Troubleshooting the problem of excessive pressure of the water-cooled unit in the HVAC system
High pressure in a water-cooled unit can be caused by a variety of reasons, here are some possible causes and solutions:
Insufficient cooling water flow: Check whether the cooling water** is sufficient, make sure the water pump and water supply pipeline are working properly, and increase the cooling water flow to reduce the pressure of the condenser. Insufficient cooling water flow can lead to degraded water-cooled unit performance, increased pressure, and possibly even system failure. To solve the problem of insufficient cooling water flow, the following measures can be taken: check the water pump, water pipes, valves, cooling water source, clean the cooler, water cooling unit settings, and improve the cooling water flow.
Cooling water temperature is too high: The water temperature is high and the heat dissipation is poor, resulting in a high condensation temperature, and the condensation pressure (or exhaust pressure) will definitely be too high. High water temperatures can be caused by cooling tower failures such as loose fan belts, jamming or reversing, and faulty water distributors, which can cause the cooling water to be very hot and rise rapidly and continuouslyThe outside temperature is high, the cooling water cooling channel is short, and the amount of water that can be circulated is small. The following measures can be taken: inspect and repair the cooling tower fan and water distributor;Extend the cooling water cooling channel and increase the water storage tank.
Condenser fouling: Condenser fouling in water-cooled units can lead to reduced condenser heat dissipation efficiency. Condenser fouling is the accumulation of scale or dirt on the surface of the condenser, which leads to a decrease in the efficiency of heat exchange between the cooling water and the condenser. This phenomenon can affect the refrigeration performance and efficiency of the water-cooled unit, resulting in an increase in the pressure of the condenser, increasing the energy consumption of the water-cooled unit, and potentially causing unstable system operation.
Excessive refrigerant charge: Ensure the range of refrigerant charge, too much refrigerant increases the load of the compressor and the compressor current is large. Too much refrigerant will affect its own heat dissipation effect, and the condensation temperature and pressure will increase accordingly. When too much refrigerant prevents the liquid in the evaporator from evaporating completely, the liquid refrigerant is sucked back into the compressor, causing a "liquid shock" phenomenon, and too much refrigerant can cause the pressure to rise.
Evaporator Problems: Check the evaporator for blockage or dirt, clean or replace the evaporator to improve the heat transfer efficiency. The evaporator is a component used to absorb heat in a water-cooled unit, which exchanges heat with cooling water or air through the refrigerant, so that the refrigerant changes from a liquid state to a vapor state. If the evaporator surface is clogged or dirty, it will affect the heat exchange between the cooling water or air and the refrigerant, resulting in a decrease in heat transfer efficiency, which in turn will affect the performance of the entire refrigeration system.
Compressor Problems: Compressor failure or abnormal operation can also lead to excessive pressure, and the working condition of the compressor needs to be checked.
Compressor leakage: Leakage can lead to the loss of refrigerant and an increase in pressure inside the compressor, resulting in excessive pressure.
Compressor valve failure: Valve failure may cause the compressor to fail to start or stop properly, resulting in abnormal pressure.
Compressor internal wear: Worn pistons, piston rings, or cylinder walls can cause compressor performance to deteriorate, increasing compression power and pressure.
Compressor lubrication issues: Insufficient or contaminated lubricating oil can cause unstable compressor operation, increased friction and wear, resulting in excessive pressure.
Compressor electrical fault: An electrical fault may cause the compressor to fail to start or stop, or to run abnormally, resulting in abnormal pressure.
Overload Operation: Exceeding the rated operating load of the compressor may result in excessive pressure, and it should be ensured that the compressor operates within the design parameters.
7.High ambient temperature: High ambient temperature can cause the cooling efficiency of the water-cooled unit to decrease, which will increase the pressure. This is due to the fact that high ambient temperatures can increase the operating pressure of the condenser, resulting in the condensation process of the refrigerant in the condenser being hindered, thus affecting the performance of the refrigeration system.