An improved air circulation system was designed and proposed to help providing a dynamic and uniform boundary layer which could help preventing tip burn occurrences in lettuce production.
The results can be a good reference for the design of steam circulation system in SCWR design.
The concept of functional failure, i.e., the possibility that the load will exceed the capacity in a reliability physics framework, in terms of performance parameter is introduced here for the reliability evaluation of a natural circulation passive system, designed for decay heat removal of innovative light water reactors.
Transient simulating and scaling analyses are carried out to reproduce the transient operating behaviors of the prototypical big-scale open natural circulation system, which is designed for the Passive Containment Cooling System (PCCS).
Simulating investigations are carried out to study the resistance characteristics and flow instability during the start-up of the open natural circulation system, which is designed for the passive containment cooling system.
Simulating investigations are carried out to study the steady-state performances, the pressure resistance distributions and the scaling methods of the single-phase and flashing-induced two-phase flow in the open natural circulation system, which is designed for the passive containment cooling system.
To overcome the airflow resistance, Fan Filter Units (FFUs) used in the traditional wall-returned re-circulation system are designed to operate with high external pressures, which also induce high negative pressures in supply air plenums (SAP).
A carefully designed water circulation system was established in the laboratory to evaluate the accuracy and precision of flow velocity measured by heat-pulse flowmeter in various conditions.
Heat transfer tests for the upward straight tube bundle in the emergency cooldown tank were performed to find the characteristics of the passive system design under natural circulation conditions.
The results indicated that the case with two perforated air tubes was able to provide an average air velocity of 0.42 m s−1 with a coefficient of variation of 44%, which was recommended as the optimal design of air circulation system among four cases in this study.
