An angular speed,acceleration and tangential leakage of a synchronal rotary compressor in which both bladed rotor and a cylinder are discussed.The calculation formulae of revolving speed of cylinder and relative speed...An angular speed,acceleration and tangential leakage of a synchronal rotary compressor in which both bladed rotor and a cylinder are discussed.The calculation formulae of revolving speed of cylinder and relative speed between the cylinder and bladed rotor are deduced detailedly in this paper.The variation of tangential speed and cylinder acceleration with angular position is investigated for a complete cycle.And some key parameters affected the relative speed are found out,viz,the relative speed depends on the radius of the cylinder and rotary speed of the axis,and the ratio of the cylinder to bladed rotor has not too much influence.It is the theoretic basis of designing and optimizing of structure characteristic of a synchronal rotary compressor.Also a computing formula of leakage related with rotary speed is deduced.It could supply references to thermodynamic calculating.展开更多
A novel way for a compressor to improve its coefficient of performance was proposed in this paper.Fullerenes(C70)and NiFe2O4 nanocomposites were modified by span 80 and dispersed in refrigeration oil by solid grinding...A novel way for a compressor to improve its coefficient of performance was proposed in this paper.Fullerenes(C70)and NiFe2O4 nanocomposites were modified by span 80 and dispersed in refrigeration oil by solid grinding(SG).Besides,the tribological properties of the nanocomposites were investigated using a four ball friction tester.The results show that when the mass concentration of fullerenes nanocomposite is higher than 60 ppm and the concentration of nano-oil is 2 g/L,the friction coefficient decreases from 0.13 to 0.06 which means the wear is reduced.The coefficient of performance of the compressor under the air conditioning test condition can be raised by 1.23%.展开更多
In the age of global warming, energy saving features and overall reduction of environmental impact are critical components that must be addressed when developing new HVAC （heating ventilation and air conditioning） u...In the age of global warming, energy saving features and overall reduction of environmental impact are critical components that must be addressed when developing new HVAC （heating ventilation and air conditioning） units. We chose R32 refrigerant, with its lower LCCP （life cycle climate performance） as a more sustainable choice than R410A. However, R32 has its drawbacks. Due to its smaller molecular weight, internal leakage loss is higher for R32. Moreover, high discharge gas temperature decreases the reliability of the compressor, and makes a large overheating loss increase. In this study, we will describe the technologies （reducing the piston pressurizing force, heat-insulating structure, optimizing the port diameter） that were developed to overcome these drawbacks. We will also oresent the performance and reliability of the newly develoned high efficiency swing, comnressor series for R32 refrigerant.展开更多
文摘An angular speed,acceleration and tangential leakage of a synchronal rotary compressor in which both bladed rotor and a cylinder are discussed.The calculation formulae of revolving speed of cylinder and relative speed between the cylinder and bladed rotor are deduced detailedly in this paper.The variation of tangential speed and cylinder acceleration with angular position is investigated for a complete cycle.And some key parameters affected the relative speed are found out,viz,the relative speed depends on the radius of the cylinder and rotary speed of the axis,and the ratio of the cylinder to bladed rotor has not too much influence.It is the theoretic basis of designing and optimizing of structure characteristic of a synchronal rotary compressor.Also a computing formula of leakage related with rotary speed is deduced.It could supply references to thermodynamic calculating.
文摘A novel way for a compressor to improve its coefficient of performance was proposed in this paper.Fullerenes(C70)and NiFe2O4 nanocomposites were modified by span 80 and dispersed in refrigeration oil by solid grinding(SG).Besides,the tribological properties of the nanocomposites were investigated using a four ball friction tester.The results show that when the mass concentration of fullerenes nanocomposite is higher than 60 ppm and the concentration of nano-oil is 2 g/L,the friction coefficient decreases from 0.13 to 0.06 which means the wear is reduced.The coefficient of performance of the compressor under the air conditioning test condition can be raised by 1.23%.
文摘In the age of global warming, energy saving features and overall reduction of environmental impact are critical components that must be addressed when developing new HVAC （heating ventilation and air conditioning） units. We chose R32 refrigerant, with its lower LCCP （life cycle climate performance） as a more sustainable choice than R410A. However, R32 has its drawbacks. Due to its smaller molecular weight, internal leakage loss is higher for R32. Moreover, high discharge gas temperature decreases the reliability of the compressor, and makes a large overheating loss increase. In this study, we will describe the technologies （reducing the piston pressurizing force, heat-insulating structure, optimizing the port diameter） that were developed to overcome these drawbacks. We will also oresent the performance and reliability of the newly develoned high efficiency swing, comnressor series for R32 refrigerant.
