Experiment 1: Refrigeration And Mechanical Heat Pump Experiment.pdf
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The relative sizes of the wire, refrigerant, and the amount of refrigerant in the trainer are not known, so there is uncertainty in the exact values of wire tension used in the calculations (Fig. 2). This is the root cause of the variation in the Tspan of refrigerant 320 and the subsequent COP of the heat pump (Fig. 2).
The wire tension is lowest in the central region of the trainer, where the air is at the lowest temperature and the hot wire is at the highest temperature. In this region the wire is constantly deflected by the opposing refrigerant and the wire is deformed repeatedly, thus inducing wire fatigue. The region of lowest wire tension is not immediately adjacent to the refrigerant, so the wire should be deformed at a lower rate. This is not true for the periphery of the trainer where the air is at the highest temperature, and therefore the wire is at the lowest temperature. The wire is stretched in the periphery and is slightly deformed. Again, this is not true for the central region, which has similar temperatures for the air and the refrigerant, but the wire is deformed and pulled in to the refrigerant. Some of the peripheral wires were detached during some experiments. The detached wire ended up next to the refrigerant and was in a region of high tension, and the wire did not fail. We suspect that the detached wires were in regions of high wire tension and were being pulled into the refrigerant and cooled to a point at which the wire failed.
The wire is stretched upon loading and compressed upon unloading. The compression and stretching of the wire is significant, but the stress is not applied to the entire wire. Rather, the wire is applied to the central region only, where it is strained and deformed. The wire is preloaded at rest with a tension of approximately 30% of the ultimate tensile strength. The amount of strain and resulting wire tension when the wires are deflected by the refrigerant is not known, but we estimate that it is at least twice the preload. We expect a steady increase in tension as the wire is stretched with the reduction in temperature of the air. The wire tension could be reduced by preheating the wire. The wire tension is reduced when the refrigerant is deflected to the periphery of the trainer. This is because the air is at a higher temperature, which will lower the potential for the refrigerant to cool the wire.
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