Performance Analysis Of Vapor Extracting Compression And Solar Ejector Coupling Refrigeration System

In order to use solar energy in the refrigeration system and further improve the refrigeration system performance,a vapor extracting compression and solar ejector coupling refrigeration system is proposed.The energy and exergy analysis model is established for this system,and the FORTRAN compiler language is used to calculate the model.The main work contents and conclusions are as follows:(1)The vapor extracting compression and solar ejector coupling refrigeration system is constructed,and the operation principle and process of the system are described.The thermodynamic model of intermediate exhaust of rolling rotor compressor,the one-dimensional calculation model of gas ejector and the thermodynamic model of other system components are constructed.(2)The influence of the structural parameters of the rolling rotor compressor on the system performance is analyzed,and a dual condensation refrigeration system is established to study the influence of the inlet and outlet working conditions of the compressor.The calculation results show that with the increase of eccentricity,the volume cavity of the compressor increases,the suction capacity and power consumption of the compressor increase,and the heat exchange of the evaporator increases;With the increase of the axial length of the cylinder,the volume of the working chamber of the compressor increases,and the power consumption of the compressor and the heat exchange of the evaporator increase;As the middle exhaust orifice moves in the positive direction of Y axis,the middle exhaust end angle of the compressor increases,the power consumption increases,and the mechanical performance of the system decreases.With the increase of suction pressure,the power consumption of compressor increases and the heat exchange of evaporator increases;With the increase of the middle exhaust back pressure,the power consumption of the compressor increases slightly and the heat exchange of the evaporator decreases;With the increase of the main exhaust back pressure,the power consumption of the compressor increases and the heat exchange of the evaporator decreases.(3)The influence of the set working conditions on the vapor extracting compression and solar ejector coupling refrigeration system performance is studied.With the increase of relative intermediate exhaust volume,the mechanical performance of the system improves.When the primary throttling pressure drop gradually increases,the overall mechanical performance of the system shows an upward trend;When the condensation temperature increases,the mechanical and thermal properties of the system show a downward and upward trend respectively;When the generation temperature rises,the mechanical performance of the system first increases and then decreases,and the thermal performance is positively correlated with the temperature;When the refrigeration system uses different refrigerants,it shows different thermodynamic properties.The calculation shows that the system using R134 a has certain advantages in mechanical and thermal properties over the systems using R1234 yf and R22.(4)The influence of the set working conditions on the exergy efficiency of the system and the exergy loss of each component is studied.With the increase of evaporation temperature and relative intermediate exhaust volume,the exergy efficiency of the system increases and decreases respectively;When the condensation temperature increases,the exergy efficiency of the system first increases and then decreases,and the total exergy loss of the system increases;When the generation temperature rises,the exergy efficiency and total exergy loss of the system rise;When the solar radiation intensity increases,the exergy efficiency increases,and the upward trend gradually slows down,and the exergy loss of each component increases greatly,among which the exergy loss of ejector accounts for the largest proportion.