Once you want to choose a suitable Dongguan water chiller product for your company in production, you must first have an understanding of Dongguan water chillers:
Dongguan water chillers are commonly known as water chillers, including refrigerators, refrigerators, ice coolers, water freezers, and chillers. They are widely used in various industries, so their names are also different. The principle of its nature is a multifunctional machine that removes liquid vapor through a compression or heat absorption refrigeration cycle. The steam compression chiller consists of four main components: a steam compression refrigeration cycle compressor, an evaporator, a condenser, and some metering devices to achieve different refrigerants.
Dongguan water chillers can generally be divided into water cooled and air cooled according to their refrigeration forms. Technically, the energy efficiency ratio of water cooled chillers is 300-500 kcal/h higher than that of air cooled chillers; In terms of price, water cooling is much lower than air cooling; In installation, water cooling needs to be equipped with a cooling tower before it can be used, while air cooling is movable and requires no other assistance. However, air cooled chillers rely solely on fans to dissipate heat, which has environmental requirements.
After a brief understanding of the above 2 points, we can choose the appropriate Dongguan water chiller for the company's equipment!
In production, based on the company's on-site conditions, we first determine whether to choose water cooled or air cooled, and then calculate:
1. Calculate the heat value through the temperature difference between the inlet and outlet of cooling water (oil)
Q = SH * De * F * DT / 60
Calorific value=specific heat * specific gravity * flow rate * temperature difference
KW=(4.2/1.97  KJ/Kg*C ) *( 1/0.88KG/L ) *(L/min)
Q: Calorific value KW SH: Specific heat of hot water is 4.2KJ/Kg * C (4.2 kJ/kg * Celsius) Specific heat of oil is 1.97KJ/Kg * C (1.97 kJ/kg * Celsius)
De: Specific gravity of water 1 Kg/L (1 kg/L) Specific gravity of oil 0.88 Kg/L (0.88 kg/L) F: Flow LPM (L/min L/min)
DT: Temperature difference between inlet and outlet of cooling water (oil) (outlet temperature - inlet temperature)
Note: It is used to change the flow rate from liter/minute to liter/second; 1kW = 1kJ/s
Example 1: The inlet temperature of cooling water is 20 degrees, the outlet temperature is 25 degrees, and the flow rate is 10 liters/minute
Calorific value Q=4.2 * 1 * 10 * (25-20)/60=3.5KW
When selecting the cooling capacity of the chiller, it can be appropriately increased by 20% - 50%. Based on the calculated results, please select a reasonable chiller model in our parameter table, such as DHT-015A/DHT-015W
2. Estimated by the power and calorific value of the equipment
If used for spindle cooling, the cooling capacity of the refrigeration unit required can be estimated based on 30% of the spindle motor power.
For example, a 7.5KW motor can be equipped with a refrigeration unit with a cooling capacity of 2.2kw or 2.8kw;
The injection molding machine can be estimated based on 0.6KW cooling capacity per ampere
Supplementary notes:
1. The cooling capacity of a water chiller varies with ambient temperature and outlet water temperature
2. The actual heat output of the equipment may also change due to different workpieces, molds, parameters, etc
3. After using the chiller, the temperature drops, and the surface temperature of the connecting pipes, water tanks, oil tanks, molds, spindles, and equipment will be lower than the ambient temperature, resulting in heat absorption and increased load
4. In many practical applications of industrial cooling, the above methods cannot be accurately used for calculation. At this time, only empirical data, analogies of similar equipment, and other methods can be used for estimation.
5. Any calculation method may have deviations, resulting in the actual use of too large or too few refrigeration units, so the above method is only for reference!