Difference and Application of Co-current and Counter-current Types in Evaporative Condenser for Cold Storage

Release time:

Jan 16,2026

The key distinction between co-current and counter-current configurations in evaporative condensers for cold storage facilities lies in the relative flow direction of air and spray water, which directly determines heat transfer efficiency, structural dimensions, energy consumption, maintenance complexity, and applicable scenarios.

I. Core Working Principle

1. Upstream flow type

Flow direction: Air enters from the upper/side of the equipment, flows in the same direction as the downward spray water, and collectively passes over the condensing coil.
Refrigerant flow process: High-temperature gaseous refrigerant enters from the upper part of the coil and is cooled by the water film outside the tube, while liquid refrigerant flows out from the lower part.
Structural characteristics: Typically equipped with a packing layer, where air and water are pre-cooled in the packing zone before entering the coil section for secondary heat exchange.

2. Countercurrent type

Flow direction: Air enters from the lower part of the device and flows upward; spray water is discharged downward from the upper part, creating counter-current convection between the two.
Refrigerant flow path: Consistent with the co-current flow, the refrigerant enters from the top and exits from the bottom.
Structural characteristics: Generally without packing material, air directly exchanges heat and mass with the water film on the coil surface, resulting in more direct heat transfer.

II. Comparison of Key Performance and Parameters

Dimensional contrast	Concurrent flow	Countercurrent type
heat transfer efficiency	Intermediate (with secondary heat exchange, decreasing temperature difference driving force)	Higher (maintaining a larger temperature difference throughout the process ensures more complete evaporation)
condensing temperature	Relatively high	Lower (by 3–5°C) and more energy-efficient
floor space	Larger (more complex structure, requiring a packing area)	Smaller (compact structure, no filler)
Airflow/Air Resistance	Low air resistance and relatively uniform airflow distribution	Significant wind resistance requires higher wind pressure fans
Water/Power Consumption	Relatively high water and electricity consumption	More water and electricity-efficient (high evaporation efficiency)
Tendency to scaling	Lower (filler pre-cooling, small temperature gradient in the coil)	Higher (higher temperature in the upper coil section, prone to scaling and occurrence of "dry spots")
noise level	Lower (lower wind resistance, lower fan load)	Higher (higher fan pressure results in more noticeable noise)
Maintenance cost	Higher (requires cleaning of packing and coil)	Lower (only cleaning of coils, no packing)
Suitable climate	Wet and high-humidity areas (less prone to scaling)	Dry and low-humidity areas (with high evaporation potential)

III. Recommendations for Cold Storage Scenario Selection

Preferentially select countercurrent type: Cold storage facilities that prioritize high efficiency, energy conservation, space-saving, and are located in arid climates (e.g., northern or northwestern regions), with good water quality and low scaling risk.
Preferentially select the co-current flow type: cold storage facilities with humid and rainy climates, poor water quality, prone to scaling, or strict noise control requirements, and sufficient site space.