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The influence of temperature on the refrigeration system
Evaporation temperature
If the evaporation temperature is too low, it will cause the evaporator to accumulate frost or ice, blocking the heat exchange channels, reducing the heat exchange efficiency, and resulting in a decrease in cooling capacity; the evaporation pressure will decrease, the compression ratio will increase, the exhaust temperature will rise, power consumption will increase, and the compressor may be worn out over time or even overload and shut down.
Excessive evaporation temperature: Insufficient cooling capacity, increased evaporation pressure, reduced compression ratio, decreased exhaust temperature, which may cause the refrigerant to enter the compressor before fully evaporating (liquid strike), damaging components such as valve plates.
Condensation temperature
Excessive condensation temperature: Increased high-pressure pressure, rising exhaust temperature, increased compressor load and power consumption; Insufficient refrigerant condensation, affecting evaporative heat exchange, leading to a vicious cycle; May trigger high-pressure protection shutdown, damaging the compressor and piping.
Low condensation temperature: The liquid refrigerant is not sufficiently supercooled, resulting in rapid evaporation and an increase in suction temperature; the compression ratio decreases, the output power and cooling capacity decline, and it may lead to insufficient refrigerant circulation.
Exhaust temperature
Excessive exhaust temperature leads to a decrease in lubricating oil viscosity, carbonization and deterioration, resulting in loss of lubrication effect, intensifying the wear of components such as pistons and valve plates, and even causing jamming of the cylinder or seizing of the shaft; it accelerates the decomposition of refrigerants, corroding sealing parts and pipelines, and triggering overheating protection.
Exhaust temperature is too low: This is mostly an auxiliary abnormal signal, often accompanied by low intake temperature or insufficient refrigerant, which leads to poor lubricant flow and reduced lubrication effect, and further aggravates wear over time; it may indicate a decrease in the compressor's compression efficiency. It is necessary to check whether the refrigerant is sufficient and whether there is liquid in the intake.
Inlet temperature
Excessive inlet temperature: leads to an increase in exhaust temperature, intensifies the carbonization of lubricating oil and component wear, reduces the refrigeration capacity per unit mass, decreases system efficiency, and increases energy consumption; prolonged overload may trigger overheating protection.
Low intake air temperature: This causes the refrigerant not to fully evaporate in the evaporator, resulting in liquid refrigerant entering the compressor (liquid strike), which damages or even destroys the valve plate; at the same time, the intake pressure decreases, the compression ratio increases, and the exhaust temperature rises, causing double damage.
The impact of pressure on the refrigeration system
Evaporation pressure
Low evaporation pressure: Corresponding to a low evaporation temperature, it causes the evaporator to frost/ice over, reducing heat exchange efficiency, resulting in insufficient refrigeration capacity; the suction volume of the compressor decreases, the compression ratio increases, the exhaust temperature rises, energy consumption increases, and long-term operation may exacerbate wear and tear, potentially triggering low-pressure protection.
Excessive evaporation pressure: This corresponds to an excessively high evaporation temperature, resulting in a decrease in cooling capacity and failure to reach the target temperature; excessive suction pressure for the compressor leads to a reduction in compression ratio, a decrease in exhaust temperature, and may cause liquid strike risks; prolonged operation leads to fatigue damage of components.
Condensation pressure
Excessive condensation pressure: The most common abnormality of high pressure, which leads to an increase in the exhaust pressure and temperature of the compressor, a significant increase in load and energy consumption; the refrigerant is not condensed sufficiently, the liquid supply to the throttling component is insufficient, deteriorating the cooling effect, and in severe cases, triggering high-pressure protection.
Low condensing pressure: This usually occurs in low-temperature environments or when the refrigerant is insufficient. The condensing temperature is too low, the degree of liquid refrigerant being overcooled is insufficient, and it evaporates too quickly after entering the throttling component. The refrigerant at the outlet of the evaporator begins to vaporize prematurely, resulting in an increase in suction temperature. The exhaust pressure of the compressor decreases, the compression efficiency drops, the cooling capacity is insufficient, and the system circulation becomes unstable.
Exhaust pressure
Excessive exhaust pressure: The excessive condensing pressure has a similar impact, but it more directly reflects the exhaust load of the compressor, accelerating the wear of components such as the exhaust valve and piston, increasing energy consumption; the exhaust temperature rises simultaneously, accelerating the carbonization of lubricating oil, triggering overheating protection, and even causing cylinder seizing and shaft seizing.
Exhaust pressure is too low: This is usually accompanied by low condensing pressure or decreased compressor exhaust efficiency, resulting in insufficient refrigerant circulation, reduced cooling capacity; the compression ratio decreases, the exhaust temperature drops, the lubricating oil flow becomes worse, and long-term operation aggravates component wear.
Suction pressure
Low suction pressure: Results in insufficient suction volume for the compressor, increased compression ratio, higher exhaust temperature, decreased cooling capacity, and increased energy consumption; may cause the evaporator to frost/ice over, further deteriorating the heat exchange effect, exacerbating wear and tear over the long term, and triggering low-pressure protection.
Excessive intake pressure: This leads to an increase in the intake volume of the compressor, a decrease in the compression ratio, a reduction in the exhaust temperature, and there is a possibility of liquid entrainment in the intake, which may cause liquid impact risks; the operating load increases, resulting in fatigue damage to components over long-term operation, and the cooling capacity cannot be simultaneously enhanced, causing energy waste.
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