How to Ensure the Safety of Air Cooled Condensing Units?

The safety of air cooled condensing units can be ensured through several measures, including proper fan operation configuration, enhanced vacuum system management, optimized anti-freeze design, strengthened temperature monitoring, installation of windbreaks and isolation valves, and ensuring system airtightness. The specific details are as follows:

1. Properly Configure the Air Cooled Fan Unit's Operation:

When the ambient temperature is lower than the air cooled condenser's design temperature, adjust the fan speed to reduce the amount of cooling air entering the unit, preventing excessively low turbine back pressure and localized over-freezing of the condenser tube bundles. Simultaneously, use intermittent reverse rotation of the counter-current air cooled condenser's fan to suppress natural cooling of the internal tube bundle steam, or extract the hot air above the condenser to thaw the cooling tube bundles.

2. Enhance Vacuum System Management:

Select appropriately powered vacuum equipment to remove non-condensable gases, preventing their accumulation in the counter-current condenser tube bundles. Simultaneously, maintain the tightness of the vacuum system to prevent an imbalance between the amount of leaked air and the vacuum system's capacity, which could lead to the accumulation of non-condensable gases.

3. Optimized Anti-freeze Design:

An elliptical base tube and single-row tube design facilitates drainage within the tubes, reducing the possibility of condensate supercooling and freezing.

A counter-flow air cooler is installed to prevent condensate from supercooling and freezing at the bottom of the air cooler, while simultaneously allowing air and non-condensable gases to drain smoothly, avoiding dead zones and cracking of the finned tubes.

Heating tape and insulation are installed at the radiator lower header and in the counter-flow air extraction pipes. Insulation is also added to the condensate pipes to reduce condensate supercooling.

4. Enhanced Temperature Monitoring:

During winter operation, the temperature of the upper, middle, and lower parts of each radiator row is regularly measured locally to ensure that the temperature difference does not exceed the specified value, preventing localized supercooling.

Closely monitor the supercooling of each row of condensate. The maximum supercooling of condensate in winter should not exceed a certain value; otherwise, the vacuum pump should be started or the unit back pressure increased.

Check the condensate temperature of each row of the air cooled condenser. It should be controlled above a certain temperature, and the system supercooling should be kept within a reasonable range.

5. Install windbreaks and isolation valves:

Install windbreaks to prevent direct drafts from outside wind onto the radiators in winter, which could cause a significant temperature difference in the condensate on both sides.

Install valves on the steam distribution pipes to allow the air cooled condenser system to operate in sections, increasing the heat load and achieving antifreeze protection. Additionally, during winter unit startup, consider isolating some cooling unit rows to reduce cooling capacity.

6. Ensure system airtightness:

After installation, the air cooled system must undergo an overall airtightness test to ensure good airtightness. During unit commissioning, it is necessary to strengthen the proper monitoring of vacuum levels to determine whether there will be any gas leaks inside the air cooled unit.

Tianyicool is one of the excellent manufactures in commercial and industrial refrigeration field, building the its vision of being the first choice in refrigeration. For more information about air cooled condensing unit, please contact us.

Email: tianyicool@vip.163.com / info@tianyicool.cn

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