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Cool about 3.5 tons of milk per hour (inhomogeneity) from 37 degrees to 3 degrees.Milk cooled from 37 degrees to 25 degrees by 20 degrees well water for pre-cooling, then cooled down to 3 degrees by chilled water from chiller,
1. pre cooling capacity calculation
C (4.2) * M (3500) * T (37-25)/t (3600) * S (1.3) =P 1(63.7KW)
The well water flow needed: 63.7 x 0.86 / (37-25) * 1.3 = 5.9m3/h.
There must be no less than 5.9m3/h, less than 20 degrees well water to do pre-cooling to ensure the first step to pre-cool milk.
2. second cooling capacity calculation:
C (4.2) * M (3500) * T (25-3), t (3600) * S (1.3) =P 2(117KW)
3. The cooling capacity of the 2nd milk cooling system is 117kw/h, using AYD-70WS water-cooled milk chiller unit, under the evaporatiing temperature is -5 degrees, the propylene glycol temperature is 0 degrees and the condensing temperature is +38degrees, the cooling capacity is 140kw/h.
4. the milk chiller unit designed for 2 independent systems;
5. pre-cooling hot water for the cows to drink and heat recovery of spplying water, known pre cooling recovery of hot water is 5.9m3/h, pre cooling heat recovery:
4.2 x 3500 x (37-25 / 3600=49KW
49 x 0.86 / 5.9=7 +20 DEG =27 degrees
According to this calculation, the pre cooling heat recovery is 49KW, the recovery of hot water is about 5.9m3/h, the water temperature is about 27 degrees celsius.
6,.the pre cooling water as a supplementary water (about 27 degrees Celsius), and then through the heat recovery unit
Hot water can be recovered about 45 degrees Celsius for boiler and cleaning use.
According to unit waste heat recovery 30% calculation, 117 * 0.3=35KW.
35 x 0.86 / (45-27) =1.67m3/h/H, there will be about 1.67m3/h and 45 degrees hot water for boiler cleaning and use.
Item |
Water Cooled Milk Chiller Specifications |
|
Cooling Capacity |
Model |
AYD-140WS |
kw/h |
140 |
|
Power Input |
kw |
54 |
Outlet Temp |
degree |
0-2 |
Power Supply |
380V-3N-50HZ |
|
Refrigerant |
R404A |
|
Dimension(L*W*H) |
mm |
2700*1400*1500 |
Compressor |
Type |
semi-hermetic screw |
Power(kw) |
54 |
|
Condenser |
Type |
Shell and Tubes |
Pipe Size(DN) |