Semi closed screw compressor for heat pump unit | Analysis of refrigerant and load regulation for waste heat recovery heating conditions
Industrial heat pump units rely on refrigerant reverse circulation to recover waste heat, with a water outlet temperature of 45 ℃~65 ℃. Semi closed screw refrigeration compressors are selected, which can simultaneously achieve both cooling and heating conditions.
The pressure ratio of the heat pump operating condition is higher than that of the conventional chiller unit, and the temperature on the condensing side increases. The volumetric efficiency of the screw compressor decreases with the increase of the outlet water temperature. When the outlet water temperature is 60 ℃, the efficiency decreases by 21% compared to the 25 ℃ operating condition.
Xitelidou semi enclosed screw compressor is suitable for commercial and industrial heat pump units, with R507 and R134a being mainstream options, and R32 heat pump models gradually being promoted in compliant explosion-proof areas.
The heat source side of the heat pump unit is mostly wastewater and air waste heat. When the temperature of the heat source fluctuates by ± 8 ℃, the screw stepless adjustment system automatically matches the load and stabilizes the deviation of the effluent temperature within ± 1 ℃.
The discharge pressure of the compressor will significantly increase under high-temperature heating conditions. The upper limit of high pressure control for R507 heating conditions is 20 bar. Long term overpressure operation will double the aging rate of the seals.
The separation efficiency of the oil separator in the heat pump system is required to be ≥ 99.6%. Under heating conditions, the oil temperature is higher, the oxidation rate of the oil is accelerated, and the refrigeration oil replacement cycle is shortened to 3500 hours.
Southeast Asian industrial waste heat recovery heat pump inquiries continue to rise, with factories supporting hot water and drying production lines. Foreign trade procurement prioritizes air-cooled screw heat pump units to reduce investment in cooling water matching.
The rotor of the screw compressor is sensitive to impurities, and waste heat and wastewater heat exchange can easily introduce impurities. Therefore, a 100 mesh filtration device is installed in the system to control impurities below 35mg/kg and protect the rotor.
Which is better, screw or piston compressor? Under high compression ratio conditions of heat pumps, screw models have stronger stability in continuous operation, while piston models are more suitable for low-power intermittent heat pump scenarios.
The CE certification of export heat pump units includes two tests: safety and energy efficiency. Some EU purchasers require additional ERP energy efficiency reports, and the data preparation period is longer than that of ordinary cold storage units.
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FAQ
What is the conventional outlet temperature range for industrial heat pumps? Mainstream heating effluent temperature ranges from 45 ℃ to 65 ℃.
How much does the efficiency of the screw decrease under 60 ℃ hot water conditions? Compared to low-temperature conditions, the volumetric efficiency decreased by 21%.
How long does it take to replace the refrigeration oil of the heat pump unit? High temperature oxidation is fast, it is recommended to replace the refrigeration oil after 3500 hours.
What is the high pressure protection threshold set for heat pump R507? The recommended upper limit for high pressure in heating conditions is 20 bar.
What is the minimum separation efficiency requirement for heat pump oil? A separation efficiency of 99.6% or higher is required.
What is the allowable range for temperature fluctuations in the heat source? The screw unit can stably adjust the load within ± 8 ℃.
What is the recommended filtration accuracy for heat pump systems? Recommend installing a 100 mesh filter to intercept impurities.
