a review of organic rankine, kalina and goswami cycle

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  • 7/25/2019 A review of organic rankine, Kalina and Goswami cycle

    1/16

    International Journal of Engineering Technology, Management and Applied Sciences

    www.ijetmas.com September 2015, Volume 3, Special Issue, ISSN 2349-4476

    90 M.N.Karimi, A. Dutta, A. Kaushik, H. Bansal, S. Z. Haque

    A Review of Organic Rankine, Kalina and Goswami Cycle

    M.N.Karimi, A. Dutta, A. Kaushik, H. Bansal, S. Z. HaqueDepartment of Mechanical Engineering,

    Faculty of Engineering & Technology, Jamia Millia Islamia, New Delhi

    Abstract

    In this paper review of three cycles namely Organic Rankine cycle, Kalina cycle and Goswami cycle and various

    works on them has been presented. This paper deals with the work done by different authors on optimization of the

    cycles and introduction of new cycles which gives better efficiency. Selection of fluids, three cycles namely Kalina

    Cycle, Goswami Cycle and Organic Rankine cycle (ORC) have been optimized by different authors using differenttypes of fluids and their reviews are concluded here. Low grade heat topic deals with the electricity generation

    from low grade heat sources such as solar thermal, geothermal and industrial waste heat using different cycles

    mainly ORC, Goswami Cycle and Kalina Cycle. In this paper, analysis of different thermodynamic cycle, for

    combined power plant using low grade heat sources are reviewed. Different thermodynamic cycle , using low

    grade heat sources for combined power plant are reviewed. Various cycles have been compared so as to find a

    best cycle to convert various low temperature heat sources into electrical power in various conditions using

    different methodologies used in research.

    Keywords: Organi c Ranki ne, Kalina, Goswami Cycle, Review

    1.

    INTRODUCTION

    In todays world, with the increasing population, the energy demands are rising but the

    resources (fossil fuels) are limited and depleting drastically. It is only a matter of time we runout of the major fuels namely oil, gas, and coal. Therefore we need to switch to some other

    source of energy. The other forms of energy available to us are solar, geothermal, wind, etc. Out

    of these solar and geothermal forms a source of heat, but there is a problem with them that they

    are low grade source of heat and possess low quality.

    Heat is itself a low grade form of energy. But low grade heat implies heat that is extracted from

    low- and mid- temperature sources that has less exergy density and cannot be converted

    efficiently to work. Although there is no unified specification on the temperature range of low-

    grade heat, it is understood that a heat source with temperature below 370C is considered as a

    low-grade heat source, because heat is considered not converted efficiently below that

    temperature using steam Rankine cycle. The main low-grade heat sources are from: Solarthermal, Geothermal, and industrial waste thermal.

    These days the focus is majorly on the benefits of capturing and utilising low grade thermal

    energy which are highly dependent on the qualities and properties of the heat in the waste

    streams. The temperature of the low grade heat stream is the most important parameter, as the

    effective use of the residual heat or efficiency of energy recovery from the low grade heat

    sources will mainly depend on the temperature difference between the source and a suitable

    sink. The process for converting the energy in a fuel into electric power involves the creation of

    mechanical work. For successful conversion of heat into mechanical work, thermodynamic

    cycles are used

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    International Journal of Engineering Technology, Management and Applied Sciences

    www.ijetmas.com September 2015, Volume 3, Special Issue, ISSN 2349-4476

    91 M.N.Karimi, A. Dutta, A. Kaushik, H. Bansal, S. Z. Haque

    1.1. Rankine cycleThe Rankine cycle is the fundamental operating cycle of all power plants where an operating

    fluid is continuously evaporated and condensed. The selection of operating fluid depends

    mainly on the available temperature range. Majorly Water (steam) is used as the working

    fluid. Fig. 1.1(a) shows the idealized Rankine cycle. Pressure-enthalpy (p-h) and temperature-

    entropy (T-s) diagrams of this cycle are given in Fig.1.1(b).

    Fig.1.1 (a) Rankine cycle configuration Fig.1.1 (b) T-s and p-h diagrams

    [Source:Thermopidia]

    1.2. Organic Rankine cycle

    The organic Rankine cycle (ORC) applies the principle of the steam Rankine cycle, but uses

    organic working fluids with low boiling points, instead of steam, to recover heat from a lower

    temperature heat source. Fig.1.2(a) below shows a schematic of an ORC and its process plotted

    in a T-s diagram in Fig.1.2(b). The cycle consists of an expansion turbine, a condenser, a pump,

    a boiler, and a super heater (provided that superheat is needed).

    Fig.1.2(a)Schematic Diagram of ORC Fig. 1.2 (b)T-s Diagram of ORC

    [Source:eng.usf.edu]

    http://www.thermopedia.com/content/1072/%5dhttp://www.thermopedia.com/content/1072/%5dhttp://www.thermopedia.com/content/1072/%5dhttp://www.eng.usf.edu/~hchen4/Organic%20Rankine%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Organic%20Rankine%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Organic%20Rankine%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Organic%20Rankine%20Cycle.htmhttp://www.thermopedia.com/content/1072/%5d
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    1.3. Kalina cycleThe Kalina cycle was first developed by AleksandrKalina in the late 1970s and early 1980s.

    Since then, several Kalina cycles have been proposed based on different applications. Kalina

    cycle uses a working fluid comprised of at least two different components, typically water and

    ammonia. The ratio between those components varies in different parts of the system to

    decrease thermodynamic irreversibility and therefore increase the overall thermodynamic

    efficiency. A basic configuration of the Kalina cycle is shown in Fig.1.3.

    Fig. 1.3. Basic configuration of Kalina cycle

    [Source:eng.usf.edu]

    One drawback of the Kalina cycle is the fact that high vapour fraction is needed in the boiler,however, the heat exchanger surface is easy to dry out at high vapour fractions, resulting in

    lower overall heat transfer coefficients and a larger heat exchange area. Another drawback

    relates to the corrosivity of ammonia. Impurities in liquid ammonia such as air or carbon

    dioxide can cause stress corrosion cracking of mild steel and also ammonia is highly corrosive

    towards copper and zinc.

    1.4. Goswami cycle

    Goswami cycle, proposed by Dr. Yogi Goswami (1998) is a novel thermodynamic cycle that

    uses binary mixture to produce power and refrigeration simultaneously in one loop.

    Fig.1.4. Basic configuration of the combined power and cooling cycle

    [Source:eng.usf.edu]

    http://www.eng.usf.edu/~hchen4/Kalina%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Kalina%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Kalina%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Goswami%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Goswami%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Goswami%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Goswami%20Cycle.htmhttp://www.eng.usf.edu/~hchen4/Kalina%20Cycle.htm
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    This cycle is a combination of Rankine power cycle and an absorption cooling cycle. Itsadvantages include the production of power and cooling in the same cycle, the design flexibility

    to produce any combination of power and refrigeration, the efficient conversion of moderate

    temperature heat sources, and the possibility of improved resource utilization compared to

    separate power and cooling systems. The binary mixture first used was ammonia-water, and

    later on new binary fluids were proposed and studied. A configuration of the cycle is shown in

    Fig.1.4.

    2.0. LITERATURE REVIEW

    Considering only the low grade heat operating cycles namely Organic Rankine cycle, Kalina

    cycle and Goswami cycle has been carried out. The following are the areas of sub-division ofthe whole review.

    Comparison of different cycles.This topic majorly deals with comparison of different cycles. Comparison of different cycles

    helps to combat and find an appropriate cycle for conversion.

    Optimization

    This topic deals with the various methods that has been done to improve the efficiency of

    existing cycles either by making changes with previous cycles or by introduction of new cycles

    Selection of Working fluids

    The efficiency of non-conventional cycles depends upon selection of fluids to a huge extent.The work done by number of authors on selection of fluid for ORC, Kalina and Goswami cycle

    is presented.

    Low-Grade EnergyIn this topic, developing other thermodynamics cycles to convert the low-grade heat into

    electrical power is implemented. Organic Rankine cycle, Goswami cycle and Kalina cycle are

    the major cycles that have been developed for the conversion of low grade of heat into

    electricity.

    2.1. COMPARISON OF DIFFERENT CYCLES

    In thermodynamics, the Carnot cycle has been described as being the most efficient thermal

    cycle possible, wherein there are no heat losses and consisting of four reversible processes, twoisothermal and two adiabatic. It has also been described as a cycle of expansion and

    compression of a reversible heat engine that does work with no loss of heat. Moreover, there are

    vast amounts of renewable energy sources such as solar, thermal, geothermal, biomass and

    industrial waste heat. The moderate temperature heat from these sources cannot be converted

    efficiently to electrical power by conventional power generation methods. Therefore, how to

    convert these low-grade temperature heat sources into electrical power is of great significance.

    Therefore, comparison of different cycles helps to combat and find an appropriate cycle for

    conversion.

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    Fig.2.1. T-S diagram of the subcritical ORC and transcritical Rankine a) T-S diagram of subcritical ORC

    b) T-S diagram of transcritical Rankine

    [Source: Z. Shengjun et al [15]]

    Prof. Pall Valdimarsson et al [24] said the Kalina cycle is a power cycle and competes with

    Rankine, Brayton, Diesel and Otto cycles. He compared it theoretically with other processes for

    different boundary conditions (in real life energy situations). Also both Y. Chena [12] and

    Zhang Shengjun [15] presented a comparative study between ORC and transcritical powerCycle. Y. Chena [12] compared the performance of carbon dioxide transcritical power cycle,

    which operates between subcritical and supercritical state (i.e. under and above critical point

    respectively) with an ORC (with R123 as a working fluid) in waste heat (low grade heat)

    recovery. Whereas Zhang Shengjun [15] performed comparison and parametric optimization of

    subcritical ORC and transcritical power cycle system for low temperature (i.e. 80100C)

    geothermal power generation & concluded that R125 in transcritical power cycle shows

    excellent economic and environmental performance and can maximize utilization of the

    geothermal power.

    Recently M. Yari et al [50] analysed the performance of trilateral power cycle (TLC) andcompared it with ORC and the Kalina cycle, from the viewpoints of thermodynamics and

    thermo-economics. Whereas Zhi Zhang et al [51] introduced an integrated system of ammonia

    water KalinaRankine cycle (AWKRC) for power generation and heating & studied the

    performances of the AWKRC system in different seasons with corresponding cycle loops.

    2.2 OPTIMIZATION

    Optimization means the process of obtaining a favourable/ desirable condition. In case of

    thermodynamic cycles optimisation implies obtaining high performance by getting high work

    output with minimum heat input. This topic deals with optimization of the existing cycles as

    well as introduction of new cycles.

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    Fig. 2.2. System output net power vs. exhaust mass flow rate (kg/s)

    [Source:Donghong Wei et al [6]]

    Donghong Wei et al [6] presented system performance analysis and optimisation using HFC-

    245fa as the refrigerant. They did optimisation by maximising the usage of exhaust heat and

    decreasing degree of sub-cooling at condenser. They also said that when the ambient

    temperature is too high, the system efficiency decreases. The analysis reports are given

    in Fig.2.1.Whereas KonstantinosBraimakis et al [47] investigates the waste recovery potential

    of the ORC and some innovations such as the supercritical cycle and the use of binary zeotropic

    mixtures. They performed simulations for different temperature heat sources and identifiedoptimal operation mode and working fluids.

    Unlike these two both Sylvain Quoilin et al [13] did experimentation and used working

    fluid HCFC-123. The ORC model is built by interconnecting different sub-models: the heat

    exchanger models, a volumetric pump model and a scroll expander model. This model is finally

    used to investigate potential improvements of the prototype. Like SylvaibQuoilin et al [13]

    Vincent Lemort et al [14] also used scroll expander. They used ORC to recover energy from

    low grade sources. They did experiment and compared result with analysed results and then

    worked on improving the design of expander.

    Ricardo Vasquez Padilla et al [40] proposed a combined Rankine Goswami cycle (RGC) and

    conducted a thermodynamic analysis. The Goswami cycle, used as a bottoming cycle,uses ammoniawater mixture as the working fluid and produces power and refrigeration while

    power is the primary goal. Similarly GokmenDemirkaya et al [36] presented optimization of a

    combined power/cooling cycle as shown in Fig.2.2, also known as the Goswami cycle. In

    this multi-objective genetic algorithms (GAs) are used for Pareto approach optimization of the

    thermodynamic cycle. The important thermodynamic objectives that have been considered in

    this work are namely work output, cooling capacity, effective first law, and exergy efficiencies.

    Also Feng Xua et al [33] proposed a cycle which combines a Rankine cycle and an absorption

    refrigeration cycle. They have used ammonia-vapour mixture for the cycle. They did parametric

    analysis.

    http://www.sciencedirect.com/science/article/pii/S0196890406003347http://www.sciencedirect.com/science/article/pii/S0196890406003347http://www.sciencedirect.com/science/article/pii/S0196890406003347http://www.sciencedirect.com/science/article/pii/S0196890406003347
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    Fig. 2.3. (i) Schematic description of the combined power/cooling cycle.(ii) (a) Temperature-Entropy and (b) concentration-enthalpy

    [Source:Gokmen Denirkaya et al [36]]

    Sanjay Vijayaraghavan [37] did investigation on rankine cycle. They develop several

    expressions for the first law, second law and exergy efficiency definitions for the combined

    cycle based on existing definitions in the literature. They have used the generalised reduced

    gradient (GRG) method to perform the optimization whereas Huijuan Chen [35] presents a

    review of the organic Rankine cycle and supercritical Rankine cycle (shown in Fig. 2.4) for the

    conversion of low-grade heat into electrical power and selecting 35 working fluids. The paper

    discusses the types of working fluids, influence of latent heat, density and specific heat, and the

    effectiveness of superheating. They used analysis method.SirkoOgriseck [18] presents the

    integration of the Kalina cycle process in a combined heat and power plant for improvement of

    efficiency for using low grade energy and waste energy recovery. Umberto Desideri et al [25]

    did investigation on exploiting geothermal energy by using closed Rankine and Kalina cycles.

    In this paper three configurations of the Rankine cycle are examined and compared to

    conventional single and dual flash steam power plants.Yiji Lu et al [52] paper proposed an

    optimised resorption cogeneration with a stabilisation unit and effective mass and heat recovery

    to further improve the performance of the original resorption cogeneration first proposed by

    Liwei Wang et al.

    http://www.researchgate.net/publication/263614547_Multi-Objective_Optimization_of_a_Combined_Power_and_Cooling_Cycle_for_Low-Grade_and_Midgrade_Heat_Sourceshttp://www.researchgate.net/publication/263614547_Multi-Objective_Optimization_of_a_Combined_Power_and_Cooling_Cycle_for_Low-Grade_and_Midgrade_Heat_Sourceshttp://www.researchgate.net/publication/263614547_Multi-Objective_Optimization_of_a_Combined_Power_and_Cooling_Cycle_for_Low-Grade_and_Midgrade_Heat_Sourceshttp://www.researchgate.net/publication/263614547_Multi-Objective_Optimization_of_a_Combined_Power_and_Cooling_Cycle_for_Low-Grade_and_Midgrade_Heat_Sources
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    Fig. 2.4. Process of a CO2 supercritical Rankine cycle on T-s diagram (a-b-c-d-e-f-g)

    [Source:Huijuan Chen [35]]

    The following authors optimized the Kalina cycle using exergy analysis. G. Wall et al [26]

    applied energy utilisation method (A graphic method to describe the exergy losses in industrial

    processes, i.e. for improving the exergy use) and optimized the cycle accordingly (Fig. 2.5

    shows the energy utilisation diagram obtained.), while P.K. Nag et al [19] investigated to reduce

    the thermal irreversibility of Kalina cycle (One parameter i.e. mixture concentration at turbine

    inlet appears to have an optimum value with respect to second law efficiency). Effects of otherparameters on the exergy loss of each component have been studied.

    Fig. 2.5. Energy Utilization Diagram for the Kalina cycle

    [Source:G.Wall et al [26]]

    Nasruddin et al [31] did simulation to obtain the data of efficiency, energy and exergy that

    could be generated from the heat source. Both G. Tamma et al [42] and AfifAkelHasan et al

    http://www.sciencedirect.com/science/article/pii/S1364032110001863http://www.sciencedirect.com/science/article/pii/S1364032110001863http://www.sciencedirect.com/science/article/pii/S1364032110001863http://masters.dgtu.donetsk.ua/2006/eltf/bosov/library/kalina.pdfhttp://masters.dgtu.donetsk.ua/2006/eltf/bosov/library/kalina.pdfhttp://masters.dgtu.donetsk.ua/2006/eltf/bosov/library/kalina.pdfhttp://masters.dgtu.donetsk.ua/2006/eltf/bosov/library/kalina.pdfhttp://www.sciencedirect.com/science/article/pii/S1364032110001863
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    [43] worked on similar type of project. They investigated a combined thermal power andcooling cycle (i.e. Goswami Cycle) but G. Tamma et al [42] investigated a combined thermal

    power and cooling cycle both theoretically and experimentally whereas AfifAkelHasan et al

    [43] did research and performed second law efficiency and irreversibility experiment and

    optimised the cycles accordingly.

    A.L. Kalina et al [30] selected a cycle among several Kalina cycle variations that is particularly

    well suited as a bottoming cycle for utility combined cycle applications. Using an

    ammonia/water mixture as the working fluid and a condensing system based on absorption

    refrigeration principles the Kalina bottoming cycle outperforms a triple pressure steam cycle by

    16 percent.

    H.D. MadhawaHettiarachchi et al [2] presented a cost-effective optimum design criterion forOrganic Rankine power cycles utilizing low-temperature geothermal heat sources. The

    optimization method converges to a unique solution for specific values of evaporation and

    condensation temperatures and geothermal and cooling water velocities. The choice of working

    fluid also affects the objective function (Ratio of total area of heat exchanger to net power

    output) Huijuan Chen et al [41] proposed a supercritical Rankine cycle using zeotropic mixture

    working fluids for the conversion of low-grade heat into power and proposed that it creates a

    potential for reducing the irreversibilities and improving the system efficiency than

    conventional Rankine cycle.

    2.3 SELECTION OF FLUIDS

    Power generation has recently become popular. However, conventional electricity is not always

    economically feasible due to its capital cost and source of high priced fuels. Under this

    circumstance, use of non-conventional cycles becomes an important aspect to work upon to

    meet energy requirements. The efficiency of non-conventional cycles depends upon selection of

    fluids to a huge extent. The work done by number of authors on selection of fluid for ORC,

    Kalina and Goswami cycle is concluded.

    Feng Xua et al [38] did research on the thermodynamic properties of ammonia-water mixture

    for Goswami cycle by using Gibbs free energies and empirical equations and dew point

    temperature to calculate phase equilibrium. The methodology adopted by them is experimental

    and analytical. V. Maizza [11] investigated analytically the thermodynamic and physical

    properties of some unconventional fluids for use in ORC supplied by waste energy sources. Bo-

    Tau Liu et al [1] investigated analytically the performance of ORC subjected to the influence of

    various working fluids on the thermal efficiency and on the total heat-recovery efficiency. Tzu-

    Chen Hung [4] researched theoretically waste heat recovery of ORC using different dry fluids

    such as benzene (C6H6), toluene (C7H8),p-Xylene (C8H10), R-113 and R-123. From the

    conclusions,p-Xylene shows the highest efficiency while benzene shows the lowest and also

    shows that the irreversibility depends on the type of heat source. Fig .2.6. shows a typical T-s

    process diagram for the investigated ORC.

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    Fig. 2.6. A typical T-s process diagram for the investigated ORC

    [Source: Tzu-Chen Hung [4]]

    Two of the equation used by them is given below.

    In 2004, Huijuan Chen et al [42] analysed the supercritical Rankine cycle which uses a

    zeotropic mixture as working fluid for the conversion of low-grade heat, whereas UlliDrescher

    et al [3] paper presents an theoretical analysis of fluid selection for the ORC in biomass power

    and heat plants with the help of a software and it was found that the highest efficiencies are

    found within the family of alkyl benzenes.Yiping Dai et al [5] did a comparative study analytically of the effects of the thermodynamic

    parameters on the ORC for each working fluid. They optimized exergy efficiency as an

    objective function by means of the genetic algorithm whereas George Papadakis et al [8]

    proposed an innovative theoretical approach for fluid selection of Solar ORC. Thermodynamic

    and environmental properties of few fluids have been comparatively assessed. A. Schustera et al

    [10] presented an energetic and economic investigation of ORC applications by method of

    simulation. The favourable characteristics of ORC make them suitable for being integrated in

    applications like solar desalination with reverse osmosis system, waste heat recovery from

    biogas digestion plants. E.H. Wanga [16] presented the performance of different working fluids

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    operating in specific regions using a thermodynamic model. Nine different pure Organicworking fluids were selected according to their physical and chemical properties. He used

    method of simulation.Nishith B. Desai et al [17] presented that an ORC offers advantages over

    conventional Rankine cycle with water as the working medium, as ORC generates shaft-

    work from low to medium temperature heat sources with higher thermodynamic efficiency. The

    dry and the isentropic fluids are most preferred working fluid for the ORC. A. Benato et al [45]

    investigated the critical dynamic events causing thermo-chemical decomposition of the working

    fluid in ORC power systems.Charles H. Marston [20] did parametric analysis of Kalina Cycle.

    Investigation on water ammonia mixture was done using the enthalpy-temperature curve of a

    hot gas heat source. Computer models have been used to optimize a simplified form of the

    cycle. He used simulation method whereas Xinxin Zhang [23] proposed and analysed researchon the Kalina cycle by analytical means. The three systems used by them is shown in Fig. 2.7.

    Fig. 2.7. Kalina Cycle Systems using ammonia water mixture

    [Source: XinxinZhang [23]]

    E.D. Rogdakis [34] proposed a high efficiency NH3H2O absorption power cycle. The newcycle employed a mixture of H2O and NH3 as the working fluid and used an absorption process

    similar to that of absorptionrefrigerators. The new cycle was 20% more efficient than that of the

    Rankine cycle if the boiling temperature is high, while for low boiling temperatures, the

    superiority of the proposed cycle was much more pronounced. Their methodology was

    analytical. Mounir B. Ibrahim [28] proposed Kalina cycle application for power generation,

    investigated a multi-component(NH3/H2O) Kalina cycle that utilized the exhaust from a gas

    turbine. The figure below shows diagram of components used in this work. The multi-

    component working fluid cycle proved 1020% more efficient than a Rankine cycle with the

    same boundary conditions.

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    Table 2.1. Fluids and cycles used by different authors to do their research.Authors Fluid used Cycle

    Feng Xua et al [38] Ammonia-water mixture Goswami cycle

    . V. Maizza [11] Unconventional Fluids ORC

    Bo-Tau Liu et al [1] water, ammonia, and ethanol ORC

    Tzu-Chen Hung [4] Benzene (C6H6), Toluene (C7H8),p-

    Xylene (C8H10), R-113 and R-123

    ORC

    Huijuan Chen et al

    [42]

    Zeotropic Mixture Supercritical

    Rankine cycle

    UlliDrescher et al

    [3]

    Alkyl Benzenes ORC

    Yiping Dai et al [5] R236EA ORC

    George Papadakis

    et al [8]

    R134a, R152a, R600a, R600 and R290 ORC

    . A. Schustera et al

    [10]

    R11,R113,R114,Toulene and fluorinol ORC

    . E.H. Wanga [16] R11, R141b, R113 and R123, ORC

    Nishith B. Desai et

    al [17]

    16 different fluids ORC

    Benato et al [45] Ammonia-water mixture ORCCharles H. Marston

    [20]

    Ammonia-water mixture Kalina cycle

    Xinxin Zhang [23] Ammonia-water mixture Kalina cycle

    E.D. Rogdakis [34] Ammonia-water mixture Kalina cycle

    . Mounir B. Ibrahim

    [28]

    Ammonia-water mixture Kalina cycle

    2.4 LOW GRADE HEAT

    In the majority of energy applications, energy is required in multiple forms. These energy forms

    typically include some combination of heating, ventilation, mechanical energy and electric

    power. Often these forms of energy are produced by a heat engine. A heat engine can neverhave perfect efficiency, according to the second law of thermodynamics; therefore a heat engine

    will always produce a surplus of low-temperature heat. This is commonly known as low grade

    heat. Renewable energy sources, such as solar thermal, geothermal and vast amounts ofindustrial waste heat or low grade heat are potentially promising energy sources capable, in

    part, to meet the world electricity demand. The temperature of the low grade heat stream is the

    most important parameter, as the effective use of the residual heat or the efficiency of energy

    recovery from the low grade heat sources will mainly depend on the temperature difference

    between the source and a suitable sink. In this topic, development of other thermodynamics

    cycles to convert the low-grade heat into electrical power is implemented. Organic Rankine

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    102 M.N.Karimi, A. Dutta, A. Kaushik, H. Bansal, S. Z. Haque

    cycle, Goswami cycle and Kalina cycle are the major cycles that have been developed for theconversion of low grade of heat into electricity

    Table 2.2. Temperature range of different types of low grade sources

    Low Grade Heat Sources Temperature Range

    Solar thermal 70C-800CGeothermal 149C-370C

    Industrial waste thermal 80C-400C

    J. Larjola et al [9] deals with ORC-design experimentally and used a high-speed oil free turbo

    generator- feed pump. The use of high speed turbo generator made the ORC small, simple,

    hermetic and reduced significantly the maintenance expenses.D. Yogi Goswami et al [39]

    experimentally worked on a combined thermal power and cooling cycle (i.e. Goswami cycle)

    which was ideally suited for solar thermal power (low grade energy) using low cost

    concentrating collectors. H.D. MadhawaHettiarachchi et al [22] used the Kalina cycle system

    11 (KCS-11) whereas OguzArslan [27] and [29] did research using the Kalina cycle system-34

    (KCS-34). The former used experimentally the exergetic and life cycle cost concepts whereas

    the latter used an artificial neural network (ANN) (a new tool used to make a decision for the

    optimum working conditions of the processes within the expertise).

    Ricardo Vasquez Padilla et al [40] said that improving the efficiency of a combined RGC plays

    a fundamental role in reducing the cost of solar power plants whereas P.A. Lolos et al [21] used

    a Kalina cycle with low-temperature heat sources to produce power. S. C. Kaushik et al [32]

    used a computer simulation of a Kalina cycle coupled with a coal fired steam power plant with

    the aim of examining the possibility of exploiting low-temperature heat of exhaust gases for

    conversion into electricity.

    Recently Masatake Sato et al [52] used a binary power generation technology using low

    temperature heat source. The program included technical development associated with power

    grid coordination and technical development for determining the effects of the hot springs.

    Duen Sheng Lee et al [47] proposed an innovative approach for collecting the solar thermal

    energy from the concept of solar chimneys (Fig-2) for electricity generation via ORCs.

    Francesco Calise et al [49] did work on a dynamic simulation model of a novel prototype of a 6KW solar power plant over a span of year and presented it for different seasons.

    3.0 CONCLUSION:

    In this review paper, various cycles have been compared so as to find a best cycle to convert

    various low temperature heat sources into electrical power in various conditions using different

    methodologies used in research.This paper also deals with the optimisation of various cycles by

    changing various parameters and finding the best possible set of parameters under which it must

    operate; also some new cycles have been introduced resulting in a more efficient power

    conversion. In the area selection of fluids, 16 papers have been reviewed and varieties of fluids

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    are used to optimise the three cycles(Kalina cycle,Goswami cycle And ORC) by varyingnumber of parameters. In the topic of low grade heat, analysis of different thermodynamic cycle

    has been done and thereby implemented to produce work (electricity) from low grade heat

    source.

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