3638 Effectiveness of power generation and refrigeration cycle using ammonia-water mixture to sensible heat source

2005 ◽  
Vol 2005.3 (0) ◽  
pp. 313-314
Author(s):  
Keisuke TAKESHITA ◽  
Akinori NAGASHIMA ◽  
Yoshiharu AMANO ◽  
Takumi HASHIZUME
Keyword(s):  
Power Generation ◽  
Heat Source ◽  
Refrigeration Cycle ◽  
Water Mixture ◽  
Sensible Heat ◽  
Ammonia Water

Experimental Results of an Ammonia-Water Mixture Turbine System: Effectiveness With a Low Temperature Heat Source

2004 ◽  
Author(s):  
Keisuke Takeshita ◽  
Kouji Morimoto ◽  
Yoshiharu Amano ◽  
Takumi Hashizume
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Steam Turbine ◽  
Back Pressure ◽  
Experimental Results ◽  
Water Mixture ◽  
Heat Sources ◽  
Sensible Heat ◽  
Ammonia Water ◽  
Temperature Heat

This paper presents an experimental investigation of the effectiveness of an AWM (Ammonia-Water Mixture) turbine system with low temperature heat sources. The AWM turbine system (AWMTS) features Kalina cycle technology, namely, it employs an ammonia-water mixture as the working fluid and includes a separation / absorption process of NH3-H2O. Since AWM is a non-azeotropic mixture, its temperature changes during evaporation and condensation. This behavior gives AWMTS the advantage of heat recovery from a sensible heat source such as exhaust gas. It is known that an AWMTS can generate more power than a Rankine cycle system from 250–650°C sensible heat sources. The authors constructed a 70 KW-experimental facility and investigated the practical applications of AWMTS. It is located at the bottoming stage below a conventional combined cycle composed of a gas turbine and a steam turbine. Its heat source is the exhaust steam from a back pressure steam turbine at the middle stage of the system. The experiment was carried out with changing the back pressure of the steam turbine. The experimental results show that power generation is possible from 138 to 162 °C heat source steam.

scholarly journals Thermodynamic analysis and simulation of a new combined power and refrigeration cycle using artificial neural network

2011 ◽  
Vol 15 (1) ◽  
pp. 29-41 ◽  
Author(s):  
Abdolreza Fazeli ◽  
Hossein Rezvantalab ◽  
Farshad Kowsary
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Heat Source ◽  
Exergy Efficiency ◽  
Combined Cycle ◽  
Cycle Performance ◽  
Working Fluid ◽  
Refrigeration Cycle ◽  
Water Mixture ◽  
Artificial Neural

In this study, a new combined power and refrigeration cycle is proposed, which combines the Rankine and absorption refrigeration cycles. Using a binary ammonia-water mixture as the working fluid, this combined cycle produces both power and refrigeration output simultaneously by employing only one external heat source. In order to achieve the highest possible exergy efficiency, a secondary turbine is inserted to expand the hot weak solution leaving the boiler. Moreover, an artificial neural network (ANN) is used to simulate the thermodynamic properties and the relationship between the input thermodynamic variables on the cycle performance. It is shown that turbine inlet pressure, as well as heat source and refrigeration temperatures have significant effects on the net power output, refrigeration output and exergy efficiency of the combined cycle. In addition, the results of ANN are in excellent agreement with the mathematical simulation and cover a wider range for evaluation of cycle performance.

Exergy Analysis of a Combined Power and Refrigeration Thermodynamic Cycle Driven by a Solar Heat Source

2003 ◽  
Vol 125 (1) ◽  
pp. 55-60 ◽  
Author(s):  
Afif Akel Hasan ◽  
D. Y. Goswami
Keyword(s):  
Heat Source ◽  
Exergy Analysis ◽  
Thermodynamic Cycle ◽  
Exergy Efficiency ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Water Mixture ◽  
Exergy Destruction ◽  
Ammonia Water ◽  
Solar Heat

Exergy thermodynamics is employed to analyze a binary ammonia water mixture thermodynamic cycle that produces both power and refrigeration. The analysis includes exergy destruction for each component in the cycle as well as the first law and exergy efficiencies of the cycle. The optimum operating conditions are established by maximizing the cycle exergy efficiency for the case of a solar heat source. Performance of the cycle over a range of heat source temperatures of 320–460°K was investigated. It is found that increasing the heat source temperature does not necessarily produce higher exergy efficiency, as is the case for first law efficiency. The largest exergy destruction occurs in the absorber, while little exergy destruction takes place in the boiler.

A Totally Heat-Driven Refrigeration System Using Low-Temperature Heat Sources for Low-Temperature Applications

2019 ◽  
Vol 27 (02) ◽  
pp. 1950012 ◽  
Author(s):  
Zeynab Seyfouri ◽  
Mehran Ameri ◽  
Mozaffar Ali Mehrabian
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Rankine Cycle ◽  
Exergy Efficiency ◽  
Working Fluid ◽  
Refrigeration Cycle ◽  
Water Mixture ◽  
Refrigeration System ◽  
Power Requirement ◽  
Temperature Heat

In the present study, a totally heat-driven refrigeration system is proposed and thermodynamically analyzed. This system uses a low-temperature heat source such as geothermal energy or solar energy to produce cooling at freezing temperatures. The proposed system comprises a Rankine cycle (RC) and a hybrid GAX (HGAX) refrigeration cycle, in which the RC provides the power requirement of the HGAX cycle. An ammonia–water mixture is used in both RC and HGAX cycles as the working fluid. A comparative study is conducted in which the proposed system is compared with two other systems using GAX cycle and/or a single stage cycle, as the refrigeration cycle. The study shows that the proposed system is preferred to produce cooling at temperatures from 2∘C to [Formula: see text]C. A detailed parametric analysis of the proposed system is carried out. The results of the analysis show that the system can produce cooling at [Formula: see text]C using a low-temperature heat source at 133.5∘C with the exergy efficiency of about 20% without any input power. By increasing the heat source temperature to 160∘C, an exergy efficiency of 25% can be achieved.

A New Multidimensional Graph for the Einstein Refrigeration Cycle

2006 ◽  
Author(s):  
Araceli Lara V. ◽  
David Sandoval C. ◽  
Juan Morales G. ◽  
Raymundo Lo´pez C. ◽  
Arturo Lizardi R. ◽  
...  
Keyword(s):  
Binary Systems ◽  
Graphical Representation ◽  
Rankine Cycle ◽  
Refrigeration Cycle ◽  
Water Mixture ◽  
Exergy Destruction ◽  
Ammonia Water ◽  
Equilibrium Data ◽  
Multidimensional Representation ◽  
Thermodynamic Processes

An analysis of the exergy use in an Einstein refrigeration cycle is presented. The analysis is performed through the use of a new graphical multidimensional representation of the cycle. The Einstein refrigeration cycle works with ammonia, butane and water. These compounds are present in the cycle as several ammonia-water and ammonia-butane mixtures that have different compositions. In essence, the cycle transfers ammonia from an ammonia-water mixture to an ammoniabutane mixture in a series of processes and then it transfers ammonia back again to an ammonia-water mixture in another series of processes. The ammonia transfers involve heat absorptions and heat rejections that have as an effect the transfer of heat from a low temperature reservoir to a high temperature reservoir. The aforementioned multidimensional graph was built with equilibrium data of the ammonia-water and ammonia-butane binary systems for a 4 bar pressure and a 240 K to 350 K temperature range. The graphical representation is multidimensional because it shows in one graph values of concentration, temperature, enthalpy, entropy and exergy for ammonia-water mixtures and ammonia-butane mixtures. The thermodynamic states of all the process currents present in the cycle are showed in the graph, as well as are the different thermodynamic processes of the cycle. The exergy destruction rate of each device is clearly represented. The usefulness of this graph is similar to that of the T-s graph for a Rankine cycle.

215 Experimental Study Influence of Heat Source Conditions on OTEC System Using Ammonia/Water Mixture as Working Fluid

2006 ◽  
Vol 2006 (0) ◽  
pp. 71-72
Author(s):  
Yasuyuki IKEGAMI ◽  
Hiroyuki ASOU ◽  
Takeshi YASUNAGA ◽  
Hirokazu MANDA ◽  
Kaori KUBO
Keyword(s):  
Experimental Study ◽  
Heat Source ◽  
Working Fluid ◽  
Water Mixture ◽  
Ammonia Water

Characteristics of an Ammonia-Water Mixture Turbine System with Low Temperature Heat Source

2004 ◽  
Vol 2004.3 (0) ◽  
pp. 277-278
Author(s):  
Keisuke TAKESHITA ◽  
Koji MORIMOTO ◽  
Yoshiharu AMANO ◽  
Takumi HASHIZUME
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Water Mixture ◽  
Ammonia Water ◽  
Temperature Heat

Comparison of Hybrid Configurations of Power Generation and Refrigeration Cycles Using Ammonia-Water Mixture

2004 ◽  
Vol 2004.3 (0) ◽  
pp. 275-276
Author(s):  
Keisuke TAKESHITA ◽  
Taiji SATO ◽  
Yoshiharu AMANO ◽  
Takumi HASHIZUME
Keyword(s):  
Power Generation ◽  
Water Mixture ◽  
Ammonia Water

OS4-6 Characteristics of an Exhaust Gas Driven Hybrid Power and Refrigeration Cycle with Ammonia-Water Mixture

2007 ◽  
Vol 2007.12 (0) ◽  
pp. 183-186
Author(s):  
Yusuke KATAYAMA ◽  
Yusuke OJIMA ◽  
Yoshiharu AMANO ◽  
Takumi HASHIZUME
Keyword(s):  
Refrigeration Cycle ◽  
Exhaust Gas ◽  
Water Mixture ◽  
Ammonia Water ◽  
Hybrid Power

Experimental Investigations of Oscillatory Fluctuation in an Ammonia-Water Mixture Turbine System

2005 ◽  
Author(s):  
Yoshiharu Amano ◽  
Keisuke Kawanishi ◽  
Takumi Hashizume
Keyword(s):  
Low Temperature ◽  
Heat Source ◽  
Flow Rate ◽  
Mass Fraction ◽  
Working Fluid ◽  
Experimental Investigations ◽  
Water Mixture ◽  
Kalina Cycle ◽  
Ammonia Water ◽  
Temperature Heat

This paper reports results from experimental investigations of the dynamics of an ammonia-water mixture turbine system. The mixture turbine system features Kalina Cycle technology [1]. The working fluid is an ammonia-water mixture (AWM), which enhances the power production recovered from the low-temperature heat source [2], [3]. The Kalina Cycle is superior to the Rankine Cycle for a low temperature heat source [4], [5]. The ammonia-water mixture turbine system has distillation-condensation processes. The subsystem produces ammonia-rich vapor and a lean solution at the separator, and the vapor and the solution converge at the condenser. The mass balance of ammonia and water is maintained by a level control at the separator and reservoirs at the condensers. Since the ammonia mass fraction in the cycle has a high sensitivity to the evaporation/condensation pressure and vapor flow rate in the cycle, the pressure change gives rise to a flow rate change and then level changes in the separators and reservoirs and vice versa. From the experimental investigation of the ammonia-water mixture turbine system, it was observed that the sensitivity of the evaporating flow rate and solution liquid density in the cycle is very high, and those sensitivity factors are affected by the ammonia-mass fraction. This paper presents the experimental results of a study on the dynamics of the distillation process of the ammonia-water mixture turbine system and uses the results of investigation to explain the mechanism of the unstable fluctuation in the system.

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