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DESIGN AND CONSTRUCTION OF AN INDUCTION FURNACE (COOLING SYSTEM). Presented by MG THANT ZIN WIN Roll No: Ph.D-M-7. Supervisors : Dr Mi Sandar Mon Daw Khin War Oo. 1 st Integrated Seminar 16.2.2004.

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slide1

DESIGN AND CONSTRUCTION OF AN INDUCTION FURNACE(COOLING SYSTEM)

Presented by

MG THANT ZIN WIN

Roll No: Ph.D-M-7

Supervisors : Dr Mi Sandar Mon

Daw Khin War Oo

1st Integrated Seminar 16.2.2004

cooling systems for electric induction furnace
Cooling Systems for Electric Induction Furnace
  • Cooling Pond System
  • Open-circuit System with Evaporative Cooling Tower
  • Spray Pond System
  • Fan-radiator (Closed-circuit) System
  • Dual System with Water/Water Heat Exchanger
  • Dual System with Closed-circuit Cooling Tower
cooling pond system
Cooling Pond System

It is used in UNIDO induction furnace.

  • Advantages
  • Simplicity
  • Small investment
  • Low noise control
  • Disadvantages
  • Large ground area
  • Less effective in warm ambient conditions
  • Not suitable for continuous thermal duty
open circuit system with evaporative cooling tower
Open-circuit System with Evaporative Cooling Tower

Pump

Furnace

and Ancillaries

Buffer Tank

Cooling

Tower

Pump

Fig – Open-circuit system with evaporative cooling tower

types of cooling tower
Types of Cooling Tower

Natural Circulation

Cooling Tower

Mechanical Draft

Cooling Tower

Forced Draft

Induced Draft

Atmospheric

Natural Draft

Counterflow

Crossflow

slide6

(b) Forced Draft

(a) Induced Draft

(d) Natural Draft

(c) Atmospheric

Fig - Common Types

of Cooling Tower

(f) Crossflow

(e) Counterflow

mechanical draft counterflow cooling tower
Mechanical Draft Counterflow Cooling Tower

Outlet Air

  • Function
  • Principles

Water

Inlet Air

Inlet Air

Fig – Illustration of a counterflow tower

cooling tower theory
Cooling Tower Theory

Heat is transferred from water drops to the surrounding air by the transfer of

sensible and latent heat.

Fig – Water drop with interfacial film

merkel equation
Merkel Equation

Tower characteristic value,

where,

K = mass transfer coefficient, lb water/ (h.ft2)

a = contact area, ft2/ft3 tower volume

V = active cooling volume, ft3/ft2 of plan area

L = water rate, lb/ (h.ft2)

hw = enthalpy of air-water vapor-mixture at bulk water temperature,

Btu/lb dry air

ha = enthalpy of air-water vapor-mixture at wet bulb temperature,

Btu/lb dry air

graphical representation of tower characteristic
Graphical Representation of Tower Characteristic

Fig – Cooling tower process heat balance (Markey Co)

example calculation
Example Calculation

KaV/L = ?, Hot water = 105°F, Cold water = 85°F,

Ambient web bulb temperature = 78°F, L/G = 0.97

From air-water vapor-mixture tables,

h1 (entering air) at 78°F wet bulb temperature = 41.58 Btu/lb

h2 (leaving air) = 41.58 + 0.97(105-85) = 60.98 Btu/lb

nomograph method
Nomograph Method

Hot water = 100°F,

Cold water = 80°F,

Wet bulb temp: = 70°F,

L/G = 1

So, (KaV)/L = 1.42 #

Fig - Nomograph of cooling tower characteristics

[Wood and Belts, Engineer, 189(4912), 337 (1950)]

summary for cooling towers
Summary for Cooling Towers
  • A change in wet bulb temperature (due to atmospheric conditions) will not change the tower characteristic (KaV/L).
  • A change in the cooling range will not change KaV/L.
  • Only a change in the L/G ratio will change KaV/L.