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New apparatus at O’Hare

Gordon J. Nord, Jr. captured a series of striking images at O'Hare International Airport, showcasing four new ARFF (Airport Rescue and Firefighting) units from Oshkosh. In addition to the main fleet, he also got an exclusive look at 9-2-4, the newly introduced mobile ventilation unit, which is set to enhance emergency response capabilities at the airport. In one photo, 6-5-3 is seen in action, with its bumper turret spraying water as part of a training exercise. The image highlights the powerful performance of the new ARFF model, which is stationed at Rescue 1. Another shot shows 6-5-3 in motion, moving out from Rescue 1, demonstrating its mobility and readiness for rapid deployment. 6-5-7, another member of the new fleet, is also based at Rescue 1, reinforcing the airport’s ability to respond quickly to emergencies. Meanwhile, 6-5-4 can be found at Rescue 3, while 6-5-5 is stationed nearby, both positioned in the mid-field area for optimal coverage. These units are critical for ensuring swift and effective fire response across the vast O’Hare campus. Further out, 6-5-9 is located at Rescue 4, which is housed in the old north fire station off Touhy Avenue. This strategic placement ensures that the airport's fire department can cover all key areas efficiently. Finally, the new mobile ventilation unit, 9-2-4, was spotted in action, offering advanced airflow control during fires or hazardous material incidents. This innovative tool is expected to significantly improve firefighter safety and operational efficiency. These photos offer a rare glimpse into the modernization efforts taking place at O’Hare’s fire department, highlighting the importance of updated equipment in maintaining the highest standards of airport safety.

Heat Exchange Unit

Heat exchange units, also known as heat exchangers, are devices designed to transfer heat between two or more fluids without mixing them. They are widely used in various industries, including HVAC, power generation, chemical processing, and refrigeration. Below is a classification of heat exchange units based on their design and operation:

1. Based on Flow Arrangement

  • Parallel Flow (Co-current Flow):

    • Both fluids flow in the same direction.

    • Temperature difference is highest at the inlet and decreases along the length.

  • Counter Flow (Counter-current Flow):

    • Fluids flow in opposite directions.

    • Maintains a more uniform temperature difference, leading to higher efficiency.

  • Cross Flow:

    • Fluids flow perpendicular to each other.

    • Commonly used in air-cooled heat exchangers.

      2. Based on Construction and Design

      • Shell and Tube Heat Exchanger:

        • Consists of a series of tubes enclosed in a shell.

        • One fluid flows through the tubes, and the other flows outside the tubes within the shell.

        • Suitable for high-pressure and high-temperature applications.

      • Plate Heat Exchanger:

        • Uses thin, corrugated plates stacked together to create channels for fluid flow.

        • Compact design with high heat transfer efficiency.

        • Ideal for low to medium-pressure applications.

      • Plate and Frame Heat Exchanger:

        • A type of plate heat exchanger with a frame to hold the plates together.

        • Allows for easy cleaning and maintenance.

      • Plate-Fin Heat Exchanger:

        • Uses fins sandwiched between plates to increase surface area for heat transfer.

        • Common in aerospace and cryogenic applications.

      • Spiral Heat Exchanger:

        • Consists of two spiral channels wound around a central core.

        • Compact and efficient for handling viscous fluids or slurries.

      • Double Pipe (or Hairpin) Heat Exchanger:

        • Simplest design with one pipe inside another.

        • Suitable for small-scale applications or high-pressure scenarios.

          3. Based on Heat Transfer Mechanism

          • Direct Contact Heat Exchanger:

            • Fluids come into direct contact with each other.

            • Example: Cooling towers.

          • Indirect Contact Heat Exchanger:

            • Fluids are separated by a solid barrier (e.g., tubes or plates).

            • Example: Shell and tube, plate heat exchangers.

          • Regenerative Heat Exchanger:

            • Uses a heat storage medium to transfer heat between fluids.

            • Example: Rotary regenerators or fixed-matrix regenerators.

              4. Based on Application

              • Air Cooled Heat Exchanger:

                • Uses air as the cooling medium.

                • Common in power plants and refineries.

              • Liquid Cooled Heat Exchanger:

                • Uses liquid (e.g., water or oil) as the cooling medium.

              • Condensers:

                • Converts vapor into liquid by removing heat.

              • Evaporators:

                • Converts liquid into vapor by adding heat.

              • Boilers:

                • Generates steam by heating water.

                  5. Based on Phase Change

                  • Single-Phase Heat Exchanger:

                    • Both fluids remain in the same phase (liquid or gas) throughout the process.

                  • Two-Phase Heat Exchanger:

                    • Involves a phase change (e.g., condensation or evaporation) in one or both fluids.

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Siping Juyuan Hanyang Plate Heat Exchanger Co., Ltd , https://www.tj-heatexchange.com