Enemark和Roelsgaard证明，密封压缩机系统中的制冷剂加注量会影响压缩机电机的启动负载。在选择压缩机电机时，该负载是一个关键因素，尤其是当制冷设备必须在环境温度为104华氏度（4摄氏度）至113华氏度（45摄氏度）的热带地区工作，且电源电压可低至额定电压的80%时。在大多数情况下，使用接收器来确保足够的制冷剂供应是完全令人满意的。 但也有一些情况，即在航空航天应用中，将核电站的重量保持在最低是至关重要的。在某些情况下，可能需要在与电厂正常工作条件截然不同的条件下对电厂进行充电。有两种方法可以确定！9这些工厂所需的费用:模拟工厂的工作条件，计算所需的准确费用。后一种方法的优势在于，在设计阶段进行的精确计算减轻了设备投入运行时进行修改的需要。 其次，虽然可以在各种蒸发器和冷凝器负载下测试工厂包装的设备，但对于现场安装的设备，这通常是不可能的:在这种情况下，在设计阶段使用计算机模拟设备是可取的。在过去，制冷系统的设计师们的设计是基于各种系统组件的热量和质量流量平衡。然而，从我们推导的公式可以看出，制冷剂加注量以及冷凝器和蒸发器的内部容积都会影响蒸汽压缩制冷装置的整体性能。 大多数现代管壳式冷凝器的设计都是为了能够充当液体接收器。在这些两用冷凝器中，下部管束浸没在液体制冷剂中。查多克证明，这种液体制冷剂起到了绝缘膜的作用，减少了通过这些较低管束传递的热量。导出的公式可用于计算冷凝器和蒸发器中的液体和蒸汽量。知道液体制冷剂的存在量后，计算浸入液体中的总传热表面是一个简单的过程，因此可以设计出最佳的传热表面结构。 引用:ASHRAE交易，第81卷，第一部分，新泽西州大西洋城

Enemark and Roelsgaard demonstrated that the amount of refrigerant charge in a hermetically sealed compressor system would affect the starting load applied to the compressor motor. This load is a critical factor in the selection of compressor motors, particularly when the refrigeration plant has to work in tropical areas where ambient temperatures of 104F (4OC) to 113F (45C) are found and supply voltage can be as low as 80% of the rated voltage.In the majority of cases the use of a receiver to ensure adequate supply of refrigerant is perfectly satisfactory. But there are instances, namely in aero-space applications, where it is of fundamental importance that the weight of the plant should be maintained at a :minimum. In some cases, it might be necessary to charge a plant under conditions vastly different than those appertaining to the normal working conditions of the plant. There are two methods available to determin!9 the charge required by these plants:To simulate the working conditions of the plant in the factoryTo calculate the accurate charge required.The later method has an advantage in that accurate calculations carried out during the design stage alleviate the need for modifications of the plant when placed in operation. Secondly, while it is possible to test factory packaged equipment at various evaporator and condenser loads, this is often impossible for field erected equipment: in this case, the use of a computer simulation of the plant during the design stage is desirable.In the past, designers of refrigeration systems have based their designs on a heat and mass flow balance in the various system components. However, it will be seen from the formulae we derive that both the amount of refrigerant charge and the internal volume of the condenser and evaporator can influence the overall performance of a vapor compression refrigeration plant.Most modern shell-and-tube condensers are designed so that they can act as liquid receivers. In these dual purpose condensers the lower tube bundles are submerged in the liquid refrigerant. Chaddock proved that this liquid refrigerant serves as an insulating film, reducing the heat transferred through these lower tube bundles.The formulae derived can be used to calculate the amount of liquid and vapor in both the condenser and evaporator. Knowing the amount of liquid refrigerant present, it is a simple procedure to calculate the total heat transfer surface submerged in the liquid so an optimum heat transfer surface configuration can be designed.