Cold storage condenser fouling determination and cleaning plan | Cleaning cycle for air-cooled fins and water-cooled scale
The condenser is responsible for the system's heat dissipation task. If the heat exchange surface is dirty, it will directly increase the condensation pressure, increase the power consumption of the compressor, decrease the cooling capacity, and frequently trip the high-pressure protection.
Air cooled finned condenser, regular fresh-keeping warehouse blows once every quarter; For aquatic processing and feed workshops with high dust, the inspection period will be shortened to 30 days and cleaned every 2 months.
The fins of the Xitelide air-cooled condensing unit are made of hydrophilic aluminum foil, cleaned with low-pressure clean water and neutral descaling agent, and the water pressure is controlled to be ≤ 0.4MPa to prevent the fins from collapsing and deforming.
After the fins are overturned, the airflow is short circuited, the heat transfer area is ineffective, and if the lodging exceeds 30%, the cleaning effect is poor. It is necessary to use a fin comb for correction and repair.
The faults of water-cooled condensers often come from scale. In areas with high hardness of cooling water, scale accumulates on the inner wall of copper pipes, and the heat transfer resistance increases exponentially. It is recommended to chemically remove the scale once a year.
Many users wait until the high pressure frequently trips before cleaning the condenser. Long term high pressure operation results in the compressor exhaust temperature continuously exceeding the standard, and the aging rate of valve plates and refrigeration oil accelerates.
Cleaning the condenser should be avoided during the operation period of the unit, and the operation should be carried out after shutting down and releasing pressure; It is strictly prohibited to direct high-pressure water guns towards the electrical control box and fan motor to prevent water ingress, short circuit, and burning of electrical components.
For foreign trade projects in coastal salt spray areas, the anti-corrosion level of the condenser needs to be upgraded by using anti-corrosion coated fins and increasing the cleaning frequency by one level. The corrosiveness of salt scale is much greater than that of ordinary dust.
Parallel connection of multiple condensing fans, failure to replace a single fan in a timely manner, loss of local air volume, uneven heat transfer in the condenser, random triggering of high-pressure protection, and high difficulty in troubleshooting.
The pressure difference between the inlet and outlet of the condenser can be used as an indicator for determining fouling. If the pressure difference increases by more than 0.05kPa compared to a new machine, it indicates severe dust accumulation and requires cleaning and maintenance arrangements.
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FAQ
What is the recommended cleaning cycle for ordinary air-cooled cold storage? Regular working conditions require quarterly blowing and cleaning.
2. What is the upper limit of water pressure for cleaning the air-cooled condenser? The water pressure should not exceed 0.4MPa.
How to deal with severe lodging of fins? Using a fin comb for correction, excessive lodging significantly reduces heat transfer.
How often is the scale on the water-cooled condenser cleaned? It is recommended to perform chemical descaling annually in areas with relatively hard water quality.
5. What should be noted for condenser in coastal salt spray environment? Choose anti-corrosion fins to increase cleaning frequency.
How much does the pressure difference of the condenser increase to determine whether it is dirty or blocked? If the pressure difference increases by 0.05kPa compared to the new machine, it needs to be cleaned.
Can the unit be operated during cleaning? It is necessary to stop the machine and release pressure before cleaning the operation.
