Personal Air Conditioning Research Articles

Numerical Simulation of Heat Flow in a Vehicle Cabin Using the Personal Air Conditioning System

The personal air conditioning system is used in the battery electric vehicle instead of the traditional one and the experiment validated that this system can make passengers feel comfort after four minutes. All the system can only consume electric power 338.8 W, which is less than the traditional air conditioning of cabin. A simplified 3-D N box vehicle cabin model was created to simulate the thermal distribution under this system by using the CFD analysis and the results of calculation have good agreement with the experiment recording.

Airflow Control for Personal Air-Conditioning in aPartly Unoccupied Zone using a Multi-Flow Ceiling Cassette Type Packaged Air-Conditioner

There are various demands for air-conditioning in each office space resulting from the variability of thermal distribution caused by a bias of heat sources. Furthermore, individual demands on the thermal environment are diverse. Therefore, it is difficult to satisfy all demands using conventional air-conditioning systems since these assume perfect mixing. Instead, demand may vary with the result that some spaces could be excessively or unnecessarily cooled. This paper examines an airflow and temperature control for personal air-conditioning. This is aimed at providing personal comfort on demand while not unnecessarily cooling unoccupied zones. The method utilizes a multi-flow ceiling cassette type packaged air-conditioner. In this study, thermal comfort and energy performance were analysed using (Computational Fluid Dynamics). From this a personal air control and thermal comfort strategy was developed.

Measurement of Airflow around the Human Body with Wide-cover Type Personal Air-conditioning with PIV

Many existing personal air-conditioning systems cool only specific portions of the human body in the form of spot cooling, using either cooled or fast airflow to control thermal sensation. This may cause various problems related to localized airflow, such as discomfort to the face and neck areas and dryness in the eyes. Therefore, a method is proposed in this research for task area wide-cover type personal air-conditioning that prevents the task area of a human body from being exposed to a largely irregular thermal environment. A particle image velocimeter was used in the research to measure airflow fields for conventional spot cooling and wide-cover type personal air-conditioning (PAC) around the human body. The spot cooling type PAC formed an airflow of 0.3—0.6 m/s around the area of the neck. However, the wide-cover type PAC formed a calmer airflow field of less than 0.18 m · s-1 around the human body. This is because the supply air from a wide-cover type PAC has a higher density than the surrounding air and can extensively cover the human body. Therefore, the wide-cover type PAC can minimize the potential for cold drafts to affect the human body.

Study on inhaled air quality in a personal air-conditioning environment using new scales of ventilation efficiency

A detailed study using computational fluid dynamics (CFD) was conducted on the influence of the difference in the effective diameters of air supply openings (air velocity, assuming the airflow rate to be constant) when using personal air-conditioning (PAC) with isothermal air currents. A new method to analyze the age of air (SVE3*) for individual supplies and the residual lifetime of air (SVE6*) for individual exhausts was developed and proposed. The study focuses on the individual supply openings and exhaust openings in a room with multiple supply openings and exhaust openings when using PAC. PAC with the larger supply opening resulted in less mixture with the surrounding air and a lower age of air than the smaller diameter, which therefore indicated better ventilation characteristics.

CFD Analysis on Inhaled Air Quality with Large Size Supply Opening Personal Air-Conditioning System

CFD Analysis on Inhaled Air Quality with Large Size Supply Opening Personal Air-Conditioning System

CFD Analysis on Examination of Inhaled Air Quality with Wide-Covering Personal Air-conditioning

CFD Analysis on Examination of Inhaled Air Quality with Wide-Covering Personal Air-conditioning

Examination of Personal Air-Conditioning System Covering Wide Area of Task Region

Examination of Personal Air-Conditioning System Covering Wide Area of Task Region

Thermal and Ventilation Characteristics in a Workstation Area by Personal Air-Conditioning System

abstractThis paper investigates thermal and ventilation characteristics in a workstation area of an office building equipped with a personal environmental system. An under-floor air-conditioning system with and without a desk-mounted PEM (Personal Environmental Module) is compared. A tracer gas experiment using SF6 gas is performed to measure the local supply index and the room mean ventilation effectiveness. The particle image velocimetry is utilized to obtain quantitative velocity vectors in the workstation area for various supply air conditions. As a result, the local supply index in the workstation area is found to be increasing by operating a PEM, while overall room ventilation effectiveness remains the same. Flow visualization results show upward buoyant flows for a heating condition, and there is a need to adjust the angle of the PEM diffuser grille.

G-46 顔面局部気流によるパーソナル空調方式に関する研究

G-46 顔面局部気流によるパーソナル空調方式に関する研究