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Development of switchless thin-plate type sorption compressor cell for 5 K sorption J-T refrigerator
Cryogenics ( IF 2.1 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.cryogenics.2020.103112 Junhyuk Bae , Dohoon Kwon , Sangkwon Jeong
Cryogenics ( IF 2.1 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.cryogenics.2020.103112 Junhyuk Bae , Dohoon Kwon , Sangkwon Jeong
Abstract A sorption J-T (Joule-Thomson) refrigerator is a J-T refrigerator using a sorption compressor that compresses refrigerant by adsorption and desorption in sorption cells. When the sorption cell of the compressor is cooled, the refrigerant is adsorbed on the adsorbent, reducing the pressure of the cell. In contrast, when the cell is heated, its pressure increases due to desorption of the refrigerant from the adsorbent. The sorption cells should operate in pairs to produce a continuous pressure gradient for J-T expansion since the cell can create pressure periodically. Therefore, to increase cooling capacity of the refrigerator, it is indispensable to reduce the cycle time by accelerating thermal response of the sorption cell. This paper suggests a thin-plate type sorption cell to maximize the heat diffusion to the adsorbent. Furthermore, because its temperature can be altered rapidly, the sorption compressor can operate without a heat switch to regulate heating and cooling of the sorption cell. The sorption cell is made of stainless steel 304 with width and length of 100 mm and height of 4.6 mm, respectively. The activated charcoal with two different nominal sizes is charged into the cell as an adsorbent of helium for cooling at 5 K. On the top and the bottom side of the cell, the cold head of G-M (Gifford-McMahon) refrigerator and the polyimide film heater are attached to adsorb and desorb helium in the cell, respectively. Its ability to build the pressure is verified by heating the cell which contains constant mass of helium. Furthermore, the mass of helium adsorbed on activated charcoal at various temperature are measured by expanding helium from a reservoir to the sorption cell to construct the precise prediction model. Subsequently, the operation parameters for sorption compressor are determined employing a prediction model which is validated by the cooling-down and the heating-up experiment. The predicted mass flow rate and the cycle time of the compressor are 2.37 mg/s and 55.4 s, respectively. Consequently, the cooling capacity of the sorption J-T refrigerator with recuperative heat exchanger is predicted as 2.2 mW at 5 K.
中文翻译:
5K吸附式JT制冷机无开关薄板式吸附式压缩机单元的研制
摘要 吸附式 JT (Joule-Thomson) 制冷机是使用吸附式压缩机的 JT 制冷机,该压缩机通过吸附单元中的吸附和解吸来压缩制冷剂。当压缩机的吸附单元冷却时,制冷剂被吸附在吸附剂上,从而降低单元的压力。相反,当电池被加热时,由于制冷剂从吸附剂上解吸,其压力增加。吸附单元应成对运行,以便为 JT 膨胀产生连续的压力梯度,因为吸附单元可以周期性地产生压力。因此,要提高冰箱的冷却能力,必须通过加速吸附池的热响应来缩短循环时间。本文建议使用一种薄板型吸附单元,以最大限度地提高向吸附剂的热扩散。此外,因为它的温度可以快速改变,所以吸附压缩机可以在没有热开关的情况下运行来调节吸附单元的加热和冷却。吸附池由不锈钢 304 制成,宽度和长度分别为 100 mm 和 4.6 mm。将两种不同标称尺寸的活性炭装入电池作为氦气的吸附剂,冷却至 5K。在电池的顶部和底部,GM(Gifford-McMahon)冰箱的冷头和聚酰亚胺薄膜加热器分别吸附和解吸电池中的氦气。通过加热含有恒定质量氦气的电池来验证其建立压力的能力。此外,在不同温度下吸附在活性炭上的氦的质量是通过将氦从储罐扩展到吸附单元来测量的,以构建精确的预测模型。随后,采用经过冷却和加热实验验证的预测模型确定吸附式压缩机的运行参数。预计的压缩机质量流量和循环时间分别为 2.37 mg/s 和 55.4 s。因此,带有同流换热器的吸附式 JT 制冷机的冷却能力在 5 K 时预计为 2.2 mW。预计的压缩机质量流量和循环时间分别为 2.37 mg/s 和 55.4 s。因此,带有同流换热器的吸附式 JT 制冷机的冷却能力在 5 K 时预计为 2.2 mW。预计的压缩机质量流量和循环时间分别为 2.37 mg/s 和 55.4 s。因此,带有同流换热器的吸附式 JT 制冷机的冷却能力在 5 K 时预计为 2.2 mW。
更新日期:2020-07-01
中文翻译:
5K吸附式JT制冷机无开关薄板式吸附式压缩机单元的研制
摘要 吸附式 JT (Joule-Thomson) 制冷机是使用吸附式压缩机的 JT 制冷机,该压缩机通过吸附单元中的吸附和解吸来压缩制冷剂。当压缩机的吸附单元冷却时,制冷剂被吸附在吸附剂上,从而降低单元的压力。相反,当电池被加热时,由于制冷剂从吸附剂上解吸,其压力增加。吸附单元应成对运行,以便为 JT 膨胀产生连续的压力梯度,因为吸附单元可以周期性地产生压力。因此,要提高冰箱的冷却能力,必须通过加速吸附池的热响应来缩短循环时间。本文建议使用一种薄板型吸附单元,以最大限度地提高向吸附剂的热扩散。此外,因为它的温度可以快速改变,所以吸附压缩机可以在没有热开关的情况下运行来调节吸附单元的加热和冷却。吸附池由不锈钢 304 制成,宽度和长度分别为 100 mm 和 4.6 mm。将两种不同标称尺寸的活性炭装入电池作为氦气的吸附剂,冷却至 5K。在电池的顶部和底部,GM(Gifford-McMahon)冰箱的冷头和聚酰亚胺薄膜加热器分别吸附和解吸电池中的氦气。通过加热含有恒定质量氦气的电池来验证其建立压力的能力。此外,在不同温度下吸附在活性炭上的氦的质量是通过将氦从储罐扩展到吸附单元来测量的,以构建精确的预测模型。随后,采用经过冷却和加热实验验证的预测模型确定吸附式压缩机的运行参数。预计的压缩机质量流量和循环时间分别为 2.37 mg/s 和 55.4 s。因此,带有同流换热器的吸附式 JT 制冷机的冷却能力在 5 K 时预计为 2.2 mW。预计的压缩机质量流量和循环时间分别为 2.37 mg/s 和 55.4 s。因此,带有同流换热器的吸附式 JT 制冷机的冷却能力在 5 K 时预计为 2.2 mW。预计的压缩机质量流量和循环时间分别为 2.37 mg/s 和 55.4 s。因此,带有同流换热器的吸附式 JT 制冷机的冷却能力在 5 K 时预计为 2.2 mW。