Chiller working principle | English | Animation | HVAC

00:05:54
https://www.youtube.com/watch?v=HAxv0T3NVe4

摘要

TLDRThe video explains the working principle of chillers, focusing on their use in large buildings. It highlights two main types of chillers: air-cooled and water-cooled, and explains that, despite their differences, all chillers share four key components: the compressor, condenser, evaporator, and expansion valve. The compressor ensures the flow of refrigerant; the condenser cools the refrigerant using either air or water; the expansion valve decreases refrigerant pressure and temperature; and the evaporator cools water, enabling it to recirculate efficiently. The system operates based on thermodynamic principles, involving continuous heat transfer and refrigerant phase changes, from vapor to liquid and back, to achieve effective cooling.

心得

  • 🏢 Chillers are commonly found in large buildings and come in two main types: air-cooled and water-cooled.
  • ⚙️ Despite the variety of chillers, they all contain a compressor, condenser, evaporator, and expansion valve.
  • 🔄 The compressor plays a key role in circulating the refrigerant throughout the system.
  • 💧 The condenser reduces the refrigerant's temperature using either air or water.
  • 🔻 The expansion valve decreases the refrigerant pressure and temperature by expanding it.
  • 🌡️ The evaporator lowers the temperature of the water returning from the AHU using refrigerant.
  • 🔄 Thermodynamics principles guide the heat transfer between water and refrigerant in chillers.
  • 🔃 The refrigerant changes phases from vapor to liquid and back as it circulates through the system.
  • 💧 The water temperature is carefully managed as it circulates through the chiller, entering and exiting at specific temperatures.
  • ♻️ The cycle involves continuous refrigeration and phase change of the refrigerant.

时间轴

  • 00:00:00 - 00:05:54

    The video introduces the working principle of chillers, specifically focusing on two main types: air-cooled and water-cooled chillers. Despite the variety, all chillers share the same components and working principle: compressor, condenser, evaporator, and expansion valve. The compressor facilitates refrigerant circulation within the chiller. The condenser, using air or water, reduces the refrigerant's temperature. The expansion valve lowers refrigerant pressure and temperature, and the evaporator reduces AHU water temperature using the refrigerant.

思维导图

视频问答

  • What are the main types of chillers discussed?

    The main types of chillers discussed are the air-cooled chiller and the water-cooled chiller.

  • What components are common in all chillers?

    All chillers have a compressor, condenser, evaporator, and expansion valve.

  • What role does the compressor play in a chiller?

    The compressor circulates the refrigerant throughout the chiller system.

  • How does the condenser in a chiller work?

    The condenser reduces the temperature of the refrigerant, using water or air as a cooling medium.

  • What is the function of the expansion valve in a chiller?

    The expansion valve reduces the pressure and temperature of the refrigerant by expanding it.

  • How does the evaporator in a chiller function?

    The evaporator uses refrigerant to lower the temperature of water returning from the AHU, which is then sent back to the AHU.

  • What thermodynamic principle is applied in chillers?

    Thermodynamics principles guide the heat transfer, where high temperature moves to low temperature areas.

  • What happens to the refrigerant as it moves through a chiller?

    The refrigerant changes phases from vapor to liquid as it circulates through the system.

  • Why are specific temperatures important in the chiller process?

    Specific temperatures ensure efficient heat transfer and cooling within the chiller system.

  • Is the chiller process continuous or intermittent?

    The chiller process is continuous, involving ongoing refrigeration and phase changes.

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  • 00:00:00
    In this video
  • 00:00:01
    we are going to discuss about the
  • 00:00:03
    working principle of Chiller
  • 00:00:05
    We can see chillers in the large buildings
  • 00:00:08
    and there are many types of chillers
  • 00:00:11
    But there are commonly two types of chillers.
  • 00:00:14
    One is Air cooled chiller
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    and another one is water cooled chiller
  • 00:00:18
    Although there are many types of chillers
  • 00:00:20
    they all have the same components
  • 00:00:23
    and same working principle.
  • 00:00:25
    Now, Let’s see the main components of the chiller
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    Compressor
  • 00:00:30
    Condenser
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    Evaporator
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    and expansion valve
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    Compressor
  • 00:00:38
    Compressor is an important component in chiller
  • 00:00:42
    This is used to make the refrigerant flow throughout the chiller
  • 00:00:47
    commonly there are four types of compressors
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    They are, Centrifugal compressor
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    Screw Compressor
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    Scroll Compressor
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    and Reciprocation Compressor
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    Next Condenser
  • 00:00:59
    The important job of the condenser is
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    to reduce the temperature of the refrigerant entering it.
  • 00:01:06
    In water cooled chiller
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    we use water to reduce the temperature of the refrigerant
  • 00:01:12
    In air cooled chiller
  • 00:01:13
    we use air to reduce the temperature of the refrigerant
  • 00:01:17
    Next Expansion Valve
  • 00:01:19
    It’s function is simple one
  • 00:01:21
    It reduces the pressure and
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    temperature of the refrigerant
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    by expanding the refrigerant
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    coming from the condenser at high pressure
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    There are four types of expansion valve
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    Thermal Expansion valve
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    Pilot operated thermal expansion valve
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    The electronic expansion valve
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    and Fixed orifice expansion valve
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    Last Evaporator
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    The Evaporator reduces the temperature of the water
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    coming from the AHU
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    with the help of refrigerant and
  • 00:01:51
    sends back to the AHU
  • 00:01:58
    Now, let’s see it’s working principle.
  • 00:02:01
    The compressor sends the refrigerant
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    to the condenser from evaporator
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    which is in the vapor phase
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    The water coming from cooling tower
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    enters the condenser
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    at 32 °C at 32 °C through the copper tubes
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    This water travels throughout the tube.
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    In the condenser refrigerant travels around the copper coils.
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    As per the thermodynamics law
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    the high temperature travels to the low temperature
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    So, as per the law the heat of the refrigerant
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    which flows around the copper coil
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    will transfer to the water
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    which flows inside the copper coils
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    because the refrigerant temperature is higher than the water temperature.
  • 00:02:51
    So, the water temperature will increase.
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    The water comes out from the condenser at 40 °C.
  • 00:03:01
    As the temperature of refrigerant decreases
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    it changes from vapor phase to liquid phase
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    Next the refrigerant travels to the expansion valve.
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    The expansion valve reduces the pressure and temperature
  • 00:03:24
    of the refrigerant which is comes at
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    high pressure and high temperature.
  • 00:03:29
    The second role of the expansion valve is
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    to send the required amount of the refrigerant
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    to the evaporator.
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    A thermal bulb from the expansion valve is
  • 00:03:38
    connected to the outlet of the evaporator
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    with the help of this thermal bulb
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    the expansion valve
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    sends the required amount of refrigerant
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    to the evaporator depending on the
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    temperature of the evaporator outlet
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    Next, the refrigerant will enter into the evaporator
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    The evaporator is also
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    similar to the condenser
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    In the condenser
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    the water from the cooling tower enters through the coil
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    But, in the evaporator
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    the water from the AHU enters through the coil
  • 00:04:08
    the water from the AHU will enter into the evaporator
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    at 12 °C
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    and it will travel throughout the coil
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    The refrigerant that comes in cold
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    from the expansion valve
  • 00:04:19
    surrounds the coil inside the evaporator
  • 00:04:23
    According to the law of thermodynamics
  • 00:04:25
    the heat of the water will transfer to the refrigerant
  • 00:04:28
    because the water temperature is higher than the refrigerant.
  • 00:04:32
    as the heat of the water goes to the refrigerant
  • 00:04:34
    the water cools down and comes out of the evaporator
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    at 6 °C and goes to the AHU
  • 00:04:42
    As the temperature of the refrigerant increases
  • 00:04:44
    the refrigerant evaporates
  • 00:04:46
    and goes to the condenser through the compressor
  • 00:04:49
    This process is continuous
标签
  • Chillers
  • Compressor
  • Condenser
  • Evaporator
  • Expansion Valve
  • Thermodynamics
  • Cooling
  • Refrigerant
  • Large Buildings
  • Heat Transfer