Application of air cooler

The air cooler is mainly used for the cooling processing and storage of meat, poultry, aquatic products, fruits and vegetables, eggs and milk, cold drink products in the food industry, as well as the cooling and refrigeration of beer, liquor and other alcoholic drinks and beverages. In addition, it can meet the cooling needs of processing raw materials and places in chemical, pharmaceutical, mechanical, electronic, hydropower and other industries.

coil

There are two kinds of coil materials of high efficiency air cooler: aluminum tube and steel plate. The expansion joint technology is adopted between the fin and the heat exchange tube of the aluminum tube and the aluminum sheet cooling fan, which has the advantages of close contact, small contact thermal resistance, high heat transfer efficiency and good anti-corrosion performance. The integral hot-dip galvanizing process is adopted for the fin and heat exchange tube of steel tube sheet air cooler. The contact between the tube pieces is closer, the contact thermal resistance is small, the heat transfer efficiency is high, and the anti-corrosion ability is strong. The fins are corrugated porous aluminum or steel. The fin combinations with fixed fin pitch (8, 10, 12mm) and variable fin pitch (8 / 16, 10 / 20, 12 / 24mm) can be used. The fin is a combination of deep extension sleeve and spacer, and the positioning is accurate.

The coil can be made after the air pressure test.

Fan

The special axial-flow fan is selected for the air cooler, which has the characteristics of high efficiency, low noise and long service life. The blade is made of die-casting aluminum alloy wing type forward swept twisted blade with high strength and clean surface. Service temperature - 40 ℃ ~ - 50 ℃.

Shell

There are four kinds of high quality steel plate spray painting or electrostatic painting, stainless steel plate and aluminum plate for the shell of high efficiency air cooler. Fan panel adopts unique design, strong rigidity, beautiful appearance, good corrosion resistance and long service life.

model selection

The nominal load in the product catalog refers to that there is no frost on the external surface of the air cooler, the refrigerant is ammonia (R717), the liquid is supplied by ammonia pump, the heat transfer temperature difference is DTM = 10 ℃, and the evaporation temperature is to = - 10 ℃.

Selection steps

Symbol description:

QN - Nominal cooling load (kw)

To - evaporation temperature (℃) DTM - difference between average inlet air temperature and evaporation temperature (℃) QNC - calculated cooling load (kw) f - correction coefficient (related to to to, DTM, liquid feeding mode and frosting thickness) f = F1 · F2 · f3f1: parameters related to to to and DTM (see Fig. 1) F2: parameters related to liquid supply mode, ammonia pump liquid supply F2 = 1.0, gravity liquid supply F2 = 0.94, F3: coefficient related to total frost thickness Calculation method of model selection: calculation chart of nominal cooling load for different to and DTM ammonia pumps

1. Determine the required Qo of air cooler;

2. Determine the design conditions to and DTM;

3. F was determined according to to to, DTM, frosting thickness and liquid supply mode;

4. According to QNC = Qo / F, f = F1 · F2 · F3;

5. Find the QN value from the parameter table and press QN? QNC;

6. Determine the specification and model of air cooler.