Gas Turbine

Topics: Thermodynamics, Pressure, Liquid Pages: 3 (519 words) Published: November 9, 2012
Types of ventilation
- Induced draft ventilation – Turbine ,Acc module - Positive ventilation- LGB, Exhaust

Ventilation System Design features
• Induced Draft Ventilation • Number of compartments • Accessory compartment • Turbine compartment • Aft compartment • Generator Enclosure • 2 X 100 % Roof mounted centrifugal fans • Auto change over • Fan outlet gravity dampers, CO2 dampers and silencers provided • Enclosure Air inlet hoods with filter panels • Slow cool down fan provided for Turbine compartment

Fan sizing Accessory compartment Heat load criteria:
• Q = Heat Rejection = 104000 (BTU/Hr) = 436.8 ( Kcal/min) • Design compartment temp - 600 C at ambient of 430 C • Fan provided : 2 x 10,000 CFM at 3.5 inch WC static pressure • The calculated temp raise with selected air flow 7.80 C • Static Pressure selected considering drop across suction filter, inlet, exit, silencer and ducting

Number of air changes criteria:
• Volume Of the Acc Comp = 278 m3 • Number of Air change/Hr = 60 (Meets NFPA and DEP 31.29.70.31 requirements)

Fan sizing Turbine compartment Heat load criteria:
• Q = Heat Rejection = 1273469 (BTU/Hr) = 5348 ( Kcal/min) • Design compartment temp - 1200 C at ambient of 430 C • Fan provided : 2 x 26,000 CFM at 3.5 inch WC static pressure • The calculated temp raise with selected air flow 300 C • Static Pressure selected considering drop across suction filter, inlet, exit, silencer and ducting

Number of air changes criteria:
• Volume Of the Acc Comp = 215 m3 • Number of Air change/Hr = 185 (Meets NFPA and DEP 31.29.70.31 requirements)

Vent Fan Drawing Typical

Accessory Compartment Fan Curve
• Fan BHP : 5.53 kw • Motor selected- 8 kw • Motor Data: • 4pole - 415V,3Ph TEFC • Motor ambient Temp. 650 C • Insulation class - H ( Temp raise limited to class B) • Flame proof NEC Class 1 Div 2 Gr C&D

Turbine Compartment Fan Curve
• Fan BHP : 15.45 kw • Motor selected- 19 kw • Motor Data: • 4pole - 415V,3Ph TEFC • Motor ambient...
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