Energy-saving · High-efficiency | Laboratory High-Exhaust Fan System XFSY-CG Series

01 

 XFSY-CG Fan Principle        

    The XFSY-CG laboratory high-efficiency exhaust fan system employs a unique vertical discharge design. This effectively agitates and draws in surrounding air to dilute laboratory exhaust gases, thereby reducing the concentration of emitted pollutants.     Crucially, the introduction of ambient air enhances both the mass flow rate and velocity within the XFSY-CG exhaust hood. This provides the nozzle with significantly increased kinetic energy for discharge, ultimately ensuring that exhaust gases are diluted and vented at a height above the roofline.

02 

 XFSY-CG Fan Technical Principles   

     The XFSY-CG laboratory high-efficiency exhaust fan system is responsible for diluting contaminated air within the laboratory and discharging it to elevated areas above the laboratory roof. Laboratory exhaust gases are first diluted by bypass air before entering the mixing air plenum.

    The XFSY-CG laboratory high-efficiency exhaust fan system is responsible for diluting contaminated air within the laboratory and discharging it to an elevated area above the laboratory roof. Laboratory exhaust gases are first diluted by bypass air before entering the mixing air plenum.

The mixed air is driven by the fan and delivered into the discharge nozzle. Within the discharge nozzle, the air velocity is significantly increased until it reaches its maximum speed. This process creates a low-pressure zone, thereby efficiently inducing the inflow of external air around the base of the hood.

This induction mechanism significantly enhances the dilution of laboratory exhaust gases. After thorough mixing and dilution with the induced airflow, the gases are discharged into the atmosphere at a high velocity, thereby achieving effective pollution control.

QA = Bypass air volume 

QB = Induced air volume 

QC = Fan air volume 

QD = Laboratory exhaust air volume (contaminated air) 

QE = Total air volume 

QE = Qs + Qc 

Qc = Q* + Q

 Q = Qв + QA + Qo 

Dilution Ratio = D.R = QE/Qo

 Entrainment Ratio = E.R = Q / Qc

△ Bypass Air Bypass air refers to ambient air flowing through the bypass air mixing chamber, which combines with laboratory exhaust gases to enhance dilution efficiency and increase the total air volume of the laboratory's high-efficiency exhaust ventilation system. Within variable air volume systems, bypass air is crucial for maintaining constant outlet airflow. It is also employed to augment the overall exhaust volume and dilution ratio of the ventilation system, thereby ensuring effective emissions control.

△Exhaust nozzle     The exhaust nozzle is positioned within the fan casing to direct airflow outwards and accelerate its velocity upon entering the hood. All models within the XFSY-CG laboratory high-efficiency exhaust fan series can be fitted with compatible exhaust nozzle configurations tailored to the customer's specific operational requirements.

△Dilution Ratio     The ratio of the total fan outlet air volume to the laboratory exhaust air volume (total air volume / laboratory exhaust air volume). 

△Exhaust air deflector     The exhaust air deflector directs the exhaust air discharged from the fan casing for emission, inducing dilution air during this process. 

△Induced air     Induced air refers to the air drawn in through the hood (induced flow) and mixed with laboratory exhaust air to enhance the dilution ratio and stack lift height.

03 

Calculation of Effective Surge Capacity for XFSY-CG Fans

HA = HB + HC 

HA = [0.91 × (V × D / U)] + HC 

HA = Actual XFSY-CG high-discharge fan system surge volume (m) 

HB = Exhaust gas lift height (m) 

HC = Chimney height (roof to exhaust hood outlet height) (m) 

V = Exhaust hood outlet velocity (m/s)

 D = Exhaust hood outlet diameter (m)

 U = Crosswind velocity (m/s) 

Equation extracted from XF Laboratory Design Guidelines, Equation 9-2. Note: Lift calculation is typically based on crosswind conditions of 4.47 m/s.

04

Advantages of the XFSY-CG Fan

△ Impeller: The XFSY-CG series exhaust fans feature fully mixed-flow impellers (Wind Chaser). This impeller design achieves energy-efficient operation, maintaining high-efficiency exhaust emission under medium-to-high static pressure conditions. Its low-noise design reduces noise levels by 5-20 decibels compared to duct centrifugal or axial fans.

△Fan Assembly 

·Energy-efficient, high-performance, aesthetically pleasing, environmentally friendly The scientifically designed exhaust elevation ensures building aesthetics remain unaffected. Laboratory exhaust gases undergo significant dilution, effectively reducing pollutant concentrations. Features advanced silent fan technology paired with high-quality, high-efficiency motors. The system incorporates variable fan speed regulation to accommodate static pressure fluctuations and future performance requirements. Optimised discharge nozzle design enhances exhaust efficiency. 

· Robust and Safe Sturdy belt drive system. SPARKC explosion-proof structure compliant with European and American CE standards. Fan shaft bearing life expectancy (L10) up to 100,000 hours. Epoxy resin-coated housing for enduring protection. 

·Convenience The XFSY-CG fan suits constant or variable volume exhaust systems with minimal footprint. Whether deployed singly or in multiples, the XFSY-CG series exhaust fans flexibly match diverse operational requirements. Drive components are designed for easy inspection and maintenance, ensuring operational convenience. The separated casing and motor design positions the belt drive and bearings outside the contaminated airflow, facilitating maintenance while ensuring safety and reliability. The XFSY-CG fan integrates seamlessly into existing systems, making it ideal for retrofitting and upgrades. 

· Component Structure Overview The casing is constructed from high-strength steel plate using welding technology. A diverse range of colour options is available to meet different requirements. Lifting lugs and protective covers are meticulously manufactured from stainless steel or alloy galvanised steel plate with a carefully applied coating finish.