In the actual operation of the chiller system, there are often the following misoperations:-
(1) The water inlet valve of the condenser on the chiller that does not need to be opened is not turned off before starting the water to cause drowning. A part of the cooling back water flows away from the condenser of the startup group, which reduces the flow of cooling water in the condenser of the running unit, causing the condensing pressure to rise, the operating current of the main engine increases, the cooling capacity of the unit decreases, and the unit will be seriously Stopping the operation wastes electricity, reduces the cooling effect, and easily damages the equipment.
(2) Due to the previous misoperation, the condensing pressure of the main engine and the effluent temperature of the cooling water rise. Cause the operator to make a misjudgment, mistakenly believe that the cooling water is not enough to open the condenser inlet valve and the cooling water pump outlet valve, and some also increase the cooling tower fan, resulting in increased power consumption of the pump and cooling tower fan
(3) What's more, blindly add a cooling water pump. Although the addition of the cooling water pump can actually reduce the cooling water temperature and the condensing pressure, after all, the power of one pump is wasted, so it is wrong to add the wrong cooling water system. The correct operation method is:
(1) It is not necessary to operate the unit condenser inlet valve to close before starting the machine to prevent drowning.
(2) Open the inlet and outlet water valve on the condenser of the unit to be operated (general outlet valve is normally open, the inlet valve is opened and closed as needed. The condenser and evaporator are the same). Turn on the corresponding cooling water pump to adjust the condenser inlet and outlet. The pressure drops to about 68,6 kPa (0,7 kg/cm:) (the pressure drop is based on the principle of overcoming the resistance of the pipeline, and the lower the power saving effect is better).
(3) If the pointer of the condenser inlet and outlet water pressure swings too large, it means that there is air in the cooling water system, and the air needs to be exhausted. After the pressure gauge indicates normal, continue the next operation.
(4) In operation, no matter how many units are opened, it is a cooling water pump to one main unit (the matching is the same).
For a running chiller. Under ambient conditions, the load has become constant. At this time, the condensing heat load is also fixed. It is stipulated that the temperature difference between the inlet and outlet water is 5 °C, and the amount of cooling water must also be a certain value, and the flow rate is inversely proportional to the temperature difference between the inlet and outlet water. Therefore, the operation of the chiller. As long as the temperature difference between the inlet and outlet of the cooling water is specified, this flow rate is usually controlled by the pressure drop of the cooling water entering and leaving the condenser. Under standard operating conditions, the pressure drop of the condenser inlet and outlet water is set to 68.6 kPa (0, 7 kg/cm:).
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