After Uts 4.Unlocked

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VENTILASI TAMBANG

2 Desember 2014 Hendra Harisman, ST., M.Eng.

JTP 505 2 SKS


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OUTLINES

VENTILATION NETWORK ANALYSIS

Introduction

Airways in series and parallel

Resolving networks into parallel and series airwa


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Introduction

VENTILATION NETWORK ANALYSIS

Means the calculation of resistance quantity anpressure in interconnected networks of discrete

Used to predict the performance of mine ventilanetworks, location of regulators and requiremensurface and or underground fans


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Introduction

Questions for ventilation engineers:

What configuration of airways and fan duties arrequired to meet design requirement?

How will various design options (number of headshafts, additional connections) affect circuitperformance?

How will the c ircuit perform with time as the minexpands or changes?


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Introduction

Questions for ventilation engineers:

What physical ventilation devices should be in p(regulators or stoppings) in order to control thedistribution of air within the ventilation c ircuit

Can observed pressure differentials and quantitdistribution be reconciled with predictive mode


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Airways in series & parallel

The first step in understanding ventilation netwo

analysis is to be able to determine frictional preslosses in individual airways and simple combinairways.

The resistance to airflow for individual airways iscalculated from the density corrected Atkinson

equation together with allowance for shock orobstruction losses.

The result of these calculations is a resistance valuNs2/m8 for each airway and a relationship betwefrictional pressure loss and quantity of air in the a


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Airways in series:

Quantity of air in each airway is the same

The total frictional pressure loss is given by the sum opressure losses in each airway


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Airways in series:

Total resistance, Rtot, is given by the sum of individua

resistances.


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Airways in series: Example

Airway 1 has resistance of 0.09 Ns2/m8 and airway 2resistance of 0.08 Ns2/m8

What is the frictional pressure loss for one of each aseries and an air quantity of 85 m3/s?


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Airways in parallel:

Pressure differential between the start and end of eairway is the same

Quantity of each airway depends on individual airwresistance


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Pressure differential is common to all airways Quantity of each airway:


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Airways in parallel: Example

Airway 1 has resistance of 0.09 Ns2/m8 and airway 2resistance of 0.08 Ns2/m8

What is the frictional pressure loss for one of each aparallel and an air quantity of 85 m3/s?

How much air is in each airway?


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Resolving networks into parallel and series airways

A network or part of a network can be resolved

parallel or series airwaysThe solution can be obtained by applying the ru

equations described above.

The main problem in applying these techniquesnetworks is the ability to visualize the various parand series paths when the mine is drawn to refleactual geometry.


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Resolving networks into parallel and series airways

Rearranging Mine Networks

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