| Title |
Possibility of Demand Controlled Ventilation (DCV) in Multi-Purposed Facilities under the Current Korean Ventilation Standard |
| Authors |
Jeong Jae-Weon ; No Sang-Tae |
| Keywords |
Ventilation Standard ; Demand Controlled Ventilation ; Dedicated Outdoor Air System ; CO2 ; RFID |
| Abstract |
The objective of this paper was to show the possibility of demand-controlled ventilation (DCV) using the current Korean ventilation standard for multi-purposed facilites. Two attractive DCV approaches; CO2-DCV and RFID-DCV were applied to DCV simulations for a theoretical public assembly space served by a dedicated outdoor air system (DOAS) with enthalpy recovery device. A numerical model for predicting realtime occupant number, ventilation rate, CO2 and formaldehyde (HCHO) concentration under given conditions was developed using a commercial equation solver program. It was found that the current ventilation standard causes unstable ventilation system control in DCV applications, especially under CO2-DCV. It is because the ventilation rate (per person) used in Korea is the sum of the outdoor air required to remove or dilute air contaminants generated by both occupant and building itself, and not a pure function of occupant numbers. Finally, it makes DCV control unstable when ventilation flow is regulated only by the number of occupants. In order for solving this problem, current Korean ventilation standard was modified as a form of ASHRAE Standard 62.1-2007 showing good applicability to various DCV approaches. It was found that this modification enhances applicability of the current ventilation standard to DCV significantly and can maintain acceptable HCHO concentration during the whole operating hours. Fan energy Reduction can also be expected from DCV operations. |