Siphonic drainage system is a gravity drainage system with fully filled pipe flow, which uses small diameter pipes to generate siphonage. This system is considered as a completion and expansion of the conventional drainage system, because it achieves strong conveyance performance without having to provide piping slopes. The purpose of this study is to establish the design methods for designing a siphonic drainage system for waste water. In our previous paper, we organized the flow characteristics and basic structures of the siphonic drainage system. In this paper, which is a continuation of the previous paper, we derive the theoretical calculation formulas and indicate their effectiveness with regard to the siphonage in this system. In addition, we discuss the effects of installing or not installing air admittance valve and trap through the drainage experiments.

Since geothermal heat is not affected by the outside air condition, and the temperature change is small throughout the year, it is gaining attention as renewable energy that can be used stably. Therefore, in this research, we analyze the relation between the primary energy consumption units of each of the two categories and the heat demand required for the heat source system. In addition, energy saving effect of the groundwater heat source system at the research facility was investigated. As a result, it was confirmed that during actual operation the heat source system using groundwater is an effective system for reducing the primary energy consumption. In addition to the past survey, we examined the optimum operation method of the entire heat source system in the target building.

An adsorption refrigerator with a zeolite adsorbent can be regenerated using water at a low temperature of 45 to 60 ℃. In this refrigerator, the cold water outlet temperature fluctuates, and with increase in the cycle time, the fluctuation range becomes larger. Therefore, it may be difficult to use this in air conditioning applications or applications requiring accurate water supply temperature. In a previous study, the amount of cooling water supplied to a heat exchanger (HEX) coated with an adsorbent was varied to maintain a constant cold-water temperature at the outlet. However, it was found that the cooling capacity reduces after the subsequent cycle. In the previous system, when the amount of cooling water supplied to the HEX decreases, the amount of cooling water supplied to the condenser also decreases, because the HEX and condenser are connected in series through a cooling pipe. In this study, we installed a bypass route from the inlet side of the HEX to the condenser in order to maintain the amount of cooling water supplied to the condenser in a stable manner. Then, we measured the temperature change of the cold water and the cooling capacity. We confirmed that the mean deviation of the cold-water outlet temperature could be improved to within ±0.2℃ by reducing the output to 80-90% of the steady-state cooling capacity.