This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Thin Ceiling Circulator to Enhance Thermal Comfort and Cabin Space
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
In hot climate regions, there is demand for improved thermal comfort for rear occupants in vehicles not equipped with a rear air conditioner. One solution to this challenge is a circulator mounted on the ceiling. The circulator is a product designed to enhance thermal comfort for occupants by circulating the air in the cabin. The conventional circulator design, which employs a cross flow fan with a large cross section, juts into the cabin space, because it is difficult to package. Consequently, the challenge for the circulator is to provide thermal comfort for rear occupants while taking up the minimum cabin space under the ceiling.
To solve this challenge, that is, to enable a substantially thinner structure, while retaining the same level of air flow delivered as before for the same thermal comfort as the conventional circulator, we divided the structure into an air outlet and an air blower. For the air outlet, it is technically necessary to improve the air flow volume gain factor (= volume of air delivered/volume of air blown out) acting in inducing the air around the outlet. For this reason, we devised a slit-shaped outlet that produces a high-air velocity jet and a guiding surface designed to maintain the high air velocity making use of the Coanda effect. The technical challenge associated with the air blower is to improve fan and motor efficiency in order to ensure a similar level of power consumption to the conventional circulator while achieving a higher pressure from a thinner structure. To meet this challenge, we developed a radial centrifugal air blower integrating a small motor into the fan. The results were that the heights of the air outlet and the air blower were reduced by 50% and 30%, respectively, as compared with the conventional model.
CitationOchiai, T., Oda, S., Sakai, M., and Ishiguro, S., "Thin Ceiling Circulator to Enhance Thermal Comfort and Cabin Space," SAE Technical Paper 2019-01-0913, 2019, https://doi.org/10.4271/2019-01-0913.
Data Sets - Support Documents
|Unnamed Dataset 1|
|Unnamed Dataset 2|
|Unnamed Dataset 3|
- Arai K. 2017
- Honzyo S 1981
- Frederic , N. , Kevin , J.S. 2010
- Rajaratanam , N. Turbulent Jets Elsevier 1976
- Shakouchi , T. Jet Flow Engineering Tokyo Morikita-Syuppan 2004 222
- Ikui , T. , Inoue , M. Turbo-Blowers and Compressors Tokyo CORONA publishing 1988 808
- Sakai , M. , Ochiai , T. , and Mitsuishi , Y. Compact High-Efficiency Blower Fan for HVAC SAE Technical Paper 2010-01-0805 2010 10.4271/2010-01-0805
- Imai , K. , Kataoka , T. , Masuda , T. , and Inada , T. New Evaluation Method of Transient and Non-Uniform Environment in a Passenger Compartment SAE Int. J. Passeng. Cars - Mech. Syst. 5 2 876 884 2012 10.4271/2012-01-0633