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Refrigeration compressor preset technology used in air conditioners
Compressor selection When the compressor is selected, the rated capacity of the compressor should be left with a certain margin. The compressor of T3 condition is different from the compressor of T1 working condition, and there is a jet pipe in the lower part; the experimental system is selected. Comparing a T3 working condition with normal working conditions, indoor air condition °C outdoor side air state °C dry bulb temperature wet bulb temperature system rated ordinary T127193524 cold cooling tropical T329194624 transporting the largest ordinary T132234326 line running tropical T332235231 working conditions refrigeration cycle pressure焓Normal cooling capacity=G(Ha-Hh); injection cooling capacity=g(Hc-Hh) conventional input work=G(Hd'-Ha); injection input work=G(Hb-Ha)+(g+G)(Hd -Hc) Air-conditioning refrigeration cycle using supercooled liquid jet cooling method c-d shows the compression process of the refrigerant in the compressor, which is an isentropic process under ideal conditions; d-e shows that the refrigerant is condensing In the process of cooling and condensation, the pressure of the refrigerant remains unchanged during this process; e-f, e-h shows the throttling process, the pressure and temperature of the refrigerant decrease during the throttling process, but the enthalpy Leave unchanged; f-c
The heat exchanger selection is much higher due to the temperature of the T3 working condition than the T1 working condition. In order to avoid the condensing pressure being too high, the condenser area is correspondingly increased; the structural parameters of the evaporator used in the experimental system are the same as those of the T1 working condition.
It is a comparison of the structural parameters of the T3 working heat exchanger and the T1 working heat exchanger.
Test and analysis of the comparison between the T1 working condition and the air conditioner performance under the T3 working condition shows that the cooling capacity of each matching point of the T3 working condition is lower than the cooling capacity of each matching point corresponding to the T1 working condition, and the power consumption is high, which is due to the outdoor If the ambient temperature is too high, the temperature difference of the condenser heat exchange is reduced, causing the condensing pressure to rise, and the cooling capacity of the air conditioner is decreased.
The effect of the jet capillary on the performance of the air conditioner The temperature at the top of the shell is the temperature measured at the top of the compressor, which reflects the reliability of the operation of the refrigeration system, and the temperature at the top of the shell is low, indicating that the air conditioner has a strong anti-overload capability. Due to the main capillary, the injection capillary is in parallel relationship, the ejection capillary becomes shorter, the resistance of the ejection capillary becomes smaller, the flow rate into the ejection capillary will increase, the cooling efficiency of the press is better, and the temperature of the housing of the press is lowered, so that the press Have a good working environment and improve the reliability of the press. On the other hand, due to the shunting action of the jet capillary, a part of the supercooled refrigerant does not participate in the normal refrigeration cycle, and the compressor is used, and the cooling capacity is decreased from the experimental results. The selection of the jet capillary specification takes into account the reliability and cooling capacity. According to the test results, when the jet capillary flow rate is 1/12∽1/8 of the refrigerant circulation amount, the cooling power consumption changes little, and the cooling capacity is reasonable.
The effect of indoor relative humidity on the performance of air conditioners is hot in the Middle East, the climate is dry, the relative humidity of the rated cooling conditions is 38.4%, and the indoor relative humidity of the rated cooling corresponding to the T1 condition is 46.8%. In the T3 rated cooling condition (indoor side 29/19 ° C, outdoor side 46 / performance parameter compressor cooling capacity input power energy efficiency ratio capacitance corresponding to air conditioner specification model W24 ° C, run the air conditioner to stabilize, and then adjust the indoor side relative humidity The cooling capacity is tested, and the results show that the relative humidity has a great influence on the cooling capacity. The lower humidity is not conducive to the heat exchange of the indoor unit, and the increase of the indoor unit evaporation area is beneficial to increase the cooling capacity.
Concluding remarks The air conditioner of the T3 working condition is in a worse environment than the T1 working condition, and the condensation condition is poor. When designing the air conditioning system in the T3 working condition, the condenser area should be increased.
Reasonably choose the length of the injection pipe to minimize the loss of cooling while improving the safety of the air conditioner.