Matching the Compressor to the Power System The compressor developed in this paper is semi-closed and requires a matching power system. Considering the light weight requirements of the heat pump system, the power system uses a miniature brushless DC motor, and the optimization matching between the motor and the compressor is one of the key technologies of the heat pump. The matching method between the motor and the compressor: Firstly, according to the shaft power demand under the rated working condition of the compressor, select the motor whose calibration power is basically equal or slightly larger, and then determine the suitable transmission according to the rotational speed of the compressor and the motor under the respective rated working conditions. ratio. When measuring the shaft power of the compressor, a DC motor with a large calibration power is selected to drive the compressor to operate, and the input power of the motor is measured by a DC parameter measuring instrument, and then the shaft power of the compressor can be obtained according to the operating characteristic curve of the motor. , is the curve of the compressor shaft power with the speed. According to the curve of the cooling capacity of the heat pump system with the speed, the rated speed and shaft power of the compressor at a certain cooling capacity output can be obtained. The micro heat pump designed in this paper has a cooling capacity of 300W. Therefore, the rated speed of the compressor is 1650r/min, and the shaft power is 95W. The Faulhaber23863C is selected for the motor. The rated speed of the motor is 6500r/min, and the rated power is 108W. Consider the coupling. The transmission loss, when the rated power of the motor is different than the refrigerant of the compressor, the compressor shaft power P varies by 10% with the speed v curve, which can meet the demand of the micro compressor, and, according to the compressor rating Speed, the motor is equipped with a gearbox with a transmission ratio of 3.7:1. Development and comparison of micro air-cooled condensers The thermal resistance of air-cooled condensers is mainly on the air side. Parallel flow condensers with good heat transfer performance on the air side and high surface compactness are adopted. The structure is advanced and the heat transfer coefficient is high. Low consumption and small size make it a technically mature product. The heat exchanger weighs only 0.42 kg, and the parallel flow condenser is formed by a wavy arrangement of porous flat tubes and louver fins. The louvered fin structure of the tube-and-belt condenser has an extremely high heat transfer enhancement effect, and the surface heat transfer coefficient can be increased by more than three times as compared with the fin without the slit. Cross-sectional view of porous flat tube Contrasting heat transfer experiment of parallel flow air-cooled condenser and finned tube condenser with water instead of refrigerant. Since the air-cooled condenser fin cross-section heat transfer heat resistance is mainly on the air side, so water It is feasible to do alternative tests. Under the same experimental conditions, the heat transfer of the parallel flow condenser can reach about 400W, while the heat exchange capacity of the finned tube heat exchanger with a weight of 1.7kg is only 300W. Comparative experiments show that the parallel flow condenser has better lightweight performance and is suitable for the development of micro heat pumps. Micro-evaporator development and comparison experiment The micro-heat pump adopts a micro-spiral tube evaporator, which weighs only 0.16kg. It uses micro-EDM technology to form many micro-channels inside it, which greatly improves the heat exchange area per unit volume. Therefore, it is small in size, light in weight, and high in heat transfer efficiency. In addition, two other types of evaporators were designed: tube and sleeve type, and their weights were 0.12kg and 0.22kg respectively. The three evaporators were compared under the same working conditions. The results are as shown. The spiral tube type and tube belt evaporator can reach 280W, while the casing type evaporator is only about 200W, and the tube belt type has the smallest weight. However, considering the tube type is aluminum, it is difficult to connect with the system, so the spiral is selected. Tubular.
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