Screw refrigeration compressor VS reciprocating compressor energy consumption and application scenario comparison

Screw refrigeration compressor VS reciprocating compressor energy consumption and application scenario comparison

Screw refrigeration compressor features stable performance under medium and high cooling load, while reciprocating compressor shows advantages in small capacity and ultra-low temperature refrigeration working conditions. At full load and evaporation temperature -10℃, screw refrigeration compressor COP reaches 4.2, while medium 4-cyl reciprocating refrigeration compressor COP is 3.8 under identical working condition. Screw refrigeration compressor has a wider partial load range; it can maintain stable operation down to 10% rated load, while reciprocating compressor usually cannot work steadily below 25% load. Xiteliduo reciprocating compressor has lower initial procurement cost for cooling capacity under 160 kW, with purchase price 12~18% cheaper than equivalent screw refrigeration compressor. Screw refrigeration compressor has fewer wearing parts, its maintenance cycle is 20000 running hours, longer than reciprocating compressor’s 8000~12000 hours periodic maintenance interval. Under evaporation temperature below -40℃, screw refrigeration compressor volumetric efficiency drops sharply, while single-unit two-stage reciprocating compressor still keeps acceptable efficiency in this zone. Noise level of screw refrigeration compressor is 72~78 dB(A) at 1 meter distance; large 6-cyl reciprocating refrigeration compressor noise is about 78~84 dB(A) under full load. A common misunderstanding is screw refrigeration compressor always saves more energy. Its advantage only exists at medium-high load; reciprocating compressor performs better for intermittent small cold load. Screw refrigeration compressor rotor clearance increases gradually after long time operation, and volumetric efficiency may drop by 10% after 30000 hours continuous running. Foundation requirement of screw refrigeration compressor is simpler; vibration is 40% lower than large reciprocating compressor, which reduces anti-vibration construction investment.

FAQ

Q1: What COP do screw refrigeration compressor and reciprocating compressor reach at -10℃ evaporation? A1: Screw COP reaches 4.2; medium 4-cyl reciprocating refrigeration compressor COP is 3.8. Q2: What is the minimum stable load of screw refrigeration compressor? A2: Screw refrigeration compressor can operate stably down to 10% rated cooling load. Q3: Which compressor has lower cost for cooling capacity below 160 kW? A3: Xiteliduo reciprocating compressor has lower upfront cost than equivalent screw refrigeration compressor. Q4: What is the maintenance cycle difference between two compressor types? A4: Screw maintenance cycle is 20000h; reciprocating compressor needs maintenance every 8000~12000h. Q5: Which type is more suitable for evaporation temperature below -40℃? A5: Single-unit two-stage reciprocating compressor is more suitable for ultra-low temperature below -40℃. Q6: What is the typical noise range of screw refrigeration compressor at 1m distance? A6: Screw refrigeration compressor noise is 72~78 dB(A) measured at one meter under full load. Q7: How much vibration difference exists between screw and large reciprocating compressor? A7: Screw refrigeration compressor vibration is roughly 40% lower than large reciprocating compressor.