Longitudinal Ventilation Tunnel and Jet-fan Inverter Control

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

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
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