Is it better to reduce the condensing pressure in the refrigeration system as low as possible?

Not lower is better, there is an optimal pressure range.

From the compressor performance curve, when the air conditioning system.

When the condensing pressure decreases, the theoretical capacity of the compressor will increase, that is, for the compressor alone, the lower the condensing pressure, the greater the compressor capacity.

For the whole refrigeration system, it is necessary to have a certain condensation pressure to obtain a more suitable evaporation pressure by throttling and depressurization, if the condensation pressure is too low, it will lead to the refrigerant in the refrigeration system pipeline.

The flow rate is insufficient, and the refrigerant flow rate decreases due to the small high and low pressure difference, and the oil return condition of the compressor in the refrigeration system will also deteriorate. Generally, for a certain type of refrigeration system, there is an optimal value of condensation pressure and evaporation pressure, and the working state of the refrigeration system will only deteriorate if it deviates from the optimal value.

No, this pressure is too low, if it is a screw machine, it is too low and the oil return effect is not good.

In addition, his pressure will not be too low, because the temperature of the circulating water is determined, unless the temperature of the circulating water is very low in winter, then the temperature of the circulating water must be heated before starting. It's okay to have a decent high point.

When the pressure is too high, it is due to the high temperature of the circulating water, so the fan is turned on to cool down, and the water temperature drops down after a while, and the pressure also drops, so the fan automatically shuts down again. Normally, if it's winter, the fan is basically not used.

In the normal operation of the piston compressor, the temperature is too low in winter, if the cooling fan of the evaporative condenser is started, the exhaust temperature will not rise, and may fall, which is affected by the condensing temperature. If you don't adjust it again, the exhaust temperature will continue to drop, the oil temperature will drop, and the body will cool until the frost is poured. If the condensing temperature is too low, the condensing pressure will drop, affecting the exhaust temperature, and even frosting.

Therefore, it is best not to rush to turn on the cooling fan in winter, and wait for the exhaust temperature to rise to 80 degrees, and then turn on a cold air cooler.

The impression of external factors is not that you want to come down.

The refrigeration capacity will increase when the condensing pressure is low, and efforts are made to reduce the condensing pressure during normal design and use.

Summary. The relationship between evaporation temperature and evaporation pressure 1, evaporation temperature and evaporation pressure The evaporation temperature is the temperature at which the liquid refrigerant boils. The actual use of the refrigeration system, due to different uses, the evaporation temperature is different, but the evaporation temperature of the refrigerant must be lower than the minimum temperature required by the cooled material, so that there is a certain temperature difference between the refrigerant and the cooled material in the evaporator, so as to ensure the driving force required for heat transfer.

In this way, when the refrigerant evaporates, it can absorb heat from the cold material and achieve low-temperature heat transfer. The pressure corresponding to the evaporation temperature is the evaporation pressure.

Hello, we are happy to answer for you: The condensing pressure will be reduced and the evaporation pressure will not change, and the refrigeration capacity will be reduced.

Evaporation pressure and condensation pressure have a great influence on the refrigeration system: the condensation pressure remains unchanged, the evaporation pressure rises, and the system COP rises; The steaming pressure remains unchanged, the condensation pressure decreases, and the system COP increases.

The relationship between evaporation temperature and evaporation pressure 1, evaporation temperature and evaporation pressure The evaporation temperature is the temperature at which the liquid refrigerant boils. The actual use of the refrigeration system, due to different uses, the evaporation temperature is different, but the evaporation temperature of the refrigerant must be lower than the minimum temperature required by the cooled material, so that there is a certain temperature difference between the refrigerant in the evaporator and the cold material Xiaosen material, so as to ensure the driving force required for heat transfer. In this way, when the refrigerant is evaporated, it can absorb heat from the cold material, and the physical object can be transported to low temperature heat transfer.

The pressure corresponding to the evaporation temperature is the evaporation pressure.

2. The relationship between evaporation temperature and evaporation pressure The lower the evaporation pressure, the lower the evaporation temperature, if the evaporation temperature of the system is continuously reduced, the refrigeration capacity of the refrigeration compressor will continue to decrease, and the refrigeration speed is not necessarily faster, and the lower the evaporation temperature, the lower the refrigeration coefficient of the tank travel system, and the load of the system is still increasing, so that the energy consumption of the system caused by the grinding ruler continues to increase, especially the low temperature system.

Answer. What is it?

The condensing pressure remains unchanged, and the refrigeration capacity will decrease when the evaporation pressure is increased.

Whether the cooling capacity decreases or does not change.

The condensing pressure is reduced.

The evaporation pressure is constant.

Dear, okay. The cooling capacity is reduced.

The evaporation temperature is the temperature at which the liquid refrigerant boils. The actual use of the refrigeration system, due to the different uses, the evaporation temperature is different, but the evaporation temperature of the refrigerant must be lower than the minimum temperature required by the cooled material, so that there is a certain temperature difference between the refrigerant and the cooled material in the evaporator, so as to ensure the driving force required for heat transfer. In this way, when the refrigerant evaporates, it can absorb heat from the cold material and achieve low-temperature heat transfer.

The evaporation temperature corresponds to the evaporation pressure.

When the condensing pressure decreases and the evaporation pressure remains the same, the refrigeration capacity will increase. This is because according to the actual thermal efficiency principle of the refrigeration cycle, the cooling capacity is proportional to the difference between the evaporation temperature, which in turn is directly related to the evaporation pressure return to the cleaning force. Therefore, the cooling capacity will increase as the condensation pressure decreases, which also means that the efficiency of the refrigeration cycle before the leakage is improved, resulting in better cooling results.

1) The condenser is too small. Replace or add a condenser.

2) The number of condensers put into operation is small. Increase the number of units in operation.

3) Insufficient cooling water flow. Increase the number of pumps in operation and increase the flow of water.

4) The cooling water temperature is too high. replenishment of low-temperature water (tap water or well water); use of defrosting water; To ensure the cooling effect of the cooling tower, the cooling tower is installed outdoors, due to the effect of the fan, there will be a large amount of dust, leaves, insects, etc. into the tower, which will cause the blockage of the cooling tower packing and pipes for a long time. When the water temperature is close to the humid bulb temperature of the air, the cooling tower fan should be turned off to reduce power consumption.

5) The heat exchange area of the condenser is reduced. Sufficient heat exchange area is an important guarantee for the heat exchange effect of the condenser. In particular, the refrigeration system of compression condensing unit is adopted, because the condenser of this unit has the function of liquid reservoir, when the liquid level in the condenser is too high, the condensation effect of the condenser is seriously affected, the condensation temperature and pressure increase, and the power consumption of the refrigeration compressor increases, therefore, the liquid level change should be paid attention to during operation, the condensate liquid in the condenser should be discharged in time, and the amount of refrigerant added should be strictly controlled to ensure that the condenser has sufficient heat exchange area.

6) The condenser is unevenly distributed. When the water distribution is uneven, the water flow in some pipes is the largest, and the water flow in some pipes is small, which will reduce the heat transfer efficiency and increase the condensation temperature. Good water flow distribution should be the water flow along the pipe wall rotation flow, if the water flow from the middle of the pipe, most of the water flow can not condense the effect.

Therefore, when the water distribution of the water distributor is uneven, the distributor should be replaced.

7) There is limescale on the condenser pipe. The scale on the condenser pipe leads to an increase in thermal resistance, a decrease in the heat transfer coefficient, and a decrease in the heat exchange effect, which increases the condensing temperature. Improve water quality and descale in time.

8) There is air in the condenser. The air in the condenser increases the partial pressure in the system, the total pressure increases, and the air will also form a gas layer on the surface of the condenser, resulting in additional thermal resistance, which reduces the heat transfer efficiency, resulting in an increase in condensing pressure and condensing temperature. The air should be released in time.

Summary. 2.The superheat becomes smallSuperheat refers to the temperature difference between the refrigerant before it flows to the evaporator, and the greater the superheat, the better the refrigeration performance. When the condensing pressure decreases, the refrigerant pressure and temperature in the condenser decrease, so the superheat decreases and the cooling capacity decreases accordingly.

Why refrigeration compressor, with the decrease of condensation pressure, the refrigeration capacity first increases and then decreases.

The reasons for how to judge the quality of each IGBT tube without decomposing the IGBT module are as follows:

1.The temperature difference in the condenser becomes smallerWhen the condensing pressure decreases, the temperature of the pre-bright refrigerant in the condenser decreases, resulting in a decrease in the temperature difference with the surrounding environment. In this way, less heat can be dissipated per unit time, and the cooling capacity will be reduced.

2.The superheat becomes smallSuperheat refers to the temperature difference before the refrigerant flows to the evaporator, and the greater the superheat, the better the refrigeration performance. When the condensing pressure decreases, the refrigerant pressure and temperature in the condenser decrease, the lead is reduced by superheat, and the refrigeration capacity is also reduced accordingly.

3.As the condensing pressure decreases, the compressor discharge temperature also decreases, resulting in a decrease in the power consumption of the compressor. However, when the condensing pressure continues to decrease, it will exceed the design bar of the compressor, resulting in the overheating failure of the compressor, and then reducing the cooling capacity of the ruler.

In summary, as the condensation pressure decreases, the refrigeration capacity will first increase, and then gradually decrease after reaching the maximum value of the number of shirts to a certain extent. This process is related to the multi-factor bizao phase draft, and the influence of various factors needs to be comprehensively considered.