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Solar driven multi-effect sub-zero ammonia based sorption cycles.
Author(s) : VASILESCU C., INFANTE FERREIRA C.
Summary
Previously, McGahey et al. (1994) and Garimella et al. (1997) have studied the performance of double-effect sorption cycles using among others ammonia-sodium thiocyanate as working fluid. This was based on steady-state simulation models. The objective of this study is to investigate the feasibility of multi-effect high temperature ammonia-based sorption systems for refrigeration applications with sub-zero evaporating temperatures. A modular simulation tool has been developed using the object-oriented programming concept for flexible simulation of solar absorption systems in order to investigate various cycle configurations with different working fluids. Simulations have been performed to predict the dynamic performance of multi-effect ammonia-based absorption cycles driven by parabolic trough solar collectors under Mediterranean summer conditions. A comparison is first carried out for air-conditioning applications with double-effect LiBr-H2O as a reference so that existing experimental data can be used to validate the model. The validated model is then used for ammonia-lithium nitrate at low operating temperatures. Some results obtained for freezing temperature applications are presented and discussed.
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Pages: 885-892
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Details
- Original title: Solar driven multi-effect sub-zero ammonia based sorption cycles.
- Record ID : 30001293
- Languages: English
- Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
- Publication date: 2011/04/06
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Indexing
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Themes:
Other air-conditioning equipment;
Absorption and adsorption systems;
Solar refrigeration - Keywords: Working fluid; Solar collector; Refrigerating system; Lithium; Thiocyanate; Ammonia; Absorption system; Sodium; Salt (generic); Performance; Mediterranean country; Modelling; Nitrate; Solar energy; COP; Air conditioning
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