Jun 23, 2017
Upright Chiller Environmental conditions
For a running chiller, the ambient conditions and the load have become constant. The condensing heat load is also set. The provisions of the inlet and outlet temperature difference of 5 ℃, the cooling water must also be a certain value and the flow rate is inversely proportional to the temperature difference between inlet and outlet. Therefore, the operation of the chiller as long as the provisions of the cooling water out of the water temperature difference on the line of this flow is usually used, out of the condenser cooling water pressure to control. Under standard operating conditions, the condenser inlet and outlet water pressure drop is set to 68.6 kPa (0,7 kg / cm).
In the actual operation of the cooling water system, there are often the following misuse:
⑴ before the boot does not need to open the unit on the condenser of the inlet valve closed channeling water. Part of the cooling backwater never flow in the condenser, reducing the running of the unit cooling water flow within the condenser, resulting in increased condensing pressure. The host running current increases. Unit cooling capacity decline, serious also makes the unit Stop running, waste electricity, but also reduce the cooling effect, but also easy to damage the equipment.
⑵ due to a misuse, the host of the condensing pressure and cooling water outlet temperature. To the operator to cause misjudgment.It is mistaken for cooling water is not enough to open a large condenser inlet valve and cooling water pump valve, and some also increase the cooling tower fan, resulting in water pump, cooling tower fan power consumption increased
⑶ more even, blindly to open a cooling water pump. Although the addition of cooling water pump can reduce the cooling water temperature and condensation pressure, but after all, a pump running power wasted, and therefore is wrong on the wrong cooling water system correct method of operation is:
⑴ before the start will not need to run the unit condenser inlet valve closed to prevent channeling water.
(2) Open the inlet and outlet valves on the condenser of the unit (normally open the water valve normally, the inlet valve is opened as needed, the condenser, the evaporator is the same) to open the corresponding cooling water pump. Adjust the condenser inlet and outlet pressure drop To about 68.6kPa (0.7 kg / cm :) (pressure drop to overcome the resistance of the pipeline for the principle of lower energy saving better).
⑶ If the condenser out of the water pressure gauge pointer swing is too large, indicating that the cooling water system with air. To be exhausted to the pressure gauge to normal after the next step.
⑷ operation, whether to open a few units, are a cooling pump on a host (match to the same).
Important indicators should be considered when looking for industrial chillers, including the entire life cycle cost, power supply, cooling IP rating, chiller cooling capacity, evaporation, evaporation material, evaporator, condenser material, capacitor capacity, ambient temperature, fan motor type , Noise level, internal pipe material, compressor number, type of compressor, circuit refrigerator, coolant requirements, fluid exhaust temperature. For large and medium-sized units should range from 3.5-7.0 high value of the meaning of higher efficiency. Chiller efficiency is often specified per kilowatt of cooling tons (kilowatt / round trip).