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JACA (Japan Air Cleaning Association)

The Abstracts of the paper carried by the Journal of JACA

vol.57-3(2019/9/30)

Swirling induction Type HVAC system

There is growing demand to reduce the costs of quality maintenance and production in production plants. Reducing the energy consumption within large-space cleanrooms presents a particularly significant challenge.
In this study, we applied a swirling-induction-type stratification air conditioning system (SWIT), which could efficiently cool and filter the air in a large-space cleanroom while preserving the manufacturing environment and conserving energy. This report provides a basic technical explanation of the use of TCR-SWIT systems in cleanrooms and presents a case study that was conducted to assess the impact of the introduction of a TCR-SWIT system to a manufacturing environment.
The energy-saving potential of SWIT systems is widely recognized, and they are currently used by many customers. In addition, the “SWIT System Energy Efficiency Renewal Project” won the 2012 Energy Efficiency Grand Prize (Product and Business Model Category).
TCR-SWIT systems have achieved record sales since 2006 and demonstrated extremely high energy-saving potential at low costs. Therefore, these systems are expected to achieve significant results in the field of cleanroom air conditioning and become the standard in the next generation of cleanroom air conditioning systems.

Air conditioning system of clean room by the combined of down-flow and up-flow

Energy saving is highly demanded for industrial clean rooms. In this report, the following features are considered in the clean room air conditioning system. 1) In the process area, installing Fan Filter Units (FFUs) centrally to form a down-flow. 2) In the maintenance area, instead of installing the system ceiling to form an up-flow. By adopting these airflow methods, the following three features can be obtained. 1) Energy saving for chiller. 2) Risk reducing for contamination. 3) Effective using for floor area. This report describes the air conditioning system of clean-room that have these three features.

Shaft-less jet flow ventilation system

Air circulation system using FFU (Fan Filter Unit) and DC (Dry Coil) is popular in case of non-unidirectional airflow clean room. Because DC are generally installed at return air shaft, the installation areas tends to be large. ”Shaft-less jet flow ventilation system” is a ventilation system using dry coil with fan (FDC) which are installed in clean room and blow air into ceiling directly. This system can reduce installation spaces of return air shafts and shorten construction period of clean room. As a result of evaluation using computer simulation, we have confirmed the efficiency of the system in case flow rate ratio of FFU and FDC is less than 80%.

The control of ambient air cleaning system utilizing several sensors

The fan filter unit (FFU) control system for clean rooms in which particle generation is mainly dependent on workers and their work, has been developed. The system utilizes particle sensors and motion sensors to control the FFU and adequately maintain air cleanliness within the clean room. In this paper, the system overview, the experiments to confirm the performance of the sensors are described. In addition, the effectiveness of the control system has been confirmed by the experiments which are conducted in a mockup clean room.

Virtual Duct Clean Room system (VD-CR)

A large clean room in a factory needs “stable cleanliness, temperature and humidity” and “factory layout flexibility”. And it must be realized at low cost. However, it is difficult to meet these requirements at the same time in a typical air conditioning system. Therefore,we have developed a new air conditioning system that can meet these requirements simultaneously. Encouraged by our good results of development, we are going to introduce our uniquely and typically designed air conditioning system which is named “Virtual Duct Clean Room system (VD-CR)”, and to explain its effectiveness and cost performances.

Variable cleanroom HVAC system (T-Flexible Cleanroom)

Due to the notable developments of the technologies in recent years the demand for the change in the production lines at manufacturing facilities is increasing, such as production items and manufacturing equipment. Therefore, we have developed the next-generation cleanroom at a low cost with high efficiency and high flexibility which enables quick and easy adjustment of production lines changes. This cleanroom has been designed to be used extensively in various spaces and height, from small spaces with low-celling to large spaces with high-ceiling. Encouraged by our fantastic result of the designing and developments, we have described the overview, the features and the application examples of our new cleanroom system as well as the data analysis and the evaluation results in this article.

OLED lighting development and the future

OLED is one of brilliant electronic devices which have been dramatically developed recent years. These devices are mainly used in the region of display fields such as smartphone screens, large-sized TV screens, and so on. In addition, now, many people are looking these devices into the effective utilization of the Lighting field.
We explain the principles and characteristics of OLED. And describe market development of the OLED lighting, some effective examples, issues in the future.

Characteristics and measures of oil mist generated in automobile factory

In machining plant, a large amount of oil is consumed for lubricating and for cooling the cutting tools and workpieces. Emission of the oil mist in the machining process raises serious problems in occupational health. Oil mist is defined as microscale airborne oil droplets generated by splash of liquid film and/or condensation of vaporized oil substance. In this paper, I will report on the generation situation of oil mist from metal machining process and the solutions to improve the work environment contaminated with oil mist.