Theoretical And Experimental Study On The Performance Of The Two-Tank Air Pressure Feeding Refrigerant System Used In Refrigerated Warehouse

With the development of modern sciences, refrigeration has become an importantdiscipline both for industrial production and daily life, to which wide application has beenmade. Thus, energy saving research about refrigeration system as well as that on high-performance system is now a core subject in refrigeration field.To improve airside and refrigerant-side heat emission coefficient in evaporator channelare two major ways to enhance the heat transfer efficiency of evaporator. After equippedwith high efficiency fins on the airside or improving its air flow velocity, the heat transfercoefficient can be greatly improved but not without an upper limitation. Excessive air flowwould cause weight loss to refrigerated goods and add loads to evaporator and draught fanas well. So improving the refrigeration coefficient on the refrigerator side turns out to be anenergy-efficient solution. Accelerating refrigerant flow is the main step to enlarge heatemission coefficient on the refrigerant side, and compared with traditional refrigerantsupplying type of direct expansion which is hard to control due to the fact that stablerunning of compressor in refrigerating system takes control of the circulation volume ofrefrigerant and that the supplied refrigerant is equal to the amount of evaporation. Inconsequence, by using air pump to supply refrigerant to improve its liquid measure inevaporator, the flow velocity of refrigerant can be accelerated with heat transferperformance strengthened, as a result of which, hyper refrigerant supply can be achieved,with the contact area of evaporating pipe expanded and the heat transfer efficiencyimproved.Constructing experiment table for air pump refrigerant supply; designing electriccircuit diagram for air pump refrigerant supply control device; stabilizing the continuoussupply of refrigerant in the entire air pump. By applying heat balance method, theperformance characteristics of the system under different liquid measure are examined withthe heat transfer effect tested.Through adjusting air pressure of refrigerant supply, the liquid measure of evaporatorcan be controlled. The heat transfer capacity will reach its peak value when increasing thecirculating ratio of refrigerating system as air pressure rises. The system performancedifference (such as heat transfer coefficient, refrigerating capacity, COP, etc.) as well aschange rules of air pump and direct expansion supply mode can be got by means ofmeasuring technical parameters like pressure, temperature and refrigerating capacity of therefrigerating system under different working conditions.