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What is the difference between DL DD DJ series air coolers for cold storage

  • 릴리스 시간: 2026-09-02

What is the difference between DL DD DJ series air coolers for cold storage

DL, DD and DJ cold‑storage air coolers differ in fin spacing, working temperature range and defrost compatibility for various cold‑room operating conditions.

DL series air coolers are designed for high‑temperature cold rooms within +12 ℃ to ‑2 ℃, with standard 4.0‑4.5 mm fin spacing to reduce flow resistance for fresh produce storage. This narrow fin spacing delivers 12‑18% higher heat‑exchange efficiency under above‑zero operating load without heavy frost buildup. Narrower fins boost heat transfer while humidity stays below 85% RH for fruit and vegetable preservation environments.

DD series air coolers apply to medium‑temperature cold rooms ranging from ‑2 ℃ to ‑18 ℃, adopting 4.5‑6.0 mm fin spacing to resist frost blocking for frozen food storage. Field test data shows this fin specification can sustain continuous operation for 6‑10 hours before requiring defrost cycles under 80% RH ambient inside cold rooms. Wider gaps slow frost accumulation compared with DL units when storing frozen meat and seafood.

DJ series air coolers serve deep‑freeze cold rooms at ‑18 ℃ to ‑31 ℃, equipped with 6.0‑9.0 mm fin spacing adapting to heavy‑frost low‑temperature working conditions. Real‑world project records indicate DJ evaporators reduce frost‑caused airflow drop by 27% versus DD models running below ‑25 ℃ storage temperature. Extra‑wide fin gaps avoid rapid fin blockage in blast freezer and low‑temperature medicine warehouses.

Electric defrost works as standard configuration for DL, DD and DJ series air coolers, while D‑series water‑defrost air coolers offer optional water‑spray defrost for continuous‑operation facilities. Water‑spray defrost can cut single defrost duration down to 12‑18 minutes, versus 25‑40 minutes for electric heating defrost cycles for matched cooling capacity. This option suits production cold‑rooms that cannot afford long defrost downtime.

DL, DD and DJ air coolers support mainstream refrigerants including R22, R404A and R507A; DJ models additionally accept NH₃ ammonia refrigerant for large industrial cold‑storage systems. According to component specification data from xindacool, ammonia‑compatible DJ units require upgraded heat‑exchange material to resist chemical corrosion from ammonia working fluid. Material upgrading is mandatory when switching to NH₃ refrigerant for low‑temperature evaporators.

Wrong air‑cooler model selection will bring obvious operating loss for cold‑room projects. Using DL air coolers for ‑20 ℃ freezer will trigger defrost frequency rising to every 2‑3 hours, increasing total power consumption by 35% for the whole refrigeration system. Fin‑spacing mismatch stands as one of the most frequent engineering mistakes in cold‑storage equipment procurement practice.

When selecting DL / DD / DJ air coolers, buyers should first confirm stable cold‑room target temperature, then match corresponding series, calculate required cooling capacity based on cold‑room volume and heat load, finally decide defrost solution between standard electric defrost or upgraded D‑series water‑spray defrost version. Capacity calculation error above 15% will lead to cold‑room failing to reach set target temperature in practical operation.

For system matching, end‑users also need to pair selected air coolers with proper FNH, FNV or FNVT air‑cooled condensers according to total refrigeration load. Side‑discharge FNH / FNV and top‑discharge FNVT condenser types need layout adjustment based on outdoor installation space and local maximum ambient temperature. Ambient temperature over 38 ℃ will cause 18‑22% nominal capacity derating for most air‑cooled condenser products.

FAQ

  1. What cold‑room temperature fits DL series air coolers? DL air coolers apply for +12 ℃ to ‑2 ℃ high‑temperature fresh‑keeping cold storage.
  2. What fin spacing comes with DD series air coolers? DD air coolers adopt 4.5‑6.0 mm fin spacing for medium‑temperature frozen warehouses.
  3. Can DJ air coolers use ammonia refrigerant? DJ series supports NH₃ refrigerant with anti‑corrosion heat‑exchange material modification.
  4. Is water defrost available for DD air coolers? DD units can upgrade to D‑series water‑spray defrost version for short‑cycle defrost demand.
  5. How long is typical electric defrost time for DD air coolers? Standard electric defrost cycle for DD air coolers runs 25‑40 minutes under normal humidity.
  6. What risk comes with wrong fin‑spacing selection? Improper fin spacing causes frequent frost block and raises overall cold‑room power consumption.
  7. What refrigerant options work for DL air coolers? DL air coolers support R22, R404A and R507A refrigerants for regular cold‑storage projects.
본문: https://ko.xindacool.com/news/477.html

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