Ventilation and heat dissipation design for cold storage room | Supporting civil engineering requirements for stable condensing pressure of compressors
The heat dissipation of the cold storage room directly determines the upper limit of the compressor operation. The ventilation rate standard for the air-cooled condensing unit room is 300m ³/h for each kilowatt of cooling capacity, ensuring heat dissipation.
The air inlet of the computer room is set at the lower part, and the air outlet is set at the upper part. The cold and hot air flow forms convection, and the air inlet cannot directly use the cold storage return air. The high humidity air inside the warehouse can easily cause condensation in the condenser.
The environment of the Xiteluoduo air-cooled compression condensing unit room has been controlled at ≤ 38 ℃ for a long time. When the room temperature exceeds 42 ℃, the condensing pressure rises rapidly, and the cooling capacity of the unit decays by more than 20%.
In tropical regions such as Southeast Asia and Africa, many project computer rooms are equipped with negative pressure exhaust fans. The fan air volume is configured at 1.2 times the total air exchange rate to cope with extreme high temperature weather in summer.
Multiple compressors are arranged side by side in the computer room, with a reserved distance of more than 1.2 meters between units. The condenser outlet cannot face the inlet of another unit to avoid short circuit circulation of hot air.
The cooling pressure in the water-cooled unit room is lower, but the water-cooled unit needs to pay attention to the placement of the cooling tower. The hot air reflux from the cooling tower will also raise the inlet water temperature, indirectly increasing the condensation pressure.
Many self built cold storage owners compress the area of their machine rooms, which are small and enclosed without ventilation. During high temperature periods during the day, the high-pressure protection frequently trips, mistakenly believing that the compressor selection is too small.
The electrical control cabinet and frequency converter in the computer room are far away from the hot air outlet of the condenser, and the hot air is directly blown into the electrical control box. The temperature rise of the circuit board exceeds the standard, and the probability of electrical failure increases by 2.5 times.
During the drawing review stage of foreign trade project computer rooms, the general contractor often neglects ventilation, and after the equipment arrives, the wall openings are renovated on site, which will increase the construction period and renovation costs.
Dust removal in the computer room is equally important. Dust in the air continues to adhere to the condenser fins. Cleaning the air-cooled condenser once a quarter, combined with good ventilation, significantly improves the stability of compressor operation.
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FAQ
What is the standard for air exchange rate per kilowatt of cooling capacity in air-cooled machine rooms? It is recommended to provide 300 cubic meters per hour of air volume per kilowatt of cooling capacity.
What is the recommended upper temperature limit for the computer room environment? The temperature control of the computer room for long-term operation shall not exceed 38 ℃.
How much space is reserved for parallel installation of units? At least 1.2 meters should be reserved between adjacent units.
What are the consequences of hot air short circuit circulation? The condensation pressure increases, the cooling capacity decreases, and the high pressure trips.
Why does the electrical control cabinet avoid the hot air from the condenser? High temperature hot air will increase the probability of electrical faults.
6. What is the amplification ratio of the exhaust fan volume in the tropical computer room? Increase the ventilation volume by 1.2 times to cope with high temperatures.
Can we directly extract air from the cold storage to ventilate the computer room? Not recommended, high humidity air is prone to condensation.
2026-11-09 17:37:25
