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    Mine Ventilation Lab

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    zafar abbas
    Underground mine ventilation provides airflow to dilute gases, regulate temperature, and remove dust. Various instruments are used to measure air pressure, flow, and humidity in mines. These include barometers, anemometers, psychrometers, manometers, and hygrometers. They operate using principles such as evaporation, thermal conduction, fluid pressure balancing, and electrical heating to determine measurements that are important for mine worker safety and operations.

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    Mine Ventilation Lab

    Uploaded by

    zafar abbas
    168 views6 pages
    Underground mine ventilation provides airflow to dilute gases, regulate temperature, and remove dust. Various instruments are used to measure air pressure, flow, and humidity in mines. These include barometers, anemometers, psychrometers, manometers, and hygrometers. They operate using principles such as evaporation, thermal conduction, fluid pressure balancing, and electrical heating to determine measurements that are important for mine worker safety and operations.

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    Underground mine ventilation provides airflow to dilute gases, regulate temperature, and remove dust. Various instruments are used to measure air pressure, flow, and humidity in mines. These include barometers, anemometers, psychrometers, manometers, and hygrometers. They operate using principles such as evaporation, thermal conduction, fluid pressure balancing, and electrical heating to determine measurements that are important for mine worker safety and operations.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    168 views6 pages

    Mine Ventilation Lab

    Uploaded by

    zafar abbas
    Underground mine ventilation provides airflow to dilute gases, regulate temperature, and remove dust. Various instruments are used to measure air pressure, flow, and humidity in mines. These include barometers, anemometers, psychrometers, manometers, and hygrometers. They operate using principles such as evaporation, thermal conduction, fluid pressure balancing, and electrical heating to determine measurements that are important for mine worker safety and operations.

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    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 6

    Lab report:01

    Introduction of mine ventilation and its equipment

    Cistern barometer

    A barometer is a scientific instrument that is used to measure air pressure in a certain


    environment. Pressure tendency can forecast short-term changes in the weather. Many
    measurements of air pressure are used within surface weather analysis to help find surface troughs,
    pressure systems and frontal boundaries.
    Advantages:
    In fact, an aneroid barometer is found to be less accurate when compared with a
    mercury barometer. But the advantage in an aneroid barometer is the quick and easy handling
    of the instrument. It can be carried from one place to another without any apprehension of damage
    to the instrument whereas this is not possible in the ...Jan 12, 2018
    What is aneroid barometer and its uses?
    Noun. A device for measuring atmospheric pressure, often specially calibrated for use as an
    altimeter, consisting of a box or chamber partially exhausted of air, having an elastic top and a
    pointer to indicate the degree of compression of the top caused by the external air.
    A device for measuring atmospheric pressure, often specially calibrated for use as an altimeter,
    consisting of a box or chamber partially exhausted of air, having an elastic top and a pointer to
    indicate the degree of compression of the top caused by the external air.

    Analogue
    Barometer. ... An altimeter is intended to be used at different levels matching the corresponding
    atmospheric pressure to the altitude, while a barometer is kept at the same level and measures
    subtle pressure changes caused by weather and elements of weather.
    An altimeter is an instrument used in aircraft to measure the height above sea level. Incorporated
    into an altimeter is a pressure-sensing function that works similar to a barometer.
    The altimeter measures altitude through comparison of air pressure as an aircraft climbs or
    descends

    Can a barometer be used as an altimeter?


    A non-liquid barometer called the aneroid barometer is widely used in portable instruments and
    in aircraft altimeters because of its smaller size and convenience. ... The concept of altitude above
    sea level, based on barometric pressure, is used to create one type of aircraft altimeter.
    Annometer
    A tube anemometer uses air pressure to determine the wind pressure, or speed. A
    tube anemometer measures the air pressure inside a glass tube that is closed at one end. By
    comparing the air pressure inside the tube to the air pressure outside the tube, wind speed can be
    calculated.
    What is the principle of anemometer?
    It determined wind velocity by measuring the decrease or increase in sound waves traveling
    between two transducers. A tachometer is an electromechanical device which converts mechanical
    energy into electrical pulses to give a digital readout of the speed of a motor. A
    digital anemometer works on the same principle

    Vane Anemometers
    work on the principle that a freely turning turbine will rotate at a speed directly proportional to
    the wind speed. Vane Anemometers cover ranges as low as 0.15 m/s and as high as 40 m/s, or
    even higher by special order.
    Purpose
    vane anemometer. A portable instrument used to measure low wind speeds and airspeeds in large
    ducts; consists of a number of vanes radiating from a common shaft and set to rotate when facing
    the wind

    Hot Wire Anemometer.


    Definition:
    The Hot Wire Anemometer is a device used for measuring the velocity and direction of the fluid.
    This can be done by measuring the heat loss of the wire which is placed in the fluid stream.
    The wire is heated by electrical current.

     Hot-anemometers are popular for unsteady flow of gas and liquid flow measurement. The
    basic system consists of electrically heated wire suitably is liquid. ... And this changes the
    current through the hot wire for a constant voltage. Flow can
    be measured by measuring the change in the resistance or current.
     The hot wire anemometer is used to measure fluid velocities by measuring heat loss by
    convection from a very fine wire which is exposed to the fluid stream. The wire is
    electrically heated by passing an electrical current through it

    sling psychrometer

    The sling psychrometer is used to measure relative humidity. This is one of the simpler designs
    of psychrometers available on the market. It consists of two thermometers, a wet bulb, and a dry
    bulb. These are attached on to a frame which has a string or light chain in the middle.purpose
    A psychrometer measures the relative humidity in the atmosphere through the use of two
    thermometers: a dry bulb thermometer, is used to measure the temperature by being exposed to
    the air. a wet bulb thermometer, measures temperature by having the bulb dipped in a liquid.
    Sir John Leslie (1776-1832), a reputed meteorologist of his time, is credited with the invention of
    the sling psychrometer. The term 'psychrometer', however, was first used in the year 1818 by
    German inventor Ernst Ferdinand August.

    Battery Operated Psychrometer


    quickly and easily measures wet-bulb and dry-bulb temperatures. These can be converted into
    relative humidity or dew point temperature using a chart on the instrument face,
    a psychrometric slide rule (provided), or tables (also provided) for a more accurate determination.
    What is a psychrometer used for?
    A psychrometer measures the relative humidity in the atmosphere through the use of two
    thermometers: a dry bulb thermometer, is used to measure the temperature by being exposed to
    the air. a wet bulb thermometer, measures temperature by having the bulb dipped in a liquid.Se
    What is the principle of a psychrometer?
    How does a psychrometer work?
    A psychrometer is the simplest kind of hygrometer—a device for measuring humidity. It consists
    of two bulbs with thermometers: a wet bulb and a dry bulb. The dry bulb is simply left exposed to
    the air to measure the temperature. The wet bulb is covered with a cloth wick and dipped in water
    until it is ready to use.
    What is the use of thermo hygrometer?

    Thermo hygrometers
    are useful for measurements of humidity. Humidity is a representation of the concentration of
    water vapour in the air where the value is shown as a percent. Thermo hygrometers have sensors
    which measure humidity of the air and temperature of the air.
    What is the purpose of a hygrometer?
    Hygrometer,
    instrument used in meteorological science to measure the humidity, or amount of water vapour in
    the air. ... The psychrometer (q.v.) is a hygrometer that utilizes two thermometers—one wet-bulb
    and one dry-bulb—to determine humidity through evaporation.

    What is the working principle of hygrometer?


    Wet bulb plays main role in the measurement of the humidity. Hygrometer works on the
    phenomenon called evaporative cooling. When water evaporates from any surface, it becomes cool
    because water molecules take heat energy from the surface during the evaporation.

    Mine ventilation
    is a significantly important aspect of underground mining. Improved ventilation clears methane
    and other toxic gases found in coal and metal mines, removes fumes from blasting, and exhausts
    diesel fumes produced by equipment.
    Underground mine ventilation provides a flow of air to the underground workings of a mine of
    sufficient volume to dilute and remove dust and noxious gases and to regulate temperature. The
    source of these gases are equipment that runs on diesel engines, blasting with explosives, and the
    orebody itself.

    What is the main purpose of mine ventilation?


    Underground mine ventilation provides a flow of air to the underground workings of a mine of
    sufficient volume to dilute and remove dust and noxious gases (typically NOx, SO2, methane,
    CO2 and CO) and to regulate temperature.

    Digital manometer
    They can also be used for single pressure. ... Digital Manometer can be used to measure low
    pressure. Constructed of extruded aluminum case. Series HM35 Up to 0.05% Accuracy, Graphical
    Display, Data Logging Capability. Precision Digital Pressure Manometer is designed to measure
    and log pressure measurements.

    What can a manometer be used for?


    A manometer is a scientific instrument used to measure gas pressures.
    Open manometers measure gas pressure relative to atmospheric pressure. A mercury or
    oil manometer measures gas pressure as the height of a fluid column of mercury or oil that the
    gas sample supports.

    What are the advantages of manometer?


    The manometer measures unknown pressure by balancing it against gravitational force of liquid
    heads. It can be used to mesure dynamic pressures and differential pressures. It can measure
    pressure ranging from low to high (0.1 NM/m2).
    here are several advantages of using electronic manometers. An electronic manometer is
    portable and more compact than the old fluid-filled types. The electronic manometer is more
    accurate and provides a greater resolution than older versions, and a digital display is easier to
    read.

    There are some disadvantages of inclined monometer which are given below.
     The inclined monometer has no over range protection.
     It has lack of portability.
     A major disadvantage of the manometer is it has slow response, which makes it unsuitable for
    measuring fluctuating pressures.
    Jul 22, 2017

    The manometer's inclined angle provides many advantages. A small or low amount of pressure
    against the inclined manometer will produce a large liquid movement relative to the tube's
    graduations. As a result, the graduation scale can be very precise--down to a hundredth of an inch
    accuracy.

    Advantages of mercury barometer:


     It is the heaviest liquid. Therefore it rises to a height of only 76 cm to balance the atmospheric
    pressure. 2) It gives more accurate reading as it does not stick to the glass. 3) It is opaque and
    shiny and hence can be seen easily through glass.
     What are the disadvantages of mercury barometer?
    Disadvantage of mercury barometer

     Bulky and fragile.


     Hard to get reading under hard conditions.
     Glass tube break easily

    Advantages of Psychrometers:

    1. Low cost
    2. Excellent portability
    3. Reliable
    4. Easy to use
    Disadvantages of Psychrometers:

    1. May be fragile, though rugged units are now available for use in harsh environments
    2. Repeatability can be dependent on user and user interpretation of temperature
    measurements
    3. Mercury hazard, as some older products may contain mercury in the thermometer
    components of the instrument
    4. Potentially poor resolution, though digital psychrometers offer better resolution than
    analog units

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