values with little cost so that it is needed to extend application of rainwater use and select a proper range of design factor. Decrease of construction and maintenance cost reduced the tank volume to secure economic validity. Finally, increase rate of water service charge had considerable impact on economic feasibility.
문정수 ( Jung Soo Mun ),이지훈 ( Ji Hoon Yi ),독고석 ( Ko Seok Dock ) 빗물학회 2007 빗물 Vol.1 No.1
Since the temperature during summer is higher than the temperature which is suitable for milking cows, high temperature stress have severely affected dairy farmers due to decreased pregnancy rate of cows and milk production. In this study, the existed rainwater utilization facility equipped in the cattle shed was used as Rainwater Cooling System (RCS). Temperature in the cattle shed before and after installation of RCS was measured and effects of heat transfer in the rainwater tank located underground were also investigated. When the RCS was installed, as though outside temperature of cattle shed increased, the inside temperature of cattle shed was lower than that of the outside. During the hottest hour (13:00~14:00) of a day, the inside temperature of cattle shed was less by 2.2℃ after installing RCS. Consequently, it was found that the heat stresses for milking cow decreased. Finally, during installation of RCS, it was observed that the temperature of rainwater in the rainwater tank remained constant. So it seemed that sufficient heat transfer occurred from rainwater tank to underground.