How should the chiller operate correctly
For a running chiller. Environmental conditions, the load has become a fixed value at this time, condensing heat load is also fixed value. Provisions of the inlet and outlet temperature difference of 5 degrees, cooling water is also necessarily a certain value and the flow rate is inversely proportional to the water temperature difference between inlet and outlet. Therefore, the chiller operation. As long as the provisions of the cooling water inlet and outlet water temperature difference on the line of this flow is usually used to enter, out of the condenser cooling water pressure drop to control. Under the standard condition, the condenser inlet and outlet water pressure is 68.6kPa. (0, 7kg/cm).
In the actual operation of the cooling water system, there are several misoperation:
The water inlet valve 1, cold water machine boot before will not need to open the closed unit condenser caused by channeling water. A part of the condenser cooling water never flowed away, reducing the running flow of cooling water in condenser, causing condensation pressure, the host running current increases, the cooling capacity decreased, serious will also cause the unit to stop running, not only a waste of electricity, but also reduce the cooling effect, but also easy to damage the equipment.
2, due to a mistake, cold water machine condensing pressure and cooling water outlet temperature. Give the operator mistake to judge, mistaken for the cooling water is not enough to open the inlet valve and the condenser cooling water pump outlet valve, some additional cooling tower fan, pump, cooling tower fan power consumption increase
3, what is more, blindly to open a cooling water pump. Although the open cooling water pump can reduce the temperature of cooling water and condensing pressure, but after all, a pump power wasted. So it is wrong.
The correct method of operation cooling water system:
1, before starting the operation of the unit will not need to shut down the condenser inlet valve, prevent water channeling.
2, will open the water inlet and outlet valve operation on the condenser (usually water outlet valve open inlet valve according to the need of opening and closing. The condenser and the evaporator are the same) to open the corresponding adjustment of the condenser cooling water pump, inlet and outlet pressure below 68.6kPa (0.7kg/cm) about (pressure drop to overcome the pipeline resistance principle, better low power saving effect).
3, if the water condenser pressure gauge pointer swing is too large, that the air cooling water system, need to exhaust the air pressure gauge instructions to continue normal operation the next step.
4, operation, whether to open a few water chillers, are a cooling water pump on a host (to match).