Mass Flow Rate Of Fluid Research Articles

A New Homogeneous Non-Equilibrium Model to Compute Vapor-Liquid Two-Phase Critical Pressure Ratios of Multicomponent Hydrocarbon Mixtures

The critical pressure ratio (ηc) is an essential parameter for computing the vapor-liquid two-phase critical pressure and mass flow rate of multicomponent hydrocarbon mixtures flowing through valves and leakage orifices. The Homogeneous Non-Equilibrium Diener-Schmidt (HNE-DS) model widely used to calculate ηc assumes that the fluid's volume linearly changes with the pressure (using the Clausius-Clapeyron equation), which is not suitable for multicomponent gas mixtures. In this paper, a new Homogeneous Non-Equilibrium (new-HNE) model is proposed to calculate ηc of gas mixtures. Firstly, a new critical flow compressibility factor (ωc) is developed from its thermodynamic definition and the Peng-Robinson equation of state (EOS), overcoming the inherent limitations of the Clausius-Clapeyron equation. Then, ηc is correlated to the newly derived ωc by fitting experimental data at various pressures and gas mass fractions of both single-component and multicomponent gas mixtures, yielding the new HNE-DS model. Results show that, for the water-steam and air-water two-phase flow, the average relative deviations (ARD) between the calculated critical pressure ratios and experimental values are equal to 2.8% and 4.93%, respectively, which represents a significant improvement in comparison with the original HNE-DS model. Moreover, this new model is extended to the applications of Liquefied natural gas (LNG)/liquefied petroleum gas (LPG) fluids, and will further contribute to the calculation of the leakage mass flow rate of fluid flowing through the orifices/valves.

Experimental and numerical study of a falling film heat exchanger used in a vapour absorption refrigeration system

Falling film evaporators have found applications in a wide range of industries, varying from chemical industries, petroleum refinery, desalination and food process industries. These heat exchangers are preferred mainly because of high heat exchange rates with low temperature difference between the heat exchange fluids at low film fluid flow rates with low evaporation temperature. This study is focused on numerical and experimental investigation of vapour generator (falling film heat exchanger) of a vapour absorption refrigeration (VAR) system. The influence of key operating parameters like mass flow rate of fluid, inlet temperature and the concentration of the thermic fluid as well as the coolant, are experimentally studied and are compared with the numerical results. The deviation between the experimental and numerical results was found to be 8.72%, with a lesser deviation at lower temperatures. The minimum percentage error is 2.15%, for a thermic fluid temperature at 50 °C. There is a stronger agreement in the results for lower values of the glycol water mixture inlet temperature, than at high temperatures. A maximum of 1000 W/m2 heat is transferred to the aqua-ammonia with ammonia concentration of 0.6 by volume is observed for thermic fluid inlet temperatures of 80 °C. The effect of various operating parameters were numerically studied and interpreted. The results obtained were in correlation with the concepts of heat transfer.

Performance Analysis of Solar Organic Rankine Cycle with Stable Output Using Cyclopentane/Cyclohexane Mixtures▴

AbstractKeeping output stable is necessary for solar organic rankine cycle (SORC) considering variable solar irradiation conditions. In this study, zeotropic mixtures are introduced into SORC with stable output. Evaporation pressure and turbine inlet temperature are optimized with the overall system efficiency as optimization objective. Comparisons are drawn between the basic SORC and regenerative SORC. The influences of zeotropic mixture composition on the overall system efficiency, ORC efficiency, heat source outlet temperature, mass flow rate of heat source and working fluids and temperature rise of internal heat exchanger (IHE) are analyzed. The results show that zeotropic mixtures can slightly increase the overall system efficiency of the basic SORC system compared with the optimal pure working fluid system, but for the regenerative SORC system, the optimal overall system efficiency is higher when pure cyclohexane is used. When cyclopentane mole fraction is 0.4, the overall system efficiency of the basic SORC system reaches maximal value of 16.08%, which is 0.12% higher than for the optimal pure working fluids system, relatively. Under the optimum conditions, the optimal overall system efficiency of the regenerative SORC system is 52.11% higher than that of the basic SORC system.

Preliminary Investigations of an Opposed Rotary Piston Compressor for the Air Feeding of a Polymer Electrolyte Membrane Fuel Cell System

Automotive polymer electrolyte membrane fuel cell systems are attracting much attention, driven by the requirements of low automotive exhaust emissions and energy consumption. A polymer electrolyte membrane fuel cell system provides opportunities for the developments in different types of air compressors. This paper proposed an opposed rotary piston compressor, which had the merits of more compact structures, less movement components, and a high pressure ratio, meeting the requirements of polymer electrolyte membrane fuel cell systems. Preliminary performance evaluations of the opposed rotary piston compressor were conducted under various scenarios. This will make a foundation for optimizations of outlet pipe layouts of the compressor. A three-dimensional numerical simulation approach was used; further, in-cylinder pressure evolutions, fluid mass flow rates, and P–V diagrams were analyzed. It indicated that the cyclic period of the opposed rotary piston compressor was half of reciprocating piston compressors. The specific mass flow rate of the compressor is in the range of 0.094–0.113 kg·(s·L)−1 for the given scenarios. Outlet ports 1 and 2 dominated the mass flow in the discharge process under scenarios 1, 3, and 4. In-cylinder pressure profiles show multipeaks for all of these scenarios. In-cylinder pressure increased rapidly in the compression process and part of the discharge process, which led to high energy consumption and low adiabatic efficiency. The maximum adiabatic efficiency is approximately 43.96% among the given scenarios.

Heat‐in‐leak and longitudinal wall heat conduction influence on three‐fluid cross‐flow heat exchanger performance

AbstractThe combined effect of the longitudinal wall heat conduction in the partitioning wall and ambient heat‐in‐leak (HL) from the surrounding to the heat exchanger is a serious factor affecting the performance of a multifluid heat exchanger. The performance of a three‐fluid cross‐cocurrent flow heat exchanger under such circumstances is investigated in this paper. The governing equations for three‐fluids and two separating walls are formulated on the basis of energy balance equations and solved using the finite element method (FEM). Nondimensional parameters (C1,2, C3,2, R1, R3, Ht, Hb, , , , and the number of transfer units [NTU]) are generated and used for the investigation. Effectiveness‐number of transfer plots method is used to analyze the combined effect of wall heat conduction and HL from the surrounding. The combined effect reduces the hot fluid effectiveness significantly for all the parameters considered. The effect of HL alone is predominant as compared with longitudinal wall conduction alone. However, the negligence of the above two parameters in the thermal design of the heat exchanger contributes to a significant loss in hot fluid effectiveness. For a balanced mass flow rate of hot and cold fluid, the drop in the hot fluid effectiveness is found to be 37% approximately (with C3,2 = 0.5, R1 = R3 = 1, Ht = Hb = 0.05, and = = 0.025 at NTU = 10). The results present insight and important considerations involved in the design of such heat exchangers. Also with the application of the FEM, for any number of elements, the stiffness matrix can be generated by writing a program and the exit temperatures are calculated very easily.

Performance Analysis of Heat Transfer Parameters in Shell and Tube Heat Exchanger with Circumferential Turbulator

Performance of heat exchanger is evaluated by the value of heat transfer coefficients, Reynolds number, Nusselt number, temperature distribution along the length, residence time and pressure drop. Improving these parameters for better performance is the main focus in designing the heat exchanger. In that view, helical coil gives more turbulence to the fluid flowing through it that leads to improved tube side heat transfer coefficient. For increasing the turbulence in cold flow, turbulators can be used in the circumferential area between helical coil and shell. In this work, heat transfer rate of shell and helical coil heat exchanger is improved by using circumferential turbulators. For the same mass flow rate of cold fluid different hot fluid mass flow rates (0.03 kg/s, 0.06 kg/s, 0.09 kg/s and 0.12 kg/s) were fixed for taking readings and the improvement is obtained by calculation of performance parameters. The temperature distribution along the length of the heat exchanger is plotted for different flow rates. Results show that, increasing the mass flow rate of cold fluid above the mass flow rate of hot fluid decreases the performance.

Determination of thermal performance of hydronic radiant panel heaters for different fluid flow rates, fluid inlet temperatures and room temperatures

An experimental study of a commercially manufactured ceiling type hydronic radiant heating system has been performed in a test room, under controlled temperature conditions. One of the goals was to investigate how the radiant heater, under various operating conditions, affects the temperature distribution inside an occupied room. Another goal was to study the thermal performance of the radiant heating panel for different fluid inlet temperatures, fluid mass flow rates and test room temperatures. In addition, the temperature distribution on top of a surface placed below the heater, representing an actual application, was investigated. From the relevant literature, it was concluded that insufficient knowledge exists about these characteristics. The working fluid was water, and fluid inlet temperatures between 45 °C and 85 °C and mass flow rates of 97 kg/h and 174 kg/h were analyzed. The results showed that an almost linear increase in heat output arises, with the increase in the inlet water temperature. For lower inlet temperatures the heat output is moderately higher for a mass flow rate of $${\dot{\text{m}}}$$ = 97 kg/h. The fraction of radiation heat transfer to the total heat transfer increases with decreasing water inlet temperature. It was also observed that, a relatively uniform temperature distribution could be obtained on the plate below the radiant panel. Furthermore, lower vertical temperature differences can be obtained inside the test room, for low water inlet temperature conditions. The obtained results of this study, could give information to manufacturers and building engineers, on the appropriate use and regulation of hydronic radiant systems.

Experimental study of comparison in performance of heat exchanger with and without silicon dioxide nano particle used in cold fluid

In this experimental study deals about the comparison in between performance of heat exchanger with and without Silicon dioxide nano particle used in cold fluid. The common counter flow heat exchanger setup created with both hot and cold fluid as water. Hot fluid is maintained at the temperature of 170 °C by using electric heater. Cold fluid is in 30 °C as inlet temperature. There are individual temperature measuring thermocouples used in desired places of the experimental setup. There are four different mass flow rate considered for the cold fluid but the mass flow rate of hot fluid maintained as constant. The outlet temperatures of both hot fluid and cold fluid, heat transferred rate, effectiveness were measured and calculated experimentally for with and without Silicon dioxide nano particles used in cold fluid. These values were compared to identify the greatest values of experimental conditions.

CFD Simulation of a Temperature Control System for Galvanizing Line of Metal Band Based on Jet Cooling Heat Transfer

The work focuses on the development of a thermo-fluid dynamic simulation model of a section of close cooling, called a jet cooler, inserted in the galvanizing line of metal band production. Two models of increasing accuracy have been tested and calibrated by experimental data. Special attention to turbulence modeling and boundary conditions has been given. A literature survey was focused on the jet impingement process (the reference heat transfer mechanism for the system component) and on available correlations to predict the heat exchange coefficient. The numerical simulation of jet impingement has been applied to a module of an actual industrial cooler for steel band production. The operation of the jet cooler was simulated in real operating conditions to get a detailed insight into the jet impingement mechanism in order to optimize the heat transfer and reduce, as far as possible, the cooling fluid mass flow rate. The comparison of heat transfer correlations, used in industrial preliminary design, with detailed CFD results is discussed.

A critique of effectiveness concept for heat exchangers; theoretical-experimental study

In this study attempts are made to clarify some hidden features of effectiveness concept (the ratio of actual heat transfer to maximum possible heat transfer) of heat exchangers and provide a critique viewpoint and comprehensive description about that. It is shown in present paper that the effectiveness parameter requires much more attention when it is used in fluid-flow parametric or sensitivity studies of heat exchangers and lack of consideration of its hidden features may lead to incorrect or imperfect decision-makings on curve behavior of effectiveness. Indeed, it is shown that the curve trend of effectiveness against the Reynolds number of one side of heat exchanger can be ascending, descending, or ascending-descending depending on the mass flow rate (Re number) of the other side fluid. Although this critique viewpoint is not considered as a weakness of the effectiveness definition for heat exchangers, inattention may lead to wrong or imperfect inferences in sensitivity analysis of effectiveness parameter. Moreover, it is not logical to provide empirical correlation for effectiveness against flow parameters without the consideration of described features of effectiveness in this study. In order to support the described viewpoint some experiments are performed on double helical tube heat exchanger to evaluate the related thermal parameters and describe the mentioned features of effectiveness statistically. However, the provided analysis is valid for any other type heat exchanger as well.

Energy performance of seasonal thermal energy storage in underground backfilled stopes of coal mines

Thermal storage of the energy is essential for district heating systems to mitigate intermittency related issues. The extensive cavities created after extraction of ores/coal in mines could provide a unique opportunity for storage and extraction of thermal energy. This paper shows that underground backfilled stopes present a viable potential for being retrofitted to thermal energy storage batteries. The present study evaluates the energy performance of thermal energy storage in underground backfilled stopes by installing heat exchange tubes prior to backfill placement. A numerical fluid mechanics and heat transfer model for backfill stopes was developed in Fluent to investigate the heat exchange inside the tubes as well as the heat transfer happening within the backfill during the heat storage and extraction process. The proposed model is compared against an analytical heat transfer model to determine its reliability and accuracy. The results obtained from the validated numerical model showed that energy storage system in a typical underground backfilled stope of coal mines can provide about 23 GWh of thermal energy storage capacity with an average recovery rate of 60% during extraction cycles. Accordingly, several sensitivity analyses were conducted to define the optimum center-to-center distance for the pipe installation to attain the best system performance. Through a series of parametric studies, it was found that thermal conductivity of backfill and rock, circulating fluid mass flow rate, initial rock temperature and thermal saturation time constitute the most significant influencing parameters on energy storage performance of such applications. It can be concluded that thermal energy storage systems in backfilled stopes are relatively more techno-economically feasible, compared to conventional borehole energy storage systems, in terms of their significantly lower drilling/installation costs and higher hosting temperature.

Experimental study of the solar water heater integrated with shell and finned tube latent heat storage system

Abstract In this work, a new design of shell and finned tube latent heat storage system was designed, constructed and tested when it was integrated with the flat plate solar water heater. This design not only provides large heat transfer area between the storage material and the heat transfer fluid, but also it overcomes the problem of low thermal conductivity of paraffin wax (PW) by dividing it into tens of thin slices. Three configurations of storage techniques were proposed; where water, PW as phase change material (PCM) and both water and PW were used as thermal storage materials. The proposed systems were tested at different mass flow rates of heat transfer fluid (0.08–0.16 kg/s). The experimental results showed that the highest daily efficiency of 65% was achieved when the configuration that combines the PCM and water storage tank was used. Moreover, this configuration was capable of providing hot water of temperature ranging from 50 to 60.4 °C through 24 h/day. The results of this configuration showed also that the released energy from PW constitutes 52% of the total stored energy; while the remaining energy of 48% was considered backup stored energy that may help in any sudden thermal loads during night.

Increased Power Generation due to Exothermic Water Exsolution in CO2 Plume Geothermal (CPG) Power Plants

A direct CO2-Plume Geothermal (CPG) system is a novel technology that uses captured and geologically stored CO2 as the subsurface working fluid in sedimentary basin reservoirs to extract geothermal energy. In such a CPG system, the CO2 that enters the production well is likely saturated with H2O from the geothermal reservoir. However, direct CPG models thus far have only considered energy production via pure (i.e. dry) CO2 in the production well and its direct conversion in power generation equipment. Therefore, we analyze here, how the wellhead fluid pressure, temperature, liquid water fraction, and the resultant CPG turbine power output are impacted by the production of CO2 saturated with H2O for reservoir depths ranging from 2.5 km to 5.0 km and geothermal temperature gradients between 20 °C/km and 50 °C/km. We demonstrate that the H2O in solution is exothermically exsolved in the vertical well, increasing the fluid temperature relative to dry CO2, resulting in the production of liquid H2O at the wellhead. The increased wellhead fluid temperature increases the turbine power output on average by 15% to 25% and up to a maximum of 41%, when the water enthalpy of exsolution is considered and the water is (conservatively) removed before the turbine, which decreases the fluid mass flow rate through the turbine and thus power output. We show that the enthalpy of exsolution and the CO2-H2O solution density are fundamental components in the calculation of CPG power generation and thus should not be neglected or substituted with the properties of dry CO2.

FEA Analysis of Double Tube Heat Exchanger on Variable Baffle Pitch for Optimizing Thermal Efficiency

The main objective of this work is to compare different configurations of helical baffles in the cold fluid side of a double tube heat exchanger. For this analysis double pipe heat exchangers are divided into three different domains such as two fluid domains hot fluid in the inner tube and cold fluid in the outer pipe and a solid domain as helical baffles on inner tube of hot fluid. The hot water flows inside the heat exchanger tube, while the cold fluid flows in the outer side in the direction of counter flow. Mass flow rate cold fluid was varied from 0.1 kg/s to 0.3 kg/s while the flow rate in the inner tube i.e. hot water was kept constant at 0.1 kg/s. the inlet temperature of hot fluid taken as 40oC while Cold fluid inlet temperature taken as 15oC. The fluent software is used to calculate the fluid flow and heat transfer in the computational domains. The governing equations are iteratively solved by the finite volume formulation with the SIMPLE algorithm. Results show that that the maximum temperature drop of 10.9 oC for hot fluid and the maximum temperature rise of 11.9 oC for cold fluid are observed at 0.3 kg/sec mass flow rate for double pipe heat exchanger with double helical baffles. It has been also observed that the heat transfer coefficient increasing with the increasing in the mass flow rate of cold fluid. The overall heat transfer coefficients differ significantly by 20.4 % at same mass flow rate, because the considerable difference between heat transfer surface area on the inner and outer side of the tube resulting in a prominent thermal enhancement of the cold fluid.

Numerical comparison of two operating modes of thermal energy storage tank for compression heat storage in adiabatic compressed air energy storage

• Thermal performance of multi-PCM energy storage tank is numerically analysed. • A thermodynamic comparison of two charging configurations is implemented. • A parametric study of PCM packing height is performed. • Results indicate that correct arrangement of PCM packing height is critical. • Preheating air after compression with part of excess electricity improves performance Two different charging modes of a thermal energy storage tank (TEST) system employing multi-phase change material for compression heat storage in an adiabatic compressed air energy storage process was simulated to compare their performance. The modes are mod1 with higher mass flow rate and low temperature and mod2 with higher temperature and low mass flow rate of heat transfer fluid respectively. A mathematical formulation of the energy interactions in the HTF and the PCM filling the TEST was discretized using implicit finite difference technique and solved in Matlab using a matrix inversion technique. The developed model showed good agreement with experimental data of temperature profile of heat transfer fluid during the charging mode. The two modes were compared using metrics such as charging rate, discharging rate, charging efficiency, discharging efficiency, charging and discharging exergy efficiency, and overall exergy and energy efficiency. It was found that mod2 performs better than mod1 in both the charging and discharging cycle. The round trip efficiency of mod1 ranges from 0.87 to 0.77 with a mean value of 0.76 whereas that for mod2 ranged from 0.97 to 0.79 with an average of 0.78. Moreover, the overall exergy efficiency ranges from a peak value of 0.48 and 0.55 to the least value of 0.33 and 0.44 in mod1 and mod2 respectively, corresponding to average efficiencies of 0.45 and 0.51 in mod1 and mod2 respectively. The numerical results show that using some part of the excess electricity of wind turbine to preheat air after compression is a promising solution to improve performance of A-CAES plants.

Energy analysis using carbon and metallic oxides-based nanomaterials inside a solar collector

The effectiveness of a flat-plate solar collector was studied by using SiO2, Al2O3, Graphene, and graphene nanoplatelets nanofluids with distilled water as the working fluids. The energy efficiency was theoretically compared using MATLAB programming. The prepared carbon and metallic oxides nanomaterials were structurally and morphologically characterized via field emission scanning electron microscope. The study was conducted under different operating conditions such as different volume fractions (0.25%, 0.5%, 0.75% and 1%), fluid mass flow rate (0.0085, 0.017, and 0.0255 kg/s), input temperatures (30, 40, and 50 °C), and solar irradiance (500, 750, and 1000 W/m2). Nanofluids showed better thermophysical properties compared to standard working fluids. With the addition of the nanofluids SiO2, Al2O3, Gr and GNPs to the FPSC the highest efficiency of 64.45%, 67.03%, 72.45%, and 76.56% respectively was reached. The results suggested that nanofluids made from carbon nanostructures and metallic oxides can be used in solar collectors to increase the parameters of heat absorbed/loss compared to water only usage.

Novel dimension scaling for optimal mass flow rate estimation in low temperature flat plate solar collector based on thermal performance parameters

Uncomplicated configuration, efficient collection of incident solar radiation and less frequent maintenance issues compared to the other prevalent alternatives enable the flat plate solar collectors to remain relevant in the present age of continuously evolving cutting-edge technologies. However, the quest for energy-efficient and sustainable solutions necessitates resizing of the flat plate collectors to achieve enhanced efficiency. Detailed performance analysis of the collector requires a prohibitively higher number of experimental trials and computationally expensive numerical models. Hence, in this study, a simplified energy equations-based dynamic model is used to develop working relationships for calculating the collector dimensions and the optimum heat transfer fluid (HTF) mass flow rate for achieving a predefined thermal efficiency. The developed formulae can predict the geometrical and operating parameters very accurately, with maximum deviation in estimating the collector channel dimensions being 12.5%. Hence, the formulae can be used as an initial guideline for the design of the collector. The computational results for the geometrical configuration corresponding to an average DNI, calculated from actual solar radiation data, indicate that to achieve a fixed temperature and a collector efficiency, the required HTF mass flow rate increases with increasing level of solar radiation.

Comparison of different dynamic thermal performance prediction models for the flat-plate solar collector with a new V-corrugated absorber

The flat-plate solar collector with a V-corrugated absorber (VFPC) has been shown to be able to improve the steady-state optical and thermal efficiency by up to 15.8% and 10.7%, respectively. To predict the dynamic thermal performance of VFPC, the Quasi-Dynamic Test Model (QDTM), Transfer Function Model (TFM) and Dynamic Heat Transfer Model (DHTM) are compared in this study. The coefficients of the dynamic test models (including QDTM and TFM) are obtained by the regression of experimental data, and the DHTM is presented based on the analysis of detailed heat transfer processes inside collector. Tested data under four kinds of test conditions is selected to identify parameters in the dynamic test models, and tested data under one more test condition with varied solar irradiances, fluid inlet temperatures and mass flow rates is selected to validate the prediction accuracy of the three models. For the short-term prediction results by QDTM/TFM/DHTM, the maximum absolute value of relative error of fluid outlet temperature Tfo and rate of useful heat gain Qu are 6.8%/5.5%/3.0% and 64.9%/43.8%/29.6% respectively. While for the long-term prediction results with the operation period of about 1 h, the averaged absolute value of relative error of useful heat gain Qu.o are 1.4%/1.0%/1.2% and the averaged absolute error of averaged thermal efficiency ηt.o are 1.1%/0.8%/0.9%. Results indicate that the DHTM has the most potential to predict the short-term thermal characteristic of VFPC accurately, followed by the TFM and QDTM, while the three kinds of models have the similar accuracy level to predict the long-term thermal characteristic of VFPC.

Simulations for L-STAR experimental gas-cooled system / CFD-Nachrechnung von L-STAR-Versuchen zur Wärmeübertragung von turbulenten Gasströmungen

Abstract Turbulent heat transfer through gas-cooled systems is a key factor for the improvements of the gas-cooled fast reactors. Within the FP7 European projects GoFastR (European Gas Cooled Fast Reactor) [1] and THINS (Thermal-hydraulics of Innovative Nuclear Systems) [2], numerical tools for the simulation of the thermal-hydraulics of next generation reactor systems were developed, applied and validated for innovative coolants. One of their objects was the L-STAR (Luft - STab, Abstandshalter, Rauheiten) facility, which has been designed and erected at the Karlsruhe Institute of Technology to study turbulent flow behaviour and its heat transfer enhancement characteristics in gas-cooled annular channels under a wide range of conditions. The test section consists of a hexagonal cross-section channel with an inner electrical rod heater placed coaxially. This design represents the flow domain around a single fuel rod in a future GFR. In this paper experimental results of the fluid flow with uniform heat release conditions for the smooth heater rod are considered. Design of the facility allows using various values of heating power and fluid mass flow rates depending on the chosen scenario. The purpose of this study is to create CFD models for the L-STAR facility, which are capable of reproducing the results of reference measurements. The other aim is to find an applicable turbulence model for the GFR relevant cases. Steady-state simulations are performed for selected cases. We also present mesh, structural element and turbulence model sensitivity studies during this work. With these model results it becomes possible to validate our CFD models to be applicable for the ALLEGRO gas-cooled reactor fuel assemblies.

Selection of low temperature thermal power cycles

In today?s world, we are facing the problem of fossil fuel depletion along with its cost continuously increasing. Also, it is getting difficult to live in a pollution free environment. Solar energy is one of the most abundantly and freely available form of energy. Out of the various ways to harness solar energy, solar thermal energy is the most efficient as compared to photovoltaic technology. There are various cycles to convert the solar thermal energy to mechanical work, but Kalina cycle is one of the best candidates for high efficiency considerations. Therefore, the authors have proposed a novel Kalina cycle having the double separator arrangements to increase the amount of ammonia vapors at the inlet of turbine, and hence have tried to minimize the pumping power for double separator Kalina cycle by reducing the fraction of gas/vapors through it. Here, in this paper we have tried to compare ORC, Brayton cycle, and double separator Kalina cycle for low temperature heat extraction from parabolic trough collectors having arc-circular plug with slits. The effect of different operating conditions, like the number of parabolic trough collectors, mass-flow rate of fluids in different cycles, pressure difference in turbine are analyzed. The effect of these different operating conditions on different parameters like net work done, heat lost by condenser, thermal efficiency and installation cost per unit kW for double separator Kalina cycle, ORC, and Brayton cycle are studied.