• Direct Expansion System

     
     
     
    Direct expansion means that there is no need for a redundant coolant loop and that the refrigerant directly cools the desired payload via a cold plate.
     
     
    Direct expansion systems in refrigeration systems have been growing rapidly because of their simplicity of construction, their ability to get rid of most ductwork and piping, and their ease of integration into the user's equipment. Nowadays direct expansion systems are widely used because the installation work becomes easier and reduces the cost of the entire system for the user.
     
     
    RIGID DX evaporator system is directly in contact with the user's evaporators like a cold plate. In fact, with no secondary coolant needed, the system only requires minimal parts. It is not necessary to circulate cool air or to circulate coolant with fans or pumps. Complexity and inefficiency are added by these additional components. Additional thermal resistance is induced by the second coolant (air or liquid) and it adds heat to the cooling system, reducing net cooling capacity.

  • Advantages of Direct Expansion System

    Easy to install, Ease to test, Ultra-compact size, Minimum ceiling or wall space needed.

     

    Low installation costs

     

    Reduced install expenses, No worry of maintenance.

    Sine Wave Drive Borad

     

    Ease to test, adjust and balance the system.

    Brushless DC Rotary Compressor

     

    Battery or dc power supply, Low energy consumption.

    Tiny Size & Smallest Footprint

     

    Easy to integrate into user devices, low noise level.

  • Direct Expansion System, DV1910

    Direct Expansion System, DV1910

    Capacity: 450W (1,535Btu)

    • 12V DC
    • 3.5 kgs/7.7lbs
    • Refrigerant: R134A
    • Working Amps: 1~8A, (Maximum 10A)
    • Size: 190x160x138 mm (7.48x6.3x5.43 inch)
    • Mini DC compressor cooling module
    • 12V mini compressor to enable peak performance
    • Drive board is included
    Benefits: Compact, light, competitive price, high heat transfer rate, adaptable/configurable highest heat transfer rate, low installation costs.
     
     
     
    Direct Expansion System, DV1920

    Direct Expansion System, DV1920

    Capacity: 450W (1,535Btu)

    • 24V DC
    • 3.5 kgs/7.7lbs
    • Refrigerant: R134A
    • Working Amps: 1~7A, (Maximum 8.5A)
    • Size: 190x160x138 mm (7.48x6.3x5.43 inch)
    • Mini DC compressor cooling module
    • 24V mini compressor to enable peak performance
    • Drive board is included
    Benefits: Compact, light, competitive price, high heat transfer rate, adaptable/configurable highest heat transfer rate, low installation costs.
     
     
     
    Direct Expansion System, DV1930

    Direct Expansion System, DV1930

    Capacity: 450W (1,535Btu)

    • 48V DC
    • 3.5 kgs/7.7lbs
    • Refrigerant: R134A
    • Working Amps: 1~4A, (Maximum 7.5A)
    • Size: 190x160x138 mm (7.48x6.3x5.43 inch)
    • Mini DC compressor cooling module
    • 48V mini compressor to enable peak performance
    • Drive board is included
    Benefits: Compact, light, competitive price, high heat transfer rate, adaptable/configurable highest heat transfer rate, low installation costs.
     
     
     
    Direct Expansion System, DV3220

    Direct Expansion System, DV3220

    Capacity: 550W (1,876Btu)

    • 24V DC
    • 4.0 kgs/8.8lbs
    • Refrigerant: R134A
    • Working Amps: 1~10.3A, (Maximum 12.5A)
    • Size: 190*190*182mm (7.48x7.48x7.17inch)
    • Mini DC compressor cooling module
    • 24V mini compressor to enable peak performance
    • Drive board is included
    Benefits: Compact, light, competitive price, high heat transfer rate, adaptable/configurable highest heat transfer rate, low installation costs.
     
  • Direct Expansion System Drawing

     

     

    RIGID Direct Refrigerant Cooling Evaporator System Advantages (Direct Expansion Cooling) over Liquid Chillers

    Features of Direct Expansion System
    • 12V / 24V / 48V DC 
    • Low installation costs.
    • Lightweight and small size.
    • Low energy consumption.
    • Lower maintenance costs.
    • Low operating noise (45dB).
    • Can be battery, DC powered operation
    • Easy to test, adjust and balance end user's system.
    • Individual sections can operate without running the entire system.
     
    RIGID direct expansion evaporator system consists of the basic fours components of a vapor compression refrigeration system: a compressor, a condenser, an expansion part, and an evaporator (optional).
     
    RIGID direct refrigerant cooling evaporator system advantages over liquid chillers.
  • Direct Expansion Refrigeration System Cycle

     

     

    DX System Cooling Cycle

    The way direct expansion systems work is that the direct expansion system can be connected directly to the customer's evaporator.

     

    The evaporator is located in the space to be cooled. As the refrigerant in the evaporator coil expands, it cools that space by absorbing heat from the space.

     

    Mini-refrigerators, laboratory equipment cooling, precision instrument cooling, and equipment requiring direct refrigerant cooling packages are examples of such systems.

    The liquid refrigerant is handled by a flow control device, which can be a thermal expansion valve or a capillary tube.

     

    The receiver of direct expansion system is located after the compressor, where the high pressure and high-temperature liquid refrigerant is stored. This liquid flows from the receiver through the liquid line to the refrigerant flow control device.

     

    The liquid high pressure is then reduced to the evaporator pressure as it passes through the flow control. This is so that the saturation temperature of the refrigerant entering the evaporator will be lower than the refrigeration space.

     

    As the liquid passes through the flow control device, a portion of the liquid vaporizes, lowering the liquid temperature to the evaporating temperature.

    RIGID Cooling - Direct Expansion Evaporator

    The RIGID direct expansion system can be connected with a cold plate, which acts as an evaporator. When the cold plate is placed on the part to be cooled, the cold plate absorbs and disperses heat from the part into the heat transfer fluid. Cold plates are used in a wide range of electronic cooling applications in many process industries.

  • Direct Expansion Evaporator System Applications

     
     
    RIGID Direct Expansion Evaporator System is a set of miniature refrigeration modules directly cooled by refrigerants, using RIGID's miniature compressor technology to provide the user with the most compact cooling solution.
     
     
    The miniature direct expansion systems can be easily integrated into a final solution that is compact, quiet, reliable and economical. Users can integrate expanded cold plates directly into our expansion systems to achieve space-specific cooling or temperature control.
     
     
    RIGID direct expansion systems are used in a wide range of applications. For example, mini-fridge, industrial, medical, scientific, lasers, instruments, and other active thermal managements, where the cold plate is mounted directly on it. The temperature can be controlled with high precision, +/-0.5°C. With RIGID mini compressor, extremely compact systems can be designed for high heat flux applications in electronics cooling, batteries, laboratory cold plates, etc.

    Cold Plate Refrigeration

    Beverage Cooler

    Outdoor Freezer

    Outdoor Refrigerator

    Electronics Battery

    Cold Plate Cooling

    Precise Instrument

    Laboratory Equipments

  • Advantages of Direct Expansion Cooling VS Liquid Cooler & Thermoelectric Technologies

     

     
    In direct refrigerant cooling, the refrigerant flows directly through the evaporator or customer cold plate. In RIGID Expansion evaporator system, the circulation is driven by our patent miniature dc compressor. The advantages are very clear. This method eliminates the need for a liquid recirculation pump, water tank, and associated piping and connectors - all sources of failure and leakage.
     
     
    Compared to commercially available liquid coolers, RIGID's DX expansion cooling system is 20 times smaller and 20 times lighter. Efficiency is improved by eliminating the losses associated with cooling liquids and the energy savings of driving the pump. The cooling capacity of the direct refrigerant is 45% greater than that of the liquid cooler.
     
     
    The system is greatly simplified to avoid fluid leakage and improve reliability with an average life of 90,000 hours. The system is sealed at the plant and essentially maintenance-free. Direct expansion cooling greatly simplifies system configuration and provides maximum efficiency. This is the ideal configuration for many laser, semiconductor and medical device applications.
     
     
    To learn more about this technology and to see a variety of applications. For a free evaluation of your project, please contact us today. Thank you.

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  • FAQ

    Direct Expansion Evaporator System Unit Frequently Asked Questions

    This FAQ is for Direct Expansion System. More details? Pls Go Here!

    1. What is direct expansion system?

    Direct Expansion means that the refrigerant expands to produce the cooling effect in a coil that is in direct contact with the conditioned air that will be delivered to the space.

    2. What is Direct Expansion Evaporatorin mechanical engineering?

    A direct expansion refrigeration unit, also known as a condensing unit, uses condensed refrigerant liquid to cool the air in a given space. It is widely used in micro refrigeration, small refrigerators, mobile freezers, medical, laser, precision instruments, laboratory equipment, etc.

    3. What is expansion system?

    A direct expansion system enables the most compactly designed refrigerant system. A direct expansion system eliminates the use of a secondary coolant loop and uses the refrigerant to directly cool the desired payload via a cold plate. In a DX system, the evaporator absorbs heat directly from the payload.

    4. How does a direct expansion system work?

    The expansion parts (valve or capillary) controls the flow of refrigerant into the evaporator coil. Hot air is extracted from the specific space and blown over the heat exchange coil by the evaporator/indoor fan. The refrigerant in the coil absorbs the heat and expands. This lowers the temperature of the air being blown into the space/room.

    5. What is the difference between indirect and direct cooling system?

    In cooling systems, the distribution can be either direct or indirect. If direct, the cooling water goes directly into the internal piping system of a building. In an indirect system, a heat exchanger separates the internal from the external system.

    6. What is the difference between DX system and chilled water system?

    The immediate and most noteworthy difference between these two units is that the DX (direct expansion) unit cools air, and the chiller units cool water. Chiller units cool water for use in other liquid systems like chilled water handlers.

    7. What is the main function of an expansion valve or capillary?

    The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. The high-pressure liquid refrigerant entering the expansion valve is quite warm.

    8. How many types of RIGID HVAC refrigeration systems?

    There are 4 types of refrigeration systems:


    1. Micro DC Aircon (Air Cooling)
    2. Plate Liquid Chiller (Liquid Cooling)
    3. Coaxial Liquid Chiller (Liquid Cooling)
    4. Coil Liquid Chiller (Liquid Cooling)
    5. Direct Expansion System (DC Condensing Unit)

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