Air Change Rate Control of Ventilated Ceiling concerning Heat Load in Commercial Electrical Kitchen

Ventilated ceiling system is an energy-saving replacement ventilation system for maintainingcomfortable working environment in kitchens. The technology was introduced fromGermany, but there have been no clearly determined relationships between their designs in anelectric kitchen and the ventilation design standards and no established design methods. Thisstudy aims to establish design methods of ventilated ceiling systems appropriate for electrickitchens by assessing the thermal environment created and energy consumed by the systemswhile changing the amount of ventilation and the temperature of the air supplied. Theventilated ceiling system formed thermal stratification, which improved displacementventilation, and maintained a good thermal environment in the working area. To meet thestandards of the Ministry of Health, Labour and Welfare, the system should be operated at aventilation rate of 25 times per hour with supply air at 16oC or a ventilation rate of 20 to 40times per hour with supply air at or below 20oC.