technical NOTES

S.No Performance Parameters UOM Symbol

9 Pressure of air at fan outlet

mm Pfo

10 Pressure drop across the fans

mm oPfan = Pfo - Pfi (2)

11 Fan speed - RPM Nrpm

12 Condenser duty

Kcal/hr Q

Wcond*(Hvap - Hliq)

13 Ambient air temperature

Tamb

14 Effective modified heat transfer

coefficient

Umod

14 Log Mean temperature difference

oC LMTD

(T

ao

– T

ai

) /

logn((T

s

- T

ai

) /

(T

s

– T

ao

))

Advantages Of Air-Cooled Steam Condenser

• Elimination of additional water usage from the condensing power cycle


• Flexibility in power plant site selection


• Decreased time required for plant permitting

Why ‘A’ Frame Condenser

Apex angle approximately 60o

• Higher heat transfer coefficient


• Integral condensation more likely


• Cross-flow design


• Less floor area


• Less distribution duct length


• Easy Drainage of condensate

Why Partition Wall Between Two Modules

To avoid evacuating air when a fan is “off”
Doors are provided in the partition wall to allow free access into air plenum even while
fans are in operation