Longitudinal Ventilation Tunnel and Jet-fan Inverter Control
Longitudinal Ventilation Method with Jet-Fan Inverter Longitudinal ventilation method creates air flow in the tunnel tube with jet-fans and ventilates polluted air. The method is widely employed in Japan and world wide. Aside from the single tube application, longitudinal ventilation method is applied in various ways which include the vertical shaft blower/exhauster longitudinal ventilation, and the concentrated exhauster longitudinal ventilation (Fig. 1).
The jet-fan control system for longitudinal ventilation consists of “instrumentation panel” where sensor signals from VI, CO, AV, Traffic Counter, Fire Detector, Emergency Situation Detector and etc. are gathered, “ventilation control panel” where control SW determines the speed of the jet-fans, and “jet-fan inverter panel” where the electrical voltage is generated to actually drive the jet-fans. Fig. 2 illustrates a conceptual diagram of the jet-fan inverter control system.
Fig. 1 Various Longitudinal Ventilation Methods
Fig. 2 Jet-fan Inverter Control System
PAMPHLET DOWNLOAD
| item / series | 37kＷ-JINV | 37kＷ-JINV | 55kＷ-JINV | 55kＷ-JINV | ||
| Panel Specification | Model | Indoor Self Closed Type | ||||
| Power | Main：3 Phase 3 Wire 460V 50/60Hz Control：Single Phase 100V 50/60Hz |
|||||
| Panel Dimension (Reference) |
Incoming Panel | W700×H2300×D1200mm | W700×H2300×D1200mm | W700×H2300×D1200mm | W700×H2300×D1200mm | |
| Inverter Panel | W1000×H2300×D1200mm | W1200×H2300×D1200mm | W1000×H2300×D1200mm | W1400×H2300×D1200mm | ||
| Inverter Specification | Inverter Capacity | 37kW | 55kW | |||
| Jet-fan Motor Capacity | <33kW | <50kW | ||||
| Input Voltage | 3 Phase 380～480V ±10% | |||||
| Output Voltage | 3 Phase 380～480V | |||||
| Output Frequency | 0～50/60Hz | |||||
| Control Method | PWM Control | |||||
| LFHA (Anti Higher Harmonics） | 3 Phase Bridge with ACL+DCL Conversion Constant k=1.4 | |||||
| 12 pulse input (Smooth Condenser) with ACL+DCL Conversion Constant ｋ=0.7(optional) |
||||||
| Self-Excited 3 Phase Bridge (PWM Converter) Conversion Constant k=0.0(optional) |
||||||
| Cable Length | <2000ｍ | |||||
| JF | 30,33kW×1 | 30,33kW×2 | 50kW×1 | 50kW×2 | ||