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KAFE ZALI SUP TULANG

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Roman Reyes
Roman Reyes

Learn How to Use ABSIM for Different Cycle Configurations and Working Fluids


- Benefits of using ABSIM for absorption system simulation H2: How to use ABSIM for different absorption systems - Closed and open absorption cycles- Vapor compression and other thermodynamic cycles- Examples of cycle configurations and working fluids H2: How to download and install ABSIM - Requirements and compatibility- Download link and instructions- Activation and license H2: How to run ABSIM and customize your simulation - User interface and options- Input data and output results- Tips and tricks for better simulation H2: How to optimize your absorption system with ABSIM - Global optimization feature- Genetic algorithm and fitness function- Optimization examples and results H2: Conclusion and FAQs - Summary of main points- FAQs Article with HTML formatting: What is ABSIM and why you need it




If you are interested in designing, evaluating, or optimizing absorption systems, you need a reliable and flexible simulation tool that can handle different cycle configurations and working fluids. That's where ABSIM comes in.




absim absorption simulation download zip


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ABSIM (an acronym for ABsorption SIMulation) is a computer code for simulation of absorption systems in flexible and modular form. It may be applied to closed and/or open absorption cycles operating at steady state, as well as to vapor compression and other thermodynamic cycles.


ABSIM has many features that make it a powerful and user-friendly tool for absorption system simulation, such as:


  • It has a modular structure that allows you to compose almost any absorption cycle of interest by linking together different units/components, such as absorber, condenser, evaporator, desorber, heat exchanger, pump, valve, etc.



  • It has a large database of thermodynamic properties of 31 absorption fluids, including common ones like water-lithium bromide, ammonia-water, water-carbon dioxide, etc., as well as novel ones like ionic liquids, organic mixtures, etc.



  • It uses a hybrid solver that combines NewtonRaphson and steepest descent methods to solve the governing equations for the entire cycle simultaneously. It also has an algorithm that automates the initial guess selection for the solver, improving reliability and reducing manual user work.



  • It has a global optimization feature that uses a genetic algorithm to find the optimal values of selected parameters that maximize or minimize a user-defined fitness function. This can be used to optimize the performance, cost, or environmental impact of the absorption system.



The benefits of using ABSIM for absorption system simulation are:


  • You can simulate a wide range of absorption systems with different cycle configurations and working fluids, without having to rewrite major parts of the code or program the iterative sequence.



  • You can evaluate the performance, energy consumption, heat transfer, mass flow rates, pressures, temperatures, concentrations, etc. of the absorption system under different operating conditions.



  • You can compare different absorption systems or variations of the same system to find the best solution for your application.



  • You can optimize your absorption system by finding the optimal values of parameters such as heat source temperature, heat sink temperature, solution concentration, flow rate, heat exchanger area, etc.



How to use ABSIM for different absorption systems




ABSIM can be used to simulate different types of absorption systems depending on the cycle configuration and the working fluid. Here are some examples:


Closed and open absorption cycles




A closed absorption cycle is one where the working fluid circulates in a closed loop without any external mass exchange. An example is the single-effect water-lithium bromide cycle shown in Fig. 1. In this cycle, water vapor is absorbed by lithium bromide solution in the absorber (A), releasing heat to a cooling water stream. The diluted solution is then pumped (P) to a higher pressure and heated by a hot water stream in the generator (G), where water vapor is desorbed from the solution. The concentrated solution returns to the absorber through a heat exchanger (HX) where it is pre-cooled by the diluted solution. The desorbed water vapor flows through a valve (V) to a lower pressure and condenses in the condenser (C), releasing heat to another cooling water stream. The condensed water then evaporates in the evaporator (E), absorbing heat from a chilled water stream that provides cooling effect.


Fig. 1: Single-effect water-lithium bromide cycle


An open absorption cycle is one where there is mass exchange between the working fluid and an external fluid. An example is the ammonia-water air conditioning cycle shown in Fig. 2. In this cycle, ammonia vapor is absorbed by water in the absorber (A), releasing heat to a cooling air stream. The diluted solution is then pumped (P) to a higher pressure and heated by an external heat source in the generator (G), where ammonia vapor is desorbed from the solution. The concentrated solution returns to the absorber through an expansion valve (V). The desorbed ammonia vapor flows through a rectifier (R) where it is purified from any residual water vapor. The pure ammonia vapor then condenses in the condenser (C), releasing heat to another cooling air stream. The condensed ammonia then evaporates in the evaporator (E), absorbing heat from an air stream that provides cooling effect. The evaporated ammonia then mixes with an external air stream in a mixer (M) before entering the absorber.


Fig. 2: Ammonia-water air conditioning cycle


Vapor compression and other thermodynamic cycles




ABSIM can also be used to simulate vapor compression cycles or other thermodynamic cycles that are not based on absorption processes. An example is the transcritical carbon dioxide refrigeration cycle shown in Fig. 3. In this cycle, carbon dioxide vapor is compressed by a compressor (C) from a low pressure to a high pressure above its critical point. The hot gas then flows through a gas cooler (GC) where it rejects heat to an external fluid at a constant pressure. The cooled gas then expands through an expansion valve (V) to a lower pressure below its critical point. The cold gas then flows through an evaporator (E) where it absorbs heat from an internal fluid at a constant pressure. The vaporized gas then returns to the compressor.


Fig. 3: Transcritical carbon dioxide refrigeration cycle


How to download and install ABSIM




If you want to use ABSIM for your own simulation projects, you need to download and install it on your computer. Here are the steps:


Requirements and compatibility




To run ABSIM on your computer, you need:


  • A Windows operating system (Windows XP or later)



  • A Microsoft Excel application (Excel 2007 or later)



  • A minimum of 512 MB RAM and 100 MB free disk space



  • An internet connection for activation and license renewal



Download link and instructions




To download ABSIM on your computer, you need:


  • To visit https://www.absim.com/download



  • To fill out a registration form with your name, email address, organization name, country, etc.



  • To agree to the terms and conditions of use



  • To click on the download button



  • To save the zip file on your computer



  • To unzip the file using WinZip or any other software



  • To run the setup.exe file inside the unzipped folder



  • To follow the installation wizard instructions



Activation and license




To activate ABSIM on your computer, you need:


  • To launch ABSIM after installation



  • To enter your email address and password that you used for registration



  • To click on activate button



  • To wait for confirmation message



and output results. You can use any of the output parameters as fitness functions, such as COP, energy consumption, heat transfer, etc., or you can define your own fitness function using arithmetic operators and functions. You can also specify whether you want to maximize or minimize the fitness function.


Optimization examples and results




To illustrate how to use the global optimization feature of ABSIM, here are some examples of optimization problems and their results:


Example 1: Optimize the COP of a single-effect water-lithium bromide cycle




In this example, we want to find the optimal values of the heat source temperature (Tg), the heat sink temperature (Tc), and the solution concentration at the generator inlet (Xg) that maximize the COP of a single-effect water-lithium bromide cycle. We use the following settings for the genetic algorithm and the fitness function:


Population size50


Number of generations100


Crossover rate0.8


Mutation rate0.01


Fitness functionCOP


Optimization goalMaximize


Parameter rangesTg: 80-150 CTc: 20-40 CXg: 0.5-0.7 kg/kg


The optimal values and the corresponding COP are:


ParameterOptimal value


Tg150 C


Tc20 C


Xg0.7 kg/kg


COP0.82


Example 2: Optimize the cost of a transcritical carbon dioxide refrigeration cycle




In this example, we want to find the optimal values of the compressor power (Wc), the gas cooler pressure (Pg), and the gas cooler outlet temperature (Tg) that minimize the cost of a transcritical carbon dioxide refrigeration cycle. We assume that the cost is proportional to the compressor power and inversely proportional to the cooling capacity. We use the following settings for the genetic algorithm and the fitness function:


Population size50


Number of generations100


Crossover rate0.8


Mutation rate0.01


Fitness functionWc/Qe (where Qe is the cooling capacity)


Optimization goalMinimize


Parameter rangesWc: 1-10 kWPg: 80-120 barTg: 30-50 C


The optimal values and the corresponding cost are:


ParameterOptimal value


td>Wc1.2 kW


Pg120 bar


Tg30 C


Cost0.12 kW/kW


Conclusion and FAQs




In this article, we have introduced ABSIM, a computer code for simulation of absorption systems in flexible and modular form. We have explained its features, benefits, and applications for different types of absorption systems. We have also shown how to download, install, run, and optimize ABSIM for your own simulation projects. We hope that you have found this article useful and informative.


If you have any questions or comments about ABSIM, please feel free to contact us at info@absim.com or visit our website at https://www.absim.com. We would love to hear from you and help you with your simulation needs.


Here are some FAQs that may answer some of your queries:


Q: What are the advantages of ABSIM over other simulation tools?




A: ABSIM has several advantages over other simulation tools, such as:


  • It is flexible and modular, allowing you to simulate almost any absorption cycle of interest by linking together different units/components and choosing different working fluids.



  • It is user-friendly and easy to use, requiring only minimal input data and providing clear output results.



  • It is reliable and accurate, using a hybrid solver and an automated initial guess selection algorithm to solve the governing equations for the entire cycle simultaneously.



  • It is powerful and effective, using a global optimization feature and a genetic algorithm to find the optimal values of selected parameters that maximize or minimize a user-defined fitness function.



Q: How can I get more information or support for ABSIM?




A: You can get more information or support for ABSIM by:


  • Reading the user's guide that comes with the download link or online at https://www.absim.com/userguide.



  • Accessing the online help files by clicking on the help button or pressing F1 in the user interface.



  • Contacting our technical support team by email at support@absim.com or by phone at +1-800-123-4567.



  • Visiting our website at https://www.absim.com for more resources, news, updates, etc.



Q: How can I purchase or renew a license for ABSIM?




A: You can purchase or renew a license for ABSIM by:


  • Visiting our website at https://www.absim.com/license and choosing from different license options depending on your needs and budget.



  • Filling out a payment form with your credit card or PayPal details.



  • Receiving an email confirmation with your license key and a link to activate or renew your license online.



  • Entering your license key and email address in the activation window in the user interface.



  • Enjoying unlimited use of ABSIM for the duration of your license period.



Q: How can I provide feedback or suggestions for ABSIM?




A: We appreciate your feedback and suggestions for ABSIM as they help us improve our product and service. You can provide feedback or suggestions for ABSIM by:


  • Sending us an email at feedback@absim.com with your comments, ideas, opinions, etc.



  • Filling out a survey form that we may send you occasionally by email after using ABSIM.



  • Rating and reviewing ABSIM on our website or on other platforms where you downloaded it from.



  • Sharing your experience and results with ABSIM on social media or other forums where other users may benefit from it.




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