Low Charge Ammonia systems designed as Direct Expansion
- 作者: Elstrøm M.1
-
隶属关系:
- HB Products A/S
- 期: 卷 112, 编号 3 (2023)
- 页面: 165-174
- 栏目: Original Study Articles
- URL: https://journals.rcsi.science/0023-124X/article/view/263382
- DOI: https://doi.org/10.17816/RF633637
- ID: 263382
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详细
This work examines and proposes to study further those working fluids of refrigeration machines that can go into the liquid phase in a low–speed compressor unit because of their characteristics and operating parameters in the refrigeration machine. Further experimental confirmation of this will enable partial or complete elimination of the condenser unit in the refrigeration machine.
参考
- Nelson B. Thermodynamic Effects of Water in Ammonia on Evaporator Performance. In: Proceedings. Ammonia Refrigeration Conference and Exhibition, San Diego, California. IIAR, 2010.
- Elstrøm M. Capacitive Sensors Measuring the Vapor Quality. In: Proceedings13th IIR Gustav Lorentzen Conference, Valencia, 2018. doi: 10.18462/iir.gl.2018.1150
- Nielson B.I. DX Ammonia Piping Handbook. Colmac Coil, 2016.
- De Kerpel K. Refrigerant two-phase flow behaviour and pressure drop up- and downstream of a sharp return bend. Gent: Gent University, 2015.
- Jensen S.S. Recent Advances in Ammonia Dry Expansion Applications. In: IIR Proceedings. Yokohama, 2015.
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Fig. 1. Evaporator tubes with Inner-grooved surface.
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Fig. 2. Venturi VS Küba Cal liquid distribution (Kelvion/Küba).
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Fig. 3. DX evaporator with tank distributer and Vapor Quality Sensor.
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Fig. 4. Measuring ranges DX shown in h log P diagram.
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Fig. 5. Coefficient of heat transfer & Flow regime.
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Fig. 6: Capacitance VS different flow patterns.
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Fig. 7. Capacitance principle.
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Fig. 8. Comparison of Energy performances dual stage NH3 refrigeration system.
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Fig. 9. Idea for simple hot-gas defrost, in combination with a pressure control valve.
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