High pressure in air conditioning water-cooled units is 90% of the time due to these five reasons!
Air conditioning water-cooled units in use if the pressure is too high, the compressor has a fatal impact on the compressor or even compressor burnout, resulting in high pressure for many reasons, this article on the common reasons and the corresponding treatment methods for a brief discussion.
(A) the cooling water flow is too low, can not reach the rated value of the system
Cooling water flow is not enough of the main performance: in and out of the water pressure difference becomes small, the temperature difference becomes large. Insufficient cooling water flow, in the condenser refrigerant and cooling water heat exchange is not sufficient, the refrigerant heat can not be taken away, resulting from the compressor out of the high-temperature and high-pressure gas can not be liquefied into a low-temperature and high-pressure liquid, the compressor to the condenser pipeline pressure is too high, easy to cause the pressure switch action, the system shutdown protection.
There are many reasons for insufficient cooling water flow, common cooling water system water shortage, cooling system mixed with a large amount of air, cooling pump flow is too small and the system does not match. Usually used to deal with: increase the amount of cooling water system; in the pipeline high position to install exhaust valves, exhaust gas; replace the cooling pump to match the system.
(B) cooling water temperature is too high
For chiller cooling water rated condition is usually 30 ~ 35 ℃, high water temperature, poor heat dissipation, will inevitably lead to high condensing temperature, condensing pressure (or exhaust pressure) will certainly be too high, this phenomenon occurs mostly in the high temperature summer. Causes of high water temperature may be: cooling tower failure, such as loose fan belt, card block or reverse, water distribution failure, this situation will lead to high cooling water temperature, and rapid and sustained increase; high outside air temperature, cooling water cooling water circuit is short, can be recycled less water, this situation cooling water temperature will generally be maintained at a high level.
Usually deal with the above problems the main method is: cooling tower fan, water distribution for inspection, repair; extend the cooling water cooling waterway, increase the storage tank.
(C) condenser fouling, blockage, poor heat transfer effect
Cooling water is usually tap water, at a temperature of more than 30 ℃ is easy to scale, coupled with the cooling tower for the open, directly exposed to the air, foreign objects and dust is very easy to enter the cooling water system, the condenser caused by the obstruction, reducing the heat exchange area, affecting the efficiency of heat transfer, resulting in condensing pressure is too high.
The simplest and most direct way to deal with this problem is to clean the condenser on a regular basis. According to the scaling and blocking situation can choose physical descaling cleaning and chemical cleaning.
Physical descaling method: mechanical descaling is the use of flexible shaft tube washer on the steel cooling tube condenser descaling method, especially for vertical shell and tube condenser.
Chemical pickling descaling method: with the preparation of weak acidic descaling agent on the condenser cleaning, so that the scale off, improve the heat transfer efficiency of the condenser.
(D) the system mixed with non-condensable gases
Non-condensable gases in the system mainly refers to the invasion of air through various ways. Although these non-condensable gases circulate in the system together with the refrigerant, it cannot be liquefied under the working pressure and temperature conditions of the unit and finally remains in the condenser. Excessive non-condensable gases in the unit can cause deterioration in the heat transfer performance of the condenser and evaporator, and excessive condensing pressures and exhaust temperatures.
Discharge of non-condensable gases can be released directly to the atmosphere through the condenser or the top of the liquid storage device bleeder valve, in the bleeder will inevitably lose some refrigerant.
(E) Refrigerant excess
Refrigerant in the air conditioning system in the volume ratio is a certain requirement, too much refrigerant so that the compressor load increases, the compressor current. Too much refrigerant affects its own cooling effect, condensing temperature and pressure will rise. When too much refrigerant leads to evaporator liquid can not be completely evaporated, liquid refrigerant will be sucked back to the compressor, resulting in "liquid shock" phenomenon, serious damage to the valve, and even burned the motor. Therefore, the amount of refrigerant in the system must not be too much.
The way to deal with too much refrigerant is to recover or discharge part of the refrigerant until the refrigerant quantity is adjusted to the best effect of the system.
Xinxiang Yukun Refrigeration Technology Co. is a production and sales of refrigeration two apparatus parts and sheet metal products, mainly engaged in condenser, evaporator, heat exchanger, reservoir, filter drier, fin evaporator (condenser), stamping parts, sheet metal parts, aluminum tubes for refrigeration, etc.
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They are air cooled heat exchangers for refrigeration system. They are divided in 4 group:CD,CDC,CDS and CDV.All the products have been tested on 2.8MPa air leakage,and the system is disposed of pollution,applicable to R22,R134a,R404A,R407C systems.
Our company mainly produces products for:Fin Evaporator.Fin Type Condenser.Capillary Tube.Aluminum Coolant Reservoir.Plate Reinforcement Parts.Stamped Parts.Aluminum Tube.Instrument Testing Equipment.
Supermarket Refrigeration Show Case Copper Condenser Coil
1. OEM or ODM can be accepted
2. Fin type: Louver or corrugated
3. Be customerized according to samples and drawings.
4. High quility and low price and energy saving 60% (CE, RoHS, EMC and ISO9001 certification) The CD series products can be used in Various specificantion Condensing Units .
