Performance Simulation Of Air-Conditioner Refrigeration System And Study Of Energy Efficiency

As the second energy consumption country, and the second carbon dioxide emission country, the energy consumption is very large in China every year. And the introducing pollution and greenhouse effect issues should be taken enough consideration. In the course of "tenth five", the energy strategy in China is to utilize the resource rationally and at the same time to improve the energy efficiency. The electricity consumption of refrigeration and air conditioning equipment is about 20% of the total electricity consumption. Therefore producing energy saving air conditioner is very important to our country, manufacturer and consumers. Applying computer simulation in air conditioning system is favorable to save experiment expense, shorten the period of product development and reduce the cost. It has become the important means for studying the system characteristic and optimizing the components. In this paper, the development of air conditioner simulation study inland and outland is researched. The simulation program is written by Visual Basic language, which can call NIST program for thermal properties of thirty-seven refrigerants through DLL file. It is very convenient and shortcut to call these thermal properties, which provides favorable base for simulation. The computation model for each component in the air conditioning system is built. The compressor numerical model is built for full hermetic types. The simulation results are satisfactory with the experimental comparison. The capillary model gives the judgment condition for choked flow, and computes the capillary length when occurring choked flow. The effect of inlet pressure, mass flux and super-cooling etc. on the capillary length is analyzed. The numerical model of refrigerant charge is built. The numerical models of condenser and evaporator are built and the effect of tube dimension, fin type on the heat transfer performance is analyzed, which provides some reference for enhancement heat exchanger. The development of air conditioner energy efficiency standard inland and outland is studied. The level of air cooled air conditioner energy efficiency ratio is compared with each other for different capacity range。In conclusion, improving the energy efficiency standard and increasing the energy efficiency ratio of the air conditioning equipment are important for developing the energy saving research of refrigeration equipment.